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Si9174DM Datasheet(PDF) 1 Page - Vishay Siliconix |
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Si9174DM Datasheet(HTML) 1 Page - Vishay Siliconix |
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1 / 17 page  Si9174 Vishay Siliconix Document Number: 71668 S-41148—Rev. C, 14-jun-04 www.vishay.com 1 High Performance Step-Down DC-DC Converter With Dynamically Adjustable Output Voltage FEATURES D 2-MHz PWM Operation D Integrated MOSFET Switches D 2.6-V to 6.0-V Input Voltage Range D Minimal Number of External Components D Up to 96% conversion efficiency D 600-mA Load Capability D 100% Duty Cycle Allows Low Dropout D Integrated Compensation Circuit D Over-Current Protection D Shutdown Current < 2 mA D Thermal Shutdown D Integrated UVLO D 10-Pin MSOP and Space Saving MLP33 Packaging D DAC Input for Dynamic Output Voltage Adjustment D Synchronizable to13-MHz Clock D User Selectable PWM, PSM, or AUTO Mode D PSM Frequency w20 kHz for Inaudible Harmonics APPLICATIONS D W-CDMA Cell Phone D PDAs/Palmtop PCs D LCD Modules D Portable Image Scanners D GPS Receivers D Smart Phones D MP3 Players D 3G Cell Phone D Digital Cameras DESCRIPTION The Si9174 is a high efficiency 600-mA step down converter with internal low on resistance power MOSFET switch and synchronous rectifier transistors. It is designed to convert one cell LiIon battery or three cell alkaline battery voltages to a dynamically adjustable dc output. The voltage on the DAC pin controls the output voltage. The output voltage is adjustable between 0.4 V and the input voltage VIN less a small dropout voltage and settles in <30 ms. In order to insure efficient conversion throughout the entire load range, PWM (pulse width modulation), PSM (pulse skipping mode) or Auto mode can be selected. In PWM mode, 2-MHz switching permits use of small external inductor and capacitor sizes allowing one of the smallest solutions. To minimize system noise, the switching frequency can be synchronized to an external 13-MHz clock. PSM mode provides increased efficiency at light loads. In PSM mode the oscillator frequency is kept above 20 kHz to avoid audio band interference. When operating in Auto mode, the converter automatically selects operating in either PWM or PSM mode according to load current demand. The Si9174 is available in the10-pin MSOP and the even smaller MLP33 package and is specified to operate over the industrial temperature range of –40_C to 85_C. The Si9174 packaged in the MLP33 package is available in both standard and lead (Pb)-free. TYPICAL APPLICATIONS CIRCUIT PWM/PSM/AUTO ENABLE DAC 13 MHz BATTERY LX VIN SYNC DAC SD MODE PGND FB AGND VOUT Si9174 2.2 mH COUT 4.7 mF CIN 10 mF VDD R2 R1 |
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