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LTC3410

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

Linear Technology 

LTC3410

2.25MHz, 300mA

Synchronous Step-Down

Regulator in SC70

FEATURES

■ High Efficiency: Up to 96%

■ Low Ripple (20mVP-P) Burst Mode Operation: IQ 26µA

■ Low Output Voltage Ripple

■ 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

■ Wireless and DSL Modems

■ Digital Cameras

■ MP3 Players

■ Portable Instruments

DESCRIPTIO

The LTC®3410 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 26µA, dropping to <1µA in shutdown.

The 2.5V to 5.5V input voltage range makes the LTC3410

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

tions. 100% duty cycle provides low dropout operation,

extending battery life in portable systems.

Switching frequency is internally set at 2.25MHz, allowing

the use of small surface mount inductors and capacitors.

The LTC3410 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 LTC3410 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, 6580258, 6304066, 6127815, 6498466, 6611131, 5994885.

TYPICAL APPLICATIO

VIN

2.7V

TO 5.5V

CIN

4.7µF

CER

VIN

SW

LTC3410

RUN

VFB

GND

4.7µH

10pF

887k

412k

3410 TA01a

VOUT

2.5V

COUT

4.7µF

CER

Efficiency and Power Loss

vs Output Current

100

1

90

80

70

EFFICIENCY

0.1

60

50

0.01

40

POWER LOSS

30

20

10

0

0.1

VIN = 2.7V

VIN = 3.6V

VIN = 4.2V

0.001

0.0001

1

10

100

1000

OUTPUT CURRENT (mA)

3410 TA01b

3410fb

1

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