LT8350

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Buck-Boost Silent Switcher

The LT®8350 is a monolithic 4-switch synchronous buck-

boost converter with Silent Switcher architecture to mini-

mize EMI emissions while delivering high efficiency at

high switching frequency. The switcher can regulate the

output voltage, input or output current from input volt-

ages above, below, or equal to the output voltage. The

proprietary peak current mode control scheme allows

adjustable and synchronizable 200kHz to 2MHz fixed fre-

quency operation, or spread spectrum frequency modu-

lation (SSFM) operation. With 3V to 40V input voltage

range, 1V to 18V output voltage capability, and seam-

less low noise transitions between operation regions, the

LT8350 is ideal for voltage regulator, battery and super-

capacitor charger applications in automotive, industrial,

telecom, and battery powered systems.

The LT8350 provides input or output current monitor and

power good flag. Robust fault protection is provided to

detect output short-circuit condition, during which the

LT8350 retries, latches off, or keeps running.

95% Efficient 24W (12V, 2A) 2MHz Buck-Boost Voltage Regulator

with Output Current Limit

APPLICATIONS

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Up to 95% Efficiency at 2MHz

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Proprietary Peak Current Mode

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3V to 40V Input Voltage Range

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1V to 18V Output Voltage Range

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±1.5% Output Voltage Regulation

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Output/Input Current Regulation and Monitor

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Constant-Voltage/Constant-Current Regulation

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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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200kHz to 2MHz Fixed Switching Frequency with

External Frequency Synchronization and SSFM

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Small 4mm × 6mm 32-Pin LQFN Package

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AEC-Q100 Qualification in Progress

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Automotive, Industrial, Telecom Systems

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Voltage Regulator with Accurate Current Limit

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High Frequency Battery-Powered System

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USB-PD Source

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22µF

LT8350

SW2

SS

RT

3.9k

22nF

FB

ISP

ISN

LOADTG

ISMON

CURRENT MONITOR

CLKOUT

SYNC/MODE

3.3nF

SW1

EN/UVLO

RP

100k

CTRL

LOADEN

PGOOD

8V TO 36V

10µF

499k

115k

110k

14.3k

10k

1µF

GND

4.7µF

30m

4.7µF

12V

8350 TA01a

220nF

1µF

2.2µH

100nF

100nF

BST1

BST2

+

3.3A CURRENT LIMIT

2MHz

INPUT VOLTAGE (V)

0

5

10

15

20

25

30

35

40

75

80

85

90

95

100

8350 TA01b