ltm4615 Linear Technology Corporation, ltm4615 Datasheet

ltm4615

Manufacturer Part Number

ltm4615

Description

Triple Output, Low Voltage Dc/dc ?module Regulator

Manufacturer

Linear Technology Corporation

Datasheet

1.LTM4615.pdf (24 pages)

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FEATURES

APPLICATIONS

Switching Regulators Section—Current Mode Control

VLDO Section

L, LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks of

Linear Technology Corporation. VLDO 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, 6724174.

TYPICAL APPLICATION

OUT1

1.2V

Dual 4A Output Power Supply with 1.5A VLDO™

Short-Circuit and Overtemperature Protection

Power Good Indicators

Input Voltage Range: 2.375V to 5.5V

4A DC Typical, 5A Peak Output Current Each

0.8V Up to 5V Output Each, Parallelable

±2% Total DC Output Error

Output Voltage Tracking

Up to 95% Efﬁ ciency

Programmable Soft-Start

VLDO, 1.14V to 3.5V Input Range

VLDO, 0.4V to 2.6V, 1.5A Output

VLDO, 40dB Supply Rejection at f

±1% Total DC Output Error

Small and Very Low Proﬁ le Package:

15mm × 15mm × 2.82mm

Telecom and Networking Equipment

Industrial Power Systems

Low Noise Applications

FPGA, SERDES Power

22μF

6.3V

1.2V at 4A, 1.5V at 4A and 1V at 1A DC/DC μModule

10k

100μF

6.3V

PGOOD1

10k

10μF

6.3V

10μF

1.2V

PGOOD1

FB1

TRACK1

RUN/SS1

LDO_IN

EN3

OUT1

GND1

IN1

LTM4615

GND2

3V TO 5.5V

GND3

LDO_OUT

IN2

RUN/SS2

PGOOD2

PGOOD3

TRACK2

OUT2

FB2

FB3

10k

10μF

6.3V

PGOOD3

OUT3

1V AT 1A

PGOOD2

OUT3

10k

3.32k

DC/DC µModule Regulator

Regulator

DESCRIPTION

Triple Output, Low Voltage

The LTM

DC/DC power supply plus an additional 1.5A VLDO (very

low dropout) linear regulator. Included in the package are

the switching controllers, power FETs, inductors, a 1.5A

regulator and all support components. The dual 4A DC/DC

converters operate over an input voltage range of 2.375V

to 5.5V, and the VLDO operates from a 1.14V to 3.5V input.

The LTM4615 supports output voltages ranging from 0.8V

to 5V for the DC/DC converters, and 0.4V to 2.6V for the

VLDO. The three regulator output voltages are set by a

single resistor for each output. Only bulk input and output

capacitors are needed to complete the design.

The low proﬁ le package (2.82mm) 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 enables a very fast transient

response to line and load changes without sacriﬁ cing

stability. The device supports output voltage tracking for

supply rail sequencing.

Additional features include overvoltage protection,

foldback overcurrent protection, thermal shutdown and

programmable soft-start. The power module is offered in

a space saving and thermally enhanced 15mm × 15mm

× 2.82mm LGA package. The LTM4615 is Pb-free and

RoHS compliant.

10μF

6.3V

100μF

5.76k

6.3V

4615 is a complete 4A dual output switching mode

4615 TA01a

22μF

6.3V

1.5V

OUT2

Efﬁ ciency vs Output Current

= 3.3V

OUT3

= 1.2V)

LOAD CURRENT (A)

LTM4615

OUT1

1.2V

1.5V

OUT2

4615 TA01b

4615f

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