MP2040

Fast Transient Response, 3A Dual Supply

Very Low Dropout Linear Regulator

MP2040 Rev.1.0

www.MonolithicPower.com

1

9/21/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2040 is a very low dropout, dual supply

linear regulator. The use of two supplies allows

the BIAS to control an NMOS device. The

NMOS device supplies power to the load via

the IN. In this way the input supply can be just

above the desired output, yet still provide very

good regulation performance due to the higher

bias supply. The BIAS operates from a 3.3V to

5.5V input and regulates the output voltage to

as low as 0.9V, and as high as 3.3V.

The MP2040 can supply up to 3A of load

current with a typical dropout voltage of 150mV.

The BIAS runs the internal reference and drive

circuitry, while the output current comes directly

from the IN for high efficiency regulation.

Other features of MP2040 include thermal

overload and current limit protection, power

good indicator, stability with ultra low ESR

ceramic capacitors as low as 1uF, and fast

transient response. The MP2040 is available in

10-pin QFN (3mm x 3mm), and in QFN (5mm x

5mm) packages.

FEATURES

• Wide 1.1V to 5V Input Voltage Range

• Stable with Very Small Ceramic Capacitors

• 150mV Dropout at 3A Output

• 2% Accurate Output Voltage

• Adjustable Output Range of 0.9V to 3.3V

• Very fast transient response

• PSRR

o

40dB at 100kHz

• Better Than 0.001%/mA Load Regulation

• Stable With Low-ESR Output Capacitors

• Internal Thermal Protection

• Current Limit Protection

• 0.1µA

Typical

Quiescent

Current

at

Shutdown

• Power Good Indicator

APPLICATIONS

• Industrial Process & Control Equipment

• Telecom Equipment

• PAID Storage

• DSP/ASIC/µC Post Regulation for Switching

Power Supplies

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

C6

10nF

U1

IN

OUT

OUT

FB

EN

BP

IN

BIAS

PG

GND

MP2040

5

3

1

8

9

6

10

7

2

4

VIN

BIAS

PGOOD

GND

C8

1nF

EN

VOUT

1.2V/3A