MP2000 – LOW INPUT VOLTAGE, 150mA LINEAR REGULATOR

MP2000 Rev. 0.92

www.MonolithicPower.com

5

3/2/2006

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TM

OPERATION

The MP2000 is a low-current, low-voltage,

low-dropout linear regulator. It is intended for

use in devices that require very low voltage and

low quiescent current power such as wireless

modems, pagers and cellular phones.

The MP2000 uses a PNP pass element and

features internal thermal shutdown and an

internal current limit circuit.

MP2000_F01_BD02

R1

R2

--

+

BANDGAP

REFERENCE

EXTERNAL

RESISTOR

DIVIDER

1

3

2

4

5

Figure 1—Adjustable Regulator

APPLICATION INFORMATION

Setting the Output Voltage

The output voltage can be adjusted by

changing the values of the external resistor

divider.

Use the following equation to determine these

values:

⎟

⎠

⎞

⎜

⎝

⎛ +

×

=

2

R

1

R

1

V

5

.

0

Typically R1 + R2 are recommended to be less

than 100kΩ.

In Figure 2, C2 is added for improved transient

response.

TYPICAL APPLICATION CIRCUIT - ADJUSTABLE

MP2000_F02_TAC01

MP2000-ADJ

FB

OUT

4

5

GND

2

EN

IN

3

1

OUTPUT

1.2V

1.35V to 6.0V

C2

100nF