ltc3025-2 Linear Technology Corporation, ltc3025-2 Datasheet

ltc3025-2

Manufacturer Part Number

ltc3025-2

Description

500ma Micropower Vldo Linear Regulators Features

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC3025-2.pdf (14 pages)

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FeaTures

applicaTions

Typical applicaTion

3-CELL

Li-Ion

NiMH

Wide Input Voltage Range: 0.9V to 5.5V

Stable with Ceramic Capacitors

Very Low Dropout: 85mV at 500mA

Adjustable Output Range: 0.4V to 3.6V (LTC3025-1)

Fixed Output: 1.2V(LTC3025-2), 1.5V(LTC3025-3),

1.8V(LTC3025-4)

±2% Voltage Accuracy over Temperature,

Supply and Load

Low Noise: 80µV

BIAS Voltage Range: 2.5V to 5.5V

Fast Transient Recovery

Shutdown Disconnects Load from V

Low Operating Current: I

Low Shutdown Current: I

Output Current Limit

Thermal Overload Protection

Available in 6-Lead (2mm × 2mm) DFN Package

Low Power Handheld Devices

Low Voltage Logic Supplies

DSP Power Supplies

Cellular Phones

Portable Electronic Equipment

Handheld Medical Instruments

Post Regulator for Switching Supply Noise Rejection

EFFICIENCY

1.5V HIGH

DC/DC

BUCK

1.2V Output Voltage from 1.5V Input Supply

1.5V

RMS

OFF ON

0.1µF

(10Hz to 100kHz)

BIAS

SHDN

= 4µA, I

= 1µA, I

LTC3025-2

SENSE

GND

OUT

BIAS

and V

= 50µA Typ

= 0.01µA Typ

30251234 TA01

BIAS

1µF

OUT

≤ 500mA

= 1.2V

DescripTion

The LTC

out) linear regulator which operates from input voltages as

low as 0.9V. The device is capable of supplying 500mA of

output current with a typical dropout voltage of only 85mV.

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 LTC3025-1

features an adjustable output with a low 0.4V reference

while the LTC3025-2, LTC3025-3, and LTC3025-4 have

fixed 1.2V, 1.5V and 1.8V output voltages respectively.

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

6-lead DFN (2mm × 2mm) package.

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. Protected by U.S. Patents including 7224204, 7218082.

VLDO Linear Regulators

3025-X is a micropower, VLDO™ (very low drop-

LTC3025-1/LTC3025-2/

LTC3025-3/LTC3025-4

500mA Micropower

1.2

1MHz V

BIAS = 3.6V

OUT

1.4

= 1.2V

1.6

Supply Rejection

OUT

1.8

OUT

= 10µF

= 1µF

(V)

2.0

2.2

OUT

= 100mA

= 300mA

30251234 TA01b

2.4

2.6

30251234fe

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