SI-8000FFE

1-1-3 DC/DC Converter ICs SI-8000FFE Series Full-Mold, Separate Excitation Step-down Switching Mode ■Features • Compact full-mold package (equivalent to TO220) • Output current: 3.5 A • High efficiency: 83% (Vo = 5 V, VIN = 15 V, Io = 2 A) • Requires only 6 discrete components • Built-in reference oscillator (300 kHz) • Built-in drooping-type overcurrent and thermal protection circuits • Built-in soft start circuit (Output ON/OFF available) ■Lineup Part Number Vo (V) Io (A) Function SI-8001FFE Variable (0.8 to 24) 3.5 Soft start ■Absolute Maximum Ratings Parameter Input Voltage Power Dissipation (With infinite heatsink) Power Dissipation (Without heatsink) Junction Temperature*1 Storage Temperature Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient Air) Symbol VIN PD1-1 PD1-2 PD2-1 PD2-2 Tj Tstg θj-c θj-a Ratings SI-8001FFE 43 22.7 18.2 2.15 1.72 +150 –40 to +150 5.5 58 Unit V W W °C °C °C/W °C/W Conditions Limited by thermal protection circuit, Tj=150°C Tj=125°C Limited by thermal protection circuit, Tjmax=150°C Tj=125°C ■Applications • DVD recorder, FPD-TV • OA equipment, such as printers • Onboard local power supplies *: 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. ■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-8001FFE Vo+3*1 to 40 0.8 to 24 0 to 3.5 –30 to +125 –30 to +85 Unit V V A °C °C *: The minimum value of the input voltage range is 4.5 V or Vo +3 V, whichever is higher. ■Electrical Characteristics Ratings Parameter 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 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 6 VIN=15V, VSS=0V 6 VIN=15V, Io=0A 200 VIN=15V, Vss=0V 3.6 VIN=15V 270 0.784 SI-8001FFE typ. 0.800 VIN=15V, Io=0.2A ± 0.1 (R1=4.2kΩ, R2=0.8kΩ when Ta=25°C and Vo=5V) Unit max. 0.816 V mV/ °C % 330 80 50 kHz mV mV A 0.5 30 V µA mA 600 µA VIN=15V, Io=0.2A, Tc=0 to 100°C 83 VIN=15V, Io=2A 300 VIN=15V, Io=2A 55 VIN=10 to 30V, Io=2A 15 VIN=15V, Io=0.2 to 3.5A *: 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-8000FFE SI-8000FFE SI-8000FFE 5 SS 5 SS C3 5 SS C3 VO.ON/OFF Soft start Soft start +Vo. ON/OFF 50 ICs SI-8000FFE Series ■External Dimensions (TO220F-5) (Unit : mm) 0.5 10.0 ±0.2 4.2 ±0.2 2.8 ±0.2 4.0±0.2 7.9±0.2 φ 3.2±0.2 16.9±0.3 Pin Assignment q IN w SW e GND r ADJ t SS Plastic Mold Package Type 4.6±0.6 (4.6) (17.9) 2.6±0.1 (2.0) 0.95±0.15 0.85 –0.1 P1.7±0.7×4=6.8±0.7 +0.2 Flammability: UL 94V-0 Product Mass: Approx. 2.3 g 0.45 –0.1 +0.2 3.9±0.7 (4.3) 8.2±0.7 12345 ■Block Diagram 1 IN PReg. OCP Latch & Drive SW 2 5 SS ON/OFF Soft start 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 IADJ + C2 VOUT SI-8001FFE + C1 SS 5 C3 GND GND 3 GND C1 C2 C3 L1 D1 :470µF :680µF :0.1µF(Only when using soft-start function) :47µH :RK46(Sanken) ICs 51