LT8619/LT8619-5

1

8619f

For more information www.linear.com/LT8619

TYPICAL APPLICATION

FEATURES

DESCRIPTION

60V, 1.2A Synchronous Monolithic Buck

Regulator with 6µA Quiescent Current

The LT®8619 is a compact, high efficiency, high speed

synchronous monolithic step-down switching regulator

that consumes only 6μA of quiescent current. The LT8619

can deliver 1.2A of continuous current. Top and bottom

power switches are included with all necessary circuitry

to minimize the need for external components. Low ripple

very low output currents while keeping the output ripple

operation synchronized to an external clock. Internal com-

pensation with peak current mode topology allows the use

of small inductors and results in fast transient response

and good loop stability. The EN/UV pin has an accurate 1V

lockout or to shut down the LT8619, reducing the input

supply current to below 0.6μA. The PG flag signals when

The LT8619 is available in a small 16-lead MSOP and

10-lead 3mm × 3mm DFN packages with exposed pad

for low thermal resistance.

APPLICATIONS

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Wide Input Voltage Range: 3V to 60V

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Fast Minimum Switch-On Time: 30ns

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Ultralow Quiescent Current Burst Mode Operation:

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Synchronizable/Programmable Fixed Frequency

Forced Continuous Mode Operation: 300kHz

to 2.2MHz

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High Efficiency Synchronous Operation:

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Low Dropout: 360mV at 0.5A

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Low EMI

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Accurate 1V Enable Pin Threshold

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Internal Soft-Start and Compensation

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Power Good Flag

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Small Thermally Enhanced 16-Lead MSOP Package

and 10-Lead (3mm × 3mm) DFN Packages

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12V Automotive Systems

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12V and 24V Commercial Vehicles

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48V Electric and Hybrid Vehicles

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Industrial Supplies

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

5V, 1.2A Step-Down Converter

L = 10µH, IHLP-2020BZ-01

= 48V

= 24V

= 12V

Burst Mode

OPERATION

EFFICIENCY

f

LOAD CURRENT (mA)

0.001 0.01 0.1

1

10

100

1k

10k

0

10

20

30

40

50

60

70

80

90

100

0.0001

0.001

0.01

8619 TA01b

0.1

1

10

POWER LOSS

LT8619-5

10µH

66.5k

OFF ON

0.1µF

22µF

8619 TA01a

1µF

2.2µF

6V TO 60V

5V

1.2A

BST

SW

BIAS

PG

OUT

GND

SYNC

EN/UV

RT

PG

100k

L = VISHAY IHLP-2020BZ-01