1-1-3 DC/DC Converter ICs SI-8000JD Series Surface-Mount, Separate Excitation Step-down Switching Mode ■Features ■Lineup • Surface-mount package (TO263-5) Part Number SI-8033JD SI-8050JD SI-8090JD SI-8120JD VO(V) 3.3 5.0 9.0 12.0 • Output current: 1.5A IO(A) • High efficiency: 77 to 88% • Requires only 4 discrete components 1.5 ■Absolute Maximum Ratings • Internally-adjusted phase correction and output voltage Parameter • Capable of downsizing a choke-coil due to IC's high switching frequency (125 kHz). (Compared with conventional Sanken devices) Symbol Ratings Unit DC Input Voltage VIN 43 V Output Current IO 1.5 A PD 3 W °C Power • Built-in foldback-overcurrent and thermal protection circuits • Output ON/OFF available (Circuit current at output OFF: 200µA max) Dissipation* Junction Temperature Tj +125 Storage Temperature Tstg –40 to +125 °C Thermal Resistance (Junction to Case) θ j-c 3 °C/W Thermal Resistance (Junction to Ambient Air) θ j-a 33.3 °C/W Conditions When mounted on glass-epoxy board 40 × 40 mm (copper area 100%) When mounted on glass-epoxy board 40 × 40 mm (copper area 100%) *: Limited by thermal protection circuit • Soft start available by ON/OFF pin Conditions ■Applications • Power supplies for telecommunication equipment • Onboard local power supplies, etc. ■Recommended Operating Conditions Ratings Parameter Symbol DC Input Voltage Range SI-8033JD SI-8050JD SI-8090JD SI-8120JD VIN1 5.3 to 40 7 to 40 11 to 40 14 to 40 VIN2 6.3 to 40 8 to 40 12 to 40 15 to 40 DC Output Current Range* Unit Conditions IO=0 to 1A V IO=0 to 1.5A IO 0 to 1.5 A Operating Junction Temperature Range Tjop –30 to +125 °C VIN≥VO+3V Operating Temperature Range* Top –30 to +125 °C *: Limited by Ta–PD characteristics ■Electrical Characteristics (Ta=25°C) Ratings Parameter Symbol VO Output Voltage SI-8033JD typ. max. min. 3.234 3.30 3.366 4.90 Conditions η Efficiency Conditions f Oscillation Frequency Conditions Load Regulation Temperature Coefficient of Output Voltage Overcurrent Protection Starting Current ON/OFF* Pin Conditions IS1 Conditions typ. max. min. typ. max. 5.00 5.10 8.82 9.00 9.18 11.76 12.00 12.24 VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A 77 82 86 88 VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A 125 125 125 125 VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A 80 40 100 10 10 30 VIN=15V, IO=0.2 to 0.8A 50 40 10 VIN=20V, IO=0.2 to 0.8A ±0.5 40 mV/ °C 1.6 A VIN=24V VSSL 0.5 0.5 0.5 0.5 Outflow Current at Low Voltage ISSL 100 100 100 100 Quiescent Circuit Current Conditions Iq(oFF) Conditions 7 VIN=15V, Io=0A 7 VIN=20V, Io=0A 200 VIN=15V, VON/OFF=0.3V 7 VIN=21V, Io=0A 200 VIN=20V, VON/OFF=0.3V V µA VSSL=0V 7 *: Pin 5 is the ON/OFF 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. ON/OFF-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 ON/OFF pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited. mA VIN=24V, Io=0A 200 200 VIN=21V, VON/OFF=0.3V VIN=24V, VON/OFF=0.3V µA SI-8000JD SI-8000JD SI-8000JD 5 ON/OFF 5 ON/OFF 5 ON/OFF C3 VOUT. ON/OFF ICs mV VIN=24V, IO=0.2 to 0.8A VIN=21V Conditions mV 40 ±1.0 1.6 VIN=20V kHZ 130 10 ±1.0 1.6 VIN=15V 60 % VIN=18 to 30V, IO=0.5A VIN=21V, IO=0.2 to 0.8A ±0.5 1.6 120 VIN=15 to 30V, IO=0.5A V Low Level Voltage Iq 16 Unit min. VIN=10 to 30V, IO=0.5A ∆VO/∆Ta SI-8120JD max. VIN=8 to 30V, IO=0.5A ∆VOLOAD Conditions SI-8090JD typ. VIN=15V, IO=0.5A 25 ∆VOLINE Line Regulation SI-8050JD min. Soft Start C3 Soft Start +VOUT. ON/OFF SI-8000JD Series ■External Dimensions (TO263-5) (Unit : mm) ±0.2 10.0 (8.0) ±0.2 1.2 (2×R0.45) (3°) ±0.3 ±0.15 0.10 (3°) ±0.1 (3°) ±0.2 2.54 (R0.3) 4.9 ±0.3 ±0.2 2.4 (R0.3) 2.0 (0.75) ±0.2 4.9 ±0.10 0.88 0 to 6° (0.5) ±0.1 ±0.1 ±0.25 (1.7 0.8 ±0.25 ) (1.7 ) 1 2 3 4 Pin Assignment q VIN w SWOUT e GND r VOS t ON/OFF 15.30 15.3 9.2± ±0.3 ±0.2 (6.8) ±0.2 1.3 +0.10 –0.05 ±0.2 (4.6) 3-R0.3 φ1.5 Dp: (4.4) ±0.2 4.5 9.2 (15°) (1.75) (0.40) Case temperature measurement point (1.7 ±0.25 0.8 ±0.25 (1.7 ) ) Plastic Mold Package Type Flammability: 94V-0 Product Mass: Approx. 1.48g 5 ±0.2 9.9 (3°) (3°) 2-R0.3 ±0.02 10.0 ■Typical Connection Diagram ■Block Diagram L1 VIN 1 SWOUT VIN PReg. SI-8000JD OCP 5 ON/OFF + Latch & Drive Reset SWOUT VIN 2 C1 ON/OFF Soft Start 1 VOS 2 VOUT 4 + ON/OFF GND 5 3 Di C2 C3 OSC GND + – TSD Comp. Error Amp. C1 C2 C3 L1 Di 4 + – VREF GND 3 : : : : : GND 50V/220µF 25V/470µF 10V/0.47µF (Only when using soft-start function) 100µH SJPB-H6 (Sanken) ■Reference Data Thermal Resistance (junction to ambient air) θ j-a (°C/W ) Copper Laminate Area on Glass Epoxy Board vs. Thermal Resistance (Junction to Ambient Air) (Typical Value) Output Current vs. Power Dissipation (Typical) Power Dissipation Pd (W) 55 50 With glass epoxy board of 40 × 40 mm 45 40 35 30 0 200 400 600 800 1000 1200 1400 1600 1800 Copper Laminate Area (mm2) 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 40V 30V 20V VIN 8V 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Output Current IO (A) ■Ta-PD Characteristics 3.5 Power Dissipation PD (W) 3 Copper Area 40×40 mm ( θ j-a : 33.3°C/W) PD=VO·IO 20×40 mm ( θ j-a : 37°C/W) 2.5 20×20 mm ( θ j-a :44°C/W) 2 10×10 mm ( θ j-a : 53°C/W) 100 VO –1 –VF·IO 1– ηχ VIN The efficiency depends on the input voltage and the output current. Therefore, obtain the value from the efficiency graph and substitute the percentage in the formula above. VO : Output Voltage 1.5 VIN : Input Voltage IO : Output Current 1 ηχ : Efficiency (%) 0.5 VF : D1 forward voltage 0 –25 0 25 50 75 100 125 0.4V(IO=2A)(SJPB-H6) Ambient Temperature Ta (°C) Thermal design for D1 must be considered separately. ICs 17