LTM4712

1

Rev. 0

For more information www.analog.com

Document Feedback

TYPICAL APPLICATION

FEATURES

DESCRIPTION

36VIN, 12A Step-Up/Step-Down

Buck-Boost µModule Regulator

The LTM®4712 is a high efficiency buck-boost µMod-

ule® (micromodule) regulator. The switching controller,

power switches, inductor and support components are

included in the package. The complete design requires

only a few external components, including a resistor to

set frequency, a resistor to set output voltage, input, and

output capacitors, a sensing resistor to achieve input or

output average current regulation. The LTM4712 operates

over a 5V to 36V input voltage range and can regulate

output voltages between 1V and 36V.

The LTM4712 supports selectable forced continuous

mode (FCM)/pulse-skipping mode (PSM) operation. The

current mode control enables a fast transient response

to line and load changes without sacrificing stability. The

SYNC input and CLKOUT output allow easy synchroniza-

tion. It supports multi-phase parallel operation for high

power applications.

The LTM4712 is offered in a 16mm × 16mm × 8.34mm

ball grid array (BGA) package suitable for automated

assembly by standard surface mount equipment. The

LTM4712 is RoHS-compliant.

12VOUT from 5VIN to 36VIN Buck-Boost Regulator

APPLICATIONS

n

Complete Buck-Boost Switch Mode Power Supply

n

VOUT Equal, Greater, Less Than VIN

n

Wide Input Voltage Range: 5V to 36V

n

Wide Output Voltage Range: 1V to 36V

n

12A in Buck and Buck-Boost Mode, 6A under 12VIN

and 24VOUT

n

Up to 98% Efficiency

n

Peak Current Mode Control

n

Adjustable Input or Output Average Current Limits

n

Input or Output Current Monitoring

n

Power Good Output Signal

n

Parallelable for Increased Output Current

n

Phase-Lockable Fixed Frequency: 100kHz to 600kHz

n

Selectable Forced Continuous/Pulse-Skipping Modes

n

VOUT is Disconnected from VIN During Shutdown

n

16mm ×16mm × 8.34mm BGA Package

n

Telecom, Servers and Networking Equipment

n

Industrial Control

n

High Power Battery-Operated Devices

All registered trademarks and trademarks are the property of their respective owners.

100µF

×3

10µF

×4

0.1µF

140k

9.09k

LTM4712

VIN

RUN

SS

MODE

SYNC

VOUT

FB

PHMODE

COMPa

VOUT

12V,

UP TO

12A

VIN

5V TO 36V

FREQ

GND

ISP

ISN

COMPb

INTVCC

EXTVCC

4712 TA01a

2.2µF

PINS NOT USED

IN THIS CIRCUIT:

CLKOUT

IMON

ISET

PGOOD

Efficiency and Power Loss vs VIN

INPUT VOLTAGE (V)

8

12

16

20

24

28

32

36

91

92

93

94

95

96

97

98

2

4

5

7

8

10

12

13

15

16

18

4712 TA01b

POWER LOSS

EFFICIENCY

VOUT = 12V