LTM4608A

1

4608afa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

µModule with Tracking, Margining,

and Frequency Synchronization

The LTM

power supply with ±1.75% total output voltage error. In-

cluded in the package are the switching controller, power

FETs, inductor and all support components. Operating over

an input voltage range of 2.7V to 5.5V, the LTM4608A sup-

ports an output voltage range of 0.6V to 5V, set by a single

external resistor. This high efficiency design delivers up

to 8A continuous current (10A peak). Only bulk input and

output capacitors are needed to complete the design.

The low profile package (2.8mm) enables utilization of

unused space on the back side of PC boards for high

density point-of-load regulation. The 0.630mm LGA pads

with 1.27mm pitch simplify PCB layout by providing stan-

dard trace routing and via placement. The high switching

frequency and current mode architecture enable a very

fast transient response to line and load changes without

sacrificing stability. The device supports frequency syn-

chronization, programmable multiphase and/or spread

spectrum operation, output voltage tracking for supply

rail sequencing and voltage margining.

Fault protection features include overvoltage protection,

overcurrent protection and thermal shutdown. The power

module is offered in a compact and thermally enhanced

15mm × 9mm × 2.8mm surface mount LGA package. The

LTM4608A is Pb-free and RoHS compliant.

3V to 5.5V Input to 1.8V Output DC/DC μModule™

■

Complete Standalone Power Supply

■

±1.75% Total DC Output Error (–55°C to 125°C)

■

2.7V to 5.5V Input Voltage Range

■

8A DC, 10A Peak Output Current

■

0.6V Up to 5V Output

■

Output Voltage Tracking and Margining

■

Power Good Tracks Margining

■

Multiphase Operation

■

Parallel Current Sharing

■

Onboard Frequency Synchronization

■

Spread Spectrum Frequency Modulation

■

Overcurrent/Thermal Shutdown Protection

■

Current Mode Control/Fast Transient Response

■

■

Up to 95% Efficiency

■

Output Overvoltage Protection

■

Small, Low Profile 9mm × 15mm × 2.8mm

LGA Package (0.630mm Pads)

■

Telecom, Networking and Industrial Equipment

■

Storage Systems

■

Point of Load Regulation

, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology

Corporation. μModule is a trademark 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.

SW

RUN

PLLLPF

TRACK

FB

PGOOD

MGN

CLKOUT GND

CLKIN

CLKIN

4.87k

4608A TA01a

100μF

10μF

PGOOD

1.8V

3V TO 5.5V

LTM4608A

SGND

Efficiency vs Load Current

LOAD CURRENT (A)

0

70

75

80

85

90

95

100

246

8

4608A TA01b

10