LTC3624/LTC3624-2

1

36242fc

For more information www.linear.com/LTC3624

Typical applicaTion

FeaTures

DescripTion

17V, 2A Synchronous

Step-Down Regulator with

3.5µA Quiescent Current

The LTC®3624/LTC3624-2 is a high efficiency 17V, 2A

synchronous monolithic step-down regulator. The switch-

ing frequency is fixed to 1MHz (LTC3624) or 2.25MHz

(LTC3642-2) with a ±40% synchronization range. The

regulator features ultralow quiescent current and high

The step-down regulator operates from an input voltage

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

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

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

Burst Mode operation provides the highest efficiency at

lightloads,whilepulse-skippingmodeprovidesthelowest

voltage ripple. The MODE pin can also be used to sync the

switching frequency to an external clock.

Efficiency and Power Loss vs Load

applicaTions

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95% Max Efficiency

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Constant Frequency (1MHz/2.25MHz)

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Low Dropout Operation (100% Duty Cycle) with

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2A Rated Output Current

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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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Synchronizable to External Clock

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Operation

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Internal Compensation and Soft-Start

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Overtemperature Protection

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Compact 8-Lead DFN (3mm

× 3mm) Package

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Battery Powered Equipment

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Portable Instrumentation

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Emergency Radios

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General Purpose Step-Down Supplies

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, 6177787, 5705919, 5847554, 6703692.

LTC3624/LTC3624-2 Options

PART NAME

FREQUENCY

LTC3624

1MHz

Adjustable

LTC3624-3.3

1MHz

3.3V

LTC3624-5

1MHz

5V

LTC3624-2

2.25MHz

Adjustable

LTC3624-23.3

2.25MHz

3.3V

LTC3624-25

2.25MHz

5V

LOAD CURRENT (A)

0

0

10

30

40

50

100

70

0.5

1

3624 TA01b

20

80

90

60

0

0.2

0.4

0.6

1.2

1.0

0.8

1.5

2

BURST MODE OPERATION

FREQ = 1MHz

2.2µF

47µF

36242 TA01a

3.3µH

5V

2A

RUN

SW

5.6V TO 17V

LTC3624-5

GND

FB

MODE/SYNC

10µF