LTC3025

1

3025fd

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

300mA Micropower

VLDO Linear Regulator

The LTC

out) linear regulator which operates from input voltages as

low as 0.9V. The device is capable of supplying 300mA of

output current with a typical dropout voltage of only 45mV.

A BIAS supply is required to run the internal reference and

LDO circuitry while output current comes directly from

the IN supply for high efficiency regulation. The low 0.4V

internal reference voltage allows the LTC3025 output to

be programmed to much lower voltages than available in

common LDOs (range of 0.4V to 3.6V). The output voltage

is programmed via two ultrasmall SMD resistors.

The LTC3025’s low quiescent current makes it an ideal

choice for use in battery-powered systems. For 3-cell

NiMH and single cell Li-Ion applications, the BIAS voltage

can be supplied directly from the battery while the input

can come from a high efficiency buck regulator, providing

a high efficiency, low noise output.

Other features include high output voltage accuracy,

excellent transient response, stability with ultralow ESR

ceramic capacitors as small as 1μF, short-circuit and

thermal overload protection and output current limiting.

The LTC3025 is available in a tiny, low profile (0.75mm)

6-lead DFN (2mm

× 2mm) package.

1.2V Output Voltage from 1.5V Input Supply

n

±2% Voltage Accuracy over Temperature

Supply Load

× 2mm) DFN Package

LTC3025

BIAS

0.1μF

1.5V

1μF

0.1μF

Li-Ion

OR

3-CELL

NiMH

IN

SHDN

OUT

80.6k

40.2k

3025 TA01

ADJ

GND

OFF ON

1.5V HIGH

EFFICIENCY

DC/DC

BUCK

1.2

0

5

15

20

25

50

35

1.6

2.0

2.2

3025 TA01b

10

40

45

30

1.4

1.8

2.4

2.6

BIAS = 3.6V

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO

and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the

property of their respective owners.