SI-8000TM_12

1-1-3 DC/DC Converter ICs SI-8000TM Series ■Features Surface-Mount, Separate Excitation Step-down Switching Mode ■Absolute Maximum Ratings Parameter DC Input Voltage Power Dissipation Junction Temperature* Storage Temperature Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient Air) Symbol VIN PD1 PD2 Tj Tstg Ratings 43 1.06 1.65 –30 to +150 –40 to +150 6 95 Unit V W °C °C °C/W °C/W When mounted on glass-epoxy board (900 mm2 copper area 4.3%) When mounted on glass-epoxy board (900 mm2 copper area 4.3%) When mounted on glass-epoxy board (900 mm2 copper area 50%) Conditions • Compact surface-mount package (TO252-5) • Output current: 1.5 A • High efficiency: 81% typ. (at Vo = 5 V) • Requires only 4 discrete components • Built-in reference oscillator (300 kHz) • Built-in drooping-type-overcurrent and thermal protection circuits • Output ON/OFF available (circuit current at output OFF: 200 µA typ.) • Soft start available by ON/OFF pin θ j-c θ j-a *: This product has built-in thermal protection circuits that may operate when the junction temperature rises above 130°C. The recommended design for the junction temperature during operation is below 125°C. ■ Applications • Onboard local power supplies • AV equipment • OA equipment ■Recommended Operating Conditions Ratings Parameter Input Voltage Range Output Voltage Output Current Range Operating Junction Temperature Range Operating Temperature Range Symbol VIN VO IO Tjop Top SI-8008TM VO+3*1 to 40 0.8 to 24 0 to 1.5 –20 to +100 –20 to +85 Unit V V A °C °C *1: The minimum value of an input voltage range is the higher of 4.5 V or VO + 3 V. ■Electrical Characteristics Rating Parameter Symbol (Ta=25°C) Reference Voltage Temperature Coefficient of Reference Voltage Efficiency Oscillation Frequency Line Regulation Load Regulation Overcurrent Protection Starting Current VADJ Conditions ∆VADJ/∆T Conditions min. 0.784 η Conditions SI-8008TM typ. 0.800 VIN=15V, Io=0.1A ±0.1 VIN=15V, Io=0.1A, Tc=0 to 100°C 81 VIN=15V, Io=0.5A Unit max. 0.816 V mV/°C % kHz fo Conditions ∆VOLINE Conditions ∆VOLOAD Conditions 300 VIN=15V, Io=0.5A 60 VIN=10 to 30V, Io=0.5A 10 VIN=15V, Io=0.2 to 1.5A 1.6 80 mV mV A 40 IS Conditions VIN=15V 10 VSSL=0V 6 VIN=15V, Io=0A 200 VIN=15V, VSS=0V 400 0.5 40 Low Level Voltage VSSL ON/OFF Pin* Outflow Current at Low Voltage V µA ISSL Conditions Iq Quiescent Circuit Current Conditions mA µA Iq (OFF) Conditions *: 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 to the power supply in the IC, so applying the external voltage is prohibited. If the pin is not used, leave it open. SI-8000TM SI-8000TM SI-8000TM 5 SS 5 SS C3 5 SS C3 VO. ON/OFF Soft start Soft start +VO. ON/OFF 18 ICs SI-8000TM Series ■External Dimensions (TO252-5) 6.60±0.20 6.60 5.34±0.20 ±0.20 (Unit : mm) 2.30 ±0.20 5.34 0.50±0.10 ±0.20 (5.04) (1.50) 1.10 ±0.20 5 9.90 1.18±0.20 2.70±0.20 2.70±0.20 (0.89) 9.90 SEATING PLANE 0.00 to 0.127 Pin Assignment q IN w SW e GND r ADJ t SS Plastic Mold Package Type Flammability: UL94V-0 Product Mass: Approx. 0.33 g R0 .3 2 6.10±0.20 ±0.30 (4.06) 0.1 8° 0 to 0.50±0.10 0.50±0.10 1.27 TYP 1 2 3 1.27 TYP 2.30±0.20 4 5 (1.00) ■Block Diagram ■Typical Connection Diagram L1 L47µH SI-8008TM VIN SW 2 1 ±0.30 IN SW 2 R1 VO 1 IN PReg. Overcurrent Protection Reset OSC + – SI-8000TM C1 220µF + SS 5 C3 GND 3 ADJ 4 R2 Di IADJ + 5 SS ON/OFF Soft Start C2 470µF Latch & Drive Comp. + + – Thermal Protection ADJ 4 GND GND Error Amp. Reference Voltage GND 3 C1 C2 C3 L1 Di : 220µF : 470µF : 1µF (Only when using soft-start function) : 47µF : SJPB-H6 (Sanken) ICs 19