MP2145

5.5V, 6A, 1.2MHz, High-Efficiency, 40

μA I

Q

Constant On-Time

Synchronous, Step-Down Switcher

MP2145 Rev. 1.11

www.MonolithicPower.com

1

12/20/2016

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

© 2016 MPS. All Rights Reserved.

DESCRIPTION

The MP2145 is a monolithic, step-down, switch-

mode converter with internal power MOSFETs. It

can achieve up to 6A continuous output current

from a 2.8V-to-5.5V input voltage with excellent

load and line regulation. The output voltage can

be regulated to as low as 0.6V.

Constant-on-time control provides a fast transient

response and eases loop stabilization. Fault

condition

protections

include

cycle-by-cycle

current limiting and thermal shutdown.

The MP2145 is available in a small QFN2×3mm

package and requires only a minimal number of

readily-available, standard, external components.

The MP2145 is ideal for a wide range of

applications, including storage (SSD, HDD), high-

performance DSPs,

FPGAs,

and distributed

power systems.

FEATURES

 Up to 6A Output Current

 Wide 2.8V-to-5.5V Operating Input Range

 20mΩ and 12mΩ Internal Power MOSFETs

 40µA Quiescent Current

 1.2MHz Fixed Switching Frequency

 100% Duty Cycle in Dropout

 1% Feedback Accuracy

 External Mode Control

 External VCON Control

 Adjustable Output from 0.6V

 1.5ms Internal SS Time with Pre-Bias Startup

 Cycle-by-Cycle Over Current Protection

 Short Circuit Protection with Hiccup Mode

 Stable with Low-ESR Output Ceramic

Capacitors

 Thermal Shutdown

 Available in a 2mm×3mm QFN Package

 Output Discharge Function

APPLICATIONS

 Storage (SSD, HDD)

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP2145

GND

FB

VIN

C1

22uF

EN

VIN

2.8V to 5.5V

VOUT

1.2V/6A

SW

C2

22uF

R1

200k

R2

200k

PG

EN

PG

L1

0.47uH

OUT

MODE /

VCON

MODE/

VCON

Ramp

C3

22uF

Ramp