LTM4604A

1

4604af

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Low Voltage, 4A DC/DC

µModule with Tracking

The LTM

power supply with ±1.75% total output voltage error.

Included in the package are the switching controller, power

FETs, inductor and all support components. Operating over

an input voltage range of 2.375V to 5.5V, the LTM4604A

supports an output voltage range of 0.8V to 5V, set by a

single resistor. This high efficiency design delivers up to

4A continuous current (5A peak). Only bulk output capaci-

tors are needed to complete the design.

The 0.630mm LGA pads with 1.27mm pitch simplify

PCB layout by providing standard trace routing and via

placement. (The LTM4604A has smaller pads than the

LTM4604.) The low profile package (2.3mm) enables

utilization of unused space on the bottom of PC boards

for high density point of load regulation. High switching

frequency and a current mode architecture enable a very

fast transient response to line and load changes without

sacrificing stability.

Fault protection features include foldback current protec-

tion, thermal shutdown and a programmable soft-start

function. The LTM4604A is offered in a small thermally

enhanced 15mm × 9mm × 2.3mm LGA package and is

Pb free and RoHS compliant.

3.3V to 2.5V/4A μModule™ Regulator

■

Complete Standalone Power Supply

■

±1.75% Total DC Output Error (–40°C to 125°C)

■

Wide Input Voltage Range: 2.375V to 5.5V

■

4A DC, 5A Peak Output Current

■

0.8V to 5V Output

■

Output Voltage Tracking

■

■

Power Good Indicator

■

Current Mode Control

■

Current Foldback Protection, Parallel/Current Sharing

■

Up to 95% Efficiency

■

Programmable Soft-Start

■

■

Overtemperature Protection

■

Small and Very Low Profile Package:

15mm × 9mm × 2.3mm LGA (0.630mm Pads)

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Telecom and Networking Equipment

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Servers

■

Storage Cards

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ATCA Cards

■

Industrial Equipment

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

μModule and UltraFast are trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

3.3V

PGOOD

COMP

LTM4604A

RUN/SS

2.37k

4604A TA01a

22μF

6.3V

×2

2.5V

4A

10μF

6.3V

FB

TRACK

GND

OUTPUT CURRENT (A)

0

85

90

100

3

4604A TA01b

80

75

12

4

70

65

95

Efficiency vs Output Current