LT8390A

1

8390afa

For more information www.linear.com/LT8390A

TYPICAL APPLICATION

FEATURES

DESCRIPTION

60V 2MHz Synchronous

4-Switch Buck-Boost Controller

with Spread Spectrum

TheLT®8390Aisasynchronous4-switchbuck-boostDC/DC

controller that regulates output voltage, input or output

current from an input voltage above, below, or equal to

the output voltage. The proprietary peak-buck peak-boost

current mode control scheme allows adjustable and syn-

chronizable 600kHz to 2MHz fixed frequency operation, or

internal 25% triangle spread spectrum frequency modula-

tion for low EMI. With a 4V to 60V input voltage range, 0V

to 60V output voltage capability, and seamless low noise

transitionsbetweenoperationregions,theLT8390Aisideal

for voltage regulator, battery and supercapacitor charger

applications in automotive, industrial, telecom, and even

battery-powered systems.

The LT8390A provides input or output current monitor

and power good flag. Fault protection is also provided to

detect output short-circuit condition, during which the

LT8390A retries, latches off, or keeps running.

95% Efficient 48W (12V 4A) 2MHz Buck-Boost Voltage Regulator

APPLICATIONS

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Up to 95% Efficiency at 2MHz

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Proprietary Peak-Buck Peak-Boost Current Mode

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±3% Input or Output Current Accuracy with Monitor

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Spread Spectrum Frequency Modulation for Low EMI

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High Side PMOS Load Switch Driver

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No Top MOSFET Refresh Noise in Buck or Boost

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Adjustable and Synchronizable: 600kHz to 2MHz

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Available in 28-Lead TSSOP with Exposed Pad and

28-Lead QFN (4mm × 5mm)

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Automotive, Industrial, Telecom Systems

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High Frequency Battery-Powered System

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog

Devices, Inc. All other trademarks are the property of their respective owners.

CONTINUOUS OPERATION WITH

HIGHEST COMPONENT TEMPERATURE

INPUT VOLTAGE (V)

0

5

10

15

20

25

30

35

40

50

60

70

80

90

100

8390a TA01b

169k

22nF

0.1µF

0.1µF

22µF

383k

4.7µF 100k

0.47µF

59.0k

2.2nF

10k

110k

10k

0.1µF

133k

100k

0.1µF

1µF

1µF

1µH

1µF

10

10

22µF

22µF

4.7µF

5m

10m

EN/UVLO

CTRL

PGOOD

BG2

BST2

TG2

LOADEN

FB

ISP

ISN

SYNC/SPRD

TEST

6V TO 28V

CONTINUOUS

4V TO 56V

TRANSIENT

2MHz

63V

100V

×2

16V

×2

ISMON

PGOOD

16V

12V

4A

LSP

LSN

SW1

SW2

BST1

TG1

BG1

LT8390A

LOADTG

ISMON

SS

RT

GND

SSFM OFF

SSFM ON

16V

×2

100V

×2

8390a TA01a