LTC3528-2 데이터 시트보기 (PDF) - Linear Technology

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LTC3528-2

1A, 2MHz Synchronous Step-Up DC/DC Converter in 2mm × 3mm DFN

Linear Technology 

FEATURES

n Delivers 3.3V at 200mA from a Single Alkaline/

NiMH Cell or 3.3V at 400mA from Two Cells

n VIN Start-Up Voltage: 700mV

n 0.50V to 5.5V Input Range

n 1.6V to 5.25V VOUT Range

n Up to 94% Efficiency

n Output Disconnect

n 2MHz Fixed Frequency Operation

n VIN > VOUT Operation

n Integrated Soft-Start

n Current Mode Control with Internal Compensation

n Burst Mode® Operation with 12µA Quiescent Current

n Internal Synchronous Rectifier

n Logic Controlled Shutdown: <1µA

n Anti-Ringing Control

n Low Profile (2mm × 3mm × 0.75mm) DFN Package

APPLICATIONS

n Medical Instruments

n Noise Canceling Headphones

n Wireless Mice

n Bluetooth Headsets

LTC3528-2

1A, 2MHz Synchronous

Step-Up DC/DC Converter

in 2mm × 3mm DFN

DESCRIPTION

The LTC®3528-2 is a synchronous, fixed frequency step-up

DC/DC converter with output disconnect. High efficiency

synchronous rectification, in addition to a 700mV start-

up voltage and operation down to 500mV once started,

provides longer run-time for single or multiple cell battery-

powered products.

A switching frequency of 2MHz minimizes solution foot-

print by allowing the use of tiny, low profile inductors

and ceramic capacitors. The current mode PWM is inter-

nally compensated, simplifying the design process. The

LTC3528-2 enters Burst Mode operation at light loads.

Anti-ringing circuitry reduces EMI by damping the induc-

tor in discontinuous mode. Additional features include a

low shutdown current, open-drain power good output,

short-circuit protection and thermal overload protection.

The LTC3528-2 is offered in an 8-lead 2mm × 3mm ×

0.75mm DFN package.

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

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

property of their respective owners.

TYPICAL APPLICATION

2.2µH

VIN

1.8V TO 3.2V

4.7µF

OFF ON

SW

VIN

VOUT

LTC3528-2

PGOOD FB

SHDN

GND

499k

287k

68pF

VOUT

3.3V

400mA

10µF

35282 TA01a

Efficiency and Power Loss

100

VOUT = 3.3V

90 VIN = 2.4V

80

EFFICIENCY

70

1000

100

60

10

50

40

1

POWER LOSS

30

20

0.1

10

0

0.01

0.01 0.1

1

10 100 1000

LOAD CURRENT (mA)

35282 TA01b

35282fb

1

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