1-1-3 DC/DC Converter ICs SI-8000TFE Series Full-Mold, Separate Excitation Step-down Switching Mode ■Features ■Lineup • Compact full-mold package (equivalent to TO220) Part Number SI-8008TFE VO (V) Variable (0.8 to 24) • Output current: 1.5 A SI-8050TFE 5 IO (A) 1.5 • High efficiency: 81% typ. (at Vo = 5 V) • Requires only 4 discrete components • Built-in reference oscillator (300 kHz) ■Absolute Maximum Ratings • Built-in dropping-type-overcurrent and thermal protection circuits DC Input Voltage • Output ON/OFF available (circuit current at output OFF: 200µA typ.) Power Dissipation Parameter Symbol Ratings Unit VIN 43 V PD1-1 17.8 (with infinite heatsink) PD1-2 14.2 (with infinite heatsink) PD2-1 2.15 (without heat sink, standalone operation) PD2-2 1.72 (without heatsink, standalone operation) Tj –30 to +150 Storage Temperature Tstg –40 to +150 °C Thermal Resistance (Junction to Case) θ j-c 7 °C/W Thermal Resistance (Junction to Ambient Air) θ j-a 58 °C/W • Soft start available by ON/OFF pin Junction Temperature* ■Applications • Onboard local power supplies • AV equipment • OA equipment Conditions Limited by thermal protection, Tjmax=150°C Tjmax=125°C W Limited by thermal protection, Tjmax=150°C Tjmax=125°C °C *: 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. ■Recommended Operating Conditions Ratings Parameter Symbol Input Voltage Range VIN Output Voltage Range VO Output Current Range SI-8008TFE SI-8050TFE Vo+3*1 to 40 0.8 to 24 8 to 40 5.0 Tjop Operating Temperature Range Top (Ta=25°C) V V A 0 to 1.5 –20 to +125 –20 to +85 IO Operating Junction Temperature Range Unit °C °C *1: The minimum value of an input voltage range is the higher of 4.5 V or VO + 3 V. ■Electrical Characteristics (Ta=25°C) Ratings Parameter Symbol SI-8008TFE typ. min. Output Voltage Reference Voltage Temperature Coefficient of Output Voltage Temperature Coefficient of Reference Voltage Vo VADJ 0.784 Conditions ∆Vo/∆T ∆VREF/∆T Conditions η Efficiency Conditions Oscillation Frequency Conditions Low Level Voltage ON/OFF Pin* Outflow Current at Low Voltage Conditions 10 VSSL=0V Conditions 6 VIN=15V, Io=0A Conditions 200 VIN=15V, VSS=0V Iq(OFF) mV/°C 80 40 400 0.5 40 200 VIN=15V, VSS=0V SI-8000TFE 5 SS mV mV A 10 VSSL=0V V µA mA 400 SI-8000TFE 5 SS µA SI-8000TFE 5 SS C3 VO.ON/OFF ICs 40 6 VIN=15V, Io=0A *: 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. 40 80 VIN=15V 0.5 40 % kHz 1.6 VIN=15V Iq V VIN=15V, Io=0.1A ±0.5 1.6 Conditions VSSL ISSL Quiescent Circuit Current 0.816 300 VIN=15V, Io=0.5A 60 VIN=10 to 30V, Io=0.5A 10 VIN=15V, Io=0.2 to 1.5A ∆VOLOAD IS max. 5.10 300 VIN=15V, Io=0.5A 60 VIN=10 to 30V, Io=0.5A 10 VIN=15V, Io=0.2 to 1.5A fo Conditions Overcurrent Protection Starting Current Unit SI-8050TFE typ. 5.00 min. 4.90 VIN=15V, Io=0.1A, Tc=0 to 100°C 81 VIN=15V, Io=0.5A ∆VOLINE Load Regulation max. ±0.1 VIN=15V, Io=0.1A, Tc=0 to 100°C 81 VIN=15V, Io=0.5A Conditions Line Regulation 0.800 VIN=15V, Io=0.1A Ratings Soft start C3 Soft start +VO.ON/OFF SI-8000TFE Series ■External Dimensions (TO220F-5) (Unit : mm) ±0.2 4.2 ±0.2 2.8 φ 3.2±0.2 0.5 ±0.2 (2.0) 2.6±0.1 Pin Assignment q IN w SW e GND r ADJ t SS (17.9) 16.9±0.3 4.0±0.2 7.9±0.2 10.0 (4.6) +0.2 4.6±0.6 0.95±0.15 0.85 –0.1 Plastic Mold Package Type Flammability: UL94V-0 Product Mass: Approx. 2.3g +0.2 P1.7±0.7×4=6.8±0.7 0.45 –0.1 3.9±0.7 (4.3) 8.2±0.7 1 2 3 4 5 ■Block Diagram ■Typical Connection Diagram L1 47µH SW IN 5 SS Latch & Drive Reset SW IN SI-8000TFE C1 220µF + SS 5 GND 3 2 VOUT R1 ADJ 4 + R2 Di C2 470µF IADJ C3 OSC + – ON/OFF Soft Start 2 Overcurrent Protection PReg. Thermal ADJ Protection 4 Comp. Error Amp. + + – 1 1 VIN SI-8008TFE Reference Voltage GND 3 GND GND C1 : 220µF C2 : 470µF C3 :1µF (Only when using soft-start function) L1 : 47µH Di : RK16 (Sanken) ICs 41