LT1913

1

1913f

25V, 3.5A, 2.4MHz

Step-Down Switching Regulator

The LT

2.4MHz) monolithic buck switching regulator that accepts

input voltages up to 25V. A high efficiency 95m switch

is included on the die along with a boost Schottky diode

and the necessary oscillator, control, and logic circuitry.

Current mode topology is used for fast transient response

and good loop stability. Shutdown reduces input supply

current to less than 1μA while a resistor and capacitor on

the RUN/SS pin provide a controlled output voltage ramp

91% of the programmed output voltage. The LT1913 is

available in 10-Pin 3mm × 3mm DFN packages with ex-

posed pads for low thermal resistance.

■

Automotive Battery Regulation

■

Power for Portable Products

■

Distributed Supply Regulation

■

Industrial Supplies

■

Wall Transformer Regulation

■

Wide Input Range: 3.6V to 25V

■

3.5A Maximum Output Current

■

Adjustable Switching Frequency: 200kHz to 2.4MHz

■

■

Integrated Boost Diode

■

Synchronizable Between 250kHz to 2MHz

■

Power Good Flag

■

Saturating Switch Design: 95m On-Resistance

■

0.790V Feedback Reference Voltage

■

Output Voltage: 0.79V to 25V

■

Thermal Protection

■

Soft-Start Capability

■

Small 10-Pin (3mm × 3mm) DFN Packages

5V Step-Down Converter

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

SW

FB

PG

RT

BD

6.5V TO 25V

5V

3.5A

10μF

0.47μF

680pF

47μF

100k

15k

63.4k

4.7μH

536k

GND

OFF ON

LT1913

1913 TA01a

RUN/SS

BOOST

SYNC

Efficiency

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

All other trademarks are the property of their respective owners.

OUTPUT CURRENT (A)

0

0.5

50

70

100

1

2

2.5

1913 G01

60

90

80

1.5

3

3.5

L = 4.7μH

f = 600kHz