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LR8421 - 500KHz Synchronous Boost Converter

General Description

Boost and Rectifying Switch Input.

pin and VIN.

to reduce EMI and voltage overshoot.

Key Features

  • S: z Up to 90% Efficiency at IOUT=2A VOUT=5V from 3.3V Input z Low Device Quiescent Current: 70ȝA (Max) z Guaranteed 2.5A Output Current at VOUT=5V from 3.3V Input z 500kHz PWM Switching Frequency z Synchronous and Embedded Power MOSFETs; No Schottky Diode Required z Low RDS(ON) (main switch/synchronous switch) at 5.0V output: 35/42mohm z Input Voltage Range: 1.8V to 5.25V z Adjustable Output Voltage Range: from 2.5V to 5.5V z Pulse Frequency Modulation Operation for Improved Efficiency at Low O.

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Datasheet Details

Part number LR8421
Manufacturer LRC
File Size 177.60 KB
Description 500KHz Synchronous Boost Converter
Datasheet download datasheet LR8421 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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5A, 500KHz Synchronous Boost Converter with Output Disconnect LESHAN RADIO COMPANY, LTD. LR8421 Series „ INTRODUCTION: The LR8421 devices provide a power supply solution for products powered by either a one-cell Li-Ion or Li-polymer, or a two to three-cell alkaline, NiCd or NiMH battery. The converter generates a stable output voltage that is adjusted by an external resistor divider. It provides high efficient power conversion and is capable of delivering output currents up to 2.1A at 5V at a supply voltage down to 3V. The implemented boost converter is based on a fixed switching frequency (500kHz typical), current-mode controller using a synchronous rectifier to obtain maximum efficiency.