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SI9150CY-T1-E3 Fiches technique(PDF) 1 Page - Vishay Siliconix |
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SI9150CY-T1-E3 Fiches technique(HTML) 1 Page - Vishay Siliconix |
1 / 5 page Si9150 Vishay Siliconix Document Number: 70020 S-40752—Rev. F, 19-Apr-04 www.vishay.com 1 Synchronous Buck Converter Controller FEATURES D 6- to 16.5-V Input Range (Si9150CY) D Voltage-Mode PWM Control D Low-Current Standby Mode D Enable Control D Dual 100-mA Output Drivers D 2% Band Gap Reference D Multiple Converters Easily Synchronized D Over-Current Protection DESCRIPTION The Si9150 synchronous buck regulator controller is ideally suited for high-efficiency step down converters in battery-powered equipment. Combined with the Si9943DY MOSFET half-bridge, a 90% efficient, 7.5-W, 3.3-V or 5-V power supply can be implemented using standard surface- mount assembly techniques. The wide input range allows operation from NiCd or NiMH battery packs using six to ten cells. Over-current protection is achieved by sensing the on-state voltage drop across the high side p-channel MOSFET, which eliminates the need for a current sense resistor. Duty ratios of 0 to 100% and switching frequencies up to 300 kHz are possible. The IC can be disabled by pulling EN low (IDD = 100 mA), or the 2.5-V reference can be maintained, with all other functions disabled, by pulling STBY low (IDD = 500 mA). The Si9150 is available in both standard and lead (Pb)-free 14-pin SOIC and rated for the commercial temperature range of 0 to 70_C (C suffix), and the industrial temperature range of −40 to +85_C (D suffix). FUNCTIONAL BLOCK DIAGRAM Synchronous Buck Regulator Controller STBY SS GND ISENSE − + 0.5 V VDD EN P-GATE R Q S Oscillator, Comparators, & Error Amp Reference Generator Power Down UVLO − + + − Ref Gen OSC R Q S Break- Before- Make Logic N-GATE 1 V SYNC CT RT COMP FB VREF Error Amplifier 4.7 V 500 kW Strobe VDD Current Limit 1 2 3 4 5 6 7 8 910 11 12 13 14 20 mA 5 W |
Numéro de pièce similaire - SI9150CY-T1-E3 |
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Description similaire - SI9150CY-T1-E3 |
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