Linear Technology DC1083A-A LTM4603 Synchronizable 20V, 6A Step-Down μModule Regulator DC1083A-A DC1083A-A データシート

LTM4603/LTM4603-1

1

4603fb

20V, 6A DC/DC µModule  

Regulator with PLL, Output  

Tracking and Margining

n

  Telecom and Networking Equipment

n

 Servers

n

  Industrial Equipment

n

  Point of Load Regulation

n

  Complete Switch Mode Power Supply

n

  Wide Input Voltage Range: 4.5V to 20V

n

  6A DC Typical, 8A Peak Output Current

n

  0.6V to 5V Output Voltage

n

  Output Voltage Tracking and Margining

n

  Remote Sensing for Precision Regulation (LTM4603 

n

  Typical Operating Frequency: 1MHz

n

  PLL Frequency Synchronization

n

  1.5% Regulation

n

  Current Foldback Protection (Disabled at Start-Up)

n

  Pin Compatible with the LTM4601

n

  Pb-Free (e4) RoHS Compliant Package with Gold 

Finish Pads

n

  Ultrafast Transient Response

n

  Current Mode Control

n

  Up to 93% Efficiency at 5V

IN

, 3.3V

OUT

n

  Programmable Soft-Start

n

  Output Overvoltage Protection

n

  Small Footprint, Low Profile (15mm 

× 15mm × 

2.82mm) Surface Mount LGA Package

The LTM

®

4603 is a complete 6A step-down switch mode 

DC/DC µModule

®

 regulator with onboard switching con-

troller, MOSFETs, inductor and all support components. 

The device is housed in a small surface mount 15mm 

× 

15mm 

× 2.82mm LGA package. Operating over an input 

voltage range of 4.5V to 20V, the LTM4603 supports an 

output voltage range of 0.6V to 5V as well as output volt-

age tracking and margining. The high efficiency design 

delivers 6A continuous current (8A peak). Only bulk input 

and output capacitors are needed to complete the design. 
The low profile (2.82mm) and light weight (1.7g) package 

easily mounts on the unused space on the back side of 

PC boards for high density point of load regulation.  The 

µModule regulator can be synchronized with an external 

clock for reducing undesirable frequency harmonics and 

allows PolyPhase

®

 operation for high load currents. 

A high switching frequency and adaptive on-time current 

mode architecture deliver a very fast transient response 

to line and load changes without sacrificing stability. An 

onboard remote sense amplifier can be used to accurately 

regulate an output voltage independent of load current. 

The onboard remote sense amplifier is not available in the 

LTM4603-1. The LTM4603/LTM4603-1 are pin compatible 

with the 12A LTM4601/LTM4601-1.

L

, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered 

trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other 

trademarks are the property of their respective owners.

V

OUT

V

FB

MARG0
MARG1

V

OUT_LCL

DIFFV

OUT

V

OSNS

+

V

OSNS

–

PGOOD

RUN
COMP
INTV

CC

DRV

CC

MPGM

TRACK/SS

PLLIN

LTM4603

ON/OFF

392k

40.2k

MARGIN

CONTROL

C

OUT

4603 TA01a

V

OUT

1.5V

6A

CLOCK SYNC

TRACK/SS CONTROL

100pF

C

IN

V

IN

f

SET

PGND

SGND

5% MARGIN

V

IN

4.5V TO 20V

LOAD CURRENT (A)

0

EFFICIENCY (%) 60

90

95

100

2

4

5

4603 TA01b

50
45

80

70

55

85

40

75

65

1

3

6

7

12V

IN

, 1.2V

OUT

12V

IN

, 1.5V

OUT

12V

IN

, 1.8V

OUT

12V

IN

, 2.5V

OUT

12V

IN

, 3.3V

OUT

12V

IN

, 5V

OUT