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LTC3410B

2.25MHz, 300mA Synchronous Step-Down Regulator in SC70

Linear Technology 

FEATURES

■ High Efficiency: Up to 96%

■ 300mA Output Current at VIN = 3V

■ 380mA Minimum Peak Switch Current

■ 2.5V to 5.5V Input Voltage Range

■ 2.25MHz Constant Frequency Operation

■ No Schottky Diode Required

■ Low Dropout Operation: 100% Duty Cycle

■ Stable with Ceramic Capacitors

■ 0.8V Reference Allows Low Output Voltages

■ Shutdown Mode Draws < 1µA Supply Current

■ ±2% Output Voltage Accuracy

■ Current Mode Operation for Excellent Line and

Load Transient Response

■ Overtemperature Protected

■ Available in Low Profile SC70 Package

U

APPLICATIO S

■ Cellular Telephones

■ Personal Information Appliances

■ Wireless and DSL Modems

■ Digital Still Cameras

■ MP3 Players

■ Portable Instruments

LTC3410B

2.25MHz, 300mA

Synchronous Step-Down

Regulator in SC70

DESCRIPTIO

The LTC®3410B is a high efficiency monolithic synchro-

nous buck regulator using a constant frequency, current

mode architecture. The device is available in adjustable

and fixed output voltage versions. Supply current during

operation is only 200µA, dropping to <1µA in shutdown.

The 2.5V to 5.5V input voltage range makes the LTC3410B

ideally suited for single Li-Ion battery-powered applica-

tions. 100% duty cycle provides low dropout operation,

extending battery life in portable systems. PWM pulse

skipping mode operation provides very low output ripple

voltage for noise sensitive applications.

Switching frequency is internally set at 2.25MHz, allowing

the use of small surface mount inductors and capacitors.

The LTC3410B is specifically designed to work well with

ceramic output capacitors, achieving very low output

voltage ripple and a small PCB footprint.

The internal synchronous switch increases efficiency and

eliminates the need for an external Schottky diode. Low

output voltages are easily supported with the 0.8V feed-

back reference voltage. The LTC3410B is available in a

tiny, low profile SC70 package.

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

other trademarks are the property of their respective owners. Protected by U.S. Patents,

including 5481178, 5994885, 6580258, 6304066, 6127815, 6498466, 6611131.

TYPICAL APPLICATIO

VIN

2.7V

TO 5.5V

CIN

2.2µF

CER

VIN

SW

LTC3410B

RUN

VFB

GND

4.7µH

10pF

232k

464k

3410 TA01

VOUT

1.2V

COUT

2.2µF

CER

100

90

80

70

60

50

40

30

20

20

0

1

Efficiency and Power Loss

vs Output Current

1

EFFICIENCY

0.1

0.01

POWER LOSS

0.001

VIN = 2.7V

VIN = 3.6V

VIN = 4.2V 0.0001

10

100

1000

OUTPUT CURRENT (mA)

3410 TA01b

3410bfa

1

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