LTC7124

1

7124fa

For more information www.linear.com/LTC7124

TYPICAL APPLICATION

FEATURES

DESCRIPTION

17V, Dual 3.5A Synchronous Step-Down

Regulator with Ultralow Quiescent Current

The LTC®7124 is a dual channel, 3.5A per output, high

efficiency monolithic step-down regulator capable of

operating from input supplies up to 17V. The program-

mable switching frequency ranges from 500kHz to 4MHz

with a ±25% external clock synchronization capability

aroundtheprogrammedfrequency.Theregulatorfeatures

ultralow quiescent current for high efficiency over a wide

The step-down regulator operates from an input voltage

range of 3.1V to 17V and provides an adjustable output

ofoutputcurrentperchannel.Auserselectablemodeinput

is provided to allow the user to trade off output ripple for

highest efficiency at light loads, while forced continuous

operation provides the lowest output ripple. The LTC7124

includesspreadspectrummodulationforlowradiatedand

conductive noise. The LTC7124 is offered in a thermally

enhanced, low profile 24-lead 3mm × 5mm QFN package

Efficiency & Power Loss

vs Load Current at 1MHz

1.8V/3.3V 1MHz Step-Down Regulator

APPLICATIONS

n

n

n

Dual Step-Down Outputs: 3.5A Per Channel

n

Integrated 80mΩ/40mΩ N-Channel MOSFETs

Provide Up to 95% Efficiency

n

n

Programmable Frequency (500kHz to 4MHz) with

±25% Frequency Synchronization Range

n

Configurable for a 2-Phase Single Output at Up to 7A

n

±1.0% Output Voltage Accuracy

n

Current Mode Operation for Excellent Line and Load

Transient Response

n

Internal or Programmable External Loop Compensation

n

Available in a 3mm × 5mm QFN-24 Package

n

Battery-Powered Systems

n

Point-of-Load Supplies

n

Portable Instruments

n

Handheld Scanners

47µF

2.2µF

100k

0.1µF

100µF

R3

619k

R4

137k

1.8µH

16pF

0.1µF

100µF

R1

619k

R2

309k

1.2µH

22pF

LTC7124

7124 TA01

RUN1

RUN2

ILIM

GND

FB1

FB2

SW1

SW2

BOOST1

BOOST2

ITH1

ITH2

RT

MODE/SYNC

1.8V AT 3.5A

3.3V AT 3.5A

10.8V TO 13.2V

x2

LOAD CURRENT (A)

0

0.5

1

1.5

2

2.5

3

3.5

0

10

20

30

40

50

60

70

80

90

100

0

0.4

0.8

1.2

1.6

7124 TA01a

L

, LT, LTC, LTM, Burst Mode, Linear Technology, the Linear logo, LTpowerCAD and LTspice

are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their

respective owners. Protected by U.S. Patents, including 5481178, 6580258, 6498466, 6611131,

6177787, 5705919, 5847554.