LT8338

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

40V, 1.2A Micropower Synchronous

Boost Converter with PassThru

The LT®8338 is a synchronous monolithic step-up reg-

ulator that provides high efficiency for input and output

up to 40V. It consumes only 6µA quiescent current at

Burst Mode operation to maintain high efficiency at very

low output current, while keeping the output ripple below

an external resistor over the range of 300kHz to 3MHz.

A SYNC/MODE pin allows synchronization to an external

clock. It can also be used to select between Burst Mode

operation and pulse-skipping mode, or to enable spread

spectrum modulation to reduce EMI. The EN/UVLO pin

has an accurate 1V threshold and can be used to program

foldback and internal soft-start for inductor current con-

trol during start-up.

8V to 16V Input, 36V Output Micropower Synchronous Boost Converter

APPLICATIONS

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Wide Input Voltage Range: 3.0V to 40V

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Synchronous Operation for High Efficiency

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Monolithic 40V, 240mΩ Power Switches

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100% Duty Cycle PassThru™ Mode for Boost

Preregulation Applications

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Adjustable and Synchronizable: 300kHz to 3MHz

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Spread Spectrum for Reduced EMI/EMC Emissions

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Accurate EN/UVLO

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Internal Compensation

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20MΩ Internal Feedback Divider

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Output Voltage Up to 40V

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Available in 10-Lead MSOP Package

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AEC-Q100 Automotive Qualification in Progress

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Industrial and Automotive Power Supplies

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Battery-Powered Systems

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General Purpose Step-Up

Efficiency

EFFICIENCY

POWER LOSS

LOAD CURRENT (mA)

1

10

100

1k

0

10

20

30

40

50

60

70

80

90

100

0

1

2

3

4

8338 TA01b

(36V)

10µH

EN/UVLO

SW

SYNC/MODE

CTRL

BST

GND

RT

LT8338

0.1µF

301k

1M

2.2µF

2.2µF

4.7µF

1M

0.01µF

162k

8338 TA01a

40.2k

2.20MHz

(8V TO 16V)

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