MP28162

High-Efficiency, Synchronous Buck-Boost

Converter with 1.5A MOSFETs

in a Small WLCSP Package

MP28162 Rev. 1.0

MonolithicPower.com

1

3/16/2023

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

© 2023 MPS. All Rights Reserved.

DESCRIPTION

The

MP28162

is

a

high-efficiency,

low

quiescent current (IQ), buck-boost converter that

operates from an input voltage (VIN) exceeding,

below, or equal to the output voltage (VOUT).

The device provides a compact solution for

products powered by single-cell Li-ion or multi-

cell alkaline batteries, where VOUT is within the

battery voltage (VBATT) range.

Current-mode control and the fixed pulse-width

modulation (PWM) frequency provide optimal

stability and transient response. The fixed

2MHz switching frequency (fREQ) and integrated,

low on resistance (RDS(ON)) MOSFETs reduce

the solution size and maintain high efficiency.

To optimize battery life, the MP28162 employs

selectable pulse-skip mode to reduce fREQ

under

light-load

conditions.

For

low-noise

applications where pulse-skip mode may cause

interference,

a

high-logic

input

on

the

MODE/SYNC

pin

ensures

that

the

part

operates in fixed-frequency PWM mode under

all load conditions.

The MP28162 is available in a small WLCSP-

15 (1.3mmx2.1mm) package.

FEATURES

• 1.8V Minimum Start-Up Input Voltage (V

IN)

• 1.2V to 5.5V Operating V

IN Range

• 1.5V to 5.5V Output Voltage (V

OUT) Range

• 1.5A Switching Current Limit

• 2MHz Fixed Switching Frequency (f

REQ) or

External Synchronous fREQ

• Selectable Pulse-Skip Mode or Pulse-Width

Modulation (PWM) Mode

• 25μA Typical Quiescent Current (I

Q)

• Load Disconnect during Shutdown

• Internal Soft Start (SS) and Compensation

• Short-Circuit Protection (SCP) with Hiccup

Mode

• Over-Temperature Protection (OTP)

• Available in a Small WLCSP-15

(1.3mmx2.1mm) Package

Optimized Performance with

MPS Inductor MPL-AT2010 Series

APPLICATIONS

• Optical Modules

• Portable Instruments

• Battery-Powered Devices

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”, the MPS Logo, and “Simple, Easy Solutions”

are registered trademarks, of Monolithic Power Systems, Inc. or its

subsidiaries.

TYPICAL APPLICATION

SW1

SW2

L1

VIN

VCC

EN

MODE/SYNC

VOUT

FB

AGND

PGND

C1

22µF

VIN

C3

4.7µF

C2

22µF x 3

VOUT = 3.3V

R1

300k

Ω

R2

52.3k

Ω

MP28162

1µH

0

20

40

60

80

100

0.001

0.01

0.1

1

LOAD CURRENT (A)

Efficiency vs. Load Current

V

OUT = 3.3V, VMODE = low

VIN=2.4V

VIN=3.3V

VIN=4.2V