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EN5311QI-E Datasheet(PDF) 1 Page - Enpirion, Inc. |
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EN5311QI-E Datasheet(HTML) 1 Page - Enpirion, Inc. |
1 / 16 page 03799 11/24/2009 Rev:B *Optimized PCB Layout file downloadable from the Enpirion Website to assure first pass design success. EN5311QI 1A Synchronous Buck Regulator With Integrated Inductor RoHS Compliant Halogen Free Featuring Integrated Inductor Technology Voltage Select DAC Switch VREF (+) (-) Error Amp V SENSE V FB V OUT VS0 VS1 VS2 Package Boundry P-Drive N-Drive UVLO Thermal Limit Current Limit Soft Start Sawtooth Generator (+) (-) PWM Comp V IN ENABLE GND Logic Compensation Network Product Highlights • Revolutionary Integrated Inductor • 5mm x 4mm x1.1mm QFN package • Very small total solution foot print* • 4 MHz switching frequency • Only two low cost MLCC caps required • Designed for low noise/low EMI • Very low ripple voltage; 5mVp-p Typical • High efficiency, up to 95% • Wide 2.4V to 6.6V input range • 1000mA continuous output current • Less than 1 μA standby current. • Excellent transient performance • 3 Pin VID Output Voltage select • External divider: 0.6V to VIN-Vdropout • 100% duty cycle capable • Short circuit and over current protection • UVLO and thermal protection • RoHS compliant; MSL 3 260°C reflow Product Overview The Ultra-Low-Profile EN5311QI is targeted to applications where board area and profile are critical. EN5311QI is a complete power conversion solution requiring only two low cost ceramic MLCC caps. Inductor, MOSFETS, PWM, and compensation are integrated into a tiny 5mm x 4mm x 1.1mm QFN package. The EN5311QI is engineered to simplify design and to minimize layout constraints. 4 MHz switching frequency and internal type III compensation provides superior transient response. With a 1.1 mm profile, the EN5311QI is ideal for space and height constrained applications. A 3-pin VID output voltage selector provides seven pre-programmed output voltages along with an option for external resistor divider. Output voltage can be programmed on-the-fly to provide fast, dynamic voltage scaling. Typical Application Circuit VIN VSense Vin VS1 VS2 VS0 10 μF 4.7 μF VOUT Vout GND ENABLE VFB Voltage Select Figure 1. Typical application circuit. Applications • Area constrained applications • Noise Sensitive Applications such as A/V and RF • LDO replacement for improved thermals • Set top box/home gateway • Smart phones, PDAs • VoIP and Video phones • Personal Media Players |
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