LT8334

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Converter with 5A, 40V Switch

The LT®8334 is a current mode DC/DC converter with a

40V, 5A switch operating from a 2.8V to 40V input. With

a unique single feedback pin architecture, it is capable

of boost, SEPIC or inverting configurations. Burst Mode

operation consumes as low as 9μA quiescent current to

maintain high efficiency at very low output currents, while

keeping typical output ripple below 15mV.

An external compensation pin allows optimization of loop

bandwidth over a wide range of input and output volt-

ages and programmable switching frequencies between

300kHz and 2MHz. A SYNC/MODE pin allows synchroni-

zation to an external clock. It can also be used to select

between BURST or PULSE SKIP modes of operation with

spread spectrum frequency modulation for low EMI. For

increased efficiency, a BIAS pin can accept a second input

frequency foldback and programmable soft-start to con-

trol inductor current during start-up.

The LT8334 is available in a thermally enhanced 12-lead

4mm × 3mm DFN package.

APPLICATIONS

n

Wide Input Voltage Range: 2.8V to 40V

n

Ultralow Quiescent Current and Low Ripple Burst

n

5A, 40V Power Switch

n

Positive or Negative Output Voltage Programming

with a Single Feedback Pin

n

Programmable Frequency (300kHz to 2MHz)

n

Sychronizable to an External Clock

n

Spread Spectrum Frequency Modulation for Low EMI

n

Bias Pin for Higher Efficiency

n

Programmable Undervoltage Lockout (UVLO)

n

Overcurrent and Overtemperature Protection

n

Thermally Enhanced 12-Lead 4mm × 3mm DFN

n

Industrial and Automotive

n

Telecom

n

Medical Diagnostic Equipment

n

Portable Electronics

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Efficiency and Power Loss

71.5k

20.0k

2MHz

1M

39k

10µF

10µF

×2

0.1µF

1nF

1µF

2.2µH

4V TO 20V

24V

2A

RT

SS

GND

SYNC/MODE

LT8334

EN/UVLO

BIAS

FBX

SW

8334 TA01a

EFFICIENCY

POWER LOSS

LOAD CURRENT (A)

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0

0

10

20

30

40

50

60

70

80

90

100

0

0.4

0.8

1.2

1.6

2.0

2.4

2.8

3.2

3.6

4.0

8334 TA01b