LTC3526/LTC3526B



3526bfd

Typical applicaTion

applicaTions

FeaTures

DescripTion

500mA 1MHz Synchronous

Step-Up DC/DC Converters

in 2mm

× 2mm DFN

step-up DC/DC converters with output disconnect. Syn-

chronous rectification enables high efficiency in the low

profile 2mm

× 2mm DFN package. Battery life in single

AA/AAA powered products is extended further with an

850mV 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

internallycompensated,reducingexternalpartscount.The

LTC3526 features automatic Burst Mode operation at light

load conditions, while the LTC3526B features continuous

switching at light loads. Anti-ringing control circuitry also

reduces EMI concerns by damping the inductor in discon-

tinuous mode. Additional features include a low shutdown

current of under 1µA and thermal shutdown.

The LTC3526/LTC3526B are housed in a 2mm

× 2mm ×

0.75mm DFN package.

For new designs, we recommend the LTC3526L/LTC3526LB.

L

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

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

property of their respective owners.

n

Medical Instruments

n

Flash-Based MP3 Players

n

Noise Canceling Headphones

n

Wireless Mice

n

Bluetooth Headsets

n

Delivers 3.3V at 100mA from a Single Alkaline/

NiMH Cell or 3.3V at 200mA from Two Cells

n

n

n

Up to 94% Efficiency

n

Output Disconnect

n

1MHz Fixed Frequency Operation

n

n

Integrated Soft-Start

n

Current Mode Control with Internal Compensation

n

Quiescent Current (LTC3526)

n

Low Noise PWM Operation (LTC3526B)

n

Internal Synchronous Rectifier

n

n

Anti-Ringing Control

n

Low Profile (2mm

× 2mm × 0.75mm) DFN Package

SW

1.78M

4.7µH

1M

1µF

4.7µF

3526 TA01a

LTC3526

SHDN

FB

1.6V TO 3.2V

3.3V

200mA

OFF ON

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

LTC3526 Efficiency and Power Loss vs Load Current

NOT RECOMMENDED FOR NEW DESIGNS

Contact Linear Technology for Potential Replacement