LTC3535

1

3535fa

TYPICAL APPLICATION

DESCRIPTION

Dual Channel 550mA 1MHz

Synchronous Step-Up

DC/DC Converter

quency step-up DC/DC converter with output disconnect.

Extended battery life in single AA/AAA powered products

is realized 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 LTC3535 features Burst Mode operation at light load

conditions allowing it to maintain high efficiency over a

wide range of load. 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 LTC3535 is housed in a 3mm

× 3mm × 0.75mm

DFN package.

Efficiency vs Load Current

FEATURES

APPLICATIONS

n

Medical Instruments

n

Noise Canceling Headphones

n

Energy Harvesting

n

Bluetooth Headsets

n

Two Independent Step-Up Converters

n

Each Channel 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

n

Internal Synchronous Rectifier

n

n

Anti-Ring Control

n

Low Profile (3mm

× 3mm × 0.75mm)

12-Lead DFN Package

LOAD CURRENT (mA)

0.01

50

70

80

90

1000

3535 TA01b

20

30

40

60

0

10

0.1

1

10

100

100

3535 TA01

OFF ON

OFF ON

4.7µH

0.8V

TO 1.5V

1.8V

100mA

3.3V

50mA

10µF

10µF

511k

2.2µF

4.7µH

1M

1.78M

1M

SW1

LTC3535

FB1

FB2

SW2

GND

GND

SHDN1

SHDN2

L

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

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.