SI-8100QL

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 θj-c θj-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 70×60 mm (copper laminate area: 1310 mm2) When mounted on glass-epoxy board measuring 70×60 mm (copper laminate area: 1310 mm2) Conditions *1: Limited by thermal protection circuit *2: Note that the detect temperature for thermal protection is about 140°C. ■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=25°C and Vo=5V) Symbol min. VADJ Conditions (∆VADJ/∆T) Conditions η 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 +85°C 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 µA µA V V µA V/V µA/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 6.5±0.2 4.2±0.3 3.4±0.1 7.5±0.5 9.4±0.3 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 0.25-0.0 5 2.54 0.89 TYP 0.5±0.1 3.3±0.2 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 C1:10µ F/50V (Murata: GRM55DB31H106KA87) C2:22µ F/16V (Murata: GRM32ER71A226KE20) C3:560pF (Murata: GRM18 Type) C4:10nF (Murata: GRM18 Type) C5:10nF (Murata: GRM18 Type) L1:10µ H D1:SPB-G56S (Sanken) SJPB-L4 (Sanken) R1:46kΩ (When Vo = 5 V) R2:5.1kΩ R3:24kΩ 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 73