SI-8000FD

1-1-3 DC/DC Converter ICs SI-8000FD Series Surface Mount, Separate Excitation Step-down Switching Mode ■Features • Surface-mount package (TO263-5) • 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) - SI-8001FDE • Built-in on/off function (active Low) - SI-8001FDL • Low current consumption during off - SI-8001FDL ■Lineup Part Number VO(V) IO(A) Function Soft start SI-8001FDE Variable(0.8 to 24) 3.5 ON/OFF SI-8001FDL ■Absolute Maximum Ratings Parameter Input Voltage ON/OFF Control Voltage Power Dissipation*1 Junction Temperature*2 Storage Temperature Thermal Resistance (Junction to Case) Thermal Resistance (Junction to Ambient Air) Symbol VIN Vc PD Tj Tstg θj-c θj-a – 3 +150 –40 to +150 3*1 33.3*1 Ratings SI-8001FDE SI-8001FDL 43 VIN Unit V 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 ■Applications • DVD recorder, FPD-TV • OA equipment, such as printers • Onboard local power supplies *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. ■Recommended Operating Conditions Parameter Input Voltage Range Symbol Ratings SI-8001FDE Vo+3*1 to 40 0.8 to 24 0 to 3.5 –30 to +100 –30 to +85 SI-8050FDL Unit V V A °C °C VIN Output Voltage Range VO Output Current Range IO Operating Junction Temperature Range Tjop Operating Temperature Range Top *1: 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*1 Outflow Cuurent at Low Voltage ON/OFF Control Voltage (Output on) ON/OFF Pin*2 ON/OFF Control Voltage (Output off) ON/OFF Controll Current (Output on) VADJ Conditions ∆VADJ/∆T Conditions 0.784 SI–8001FDE typ. 0.800 VIN=15V, Io=0.2A ± 0.1 VIN=15V, Io=0.2A, Tc=0 to 100°C 83 VIN=15V, Io=2A 270 300 VIN=15V, Io=2A 80 VIN=10 to 30V, Io=2A 50 VIN=15V, Io=0.2 to 3.5A 3.6 VIN=15V 0.5 6 VIN=15V, VSS=0V – – – – – – – 6 VIN=15V, Io=0A 200 VIN=15V, Vss=0V 600 – – – 2.0 30 – – – 3.6 330 270 max. 0.816 min. 0.784 (R1=4.2kΩ, R2=0.8kΩ when Ta = 25°C and Vo=5V) SI–8001FDL typ. 0.800 VIN=15V, Io=0.2A ± 0.1 VIN=15V, Io=0.2A, Tc=0 to 100°C 83 VIN=15V, Io=2A 300 VIN=15V, Io=2A 80 VIN=10 to 30V, Io=2A 50 VIN=15V, Io=0.2 to 3.5A VIN=15V – – – – – – 0.8 6 Vc=2V 6 VIN=15V, Io=0A 30 VIN=15V, Vc=2V 200 100 330 max. 0.816 V mV/ °C % kHz mV mV A V Unit η Conditions fO Conditions ∆VOLINE Conditions ∆VOLOAD Conditions IS Conditions VSSL ISSL Conditions Vc, IH Vc, IL Ic, IH Conditions Iq Conditions Iq(OFF) Conditions µA V V µA mA Quiescent Circuit Current 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. *2: Output is OFF when the output control terminal VC is open. Each input level is equivalent to LS-TTL. Therefore, the device can be driven directly by LS-TTLs. SI-8001FDE SI-8001FDE SI-8001FDE 5 SS 5 SS C3 5 SS C3 VO.ON/OFF Soft start 32 ICs Soft start +Vo. On/OFF SI-8000FD Series ■External Dimensions (TO263-5) Case temperature measurement point (0.40) 1.2 (Unit : mm) 10.0 ±0.2 (15°) ±0.2 (8.0) 4.5 3-R0.3 ±0.2 (4.4) 1.3 –0.05 +0.10 (4.6) (1.75) (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 ±0.2 2.0 15.30 ±0.3 (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 4.9 ±0.2 9.2 ±0.2 φ1.5 Dp: ±0.2 (3°) (2×R0.45) Pin Assignment 1 IN 2 SW 3 GND (Common to the rear side of the product) 4 VADJ 5 SS or Vc Plastic Mold Package Type Flammability: UL 94V-0 Product Mass: Approx. 1.48g (1.7 ±0.25 ) 0.8 ±0.25 (1.7 ) (3°) 2-R0.3 10.0 ±0.02 ■Block Diagram SI-8001FDE SI-8001FDL 1 IN PReg. OCP SW 2 1 VIN PReg. OCP Latch & Drive SW 2 5 SS ON/OFF Soft start 5 VC Reset OSC + – Latch & Drive Reset ON/OFF OSC VADJ Comp. – + + ADJ TSD 4 Comp. Error Amp. TSD 4 Error Amp. GND 3 VREF VREF GND 3 ■Typical Connection Diagram L1 VIN 1 IN SW 2 R1 ADJ 4 R2 Di IADJ + C2 C1 + VOUT VIN 1 IN SW 2 L1 VOUT R1 ADJ 4 R2 Di IADJ + C2 SI-8000FDE + C1 SS 5 C3 GND GND 3 SI-8001FDL Vc 5 GND 3 GND GND GND C1 C2 C3 L1 Di : 470µF : 680µF : 0.1µ (Only when using soft-start function) : 47µH : SPB-G56S (Sanken) C1 C2 L1 Di : 470µF : 680µF : 47µH : SPB-G56S (Sanken) ICs 33