LTC3672B-2 datasheet(1/12 Pages) LINER

Part #	LTC3672B-2

Description	Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs

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Manufacturer	LINER [Linear Technology]

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LTC3672B-2

1

3672b2fa

n Triple Output Supply From a Single 2.9V to 5.5V Input

n Buck DC/DC: Fixed 1.2V Output, Up to 400mA

n LDO1: Fixed 2.8V Output, Up to 150mA

n LDO2: Fixed 1.8V Output, Up to 150mA

n ±2.5% Reference Accuracy

n Constant-Frequency 2.25MHz Operation

n Minimum External Component Count

n Current Mode Operation for Excellent Line and Load

Transient Response

n Internal Soft-Start for Each Output

n Single Enable Pin Turns On/Shuts Down All Three

Outputs

n Tiny 2mm

× 2mm × 0.75mm DFN Package

ILOAD (mA)

0

80

90

400

70

60

100

200

300

50

150

250

350

100

75

85

65

95

3672B2 TA01b

VIN = 2.9V

VIN = 5.5V

VIN = 3.6V

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Monolithic Fixed-Output

400mA Buck Regulator with Dual

150mA LDOs in 2mm

× 2mm DFN

The LTC®3672B-2 is a triple power supply composed of

a 400mA synchronous buck regulator and two 150mA

low-dropout linear regulators (LDOs). Constant-frequency

2.25MHz operation is maintained down to very light loads.

The input supply range of 2.9V to 5.5V is especially well-

suited for single-cell Lithium-Ion and Lithium-Polymer

applications, and for powering low voltage ASICs from

3.3V or 5V rails.

The LTC3672B-2 regulates 1.2V at the buck output, 2.8V

at the LDO1 output, and 1.8V at the LDO2 output. Exter-

nal component count is minimal—all that is needed is a

single inductor, an input capacitor, and output capacitors

for each of the three outputs. Control loop compensation

is internal to the LTC3672B-2.

The LTC3672B-2 is available in a 2mm

× 2mm × 0.75mm

8-Lead DFN package.

Buck DC/DC Efﬁciency vs Buck Load

n DMB and DVB-H Cellphones

n Handheld Products (PDA, PMP, GPS)

n Multivoltage Power for Digital Logic, I/O, FPGAs,

CPLDs, ASICs, CPUs, and RF Chipsets

LTC3672B-2

GND

ENALL

SW

VOUT2

2.8V, UP TO 150mA

(SUBJECT TO DROPOUT

LIMITATIONS)

VOUT1

1.2V

400mA

VIN

2.9V TO 5.5V

VOUT3

1.8V

150mA

ENABLE

INPUT

BUCKOUT

VIN VIN1

LDO1

LDO2

3672B2 TA01

1μF

4.7μF

4.7μH

2.2μF

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

All other trademarks are the property of their respective owners.

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LTC3672B-2 Datasheet(PDF) 1 Page - Linear Technology

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