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RT8057A Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8057A Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 12 page  RT8057A 1 DS8057A-00 March 2011 www.richtek.com Pin Configurations Ordering Information Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. (TOP VIEW) WDFN-6SL 2x2 2.25MHz 1A Synchronous Step-Down Converter General Description The RT8057A is a high efficiency Pulse-Width-Modulated (PWM) step-down DC/DC converter, capable of delivering 1A output current over a wide input voltage range from 2.7V to 5.5V. The RT8057A is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources such as cellular phones, PDAs, hand-held devices, game console and related accessories. The internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical applications. The RT8057A enters Low Dropout Mode when normal Pulse -Width Mode cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. The RT8057A enters shut-down mode and consumes less than 1 μA when the EN pin is pulled low. The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operating frequency of 2.25MHz. The RT8057A is available in a small WDFN-6SL 2x2 package. Features 2.7V to 5.5V Wide Input Operation Range 2.25MHz Fixed-Frequency PWM Operation Up to 1A Output Current Up to 90% Efficiency 0.6V Reference Allows Low Output Voltage Internal Soft-Start No Schottky Diode Required Internal Compensation to Reduce External Components Low Dropout Operation : 100% Duty Cycle RoHS Compliant and Halogen Free Applications Portable Instruments Game Console and Accessories Microprocessors and DSP Core Supplies Cellular Phones Wireless and DSL Modems PC Cards LX NC GND VIN EN FB 5 4 1 2 3 6 7 Marking Information For marking information, contact our sales representative directly or through a Richtek distributor located in your area. VIN EN GND LX FB 4 23 5 TSOT-23-5 RT8057A Package Type QW : WDFN-6SL 2x2 (W-Type) J5 : TSOT-23-5 Lead Plating System G : Green (Halogen Free and Pb Free) Pin 1 Orientation (2) : Quadrant 2, Follow EIA-481-D (For WDFN-6SL 2x2 Only) (2) |
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