1-1-3 DC/DC Converter ICs SI-8000FD Series Surface Mount, Separate Excitation Step-down Switching Mode ■Lineup ■Features • Surface-mount package (TO263-5) Part Number • Output current: 3.5 A SI-8001FDE SI-8001FDL VO(V) Variable(0.8 to 24) IO(A) • High efficiency: 83% (Vo = 5 V, VIN = 15 V, Io = 2 A) 3.5 Function • Requires only 6 discrete components Soft start ON/OFF • Built-in reference oscillator (300 kHz) • Built-in drooping-type overcurrent and thermal protection circuits ■Absolute Maximum Ratings Parameter • Built-in soft start circuit (Output ON/OFF available) Symbol Input Voltage - SI-8001FDE • Built-in on/off function (active Low) - SI-8001FDL • Low current consumption during off - SI-8001FDL Ratings SI-8001FDE SI-8001FDL VIN 43 Unit Conditions V ON/OFF Control Voltage Vc Power Dissipation*1 PD – 3 VIN W V Junction Temperature*2 Tj +150 °C Storage Temperature Tstg –40 to +150 °C Thermal Resistance (Junction to Case) θj-c 3*1 °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*1 °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%) *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. ■Applications • DVD recorder, FPD-TV • OA equipment, such as printers • Onboard local power supplies ■Recommended Operating Conditions Parameter Ratings Symbol SI-8001FDE Unit SI-8050FDL 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. Input Voltage Range Vo+3*1 to 40 V 0.8 to 24 V 0 to 3.5 A –30 to +100 °C –30 to +85 °C ■Electrical Characteristics (R1=4.2kΩ, R2=0.8kΩ when Ta = 25°C and Vo=5V) Ratings Parameter Symbol SI–8001FDE min. Reference Voltage Temperature Coefficient of Reference Voltage ∆VADJ/∆T Conditions Line Regulation Load Regulation Overcurrent Protection Starting Current fO min. 0.800 0.816 0.784 83 83 VIN=15V, Io=2A VIN=15V, Io=2A 300 330 50 mV 50 mV 3.6 VIN=15V 6 0.5 – – – 30 – – – – – VIN=15V, VSS=0V – – ON/OFF Control Voltage (Output off) Vc, IL – – – Ic, IH – – – – V 2.0 V 6 100 – Vc=2V Iq 6 6 VIN=15V, Io=0A µA mA VIN=15V, Io=0A 600 30 VIN=15V, Vss=0V *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 V µA 0.8 Conditions 200 A VIN=15V – Conditions kHz VIN=15V, Io=0.2 to 3.5A 3.6 Conditions % 80 VIN=15V, Io=0.2 to 3.5A Iq(OFF) mV/ °C VIN=10 to 30V, Io=2A Vc, IH Quiescent Circuit Current 300 80 Conditions V VIN=15V, Io=2A ON/OFF Control Voltage (Output on) ON/OFF Controll Current (Output on) 270 VIN=10 to 30V, Io=2A Conditions ISSL 330 VIN=15V, Io=2A ∆VOLOAD VSSL 0.816 ±0.1 Conditions Outflow Cuurent 0.800 VIN=15V, Io=0.2A VIN=15V, Io=0.2A, Tc=0 to 100°C ∆VOLINE IS max. ±0.1 270 Conditions Unit typ. VIN=15V, Io=0.2A, Tc=0 to 100°C Conditions Low Level Voltage at Low Voltage max. VIN=15V, Io=0.2A Conditions Oscillation Frequency ON/OFF Pin*2 0.784 Conditions η Efficiency SS Pin*1 VADJ SI–8001FDL typ. 200 µA VIN=15V, Vc=2V SI-8001FDE 5 SS SI-8001FDE 5 SS C3 SI-8001FDE 5 SS C3 LS-TTL. Therefore, the device can be driven directly by LS-TTLs. VO.ON/OFF 32 ICs Soft start Soft start +Vo. On/OFF SI-8000FD Series ■External Dimensions (TO263-5) (Unit : mm) 10.0 4.5 (4.4) ±0.2 +0.10 1.3 –0.05 (R0.3) 0 to 6° (0.5) ±0.1 0.8 ±0.25 ) (1.7 ±0.25 ) 1 2 3 4 9.9 ±0.2 (6.8) ±0.2 2.54 4.9 ±0.3 2.0 2.4 (R0.3) ±0.1 (1.7 9.2 ±0.3 ±0.1 ±0.2 (0.75) ±0.2 ±0.10 15.30 15.3 9.2± ±0.3 ±0.15 0.10 (3°) (3°) 4.9 0.88 Pin Assignment 1 IN 2 SW 3 GND (Common to the rear side of the product) 4 VADJ 5 SS or Vc (2×R0.45) (3°) ±0.2 φ1.5 Dp: (4.6) 3-R0.3 ±0.2 (1.75) 1.2 (15°) ±0.2 (8.0) ±0.2 (0.40) Case temperature measurement point (1.7 Plastic Mold Package Type Flammability: UL 94V-0 Product Mass: Approx. 1.48g 0.8 ±0.25 (1.7 ) ±0.25 ) 5 ±0.2 (3°) (3°) 2-R0.3 10.0 ±0.02 ■Block Diagram SI-8001FDE 1 SI-8001FDL SW IN PReg. SW VIN 1 2 PReg. OCP 5 SS 2 OCP 5 VC ON/OFF Soft start Latch & Drive Reset Latch & Drive Reset ON/OFF OSC OSC + – ADJ VADJ TSD Comp. Error Amp. 4 TSD Comp. 4 Error Amp. – + + VREF VREF GND GND 3 3 ■Typical Connection Diagram L1 1 VIN SW IN SI-8000FDE + C1 SS 5 GND 3 L1 2 VOUT 1 VIN SI-8001FDL R1 ADJ 4 + C2 R2 Di SW IN + C1 Vc 5 GND 3 IADJ 2 VOUT R1 ADJ 4 + C2 R2 Di IADJ C3 GND GND C1 C2 C3 L1 Di : 470µF : 680µF : 0.1µ (Only when using soft-start function) : 47µH : SPB-G56S (Sanken) GND GND C1 C2 L1 Di : 470µF : 680µF : 47µH : SPB-G56S (Sanken) ICs 33