LTC3458LEDE View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC3458LEDE

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

Linear Technology 

FEATURES

■ 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® Operation

■ 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

U

APPLICATIO S

■ Point-of-Load Regulators

■ USB VBUS Power

■ Portable GPS

■ MP3 Players

LTC3458L

1.7A, 1.5MHz Synchronous

Step-Up DC/DC Converter

with Output Disconnect

DESCRIPTIO

The LTC®3458L is a high efficiency, current mode, fixed

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.

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

other trademarks are the property of their respective owners. Burst Mode is a registered

trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178,

6580258, 6304066, 6127815, 6498466, 6611131.

TYPICAL APPLICATIO

Li-Ion to 5V at 1MHz

7.4μH

Li Ion

3.1V TO 4.2V

2.2μF

VIN

SW

LTC3458L

GND/PGND

VOUT

ON OFF

SHDN

FB

SYNC

RT

ILIM

200k 84.5k

COMP

SS

BURST

0.01μF

0.01μF

133k

VOUT

5V

10pF

750mA

1M

33k

10pF

324k

22μF

X5R

560pF

3458L TA01a

100

95

90

85

80

75

70

65

60

0.1

Li-Ion to 5VOUT

1000

4.2VIN

3.1VIN

100

3.6VIN

10

POWER

LOSS

1

1

10

100

LOAD CURRENT (mA)

0.1

1000

3458L TA01b

3458lfa

1

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