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 •Output current: 1.5A VO(V) 3.3 5.0 9.0 12.0 IO(A) 1.5 •High efficiency: 77 to 88% •Requires only 4 discrete components ■ Absolute Maximum Ratings •Internally-adjusted phase correction and Parameter Symbol Ratings Unit Conditions output voltage DC Input Voltage VIN 43 V •Capable of downsizing a choke-coil due to IC's Output Current IO 1.5 A high switching frequency (125 kHz). (Com- When mounted on glass-epoxy board 40 × 40 mm (copper pared with conventional Sanken devices) Power Dissipation* PD 3 W area 100%) •Built-in foldback-overcurrent and thermal Junction Temperature Tj +125 °C protection circuits Storage Temperature Tstg –40 to +125 °C Thermal Resistance (Junction to Case) θj-c 3 °C/W •Output ON/OFF available (Circuit current at Thermal Resistance (Junction to When mounted on glass-epoxy board 40 × 40 mm (copper output OFF: 200µA max) Ambient Air) θj-a 33.3 °C/W area 100%) •Soft start available by ON/OFF pin Conditions *: Limited by thermal protection circuit ■ Applications •Power supplies for telecommunication equipment •Onboard local power supplies, etc. ■ Recommended Operating Conditions Ratings Parameter Symbol Unit Conditions SI-8033JD SI-8050JD SI-8090JD SI-8120JD VIN1 5.3 to 40 7 to 40 11 to 40 14 to 40 IO=0 to 1A DC Input Voltage Range V VIN2 6.3 to 40 8 to 40 12 to 40 15 to 40 IO=0 to 1.5A DC Output Current Range* IO 0 to 1.5 A VIN≥VO+3V Operating Junction Temperature Range Tjop –30 to +125 °C Operating Temperature Range* Top –30 to +125 °C *: Limited by Ta–PD characteristics ■ Electrical Characteristics (Ta=25°C) Ratings Parameter Symbol SI-8033JD SI-8050JD SI-8090JD SI-8120JD Unit min. typ. max. min. typ. max. min. typ. max. min. typ. max. VO 3.234 3.30 3.366 4.90 5.00 5.10 8.82 9.00 9.18 11.76 12.00 12.24 Output Voltage V Conditions VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A η 77 82 86 88 Efficiency % Conditions VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A f 125 125 125 125 Oscillation Frequency Conditions VIN=15V, IO=0.5A VIN=20V, IO=0.5A VIN=21V, IO=0.5A VIN=24V, IO=0.5A kHZ ∆VOLINE 25 80 40 100 50 120 60 130 Line Regulation mV Conditions VIN=8 to 30V, IO=0.5A VIN=10 to 30V, IO=0.5A VIN=15 to 30V, IO=0.5A VIN=18 to 30V, IO=0.5A ∆VOLOAD 10 30 10 40 10 40 10 40 Load Regulation mV Conditions VIN=15V, IO=0.2 to 0.8A VIN=20V, IO=0.2 to 0.8A VIN=21V, IO=0.2 to 0.8A VIN=24V, IO=0.2 to 0.8A Temperature Coefficient of Output Voltage ∆VO/∆Ta ±0.5 ±0.5 ±1.0 ±1.0 mV/°C Overcurrent Protection IS1 1.6 1.6 1.6 1.6 Starting Current Conditions VIN=15V VIN=20V VIN=21V VIN=24V A Low Level Voltage VSSL 0.5 0.5 0.5 0.5 V ON/OFF* Outflow Current ISSL 100 100 100 100 Pin at Low Voltage Conditions VSSL=0V µA Iq 7 7 7 7 mA Conditions VIN=15V, Io=0A VIN=20V, Io=0A VIN=21V, Io=0A VIN=24V, Io=0A Quiescent Circuit Current Iq(oFF) 200 200 200 200 Conditions VIN=15V, VON/OFF=0.3V VIN=20V, VON/OFF=0.3V VIN=21V, VON/OFF=0.3V VIN=24V, VON/OFF=0.3V µA *: 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. SI-8000JD SI-8000JD SI-8000JD 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. 5 ON/OFF 5 ON/OFF 5 ON/OFF 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 C3 C3 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. VOUT. ON/OFF Soft Start Soft Start +VOUT. ON/OFF 16 ICs

SI-8000JD Series ■ External Dimensions (TO263-5) (Unit : mm) Case temperature measurement point 10.0±0.2 (0.40) (15°) ±0.21.2 3-R0.3 4.5±0.2 1.3+–00..0150 (1.75) ((48..40)) φ1.5 Dp:±0.2 (4.6)±0.2±9.2±0.315.3 (3(°3)°) 0.(130°)±0.15 ±0.315.30 (2×R0.45) (6.8)±0.29.2 Pqwin AVSsWINsiOgUnTment ±0.12.0 (2R.04.±30.)2 e GND 0.88±0.10 ±0.24.9 (0.75) (R0.3) ±0.32.54(0.5)0 to 6° ±0.24.9 rt VOONS/OFF 0.8±0.1 0.8±0.1 (1.7±0.25) (1.7±0.25) (1.7±0.25) (1.7±0.25) Plastic Mold Package Type 1 2 3 4 5 (3°) 9.9±0.2 (3°) Flammability: 94V-0 Product Mass: Approx. 1.48g 2-R0.3 10.0±0.02 ■ Block Diagram ■ Typical Connection Diagram L1 VIN 1 VIN SWOUT2 VOUT 1 VIN SWOUT 2 SI-8000JD VOS4 5ON/OFF PReg. OCP C1 + ON/OFFGND +C2 5 3 Di ONSS/toOafrtFtF OSC Reset LDatrcivhe & C3 GND GND + –Comp. TSD 4 C1 :50V/220µF Error Amp. + C2 :25V/470µF – C3 :10V/0.47µF (Only when using soft-start function) VREF L1 :100µH GND 3 Di :SJPB-H6 (Sanken) ■ Reference Data Copper Laminate Area on Glass Epoxy Board vs. Thermal Resistance (Junction to Ambient Air) (Typical Value) Output Current vs. Power Dissipation (Typical) Thermal Resistance (junction to ambient air) j-a (C/W )θ°554433505050 With glass epoxy board of 40 × 40 mm Power Dissipation Pd (W)222211111000............642086420864 VIN 8V 20V 30V40V 0 200 400 600 800 1000 1200 1400 1600 1800 0.2 Copper Laminate Area (mm2) 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Output Current IO (A) ■ Ta-PD Characteristics 3.5Copper Area 100 VO 40×40 mm PD=VO·IO –1 –VF·IO 1– 3( θ j-a : 33.3°C/W) ηχ VIN 20×40 mm W) ( θ j-a : 37°C/W) P (D 2.52( θ0 ×j-2a0 : 4m4m°C/W) Tfrohme ethffeic ieefnficciye ndceyp egnradpsh o ann tdh es uinbpstuittu vteo ltthaeg ep earncde nthtaeg oeu intp tuhte c fuorrrmenutl.a T ahbeorveefo.re, obtain the value pation 21( θ0 ×j-1a0 : m53m°C/W) VO :Output Voltage Dissi1.5 VIN:Input Voltage wer 1 IO :Output Current o P ηχ:Efficiency (%) 0.5 VF :D1 forward voltage –025 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