LTC3458L Linear Technology, LTC3458L Datasheet

LTC3458L

Manufacturer Part Number

LTC3458L

Description

1.7A/ 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

Manufacturer

Linear Technology

Datasheet

1.LTC3458L.pdf (16 pages)

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FEATURES

3.1V TO 4.2V

■

TYPICAL APPLICATIO

APPLICATIO S

High Efficiency: Up to 95%

Inrush Current Limiting and Output Disconnect

Programmable Output Voltages up to 6V

1.5V to 6V Input Range

Programmable/Synchronizable Fixed Frequency

Operation up to 1.5MHz

Programmable Automatic Burst Mode

Current Mode Control with Programmable Soft-Start

Period and Peak Current Limit

0.2Ω N-Channel and 0.3Ω P-Channel Switches

Ultralow Quiescent Currents: 12µA Sleep, <1µA in

Shutdown

12-Pin 4mm × 3mm Thermally Enhanced DFN

Package

Point-of-Load Regulators

USB V

Portable GPS

MP3 Players

Li Ion

BUS

2.2µF

200k

Power

ON OFF

84.5k

GND/PGND

SHDN

SYNC

LIM

Li-Ion to 5V at 1MHz

LTC3458L

7.4µH

BURST

COMP

OUT

133k

0.01µF

Operation

0.01µF

33k

10pF

560pF

DESCRIPTIO

Step-Up DC/DC Converter

The LTC

frequency, step up DC/DC converter with true output

disconnect and inrush current limiting. The LTC3458L is

rated for up to 6V output and includes a 0.2Ω N-channel

MOSFET switch and a 0.3Ω P-channel MOSFET synchro-

nous rectifier. The LTC3458L is well suited for battery

powered applications and includes programmable output

voltage, switching frequency and loop compensation. The

oscillator frequency can be set up to 1.5MHz or synchro-

nized to an external clock.

Quiescent current is only 12µA during Burst Mode opera-

tion maximizing battery life in portable applications. The

Burst Mode current threshold, peak current limit, and soft-

start are externally programmable. Other features include

<1µA shutdown current, antiringing control, and thermal

limit. The LTC3458L is available in a low profile (0.75mm),

4mm × 3mm 12-pin DFN package.

Burst Mode is a registered trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 5481178, 6304066, 6580258, 5511131, 6498466

1.7A, 1.5MHz Synchronous

3458L TA01a

324k

, LTC and LT are registered trademarks of Linear Technology Corporation.

with Output Disconnect

22µF

X5R

750mA

3458L is a high efficiency, current mode, fixed

OUT

100

0.1

Li-Ion to 5V

LOAD CURRENT (mA)

3.6V

4.2V

www.DataSheet4U.com

POWER

LOSS

LTC3458L

3.1V

OUT

100

3458L TA01b

1000

100

0.1

3458lf

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