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This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Features
- Output voltage: 3.3V, 5V, 12V and adjustable output version - Adjustable version output voltage range, 1.23V to 18V+4% - 150KHz +15% fixed switching frequency - Voltage mode non-synchronous PWM control - Thermal-shutdown and current-limit protection - ON /OFF shutdown control input - Operating voltage can be up to 22V - Output load current: 3A - TO220-5L, TO263-5L and PDIP-8 packages - Low power standby mode - Built-in switching transistor on chip
General Description
The AP1506 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 3A load without external transistor. Due to reducing the number of external component, the board space can be saved easily. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control have good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is to prevent over current operating of the output switch. If current limit function occurred and VFB is down to 0.5V below, the switching frequency will be reduced. The AP1506 series operate at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type. The packages are available in a standard 5-lead TO-220, a 5-lead TO-263 or 8-lead PDIP.
Applications
- Simple High-efficiency step-down regulator - On-card switching regulators - Positive to negative converter
Pin Assignments
( Top View ) 5 SD 4 FB 3 GND 2 Output 1 VIN (Top View) VIN Output FB SD 1 2 3 4 8 7 6 5 PDIP-8L 5 SD 4 FB 3 GND 2 Output 1 VIN TO220-5L GND GND GND GND
Pin Descriptions
Pin Name VIN Output GND FB SD Pin # Description TO PDIP 1 1 Operating voltage input 2 2 Switching output 3 5~8 Ground Output voltage feedback 4 3 control 5 4 ON /OFF Shutdown
Metal Tab GND
TO263-5L
( Top View )
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
Rev.1.3 Oct 24, 2005 1/13
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Ordering Information
AP1506 Output version Blank : Adjustable -12 : 12V -33 : 3.3V -50 : 5.0V XX X X X Lead Free Packing
Package
Blank : Tube T5: TO220-5L Blank : Normal K5: TO263-5L L : Lead Free Package A : Taping T5R: TO220-5L(R) N: PDIP-8L
Block Diagram
SD VIN
200mV Current Source bias 1.235V Reference 2.5V Regulator Start up + Comp Comp + + Amp Frequecy compensation 220mV
FB
Comp +
Pre-driver
3A Switch
Anachip Corp. www.anachip.com.tw 2/13
-
Output
150KHz OSC. Thermal Shutdown
GND
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Absolute Maximum Ratings
Symbol VCC VSD VFB VOUT PD TST TOP VOP Parameter Supply Voltage
ON /OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Storage Temperature Operating Temperature Operating Voltage
Rating +24 -0.3 to +18 -0.3 to +18 -1 Internally limited -65 to +150 -40 to +125 +4.5 to +22
Unit V V V V W o C o C V
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version and VIN=18V for the 12V version. ILOAD = 0.5A
Symbol
IFB FOSC FSCP VSAT DC ICL IL IQ ISTBY VIL VIH IH IL JC JA
Parameter
Feedback Bias Current Oscillator Frequency Oscillator Frequency of Short Circuit Protect Saturation Voltage Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Current Limit Output Leakage Output =-1V Current Quiescent Current Standby Quiescent Current Output = 0V
Conditions VFB=1.3V (Adjustable version only)
Min.
Typ.
-10
127 110 When current limit occurred and VFB < 0.5V, Ta=25 oC IOUT=3A No outside circuit VFB=0V force driver on VFB=0V force driver on VFB=12V force driver off Peak current No outside circuit VFB=0 force driver on No outside circuit VFB=12 force driver off VIN=22V VFB=12 force driver off 10
150 30 1.4 100 0
Max. -50 -100 173 173
50 1.6
Unit
nA KHz KHz V %
1.7
5.5 3.6 4.5
6.5
-200
A uA mA mA uA V
-5 5 70 2.0 1.3
ON /OFF pin=5V VIN=22V ON /OFF Pin Logic Input Low (regulator ON) High (regulator OFF) Threshold Voltage ON /OFF Pin Logic Input Current ON /OFF Pin Input Current
10 150 200 0.6 -0.01
VLOGIC=2.5V (OFF) VLOGIC=0.5V (ON) TO220-5L TO263-5L PDIP-8L TO220-5L with copper area TO263-5L of approximately 3 in2 PDIP-8L -0.1 2.5 3.5 12 28 23 35
uA -1
o
Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient
C/W
o
C/W
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25C.
Anachip Corp. www.anachip.com.tw 3/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Electrical Characteristics (Continued)
Symbol
VFB
Parameter
Output Feedback Efficiency Output voltage Efficiency Output voltage Efficiency Output voltage Efficiency
AP1506-ADJ
Conditions 5V < VIN < 22V 0.2A < ILOAD < 3A VOUT programmed for 3V
VIN = 12V, ILOAD=3A 5.5V < VIN < 22V 0.2A < ILOAD < 3A VIN = 12V, ILOAD=3A 8V < VIN < 22V 0.2A < ILOAD < 3A VIN = 12V, ILOAD=3A 15V < VIN < 22V 0.2A < ILOAD < 3A VIN = 16V, ILOAD = 3A
Typ.
1.23 74 3.3 75 5 80 12 89
Limit
1.193/1.18 1.267/1.28
Unit
V VMIN VMAX %
VOUT VOUT VOUT
AP1506-3.3V
3.168/3.135 3.432/3.465
V VMIN VMAX % V VMIN VMAX % V VMIN VMAX %
AP1506-5V
4.8/4.75 5.2/5.25
AP1506-12V
11.52/11.4 12.48/12.6
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25C.
Anachip Corp. www.anachip.com.tw 4/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Typical Performance Characteristics
AP1506 Efficiency v.s. Temperature (Vin=12V,Vout=5V,Io=3A)
83 82 81 80 79 78 77 76 75 74 73 72 -50 -30 -10 10 30 50 70 90 110 130 150
AP1506 Efficiency v.s. Temperature (Vin=12V,Vout=3.3V,Io=3A)
78 77 76
Efficiency (%)
Efficiency (%)
75 74 73 72 71 70 -50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (C)
Temperature (TA) (C)
AP1506 Saturation Voltage v.s. Temperature (Vcc=12V,Vfb=0V,VSD=0)
1.6 1.5
AP1506 Switch Current Limit v.s. Temperature (Vcc=12V,Vfb=0V)
5.5
Saturation Voltage (V)
1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 -50 -25 0 25 1A 0.5A
3A 2A
Switch Current Limit (A)
5 4.5 4 3.5 3 -50 -30 -10 10 30 50 70 90
50
75
100
125
Temperature (TA)(C)
Temperature (TA) (C)
AP1506 Supply Current v.s. Temperature (Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
15 14 13 12 11 10 9 8 7 6 5
60
Supply Current (mA)
Supply Current (uA)
55 50 45 40 35 30 -50 -30 -10 10 30 50 70 90 110 130 150 Switch OFF
Switch ON
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (C)
Temperature (TA) (C)
Anachip Corp. www.anachip.com.tw 5/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Typical Performance Characteristics (Continued)
AP1506 Threshold Voltage v.s. Temperature (Vcc=12V , Io=100mA)
1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 -50 -30 -10 10 30 50 70 90 110 130 150
AP1506 ON/OFF Current v.s. ON/OFF Voltage (Vin=12V)
10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 0 3 6 9 12 15 18 21
Threshold Voltage (V)
Temperature (TA) (C)
ON/OFF Current (nA)
ON/OFF Voltage (V)
AP1506 Frequency v.s. Temperature (Vcc=12V , Io=500mA ,Vout=5V)
170
AP1506 Feedback Current v.s. Temperature (Vcc=12V , Vout=5V,Vfb=1.3V)
10
160 155 150 145 140 -50 -30 -10 10
Feedback Current (nA)
165
0 -10 -20 -30 -40 -50
Frequency (KHz)
Temperature (TA) (C)
30
50
70
90 110 130 150
-50 -30 -10 10
Temperature (TA) (C)
30
50
70
90 110 130 150
AP1506 Output Voltage v.s. Temperature (Vin=12V ,Io=3A)
3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.05 3 2.95 2.9 -40 -20 0
Vout (V)
Temperature (TA) (C)
20
40
60
80 100 120 140 160
Anachip Corp. www.anachip.com.tw 6/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Typical Application Circuit ( TO packages )
(1) Fixed Type Circuit
12V DC Input Vin Cin Capacitor 1 5
FB
4
AP1506 -33 3 SD
2
Output
L1 33uH Inductor D1 Schottky Diode
3.3V/3A Output Load
Gnd
Co Capacitor
(2) Adjustable Type Circuit
R2
FB 12V DC Input Vin Cin Capacitor
4 1
R1
AP1506
5 SD 3
2
Output
L1 47uH
5V/ 3A Output Load
Gnd
D1 Schottky Diode
Co Capacitor
Vout = VFB x (1 + VFB = 1.23V R2 = 1K ~ 3K (3) Delay Start Circuit
R2
R1 R2
)
R1
FB 12V DC Input Vin Cin Capacitor
CDELAY 0.1uF
4 1 5
SD RDELAY 10K
AP1506
2 3
Output
L1 47uH
5V/ 3A Output Load
Gnd
D1 Schottky Diode
Co Capacitor
Anachip Corp. www.anachip.com.tw 7/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Function Description
Pin Functions +VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground Circuit ground. Output Internal switch. The voltage at this pin switches between (+VIN - VSAT) and approximately - 0.5V, with a duty cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept a minimum. Feedback (FB) Senses the regulated output voltage to complete the feedback loop.
are all approximate and there are many factors that can affect these temperatures. Higher ambient temperatures require more heat sinking. The TO-263 surface mount package tab was designed to be soldering to the copper on a printed circuit board. The copper and the board are the heat sink for this package and the other heat producing components, such as the catch diode and inductor. The PC board copper area that the package is soldered to should be at least 0.8 in2, and ideally should have 2 or more square inches of 2 oz. Additional copper area improves the thermal characteristics, but with copper areas greater than approximately 6 in2, only small improvements in heat dissipation are realized. If further thermal improvements are needed, double sided, multi-layer PC board with large copper areas and/or airflow will be recommended. The AP1506 (TO-263 package) junction temperature rises above ambient temperature with a 2A load for various input and output voltages. This data was taken with the circuit operating as a buck-switching regulator with all components mounted on a PC board to simulate the junction temperature under actual operating conditions. This curve can be used for a quick check for the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. When load currents higher than 3A are used, double sided or multi-layer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (Once exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further.
ON /OFF (SD) Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 150uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 18V) shuts the regulator down. If this shutdown
feature is not needed, the ON wired to the ground pin. / OFF pin can be
Thermal Considerations The AP1506 is available in two packages: a 5-pin TO-220 and a 5-pin surface mount TO-263.
The TO-220 package needs a heat sink under most conditions. The size of the heatsink depends on the input voltage, the output voltage, the load current and the ambient temperature. The AP1506 junction temperature rises above ambient temperature for a 3A load and different input and output voltages. The data for these curves was taken with the AP1506 (TO-220 package) operating as a buck-switching regulator in an ambient temperature of 25oC (still air). These temperature rise numbers
Anachip Corp. www.anachip.com.tw 8/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter
Function Description (Continued)
Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.
Marking Information
(1) TO263-5L
( Top view )
(2) TO220-5L
( Top view )
Output Type: 1506: ADJ 1506-33: 3.3V 1506-50: 5.0V 1506-12: 12V
1506-XX YY WW X X
Logo Blank: normal L: Lead Free Package ID code Xth week: 01~52 Year: "01" = 2001 "02" = 2002
Output Type: 1506: ADJ 1506-33: 3.3V 1506-50: 5.0V 1506-12: 12V
1506-XX YY WW X X
Logo Blank: normal L: Lead Free Package ID code Xth week: 01~52 Year: "01" = 2001 "02" = 2002
~
~
(3) PDIP-8L
(Top view)
Output Type: 1506:ADJ 1506-33: 3.3V 1506-50: 5.0V 1506-12: 12V
1506-XX YY WW X X
Logo Blank: normal L: Lead Free Package ID code Xth weed: 01~52 Year: "01"=2001 "02"=2002
~
Anachip Corp. www.anachip.com.tw 9/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Package Information
(1) Package Type: TO220-5L
E
P
A
F
L
D
H1
Q
e
e1
b
C
J1
Symbol
A b C D E e e1 F H1 J1 L Op Q
Dimensions In Millimeters Min. Nom. Max. 4.07 4.45 4.82 0.76 0.89 1.02 0.36 0.50 0.64 14.22 14.86 15.50 9.78 10.16 10.54 1.57 1.71 1.85 6.68 6.81 6.93 1.14 1.27 1.40 5.46 6.16 6.86 2.29 2.74 3.18 13.21 13.97 14.73 3.68 3.81 3.94 2.54 2.73 2.92
Dimensions In Inches Min. Nom. Max.
0.160 0.030 0.014 0.560 0.385 0.062 0.263 0.045 0.215 0.090 0.520 0.145 0.100 0.175 0.035 0.020 0.585 0.400 0.067 0.268 0.050 0.243 0.108 0.550 0.150 0.107 0.190 0.040 0.025 0.610 0.415 0.073 0.273 0.055 0.270 0.125 0.580 0.155 0.115
Anachip Corp. www.anachip.com.tw 10/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Package Information(Continued)
(2) Package Type: TO263-5L
E L2
10.9
9.1
L
1.0 1.7 e B
Land Pattern Recommendation (Unit: mm)
2.5 C L1
Symbol
A B C C2 D E e L L1 L2
Dimensions In Millimeters Min. Nom. Max. 4.07 4.46 4.85 0.66 0.84 1.02 0.36 0.50 0.64 1.14 1.27 1.40 8.65 9.15 9.65 9.78 10.16 10.54 1.57 1.71 1.85 14.61 15.24 15.88 2.29 2.54 2.79 2.92
Dimensions In Inches Min. Nom. Max. 0.160 0.176 0.191 0.026 0.033 0.040 0.014 0.020 0.025 0.045 0.050 0.055 0.341 0.360 0.380 0.385 0.400 0.415 0.062 0.068 0.073 0.575 0.600 0.625 0.090 0.100 0.110 0.115
Anachip Corp. www.anachip.com.tw 11/13
C2
Rev.1.3 Oct 24, 2005
A
15.7
D
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Package Information(Continued)
(3) Package Type: TO220-5L(R) Mechanical drawing
E Q A F
H1
D d1 H2 H3
d2
J1 b e J2 J3
J3 J2 J1 E A
Symbol
A b D d1 d2 E e F H1 H2 H3 J1 J2 J3 Q
Dimensions In Millimeters Min. Nom. Max. 4.4 4.6 4.7 0.7 0.8 0.9 8.4 8.7 8.9 1.0 6.3 9.91 10.16 10.41 1.6 1.7 1.8 1.2 1.25 1.3 6.4 20.8 21.6 22.4 23.9 24.7 25.5 2.7 3.7 4.5 5.3 8.4 2.5 2.8 3.0
Dimensions In Inches Min. Nom. Max. 0.175 0.180 0.185 0.027 0.032 0.037 0.330 0.340 0.350 0.039 0.248 0.390 0.400 0.410 0.062 0.067 0.072 0.048 0.050 0.052 0.250 0.820 0.850 0.880 0.942 0.972 1.002 0.105 0.147 0.177 0.207 0.331 0.100 0.110 0.120
Anachip Corp. www.anachip.com.tw 12/13
Rev.1.3 Oct 24, 2005
This Anachip version datasheet is replaced with Diodes Inc. datasheet AP1506
AP1506
150KHz, 3A PWM Buck DC/DC Converter Package Information(Continued)
(4) Package Type: PDIP-8L
D
E-PIN O0.118 inch
E1
E
15 (4X)
PIN #1 INDENT O0.025 DEEP 0.006-0.008 inch
7 (4X)
C eB
A2
L
A
B S e B1 B2
Symbol
A A1 A2 B B1 B2 C D E E1 e L eB S
Dimensions in millimeters Min. Nom. Max. 5.33 0.38 3.1 3.30 3.5 0.36 0.46 0.56 1.4 1.52 1.65 0.81 0.99 1.14 0.20 0.25 0.36 9.02 9.27 9.53 7.62 7.94 8.26 6.15 6.35 6.55 2.54 2.92 3.3 3.81 8.38 8.89 9.70 0.71 0.84 0.97
A1
Dimensions in inches Min. Nom. Max. 0.210 0.015 0.122 0.130 0.138 0.014 0.018 0.022 0.055 0.060 0.065 0.032 0.039 0.045 0.008 0.010 0.014 0.355 0.365 0.375 0.300 0.313 0.325 0.242 0.250 0.258 0.100 0.115 0.130 0.150 0.330 0.350 0.382 0.028 0.033 0.038
Anachip Corp. www.anachip.com.tw 13/13
Rev.1.3 Oct 24, 2005

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