SI-8000HD

1-1-3 DC/DC Converter ICs SI-8000HD Series Surface-Mount, Separate Excitation Step-down Switching Mode ■Features • Surface-mount package (TO263-5) • Output current: 5.5 A • High efficiency: 83% (at TYP, Vo = 5 V) • Requires only 5 discrete components (SI8008HD) • Built-in reference oscillator (150 kHz) • Built-in drooping-type overcurrent and thermal protection circuits • Built-in soft start circuit (Output ON/OFF available) • 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 43 3 +150 –40 to +150 3 33.3 Unit V W °C °C °C/W °C/W When mounted on glass-epoxy board measuring 40 ×40 mm (copper laminate area: 100% ) When mounted on glass-epoxy board measuring 40 ×40 mm (copper laminate area: 100% ) When mounted on glass-epoxy board measuring 40 ×40 mm (copper laminate area: 100% ) Conditions *1: Limited by thermal protection circuit *2: This product has built-in thermal protection circuits that may activate when the junction temperature exceeds 130°C. The recommended design for the junction temperature during IC operation is below 125°C. ■Applications • DVD recorder, FPD-TV • Onboard local power supplies • OA equipment ■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-8008HD Vo+3*1 to 40 0.8 to 24 0 to 5.5 –30 to +100 –30 to +85 Unit V V A °C °C VIN ≥ Vo+3V Conditions *1: The minimum value of the input voltage range is 4.5 V or Vo+3 V, whichever is higher. ■Electrical Characteristics Ratings Paramter Symbol min. Reference Voltage Temperature Coefficient of Reference Voltage Efficiency Oscillation Frequency Line Regulation Load Regulation Overcurrent Protection Starting Current Low Level Voltage SS Pin*1 Outflow Current at Low Voltage VADJ Conditions (∆VADJ/∆T) Conditions η Conditions fo Conditions ∆VOLINE Conditions ∆VOLOAD Conditions IS Conditions VSSL ISSL Conditions Iq Quiescent Circuit Current Conditions Iq(OFF) Conditions 10 VSSL=0V 6 VIN=15V, Io=0A 200 VIN=15V, VSS=0V 5.6 0.784 SI-8008HD typ. 0.800 VIN=15V, Io=1A ± 0.1 VIN=15V, Io=1A, Tc=0 to 100°C 83 VIN=15V, Io=3A 150 VIN=15V, Io=3A 60 VIN=10 to 30V, Io=3A 20 VIN=15V, Io=0.2 to 5.5A 6.5 VIN=15V (R1=4.2kΩ, R2=0.8kΩ when Ta=25°C and Vo=5V) Unit max. 0.816 V mV/°C % kHz 80 50 7.5 0.5 30 mV mV A V µA mA 400 µA *1: Pin 5 is the 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. 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 C3 flows into the ON/ OFF control transistor. Therefore, limit the current securely to protect the transistor if C3 capacitance is large. The SS pin is pulled up (3.7 V typ.) to the power supply in the IC, so applying the external voltage is prohibited. If this pin is not used, leave it open. SI-8008HD SI-8008HD SI-8008HD 5 SS 5 SS C3 5 SS C3 VO.ON/OFF Soft start Soft start +Vo. On/OFF 34 ICs SI-8000HD Series ■External Dimensions (TO263-5) Case temperature measurement point (0.40) 1.2 (15°) ±0.2 ±0.2 (Unit : mm) 10.0 ±0.2 (8.0) (4.4) 1.3 –0.05 +0.10 3-R0.3 (4.6) (1.75) 4.5 (6.8) ±0.2 9.2± ±0.3 15.3 (3°) ±0.1 0.10 (3°) ±0.15 2.4 (R0.3) ±0.3 ±0.2 2.0 15.30 ±0.3 9.2 ±0.2 φ1.5 Dp: ±0.2 (3°) (2×R0.45) Pin Assignment 1 IN 2 SW 3 GND 4 ADJ 5 SS Plastic Mold Package Type Flammability: UL 94V-0 Product Mass: Approx. 1.48 g ±0.2 (0.75) 4.9 0.88 ±0.10 (R0.3) 2.54 0 to 6° (0.5) ±0.1 (1.7 ±0.25 ) 1 2 3 4 9.9 ±0.2 0.8 ±0.25 ) (1.7 5 (3°) ±0.1 (1.7 ±0.25 ) 0.8 ±0.25 (1.7 ) (3°) 2-R0.3 10.0 ±0.02 ■Block Diagram SI-8008HD 1 IN PReg. 5 SS ON/OFF Soft start 4.9 ±0.2 SW OCP Latch & Drive 2 Reset OSC + – ADJ Comp. Error Amp. – + + TSD 4 GND 3 VREF ■Typical Connection Diagram L1 VIN 1 IN SW 2 R1 ADJ 4 R2 Di + VOUT ■Reference Data The acceptable loss of the package is 3 W for the SI-8000HD series, so some ranges are not available, depending on the relation between the input voltage and output current. SI-8008HD + C1 C4 SS 5 C3 GND GND 3 Thermal Resistance (junction to ambient air temperature) θj-a (°C/W) C2 55 When using glass-epoxy board measuring 40×40 mm 50 45 40 35 30 0 GND : 1500µF : 1000µF : 0.1µF (Only when using soft-start function) : 4.7µF (GMR32ER71H475KA88L (Murata Manufacturing) recommended) L1 : 100µH Di : FMB-G16L (Sanken) C1 C2 C3 C4 200 400 600 800 1000 1200 1400 1600 1800 Copper Laminate Area (mm2) ICs 35