MP2101 – 1.6MHz SYNCHRONOUS STEP-DOWN PLUS 200mA LDO

MP2101 Rev. 1.0

www.MonolithicPower.com

7

8/18/2006

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© 2006 MPS. All Rights Reserved.

TM

OPERATION

The MP2101 is a fixed-frequency 1.6MHz,

800mA current mode PWM step-down switcher

with a 200mA low dropout (LDO) linear

regulator. The MP2101 is optimized for low

voltage, Li-Ion battery powered applications

where high efficiency and small size are critical.

The MP2101 uses an external resistor divider to

set both the switcher and LDO output voltage

from 0.6V to 6V.

IN1 3

EN1/2

FB1

FB2

GND

IN2

OUT2

PWROK

SW1

+

+

--

PWMCMP

PWM

OSC

+

--

EAMP1

ICS

SLOPE COMP

FEEDBACK

ERROR

AMP

0.6V

0.6V

FB1/2

0.66V

OUT_Hi

EAO2

OUT_Lo

EAO1

CC

17pF

BIAS

&

VOLTAGE

REFERENCE

PWM

CONTROL

LOGIC

1.6MHz

OSCILLATOR

IAMP

10X

CURRENT

SENSE

AMP

DH

DL

+

--

MAIN

SWITCH

(PCH)

SYNCHRONOUS

RECTIFIER

(NCH)

+

--

EAMP2

POWER ON RESET

WINDOW

COMPARATORS

NO

GOOD

--

+

0.54V

--

+

2/9

1

10

4

7

5

6

8

Figure 1—MP2101 Function Diagram