View BD9575FV_4646562.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Hi-performance Regulator IC Series for PCs
Switching Regulators for DDR-SDRAM Cores
BD9575FV
No.09030EBT11
Description BD9575FV is a switching regulator controller with high output current which can achieve low output voltage (0.7V to 2.0V) from a wide input voltage range (4.5V to 28V). High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power transistor. A new technology called H3RegTM is a Rohm proprietary control method to realize ultra high transient response against load change. SLLM (Simple Light Load Mode) technology is also integrated to improve efficiency in light load mode, providing high efficiency over a wide load range. For protection and ease of use, the soft start function, variable frequency function, short circuit protection function with timer latch, over voltage protection function and REF synchronous function are all built in. This switching regulator is specially designed for the DDR-SDRAM core.
Features 1) H3RegTM Switching Regulator Controller 2) Light Load Mode and Continuous Mode Changeable 3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Over Current Protection (OCP), Over Voltage Protection (OVP), Short Circuit Protection (SCP) built-in 4) Soft start function to minimize rush current during startup 5) Switching Frequency Variable (f=200KHz600KHz) 6) SSOP-B20 Package
Applications Laptop PC, Desktop PC, LCD-TV, Digital Components
Maximum Absolute Ratings (Ta=25) Parameter Input Voltage 1 Input Voltage 2 Input Voltage 3 BOOT Voltage BOOT-SW Voltage HG-SW Voltage LG Voltage REF Voltage Output Voltage ILIM/SCP/SS/FS/SLLM Voltage VREG Voltage EN Input Voltage Power Dissipation 1 Power Dissipation 2 Operating Temperature Range Storage Temperature Range Maximum Junction Temperature Symbol VCC VDD VIN BOOT BOOT-SW HG-SW LG REF VOUT/Is+/IsILIM/SCP/SS/FS/SLLM VREG EN Pd1 Pd2 Topr Tstg Tjmax Limit 71 7
1 1
Unit V V V V V V V V V V V V W W
30 7
35
1
1
71 VDD VCC VCC VCC VCC 71 0.5
2
0.813 -20+100 -55+150 +150
*1 Not to exceed Pd. *2 Reduced by 4mW for each increase in Ta of 1 over 25. IC only. *3 Reduced by 6.5mW for increase in Ta of 1 over 25. (when mounted on a board 70.0mmx70mmx1.6mm Glass-epoxy PCB, 1 layer)
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
1/20
2009.04 - Rev.B
BD9575FV
Operating Conditions (Ta=25) Parameter Input Voltage 1 Input Voltage 2 Input Voltage 3 BOOT Voltage SW Voltage BOOT-SW Voltage SLLM Input Voltage EN Input Voltage Output setting voltage Is Input Voltage MIN ON Time
*This product should not be used in a radioactive environment.
Technical Note
Symbol VCC VDD VIN BOOT SW BOOT-SW SLLM EN REF Is+/IsTonmin
MIN 4.5 4.5 4.5 4.5 -0.7 4.5 0 0 0.7 0.7 -
MAX 5.5 5.5 28 33 28 5.5 5.5 5.5 2.0 2.7 200
Unit V V V V V V V V V V nsec
Electrical characteristics (unless otherwise noted, Ta=25 VCC=5V, VDD=5V, EN/SLLM=5V, VIN=12V, REF=1.8V, RFS=68k) Standard Value Parameter Symbol Unit MIN TYP MAX [Whole Device] VCC Bias Current VIN Bias Current VCC Standby Current VIN Standby Current EN Low Voltage EN HighVoltage EN Bias Current VREG Voltage [Under Voltage Locked Out ] VCC threshold voltage VCC hysteresis voltage VIN threshold voltage VIN hysteresis voltage VREG threshold voltage VREG hysteresis voltage [H Reg ] Frequency ON Time MAX ON Time MIN OFF Time [FET Driver] HG Higher side ON resistor HG Lower side ON resistor LG Higher side ON resistor LG Lower side ON resistor [Dead Time] HG rising LG rising HGdead LGdead 50 50 nsec nsec HGhon HGlon LGhon LGlon 3.0 2.0 2.0 0.5 6.0 4.0 4.0 1.0 Fosc Ton Tonmax Toffmin 400 300 500 3 450 600 550 kHz nsec sec nsec
3 TM
Condition
Icc Iin Iccstb Iinstb Enlow Enhigh Ien Vreg
GND 2.3 2.475
700 100 0 100 7 2.500
900 200 10 200 0.8 5.5 10 2.525
A A A A V V A V Ireg=100A Ta=-10 to 100* VCC:Sweep up VCC:Sweep down VIN:Sweep up VIN:Sweep down VREG:Sweep up VREG:Sweep down EN=0V EN=0V
Vcc_UVLO dVcc_UVLO Vin_UVLO dVin_UVLO Vreg_UVLO dVreg_UVLO
4.1 100 4.1 100 2.0 100
4.3 160 4.3 160 2.2 160
4.5 220 4.5 220 2.4 220
V mV V mV V mV
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
2/20
2009.04 - Rev.B
BD9575FV
Electrical characteristics - Continued (unless otherwise noted, Ta=25 VCC=5V, VDD=5V, EN/SLLM=5V, VIN=12V, REF=1.8V, RFS=68k) Standard Value Parameter Symbol Unit MIN TYP MAX [SCP] SCP Detect Voltage SCP threshold voltage Charge current Standby voltage [OVP] OVP Detect Voltage [Soft start] Charge current Standby voltage [Over Current Protection Block] Current limit threshold1 Current limit threshold2 Reverse current limit threshold1 Reverse current limit threshold2 [VOUT setting ] VOUT offset voltage1 VOUT bias current REF bias current Is+ Input current Is- Input current [SLLM ] Continuous mode threshold SLLM threshold
* Design Guarantee
Technical Note
Condition
Vscp Vscpth Iscp Vscp_stb VOVP Iss Vss_stb
REFx0.65 1.2 1.5 REFx1.16 1.5 -
REFx0.7 1.25 2 REFx1.2 2 -
REFx0.75 1.3 2.5 50 REFx1.24 2.5 50
V V A mV V A mV ILIM=0.5V Ta=-20 to 100* ILIM=2.0V ILIM=0.5V ILIM=2.0V Ta=-20 to 100*
Ilim1 Ilim2 ReIlim1 ReIlim2 Voutoff1 Ivout Iref IIs+ IIsVthcon VthSLLM
43 160 REF-7m -100 -100 -1 -1 VCC-0.5 GND
50 200 -50 -200 REF 0 0 0 0 -
57 240 REF+7m 100 100 1 1 VCC 0.5
mV mV mV mV V nA nA A A V V
Is+=1.8V Is-=1.8V
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
3/20
2009.04 - Rev.B
BD9575FV
Reference Data
600 590 580
VREG[V] 2.500 2.498 2.496 2.494 2.492 2.490 -10 10 30 50 Ta [] 70 90
Technical Note
4.30 4.25 4.20 VCC[V] 4.15 4.10 4.05 4.00 -10 10 30 50 Ta [] 70 90
Sweep up
Icc[uA]
570 560 550 -10 10 30 50 Ta [] 70 90
Sweep down
Fig.1 Ta vs Icc
4.30 4.25 2.20 2.15 2.10 VREG[V] 2.05 2.00
Fig.2 Ta vs VREG
1.7 1.6
Fig.3 Ta vs UVLO (VCC)
Sweep up
4.20 VIN[V] 4.15 4.10
Sweep up
EN[V]
Sweep up
1.5 1.4 1.3 1.2
Sweep down
4.05 4.00 -10 10 30 50 Ta () 70 90
Sweep down
1.95 1.90 -10 10 30 50 Ta () 70 90
Sweep down
-10
10
30
50 Ta []
70
90
Fig.4 Ta vs UVLO (VIN)
Fig.5 Ta vs UVLO (VREG)
Fig.6 Ta vs EN Threshold
2.8 2.4 2.0
TON [nsec]
1000 900 800 700 600 500 400 300 200 100 0
600 500 400 300 200 100 0
0.6 0.8 1 1.2 1.4 1.6 1.8 2
1.6 1.2 0.8 0.4 0.0 0 1.5 3 4.5 Vcc [V] 6
Right: -10 Middle: 25 Left: 100
Top: -10 Middle: 25 Bottom: 100
TON [nsec]
VREG[V]
Top: -10 Middle: 25 Bottom: 100
0.6 0.8 1 1.2 1.4 1.6 1.8 2
REF [V]
REF [V]
Fig.7 VCC vs VREG (Start up)
Fig.8 REF vs ON TIME (VIN=7V)
Fig.9 REF vs ON TIME (VIN=12V)
400 350 300 TON [nsec]
1200 1000
3 2
200 150 100 50 0 0.6 0.8 1 1.2
Top: -10 Middle: 25 Bottom: 100
TON [nsec]
250
600 400 200 0
Top: -10 Middle: 25 Bottom: 100
VOUT-REF [mV]
25
800
1 0 -1 -2 -3
1.4
1.6
1.8
2
5
10
15 VIN [V]
20
-10
10
30
50
70
90
Fig.10 REF-ON TIME (VIN=25V)
REF [V]
Fig.11 VIN-ON TIME (REF=1.8V)
Fig.12 Ta vs VOUT offset
Ta []
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
4/20
2009.04 - Rev.B
BD9575FV
Reference Data - Continued
54
350
Technical Note
400 52
frequency[kHz] 330
360 frequency[kHz]
310 290 270
Io=2A
Is [mV]
50
320 280 240
Io=0A
48
ILIM=0.5V
46 -10 10 30 50 Te [] 70 90
250 -10 10 30 50 Ta() 70 90
200 0 5 10 15 VIN(V) 20 25
Fig.13 Ta vs current limit threshould
100
100
Fig.14 Ta vs Frequency
100
Fig.15 VIN vs Frequency
SLLM
80
SLLM
80
80
SLLM
[%]
[%]
[%]
60
Continuous mode
60
60
40
40
Continuous mode
40
Continuous mode
20
20
20
0 1 10 100 Io(mA) 1000 10000
0 1 10 100 Io(mA) 1000 10000
0 1 10 100 Io(mA) 1000 10000
Fig.16 Io vs Efficiency (VIN=7V)
Fig.17 Io vs Efficiency (VIN=12V)
Fig.18 Io vs Efficiency (VIN=20V)
VOUT
VOUT HG/LG
VOUT HG/LG
HG/LG
IOUT
IOUT
IOUT
Fig.19 Load Transient Response (VIN=7V)
Fig.20 Load Transient Response (VIN=12V)
Fig.21 Load Transient Response (VIN=19V)
VOUT
VOUT HG/LG
VOUT HG/LG
HG/LG
IOUT
IOUT
IOUT
Fig.22 Load Transient Response (VIN=7V)
Fig.23 Load Transient Response (VIN=12V)
Fig.24 Load Transient Response (VIN=19V)
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
5/20
2009.04 - Rev.B
BD9575FV
Reference Data - Continued
VOUT VOUT IL IL HG/LG HG/LG
Technical Note
VOUT IL HG/LG
Fig.25 SLLM (IOUT=0A)
Fig.26 SLLM (IOUT=0.4A)
Fig.27 SLLM (IOUT=1A)
IL
IL
IL
HG/LG/SW
HG/LG/SW
HG/LG/SW
Fig.28 Continuous MODE (Io=0A)
Fig.29 Continuous MODE (Io=4A)
Fig.30 Continuous MODE (Io=5A)
VIN
VIN EN
HG/LG
HG/LG SS
VOUT
VOUT
VOUT
Fig.31 VIN change (519V)
1.82
400 350
Fig.32 VIN change (195V)
700
Fig.33 FS VIN wake up
Continuous mode
Frequency [kHz]
600
1.81 VOUT [V]
Frequency [kHz]
Continuous mode
300 250 200 150 100 50
500
From upper side VIN=5V 7V 12V 16V 19V
1.8
400
1.79
SLLM
SLLM
300
200
1.78 1 10 100 Iout [mA] 1000 10000
0 1 10 100 Iout [mA] 1000 10000
100 30 40 50 60 70 80 90 100 110 120 130
RFS [k]
Fig.34 IOUT-VOUT
Fig.35 IOUT-Frequency
Fig.36 FS resistance- Frequency
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
6/20
2009.04 - Rev.B
BD9575FV
Block Diagram
Technical Note
5 VCC
8
VIN
2
VREG
19
SS
VDD EN
7
Reference Block
VREG VIN
UVLO
SS
2.5VReg
2.5V Soft Start Block BOOT18 VIN HG
17
SCP10 REF 3
REFx0.7 SSx0.7 VOUT
SCP
SCP
REFx1.2 VOUT
OVP
VOUT
SW
H Reg
3
TM
R S
Q
SLLM
Driver Circuit
VDD LG
16
Controller Block
VOUT
1
15 14 13
SLLM Current Limit ILIM
SS
+ +
TSD UVLO ILIM SCP TSD
20
+
PGND EN/UVLO
12 11
Thermal Protection 4
GND
9 FS SLLM
ILIM
6
Is+
Is-
PHYSICAL DIMENSIONS
SSOP-B20 (Unit :mm)
Pin NumberPin Name PinNo. 1 2 3 4 5 6 7 8 9 10 11 Pin Name VOUT VREG REF GND VCC ILIM EN VIN SLLM SCP ISPinNo. Pin Name 12 IS+ 13 PGND 14 LG 15 VDD 16 SW 17 HG 18 BOOT 19 SS 20 FS FIN *Please short FIN to the 1PIN
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
7/20
2009.04 - Rev.B
BD9575FV
Technical Note
Pin Descriptions VOUT (1pin) This is the output voltage sense pin. It is also possible to adjust the output voltage using external resistor divider based on the equation, REFVOUT. VREG (2pin) This is the reference voltage output pin. The voltage is 2.5V, with 100A current ability. It is recommended that a 1F capacitor (X5R or X7R) be established between VREG and GND. When REF is not adjusted from the external voltage supply, the REF voltage can be adjusted using the external resistor divider of VREF. REF (3pin) This is the output voltage adjustment pin. It is very convenient for synchronizing external voltage supply. The IC controls the output voltage (REFVOUT). GND (4pin) This is the ground pin for IC internal circuits. It is equivalent to FIN voltage. VCC (5pin) This is the power supply pin for IC internal circuits, except the FET driver. The maximum circuit current is 900A. The input supply voltage range is 4.5V to 5.5V. It is recommended that a 0.1F bypass capacitor be put in this pin. ILIM (6pin) BD9575FV detects the voltage between Is+ pin and Is- pin and limits the output current (OCP). Voltage equivalent to 1/10 of the ILIM voltage is the voltage drop of external current sense resistor. A very low current sense resistor or inductor DCR can also be used for this platform. EN (7pin) When EN pin voltage is at least 2.3V, the status of this switching regulator becomes active. Conversely, the status switches off when EN pin voltage goes lower than 0.8V and circuit current becomes 10A. VIN (8pin) The duty cycle is determined by input voltage and output voltage. In other words, the output voltage is affected by input voltage. Therefore, when VIN voltage fluctuates, the output voltage becomes also unstable. Since the VIN line is also the input voltage of the switching regulator, stability depends on the impedance of the voltage supply. It is recommended to establish a bypass capacitor or CR filter suitable for the actual application. SLLM (9pin) This is the switch shift pin for Simple Light Load Mode. The efficiency in SLLM is improved when SLLM pin voltage goes lower than 0.5V. SCP (10pin) This is the pin to adjust the timer latch time for short circuit protection. The timer circuit is active when the pin voltage becomes 70% of REF, and the output switches OFF and latched after the specified time. When the UVLO circuit is active or EN is low, this latch function is cancelled. Is- (11pin) ,Is+(12pin) These pins are connected to both sides of the current sense resistor to detect output current. The voltage drop between Is+ and Is- is compared with the voltage equivalent to 1/10 of ILIM voltage. When this voltage drop reaches the specified voltage level, the output voltage goes OFF. PGND (13pin) This is the power ground pin connected to the source of the low side FET. LG (14pin) This is the voltage supply to drive the Gate of the low side FET. This voltage swings between VDD and PGND. High-speed Gate driving for the low side FET is achieved due to the low on-resistance (2 when LG is high, 0.5 when LG is low) of the driver. VDD (15pin) This is the power supply pin to drive the LOW side FET. It is recommended that a 1uF bypass capacitor be established to compensate for rush current during the FET ON/OFF transition. SW (16pin) This is the source pin for the high side FET. The maximum absolute ratings are 30V (from GND). SW voltage swings between VIN and GND. HG (17pin) This is the voltage supply to drive the Gate of the high side FET. This voltage swings between BOOT and SW. High-speed Gate driving for the high side FET is achieved due to the low on-resistance (3 when HG is high, 2 when HG is low) of the driver. BOOT (18pin) This is the voltage supply to drive the high side FET. The maximum absolute ratings are 35V (from GND) and 7V (from SW). BOOT voltage swings between VIN+Vcc and Vcc during active operation. SS (19pin) This is the adjustment pin to set the soft start time. SS voltage is low during standby status. When EN is ON, the soft start time can be determined by the SS charge current and capacitor between SS-GND. Until SS reaches REF voltage, the output voltage is equivalent to SS voltage. FS (20pin) This is the pin to adjust the switching frequency based on the resistor value. The frequency range is f=200KHz - 600KHz.
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
8/20
2009.04 - Rev.B
BD9575FV
Technical Note
Explanation of Operation The BD9575FV is a synchronous buck regulator controller incorporating ROHM's proprietary H3RegTM CONTROLLA control system. When VOUT drops due to a rapid load change, the system quickly restores VOUT by extending the TON time interval. Thus, it serves to improve the regulator's transient response. Activating the Light Load Mode will also exercise Simple Light Load Mode (SLLM) control when the load is light, to further increase efficiency.
3 TM H Reg control (Normal operation)
VOUT REF
When VOUT falls to a threshold voltage (REF), the drop is 3 TM detected, activating the H Reg CONTROLLA system. REF 1 [sec](1) x VIN f HG output is determined with the formula above. LG outputs until the status of VOUT is lower than REF after the status of HG is off. TON=
HG
LG
(VOUT drops due to a rapid load change) VOUT REF When VOUT drops due to a rapid load change, and the voltage remains below REF after the programmed TON time interval has elapsed, the system quickly restores VOUT by extending the TON time, improving the transient response. TON+
Io HG
LG
(SLLM ) VOUT REF In SLLM (SLLM=0V), SLLM function is operated when LG pin is OFF and the coil current is lower than 0A (the current goes from VOUT to SW). And it stops to output next HG. When VOUT goes lower than REF voltage again, the status of HG is ON.
HG
LG
0A
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
9/20
2009.04 - Rev.B
BD9575FV
Timing Chart Soft Start Function
Technical Note
EN TSS SS
Soft start is exercised with the EN pin set high. Current control takes effect at startup, enabling a moderate output voltage "ramping start." Soft start timing and incoming current are calculated with formulas (2) and (3) below. Soft start time Tss= REFxCss [sec] (2) 2A(typ)
VOUT Incoming current IIN (3) CoxVOUT [A] IIN= Tss (Css: Soft start capacitor; Co: Output capacitor)
Timer Latch Type Short Circuit Protection
REFx0.7
VOUT TSCP
SCP
Short protection kicks in when output falls to or below REF X 0.7. When the programmed time period elapses, output is latched OFF to prevent destruction of the IC. Output voltage can be restored either by reconnecting the EN pin or disabling UVLO. Short circuit protection time is programmed using formula (4) below. Short protection time setting
EN/UVLO
Tscp=
1.25(V)xCSCP 2A(typ)
[sec] (4)
Over Voltage Protection
VOUT
REFx1.2
HG
LG Switching
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
10/20
2009.04 - Rev.B
BD9575FV
External Component Selection 1. Inductor (L) selection
Technical Note
The inductor value is a major influence on the output ripple current. As formula (5) below indicates, the greater the inductor or the switching frequency, the lower the ripple current.
IL
VIN
IL VOUT L Co
(VIN-VOUT)xVOUT [A](5) IL= ILxVINxf The proper output ripple current setting is about 30% of maximum output current. IL=0.3xIOUTmax. [A](6) (VIN-VOUT)xVOUT L= [H](7) ILxVINxf (IL: output ripple current; f: switch frequency)
Output ripple current Passing a current larger than the inductor's rated current will cause magnetic saturation in the inductor and decrease system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed the inductor rated current value. To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance. 2.Output Capacitor (CO) Selection
VIN
When determining the proper output capacitor, be sure to factor in the equivalent series resistance required to smooth out ripple volume and maintain a stable output voltage range. Output ripple voltage is determined as in formula (8) below.
VOUT L ESR ESL Co
VOUT=ILxESR+ESLxIL/TON [V](8) (IL: Output ripple current; ESR: CO equivalent series resistance, ESR:equivalent series inductance) In selecting a capacitor, make sure the capacitor rating allows sufficient margin relative to output voltage. Note that a lower ESR can minimize output ripple voltage.
Output capacitor
Please give due consideration to the conditions in formula (9) below for output capacity, bearing in mind that output rise time must be established within the soft start time frame. Co Tssx(Limit-IOUT) (9) VOUT Tss: Soft start time Limit: Over current detection
Note: Improper capacitor may cause startup malfunctions. 3. Input Capacitor (Cin) Selection
VIN Cin
The input capacitor selected must have low enough ESR resistance to fully support large ripple output, in order to prevent extreme over current. The formula for ripple current IRMS is given in (10) below.
VOUT
L
Co
VOUT(VIN-VOUT) [A](10) VIN IOUT Where VCC=2xVOUT, IRMS= 2 IRMS=IOUTx
Input Capacitor A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency.
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
11/20
2009.04 - Rev.B
BD9575FV
4. MOSFET Selection Loss on the main MOSFET
VIN main switch
Technical Note
Pmain=PRON+PGATE+PTRAN =
VOUT L Co
VOUT VIN
xRONxIOUT2+CissxfxVDD+
VIN2xCrssxIOUTxf IDRIVE
(11)
(Ron: On-resistance of FET; Ciss: FET gate capacity; f: Switching frequency Crss: FET inverse transfer function; IDRIVE: Gate peak current) Loss on the synchronous MOSFET Psyn=PRON+PGATE VIN-VOUT xRONxIOUT2+CissxfxVDD (12) VIN
synchronous switch
=
5. Setting Detection Resistance
VIN
The over current protection function detects the output ripple current peak value. This parameter (setting value) is determined as in formula (13) below.
L R VOUT
IL Co
ILMIT=
VILIMx0.1 [A](13)
R (VILIM: ILIM voltage; R: Detection resistance)
Current limit
VIN IL L RL VOUT Co
When the over current protection is detected by DCR of coil L, this parameter (setting value) is determined as in formula (14) below. (Application circuit:P20) rxC L
ILMIT=VILIMx0.1x (RL= L rxC )
[A](14)
r
C
(VILIM:ILIM voltage
Current limit
RL: the DCR value of coil)
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
12/20
2009.04 - Rev.B
BD9575FV
6.Setting frequency
3000 2500 2000 TON [nsec] 1500 1000
Technical Note
VIN=5V 7V 12V 16V 19V
On Time (TON) at steady state is determined by resistance value connected to FS pin as shown in the figure. The frequency can be calculated with TON, input voltage VIN, the reference voltage REF as follows. F=
REF=1.8V
REF VINxTON (15)
500 0 0 50 100 RFS [k] 150 200
Calculated frequency using TON above
1200 1000 800 600 400 200 0 0 50 100 Resistance [k] 150 200
7. Setting standard voltage (REF) VIN It is available to synchronize setting the reference voltage (REF) with outside supply voltage [V] by using outside power supply voltage.
Frequency [kHz]
VIN=5V 7V 12V 16V 19V
However, the actual frequency becomes lower than the formula due to expanded TON time caused by the rise/fall time of the MOSFET (This rise/fall time is affected by the switching speed). TON is also influenced by Dead Time under light load in continuous mode. In this case the frequency becomes lower than setting frequency. The setting frequency noted above is under heavy load (when the inductor current does not go back to VIN through the body diodes of the external MOSFET's).
REF
Outside voltage
H3RegTM CONTROLLA
R S
Q
VOUT
VREG R1 REF R2
VIN
It is available to set the reference voltage (REF) by the resistance division value from VREG in case it is not set REF from an external power supply. R S Q REF= R2 R1+R2 xVREG [V](16)
H3RegTM CONTROLLA
VOUT
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
13/20
2009.04 - Rev.B
BD9575FV
Technical Note
8. Setting output voltage This IC is operated that output voltage is REFVOUT. And it is operated that output voltage is feed back to FB pin in case the output voltage is 0.7V to 2.0V.
VIN
VIN
REF
H3RegTM CONTROLLA
R S
Q
SLLM Driver SLLM Circuit
Output voltage
VOUT
In case the output voltage range is 0.7V to 2.0V.
It is operated that the resistance division value of the output voltage is feed back to VOUT pin in case the output voltage is more than 2.0V. output voltage R1+R2 xREF [V](17) R2
VIN
VIN
REF
H3RegTM CONTROLLA
R S
Q
SLLM Driver SLLM Circuit R1
Output voltage
VOUT
R2 In case the output voltage is more than 2.0V.
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
14/20
2009.04 - Rev.B
BD9575FV
I/O Equivalent Circuit 6pin (ILIM)
VCC
Technical Note
7pin (EN)
8pin (VIN)
9pin (SLLM)
10pin (SCP)
VCC
11pin (Is-)
VCC
VCC
12pin (Is+)
VCC
14pin (LG)
VCC VDD
16pin (SW)
BOOT HG
17pin (HG)
BOOT BOOT
18pin (BOOT)
19pin (SS)
VCC
HG
SW
20pin (FS)
VCC
1pin (VOUT)
VCC
2pin (VREG)
VCC
3pin (REF)
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
15/20
2009.04 - Rev.B
BD9575FV
Evaluation Board Circuit (Frequency=300kHz application circuit in Continuous mode/SLLM)
Technical Note
4.5V25V VIN VCC 5V R2
R16
VCC EN R18 SLLM R19 VREG 2.5V R14 R12
8 7
BD9575FV U1
VIN EN BOOT VDD
15 D1
PGND C15
2
VREG
HG SW
17 16
R10
C8
9
SLLM
PGND Q1 PGND PGND L1 R7 1.8V/10A VOUT
ILIM 0.5V REF 1.8V R1 3 20 10 R9 19 5 C12 C11 C2 C1 4 REF FS 6 ILIM
R21
R22
R23
C13
C14
R15
R13
R24
PGND
13 R4 12 C16 R3 PGND
D2
C3
PGND PGND PGND R25
SCP SS VCC GND
Is+
R17
R20
Is- 11 1
R5 VOUT
GND
Evaluation Board Parts List Part No Value Company U1 ROHM Q1 ROHM Q2 ROHM D1 ROHM D2 ROHM C1 1F KYOCERA C2 1F KYOCERA C3 100pF MURATA C4 C5 C6 10F KYOCERA C7 C8 0.1F KYOCERA C9 10F KYOCERA C10 10F KYOCERA C11 1000pF MURATA C12 1500pF MURATA C13 1F KYOCERA C14 C15 10F KYOCERA C16 C17 470F SANYO R1 68K ROHM R2 0 ROHM R3 0 ROHM
Part name BD9575FV RSS100N03 RSS100N03 RB521S-30 RB051L-40 CM105B105K06A CM105B105K16A GRM39C0G101J50
CM21B106K06 CM05B104K25A CM316B106M16A CM316B106M16A GRM39X7R102K50 GRM39X7R152K50 CM105B105K06A CM21B106M06A 2R5TPE470ML MCR03 MCR03 MCR03
Part No R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 L1
Value 0 5m 0 0 0 0 200k 51k 68k 180k 10 0 10k 10k 0
Company ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM
Part name MCR03 PMR100 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03
0 0 0 1.8H
ROHM ROHM ROHM SUMIDA
MCR03 MCR03 MCR03 CDEP104-1R8ML
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
16/20
2009.04 - Rev.B
R26
C4
C5
R6
C17
LG 14
R8
Q2
C10
C9
18
R11
C6
BD9575FV
Evaluation Board Circuit (Frequency=300kHz application circuit for detecting DCR current in Continuous mode/SLLM)
4.5V25V VIN VCC 5V R2
Technical Note
16
VCC EN R18 SLLM R19 VREG
8 7
BD95775FV U1
VIN EN
VDD
15 D1
PGND C15
BOOT 9 SLLM HG SW 6 ILIM
2 R14 R12 ILIM
17 16
R10
C8
PGND Q1 PGND PGND VOUT L1
VREG
D2
REF 3 R1 C13 C14 R15 R13 C3 20 10 R9 19 5 C12 C11 C2 C1 4 REF FS PGND
C7 R21 R22 R23 R24
13 R4 12 11 C16 R3 PGND
PGND PGND PGND R25
SCP SS VCC GND
Is+ Is-
R17
R20
R5 VOUT 1
GND
Evaluation Board Parts List Part No Value Company U1 ROHM Q1 ROHM Q2 ROHM D1 ROHM D2 ROHM C1 1F KYOCERA C2 1F KYOCERA C3 100pF MURATA C4 C5 C6 10F KYOCERA C7 0.1F KYOCERA C8 0.1F KYOCERA C9 10F KYOCERA C10 10F KYOCERA C11 1000pF MURATA C12 1500pF MURATA C13 1F KYOCERA C14 C15 10F KYOCERA C16 C17 330F SANYO R1 68K ROHM R2 0 ROHM R3 0 ROHM
Part name BD9575FV RSS100N03 RSS100N03 RB521S-30 RB051L-40 CM105B105K06A CM105B105K16A GRM39C0G101J50
CM21B106K06 CM05B104K25A CM05B104K25A CM316B106M16A CM316B106M16A GRM39X7R102K50 GRM39X7R152K50 CM105B105K06A CM21B106M06A 6TPB330M MCR03 MCR03 MCR03
Part No R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 L1
Value 0 1k 0 0 0 0 51k 200k 68k 180k 10 0 10k 10k 0 0 0
Company ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM
Part name MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03
0 3.3H
ROHM NEC/TOKIN
MCR03 MPLC0730L3R3
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
17/20
2009.04 - Rev.B
R26
C4
C5
R6
C17
LG 14
R8
Q2
C10
C9
18
R11
C6
BD9575FV
Technical Note
Notes for use 1. Absolute maximum ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2. Connecting the power supply connector backward Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply lines. An external direction diode can be added. 3. Power supply lines Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise ground and supply line, separate the ground section and supply lines of the digital and analog blocks. Furthermore, for all power supply terminals to ICs, connect a capacitor between the power supply and the GND terminal. When applying electrolytic capacitors in the circuit, not that capacitance characteristic values are reduced at low temperatures. 4. GND voltage The potential of GND pin must be minimum potential in all operating conditions. 5. Thermal design Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. 6. Inter-pin shorts and mounting errors Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection error or if pins are shorted together. 7. Actions in strong electromagnetic field Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to malfunction. 8. ASO When using the IC, set the output transistor so that it does not exceed absolute maximum ratings or ASO. 9. Thermal shutdown circuit The IC incorporates a built-in thermal shutdown circuit (TSD circuit). The thermal shutdown circuit (TSD circuit) is designed only to shut the IC off to prevent thermal runaway. It is not designed to protect the IC or guarantee its operation. Do not continue to use the IC after operating this circuit or use the IC in an environment where the operation of this circuit is assumed. TSD on temperature [] (typ.) BD9575FV 175 Hysteresis temperature [] (typ.) 15
10. Testing on application boards When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress. Always discharge capacitors after each process or step. Always turn the IC's power supply off before connecting it to or removing it from a jig or fixture during the inspection process. Ground the IC during assembly steps as an antistatic measure. Use similar precaution when transporting or storing the IC.
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
18/20
2009.04 - Rev.B
BD9575FV
Technical Note
11. Regarding input pin of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N junctions are formed at the intersection of these P layers with the N layers of other elements, creating a parasitic diode or transistor. For example, the relation between each potential is as follows: When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode. When GND > Pin B, the P-N junction operates as a parasitic transistor. Parasitic diodes can occur inevitable in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. Accordingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input pin, should not be used.
Resistor Pin A Pin A
P+ N P P+ N N
Transistor (NPN) Pin B
C B E B P P+ N C E
Pin B
N
Parasitic element
P+
N
P substrate Parasitic element
GND
P substrate Parasitic element
GND GND GND
Parasitic element
Other adjacent elements
Example of IC structure 12. Ground Wiring Pattern When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns, placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change the GND wiring pattern of any external components, either.
Thermal Derating Curve SSOP-B20
[mW] 1 Power Dissipation [Pd]
IC only ja=250/W 1 layer board
(70mmx70mmx1.6mm70.0mmx70mmx1.6mm Glass-epoxy PCB).
ja=153.8/W
0.5
0 0 25 50 75 100 125 150 [] Ambient Temperature [Ta]
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
19/20
2009.04 - Rev.B
BD9575FV
Ordering part number
Technical Note
B
D
9
Part No.
5
7
5
F
V
-
E
2
Part No.
Package FV : SSOP-B20
Packaging and forming specification E2: Embossed tape and reel
SSOP-B20
6.5 0.2
20 11

Tape Quantity
0.3Min.
Embossed carrier tape 2500pcs E2
The direction is the 1pin of product is at the upper left when you hold
6.4 0.3
4.4 0.2
Direction of feed
( reel on the left hand and you pull out the tape on the right hand
)
1
10
0.15 0.1
1.15 0.1
0.1 0.1
0.1 0.65 0.22 0.1
1pin
(Unit : mm)
Direction of feed
Reel
Order quantity needs to be multiple of the minimum quantity.
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
20/20
2009.04 - Rev.B
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us.
ROHM Customer Support System
http://www.rohm.com/contact/
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
R0039A

▲Up To Search▲

Price & Availability of BD9575FV

	To Download BD9575FV Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .