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1-1-2 Switching Mode Regulator ICs
SI-8100QL Series Current Mode Control Step-down Switching Mode Regulator ICs
Features
* DIP8 package * Introduction of current mode control method * Output current: 3.5A * High efficiency: 90% (Vo=5V) * Built-in reference oscillator (350kHz) * Built-in drooping-type overcurrent and thermal protection circuits * Built-in soft start circuit * Built-in on/off function (Active Hi) * Low current consumption during off
Absolute Maximum Ratings
Parameter Input Voltage Power Dissipation*1 Junction Temperature*2 Storage Temperature Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient Air) Symbol VIN PD Tj Tstg j-c j-a Ratings 30 1.56 -30 to +150 -40 to +150 25 64 Unit V W C C C/W C/W When mounted on glass-epoxy board measuring 70x60 mm (copper laminate area: 1310 mm2) When mounted on glass-epoxy board measuring 70x60 mm (copper laminate area: 1310 mm2) Conditions
*1: Limited by thermal protection circuit *2: Note that the detect temperature for thermal protection is about 140C.
Recommended Operating Conditions
Parameter Input Voltage Range Output Voltage Range Output Current Range Operating Junction Temperature Range Operating Temperature Range Symbol VIN Vo Io Tjop Top Ratings SI-8105QL Vo+1*1 to 28 0.5 to 24 0 to 3.5 -30 to +125 -30 to +85 Unit V V A C C Conditions
Applications
* DVD recorder, FPD-TV * Onboard local power supplies * OA equipment
*1: The minimum value of the input voltage range is 4.75 V or Vo +1 V, whichever is higher.
Electrical Characteristics
Ratings
(When Ta=25C and Vo=5V) Symbol min. VADJ Conditions (VADJ/T) Conditions Conditions fo Conditions VoLINE Conditions VoLOAD Conditions Is Conditions Iq Conditions Iq(OFF) Conditions VIN=12V, Io=0A, VEN=0V 5 Conditions VC/EH Conditions VC/EL Conditions IC/EH Conditions AEA GEA 1/GCS DMAX DMIN VIN=12V 5 VEN=0V 1000 800 0.35 92 100 2.8 VIN=12V 2.2 VIN=12V, VSSL=0V ISSL 3.6 VIN=12V 18 VIN=12V, Io=0A, VEN=open 20 315 0.485 SI-8105QL typ. 0.500 VIN=12V, Io=1A 0.05 VIN=12V, Io=1A, Ta=-40 to +85C 90 VIN=12V, Io=1A 350 VIN=16V, Io=1A 30 VIN=8 to 28V, Io=1A 30 VIN=12V, Io=0.1 to 3.5A 6.0 60 60 385 max. 0.515 V mV/ C % kHz mV mV A mA A A V V A V/V A/V V/A % nsec. Unit
Parameter
Reference Voltage Temperature Coefficient of Reference Voltage Efficiency Oscillation Frequency Line Regulation Load Regulation Overcurrent Protection Starting Current
Quiescent Circuit Current
SS Pin
Outflow Current at Low Voltage High Level Voltage
EN Pin
Low Level Voltage Inflow Current at Low Voltage
Error Amplifier Voltage Gain Error Amplifier Transformer Conductance Current Sense Amplifier Impedance Maximum ON Duty Minimum ON Time
*: Pin 8 is the SS pin. Soft start at power on can be performed with a capacitor connected to this pin. The SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited.
SI-8100QL
8 SS C5
Soft start
72
ICs
SI-8100QL Series
External Dimensions (DIP8)
8 a 7 6 8100QL b c 1 2 3 4 5
(Unit : mm)
SK
6.50.2
4.20.3
3.40.1
7.50.5
9.40.3 1.0+0.3 -0.05 1.5+0.3 -0.05
7.6
Pin Assignment 1 BS 2 IN 3 SW 4 GND 5 FB 6 COMP 7 EN 8 SS Plastic Mold Package Type Flammability: UL 94V-0 Product Mass: Approx. 0.49 g
+0.1 0.25-0.05
2.54 0.89 TYP
0.50.1
3.30.2
0.25 M 0 to 15
Block Diagram
2 IN
OSC 5v_ldo
Current Sense Amp OCP Boot REG 1 BS
P.REG VREF
0.5V 7 EN ON OFF
PWM LOGIC OVP TSD
Drive 3 SW 5v_ldo
6 COMP UVLO
Amp 0.5V
5 FB
4 GND
8 SS
Typical Connection Diagram
C1:10 F/50V (Murata: GRM55DB31H106KA87) C2:22 F/16V (Murata: GRM32ER71A226KE20) C3:560pF (Murata: GRM18 Type) C4:10nF (Murata: GRM18 Type) C5:10nF (Murata: GRM18 Type) L1:10 H D1:SPB-G56S (Sanken) SJPB-L4 (Sanken) R1:46k (When Vo = 5 V) R2:5.1k R3:24k
VIN C4 L1 SW 3 R1 FB 5 D1 GND VFB R2 IADJ C2
7
2 IN EN SI-8105QL
1 BS
VO
C1 C5
8
SS
COMP 6 C3
GND
C6 OPEN
R3
GND
ICs
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