MP3421

5.5A, 600kHz High-Efficiency, Synchronous

Step-Up Converter with True Output Disconnect

in a 2mmx2mm QFN Package

MP3421 Rev. 1.0

www.MonolithicPower.com

1

11/13/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2014 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3421 is a high-efficiency, synchronous,

current–mode, step-up converter with true

output disconnect.

The MP3421 starts up from low input voltage

(as low as 1.9V) while providing in-rush current

limiting and output short-circuit protection. The

integrated, P-channel synchronous rectifier

improves efficiency and eliminates the need for

an external Schottky diode;

the P-channel

disconnects the output load from the input

during shutdown.

The MP3421 has 600kHz switching frequency,

which

accommodates

small

external

components.

In

addition,

its

internal

compensation and soft-start functions minimize

external component count.

The MP3421

provides a compact solution for a 5V output,

2.1A load requirement, using a supply voltage

as low as 2.8V.

The MP3421 is available in a 14-pin QFN

2mmx2mm package.

FEATURES

• Support 5V/2.1A Output at 2.8V Input

• Up to 98% Efficiency

• 1.9V to 5.5V Input Range

• 2.5V to 5.5V Output Range

• Internal Synchronous Rectifier

• 600kHz Fixed-Switching Frequency

• >5.5A Switch-Current Limit Capability

• 43uA Quiescent Current

• High-Efficiency over Full-Load Range

• Internal Soft-start and Compensation

• Output-Load Disconnect from Input

• OCP, SCP, OVP and OTP Protection

• Small 2x2mm QFN14 Package

APPLICATIONS

• Battery-Powered Products

• Power Banks, Juice Packs, Battery Back-up

Units

• USB Power Supply

• Consumer Electronic Accessories

• Tablets

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Products, Quality Assurance page.

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

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11.522.5

LOAD CURRENT (A)

Efficiency vs.

Load Current