MP21148

1A, Synchronous, Step-Down Converter

with CCM

MP21148 Rev. 1.1

www.MonolithicPower.com

1

2/16/2017

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

© 2017 MPS. All Rights Reserved.

DESCRIPTION

The MP21148 is a monolithic, step-down,

switch-mode converter with built-in, internal

power

MOSFETs.

It

can

achieve

1A

of

continuous output current from a 2.3V-to-5.5V

input voltage with excellent load and line

regulation. The output voltage can be regulated

as low as 0.6V.

The constant-on-time control scheme in forced

CCM provides a fast transient response, low

output

voltage

ripple,

and

eases

loop

stabilization. Fault protections include cycle-by-

cycle current limiting and thermal shutdown.

The MP21148 is available in an ultra-small

QFN-6 (1.0mmx1.5mm) package and requires

a minimal number of readily available, standard,

external components.

The MP21148 is ideal for a wide range of

applications including high-performance DSPs,

wireless power, portable and mobile devices,

and other low-power systems.

FEATURES

 2.4MHz Switching Frequency

 EN for Power Sequencing

 Wide 2.3V-to-5.5V Operating Input Range

 Output Adjustable from 0.6V

 Up to 1A of Output Current

 120mΩ and 80mΩ Internal Power MOSFET

Switches

 Output Discharging

 100% Duty Cycle

 Short-Circuit Protection (SCP) with Hiccup

Mode

 Stable with Low ESR Output Ceramic

Capacitors

 Available in a QFN-6 (1.0mmx1.5mm)

Package

 Continuous Conduction Mode (CCM)

APPLICATIONS

 Wireless/Networking Cards

 Portable and Mobile Devices

 Battery-Powered /Wearable Devices

 Low-Voltage I/O System Power

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

MPS green status, please visit the MPS website under Quality Assurance.

“MPS” and “The Future of Analog IC Technology” are registered trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP21148

GND

FB

VIN

C1

10

μF

EN

VIN

5V

VOUT

1.2V/1A

SW

C2

10

μF

R1

200k

Ω

R2

200k

Ω

EN

OUT

L1

1

μH