LTC3622/

LTC3622-2/LTC3622-23/5

1

3622fa

For more information www.linear.com/LTC3622

Typical applicaTion

FeaTures

DescripTion

17V, Dual 1A

Synchronous Step-Down Regulator

with Ultralow Quiescent Current

The LTC®3622 is a dual 1A output, high efficiency synchro-

nousmonolithicstep-downregulatorcapableofoperating

from input supplies up to 17V. The switching frequency is

fixed to 1MHz or 2.25MHz with a ±50% synchronization

range to an external clock. The regulator features ultralow

quiescent current and high efficiency over a wide output

voltage range.

The step-down regulators operate from an input voltage

range of 2.7V to 17V and provide an adjustable output

rent. A user-selectable mode input is provided to allow

the user to trade off ripple noise for light load efficiency.

lightloads,whilepulse-skippingmodeprovidesthelowest

ripplenoise.Theswitchingregulatorscanbesynchronized

available to eliminate the external feedback resistors.

Efficiency vs Load Current

applicaTions

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Dual Step-Down Outputs: 1A Per Channel

n

n

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Up to 95% Efficiency

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High Efficiency, Low Dropout Operation

(100% Duty Cycle)

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Constant Frequency (1MHz/2.25MHz) with External

Frequency Synchronization

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±1% Output Voltage Accuracy

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Current Mode Operation for Excellent Line and Load

Transient Response

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Phase Shift Programmable with External Clock

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Selectable Current Limit

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Internal Compensation and Soft-Start

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Compact 14-Pin DFN (3mm

×4mm) and 16-Lead

MSOP Packages

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Battery Powered Systems

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Point-of-Load Supplies

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Portable – Handheld Scanners

L

, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks

and Hot Swap 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,

6498466, 6611131, 5705919.

List of LTC3622 Options

PART NAME

FREQUENCY

LTC3622

1.00MHz

Adjustable

LTC3622-2

2.25MHz

Adjustable

LTC3622-23/5

2.25MHZ

5V/3.3V

LOAD CURRENT (A)

3622 TA01b

90

80

100

70

60

50

40

30

20

10

0

0.5

0.4

0.6

0.3

0.2

0.1

0

0.0001

0.001

0.01

0.1

1

BURST MODE OPERATION

22pF

619k

84.5k

6.8µH

4.7µH

3622 TA01

RUN1

RUN2

GND

FB1

SW1

5.5V TO 17V

5V

1A

22µF

10µF

C1

1µF

PHASE

MODE/SYNC

SW2

FB2

LTC3622

22pF

619k

196k

2.5V

1A

22µF