SI-8000Q

1-1-3 DC/DC Converter ICs SI-8000Q Series Surface Mount, Current Mode Cntrol Step-down Switching Mode ■Features • Compact surface-mount package (HSOP8) • Introduction of current mode control method • Output current: 3.5 A • High efficiency: 90% (Vo = 5 V) • Built-in reference oscillator (500 kHz) • A ceramic capacitor can be used for output • 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 Ratings 30 1.35 –30 to +150 –40 to +150 40 74 Unit V W °C °C °C/W °C/W When mounted on glass-epoxy board, 30×30 mm (copper laminate area: 25×25 mm) When mounted on glass-epoxy board, 30×30 mm (copper laminate area: 25×25 mm) Conditions θ j-c θ j-a *1: Limited by thermal protection circuit *2: Note that the detection temperature for thermal protection is about 140°C. ■Applications • DVD recorder, FPD-TV • Onboard local power supplies • OA equipment ■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-8005Q Vo+3*1 to 28 0.5 to 24 0 to 3.5 –30 to +125 –30 to +85 Unit V V A °C °C Conditions *1: The minimum value of the input voltage range is 4.75 V or Vo +3 V, whichever is higher. ■Electrical Characteristics Rating Parameter Symbol min. Reference Voltage Temperature Coefficient of Reference Voltage Efficiency Oscillation Frequency Line Regulation Load Regulation Overcurrent Protection Starting Current VADJ Conditions ∆VADJ/∆T Conditions 0.485 SI-8005Q typ. 0.500 VIN=12V, Io=1A 0.05 (R1=4.2kΩ, R2=0.8kΩ when Ta = 25°C and Vo=5V) Unit max. 0.515 V mV/ °C % 550 60 60 6.0 VIN=12V 18 Conditions Iq(OFF) Conditions VIN=12V, Io=0A, VEN=0V 5 Conditions Vc/EN 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=16V, VSSL=0V ISSL VIN=12V, Io=0A, VEN=open 20 kHz mV mV A mA VIN=12V, Io=1A, Ta=–40 to +85°C 90 VIN=12V, Io=1A 450 500 VIN=16V, Io=1A 30 VIN=8 to 28V, Io=1A 30 VIN=12V, Io=0.1 to 3.5A 3.6 η Conditions fo Conditions ∆VOLINE Conditions ∆VOLOAD Conditions IS Conditions Iq Quiescent Circuit Current µA µA V V SS Pin Outflow Current at Low Voltage High Level Voltage EN Pin Low Level Voltage Inflow Current at Low Low Voltage µA V/V Error Amplifier Voltage Gain Error Amplifier Transformer Conductance Current Sense Amplifier Impedance Maximum ON Duty Minimum ON Time µA/V V/A % nsec. *: 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-8008Q 8 SS C8 30 ICs Soft start SI-8000Q Series ■External Dimensions (HSOP8) (Unit : mm) 4.40 6.20 Pin 1 Mark 0.695 TYP 5.20 A 1.50 Enlarged View of A Pin Assignment 1BS 2IN 3SW 4GND 5FB 6COMP 7EN 8SS Plastic Mold Package Type Flammability: UL 94V-0 0.05±0.05 1.27 0.40 0.4 2.70 0.15 0.08±0.08 2.90 Product Mass: Approx. 0.1 g ■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 C1:10µF/50V (Murata:GRM55DB31H106KA87) C2:22µF/16V (Murata:GRM32ER71A226KE20) C3:560pF*1 (Murata:GRM18 Type) C4:10nF (murata: GRM18 Type) C5:10nF (murata: GRM18 Type) L1:10µH D1: SPB-G56S (Sanken) SJPB-L4 (Sanken) R1:46kΩ (Vo=5V) R2:5.1kΩ R3:24kΩ *1 *1: When Vo=5V VIN C4 L1 SW 3 R1 FB 5 D1 GND 4 VFB R2 IADJ C2 7 2 IN EN SI-8000Q 1 BS VO C1 C5 8 SS COMP 6 C3 GND C6 OPEN R3 GND ICs 31