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1-1-2 Switching Mode Regulator ICs
SI-8000GL Series
Features
Compact, Separate Excitation Step-down Switching Mode Regulator ICs
Absolute Maximum Ratings
Parameter DC Input Voltage Power Dissipation Junction Temperature Storage Temperature Thermal Resistance (junction to case) Thermal Resistance (junction to ambient air) Symbol VIN PD*1 Tj Tstg Ratings 53 1 +125 -40 to +125 28 100 Unit V W C C C/W C/W
* DIP 8 pin package * Output current: 1.5A * High efficiency: 86% (at VIN = 20V, lO = 1A, VO = 5V) * Capable of downsize a choke-coil due to IC's high switching frequency (250kHz). (Compared with conventional Sanken devices) * The output-voltage-variable type can vary its output voltage from 1V to 14V because of its low reference voltage (Vref) of 1V. * Wide Input Voltage Range (8 to 50V) * Output ON/OFF available * Built-in overcurrent protection and thermal protection circuits
j-c j-a
*1: Limited by thermal protection.
Applications
* Onboard local power supplies * OA equipment * For stabilization of the secondary-side output voltage of switching power supplies
Recommended Operating Conditions
Ratings Parameter DC Input Voltage Range Output Voltage Range Output Current Range Operating Junction Temperature Range Operating Temperature Range Symbol VIN VO IO Tjop Top SI-8010GL (8 or VO+3)*1 to 50 1 to 14 0.02 to 1.5 -30 to +125 -30 to +125
*1: The minimum value of an input voltage range is the higher of either 8V or VO+3V.
Electrical Characteristics
Ratings Parameter Symbol min. Reference Voltage Efficiency Oscillation Frequency Line Regulation Load Regulation Temperature Coefficient of Reference Voltage Overcurrent Protection Starting Current Quiescent Circuit Current Circuit Current at Output OFF CE/SS* Terminal Low Level Voltage Terminal Outflow Current at Low Voltage VREF Conditions Eff Conditions FOSC Conditions VOLINE Conditions VOLOAD Conditions VREF/Ta IS Conditions Iq Conditions Iq(OFF) Conditions VSSL ISSL Conditions VSSL=0V VIN=12V, VON/OFF=0.3V 0.5 50 1.6 VIN=12V 7 VIN=12V, IO=0A 400 0.97 SI-8010GL (Variable type) typ. 1.00 VIN=12V, IO=1A 86 VIN=20V, IO=1A, VO=5V 250 VIN=12V, IO=1A 20 VIN=10 to 30V, IO=1A 10 VIN=12V, IO=0.1 to 1.5A 0.5 30 40 max. 1.03
(Ta=25C) Unit
V % kHZ mV mV mV/C
A mA
A
V
A
*: Pin 2 is the CE/SS pin. Soft start at power on can be performed with a capacitor connected to this pin.The output can also be turned ON/OFF with this pin. The output is stopped by setting the voltage of this pin to VSSL or lower. CE/SS-pin voltage can be changed with an open-collector drive circuit of a transistor. When using both the soft-start and ON/OFF functions together, the discharge current from C4 flows into the ON/OFF control transistor. Therefore, limit the current securely to protect the transistor if C3 capacitance is large. The CE/SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited.
SI-8000GL
SI-8000GL
SI-8000GL
2 CE/SS
2 CE/SS C4
2 CE/SS C4
VO. ON/OFF
Soft start
Soft start +VO. ON/OFF
68
ICs
SI-8000GL Series
External Dimensions (DIP8)
6.50.2
(Unit: mm)
8 a
7
6 8010GL b c
5
SK
1
2
3
4
9.40.3
4.20.3
1.0+0.3 -0.05 1.5+0.3 -0.05
7.50.5
7.6
Pin Assignment 1. GND 2. CE/SS 3. Reg 4. SWOUT 5. VIN 6. B.S 7. Comp 8. VREF Plastic Mold Package Type Flammability: UL 94V-0 Product Mass: Approx. 0.49 g
3.40.1
+0.1 0.25-0.05
0.50.1 2.54 0.89 TYP
3.30.2
0.25 M 015
Block Diagram
SI-8010GL
Ta-PD Characteristics
2 1.8
PD=VO * IO
Power Dissipation PD (W)
VIN
100 VO -1 -VF * IO 1- VIN
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2
j-a:100C/W
UVLO CE/SS CE/SS
P.REG
OCP BS
Boot REG TSD
DRIVE Reg OSC
+ -
PWM LOGIC
SWOUT
Note 1: The efficiency depends on the input voltage and the output current. Therefore, obtain the value from the efficiency graph and substitute the percentage in the formula above. Note 2: Thermal design for D1 must be considered separately.
25 50 75 100 125
VREF Comp
Amp +
0 -25
0
Ambient Temperature Ta (C)
1V
GND
VO : Output voltage VIN : Input voltage IO : Output current : Efficiency VF : Diode D1 forward voltage RK16***0.4V(IO=1A)
Typical Connection Diagram
SI-8010GL
6
B.S
5
R1 L1 C3
VIN
2 C1
VIN CE/SS
C7
SI-8010GL
Comp
7 C5 C6
SWOUT
4 D1 R2
V0
+
Reg
3 C4
GND
1
VREF
+
C2 C8 IREF
8 R3
C1: 220F/63V C2: 470F/25V C3: 0.1F C4: 1000pF C5: 0.1F C6: 0.047F C7: 0.1F R2=
C8: 0.1F R1: 47 L1: 47H D1: RK16 (Sanken)
GND
GND
Diode D1 * Be sure to use a Schottky-barrier diode as D1. If other diodes like fast recovery diodes are used, IC may be destroyed because of the reverse voltage generated by the recovery voltage or ON voltage. Choke coil L1 * If the winding resistance of the choke coil is too high, the efficiency may drop below the rated value. * As the overcurrent protection starting current is approx. 2.5 A, take care concerning heat radiation from the choke coil caused by magnetic saturation due to overload or short-circuited load. Capacitor C1, C2 * As large ripple currents flow through C1 and C2, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use. Especially when the impedance of C2 is high, the switching waveform may become abnormal at low temperatures. For C2, do not use a capacitor with an extremely low equivalent series resistance (ESR) such as an OS capacitor or a tantalum capacitor, which may cause an abnormal oscillation. Resistors R2, R3 * R2 and R3 are the resistors to set the output voltage. Set their values so that IREF becomes approx. 2 mA. Obtain R2 and R3 values by the following formula above. * To create the optimum operating conditions, place the components as close as possible to each other.
(VOUT-VREF) (VOUT-1) 1 VREF . = 500() = = (), R3 = . IREF 2x10-3 IREF 2x10-3
ICs
69
qSI-8000GL Series
sExample of Pattern on PC Board
SI-8010GL
C9 C6
VIN
R2 R3 C1
+
C7 C2
R1
+ GND
C3 D1 L1 C8
V0
C4
C5
Recommended Pattern *For the optimum conditions, use one-point GND wiring centering on pin 1, and place each component as closely as possible.
sTa-PD Characteristics
100 VO -1 -VF * IO 1- VIN
PD=VO * IO
1.8 1.6 1.4 1.2
j-a:100C/W
Power Dissipation PD (W)
1 0.8 0.6 0.4 0.2 0 -25 0 25 50 75 100 125
Note 1: The efficiency depends on the input voltage and the output current. Thus, obtain the value from the efficiency graph and substitute the percentage in the formula above. Note 2: Thermal design for D1 must be considered separately. VO : Output voltage VIN: Input voltage IO : Output current : Efficiency VF : Diode forward voltage RK16***0.4V(IO=1A)
Ambient Temperature Ta (C)
sPackaging specifications
Minimum package Stick Qty: 50 pcs/1 stick
5.01.0
11.60.2
(Unit: mm)
Stopper (with fin)
4.20.15 130.2 5051.0
5.70.2
Stopper (without fin) 50pcs
5
qSI-8000GL Series
sTypical characteristics (SI-8010GL)
Efficiency Characteristics
100 VO=24V 90 VO=5V Ta=25C IO=1.5A
1A
Output Voltage
1.2 *Load=C.R Ta=25C
Load Regulation
1.03 Ta=25C
1.0
1.02
Output Voltage VO (V)
0.8 IO=0.02A 1A 1.5A 0.6
Output Voltage VO (V)
0.5A
Efficiency (%)
1.01 VIN=8V 12V 1.00 20V 30V 0.99
80
IO=1.5A 1A 0.5A IO=1.5A
70
VO=1.8V
0.4
60 1A 50 0.5A 0 10 20 30 40 50
0.2
0.98
0
0
5
10
15
20
0.97
0
0.5
1.0
1.5
Input Voltage VIN (V)
Input Voltage VIN (V)
Output Current IO (A)
Overcurrent Protection Characteristics
1.2 Ta=25C VIN=30V 20V 12V 8V 1.0
Thermal Protection Characteristics
1.2 VIN=12V, IO=0.02A
Temperature Characteristics
300 VIN=12V, IO=1A 1.015
Frequency Freq (kHz) Efficiency (%)
1.0
250
Freq
1.01
Output Voltage VO (V)
Output Voltage VO (V)
0.8
0.8
200
1.005
0.6
0.6 TSD OFF 0.4 TSD ON
150 VO 100
1
0.4
0.995
0.2
0.2
0
0
1
2
3
4
0 50
100
150
200
50 -50
0 50 100
0.99 150
Output Current IO (A)
Ambient Temperature Ta (C)
Ambient Temperature Ta (C)
6
Output Voltage VO (V)

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