LTC3526L/LTC3526LB

1

3526lfb

550mA 1MHz Synchronous

Step-Up DC/DC Converters

in 2mm × 2mm DFN

The LTC

frequency step-up DC/DC converters with output discon-

nect. Synchronous rectification enables high efficiency in

the low profile 2mm × 2mm DFN package. Battery life in

single AA/AAA powered products is extended further with

a 680mV start-up voltage and operation down to 500mV

once started.

A switching frequency of 1MHz minimizes solution foot-

print by allowing the use of tiny, low profile inductors

and ceramic capacitors. The current mode PWM design

is internally compensated, reducing external parts count.

The LTC3526L features Burst Mode operation at light load

conditions allowing it to maintain high efficiency over a

wide range of load. The LTC3526LB features fixed frequency

operation for low noise applications. Anti-ring circuitry

reduces EMI by damping the inductor in discontinuous

mode. Additional features include a low shutdown current

of under 1μA and thermal shutdown.

The LTC3526L/LTC3526LB are housed in a 2mm × 2mm

× 0.75mm DFN package.

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Medical Instruments

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Noise Canceling Headphones

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Wireless Mice

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Bluetooth Headsets

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Delivers 3.3V at 100mA from a Single Alkaline/

NiMH Cell or 3.3V at 200mA from Two Cells

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Up to 94% Efficiency

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Output Disconnect

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1MHz Fixed Frequency Operation

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Integrated Soft-Start

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Current Mode Control with Internal Compensation

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Burst Mode

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Low Noise PWM Operation (LT3526LB)

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Internal Synchronous Rectifier

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Anti-Ring Control

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Low Profile (2mm × 2mm × 0.75mm)

DFN-6 Package

, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology

Corporation. All other trademarks are the property of their respective owners.

SW

1.78M

1M

3526 TA01a

LTC3526L

SHDN

FB

1.6V TO 3.2V

3.3V

200mA

OFF ON

4.7μH

4.7μF

4.7μF

GND

LOAD CURRENT (mA)

0.01

40

50

60

70

80

0.1

1

10

100

1000

3526 TA01b

30

20

10

0

90

100

1

10

100

0.1

0.01

1000

EFFICIENCY

POWER LOSS

Efficiency and Power Loss vs Load Current

TYPICAL APPLICATION

APPLICATIONS

FEATURES

DESCRIPTION