LTC3413

1

3413fc

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

3A, 2MHz Monolithic

Synchronous Regulator for

DDR/QDR Memory Termination

The LTC

nous step-down DC/DC converter utilizing a constant

frequency, current mode architecture. It operates from

an input voltage range of 2.25V to 5.5V and provides a

or sinking up to 3A of output current. An internal voltage

divider reduces component count and eliminates the need

for external resistors by dividing the reference voltage in

half. The internal synchronous power switch with 85mΩ

on-resistance increases efficiency and eliminates the need

for an external Schottky diode. Switching frequencies up

to 2MHz are set by an external resistor.

Forced-continuous operation in the LTC3413 reduces

noise and RF interference. Fault protection is provided

by an overcurrent comparator that limits output current

during both sourcing and sinking operations. Adjustable

compensation allows the transient response to be optimized

over a wide range of loads and output capacitors.

Figure 1a. High Efficiency Bus Termination Supply

, 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.

SSTL, HSTL, ...

PGOOD

SW

22μF

4.7M

309k

L1: VISHAY DALE IHLP-2525CZ-01 0.47

2.5V

100μF

2

3413 F01a

1.25V

±3A

L1

0.47μH

LTC3413

PGND

RUN/SS

SGND

330pF

2200pF

5.11k

Figure 1b. Efficiency vs Load Current

LOAD CURRENT (A)

0.01

40

50

60

70

80

0.1

1

10

3413 F01b

30

20

10

0

90

100

f = 1MHz