1-1-3 DC/DC Converter ICs SI-8000HD Series Surface-Mount, Separate Excitation Step-down Switching Mode ■Features ■Absolute Maximum Ratings • Surface-mount package (TO263-5) Symbol Ratings Unit • Output current: 5.5 A Input Voltage VIN 43 V • High efficiency: 83% (at TYP, Vo = 5 V) Power Dissipation*1 PD 3 W Junction Temperature*2 Tj +150 °C Storage Temperature Tstg –40 to +150 °C Thermal Resistance (Junction to Case) θj-c 3 °C/W When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%) Thermal Resistance (Junction to Ambient Air) θj-a 33.3 °C/W When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%) • 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) Parameter Conditions When mounted on glass-epoxy board measuring 40×40 mm (copper laminate area: 100%) *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. • Low current consumption during off ■Applications • DVD recorder, FPD-TV • Onboard local power supplies • OA equipment ■Recommended Operating Conditions Parameter Ratings Symbol Unit SI-8008HD Input Voltage Range VIN Vo+3*1 to 40 V Output Voltage Range VO 0.8 to 24 V Output Current Range IO 0 to 5.5 A Operating Junction Temperature Range Tjop –30 to +100 °C Operating Temperature Range Top –30 to +85 °C Conditions VIN ≥ Vo+3V *1: The minimum value of the input voltage range is 4.5 V or Vo+3 V, whichever is higher. ■Electrical Characteristics (R1=4.2kΩ, R2=0.8kΩ when Ta=25°C and Vo=5V) Ratings Paramter Symbol SI-8008HD min. VADJ Reference Voltage 0.784 Conditions Temperature Coefficient of Reference Voltage max. 0.800 0.816 Oscillation Frequency (∆VADJ/∆T) ±0.1 Conditions VIN=15V, Io=1A, Tc=0 to 100°C Conditions VIN=15V, Io=3A Conditions VIN=15V, Io=3A Outflow Current at Low Voltage IS 20 5.6 50 6.5 Conditions mV 7.5 A VIN=15V VSSL 0.5 ISSL 10 Conditions VSSL=0V Conditions VIN=15V, Io=0A V 30 µA 6 Iq(OFF) *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. mA 200 400 µA VIN=15V, VSS=0V SI-8008HD SI-8008HD 5 SS 5 SS C3 VO.ON/OFF ICs mV VIN=15V, Io=0.2 to 5.5A Conditions 34 80 VIN=10 to 30V, Io=3A Iq Quiescent Circuit Current kHz 60 Conditions Low Level Voltage % 150 ∆VOLOAD Overcurrent Protection Starting Current SS Pin*1 fo Conditions Load Regulation mV/°C 83 ∆VOLINE Line Regulation V VIN=15V, Io=1A η Efficiency Unit typ. Soft start SI-8008HD 5 SS C3 Soft start +Vo. On/OFF SI-8000HD Series ■External Dimensions (TO263-5) (Unit : mm) 10.0 4.5 (4.4) ±0.2 +0.10 1.3 –0.05 (6.8) ±0.3 ±0.1 ±0.2 2.4 (R0.3) ±0.2 2.54 (R0.3) ±0.25 ±0.1 0.8 ±0.25 ) (1.7 ) 1 2 3 4 9.9 Flammability: UL 94V-0 0 to 6° (0.5) ±0.1 (1.7 Plastic Mold Package Type 4.9 ±0.3 2.0 (0.75) ±0.2 ±0.10 15.30 15.3 9.2± ±0.3 ±0.15 0.10 (3°) (3°) 4.9 0.88 ±0.2 (2×R0.45) (3°) 9.2 ±0.2 ±0.2 φ1.5 Dp: (4.6) 3-R0.3 Pin Assignment 1 IN 2 SW 3 GND 4 ADJ 5 SS (1.75) 1.2 (15°) ±0.2 (8.0) ±0.2 (0.40) Case temperature measurement point (1.7 ±0.25 Product Mass: Approx. 1.48 g 0.8 ±0.25 (1.7 ) ) 5 ±0.2 (3°) (3°) 2-R0.3 10.0 ±0.02 ■Block Diagram SI-8008HD 1 SW IN PReg. 2 OCP 5 SS ON/OFF Soft start Latch & Drive Reset OSC + – ADJ TSD Comp. Error Amp. GND 4 – + + VREF 3 ■Typical Connection Diagram ■Reference Data L1 SW IN SI-8008HD + C1 C4 SS 5 GND 3 2 VOUT R1 ADJ 4 + R2 C2 Di C3 GND GND C1 C2 C3 C4 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. : 1500µF : 1000µF : 0.1µF (Only when using soft-start function) : 4.7µF (GMR32ER71H475KA88L (Murata Manufacturing) recommended) L1 : 100µH Di : FMB-G16L (Sanken) Thermal Resistance (junction to ambient air temperature) θj-a (°C/W) 1 VIN 55 When using glass-epoxy board measuring 40×40 mm 50 45 40 35 30 0 200 400 600 800 1000 1200 1400 1600 1800 Copper Laminate Area (mm2) ICs 35