LT8610AX

1

8610axf

For more information www.linear.com/LT8610AX

TYPICAL APPLICATION

FEATURES

DESCRIPTION

42V, 3.5A Synchronous

Step-Down Regulator with

Operation to 175°C

The LT®8610AX is a compact, high efficiency, high speed

synchronous monolithic step-down switching regulator

rated to 175°C junction temperature. The LT8610AX is

100% tested a 175°C. Top and bottom power switches

are included with all necessary circuitry to minimize the

need for external components. Low ripple Burst Mode

operation enables high efficiency across a wide range of

outputcurrentswhilekeepingtheoutputripplelow.ASYNC

pin allows synchronization to an external clock. Internal

compensation 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

undervoltage lockout or to shut down the LT8610AX. A

capacitor on the TR/SS pin programs the output voltage

ramp rate during startup while the PG flag signals when

as well as fault conditions. The LT8610AX is available in

small 16-lead MSOP package with exposed pad for low

thermal resistance.

APPLICATIONS

n

100% Tested at 175°C

n

±2% Reference Accuracy Over –40°C to 175°C Range

n

Wide Input Voltage Range: 3.7V to 42V

n

n

High Efficiency Synchronous Operation

n

n

n

Adjustable and Synchronizable Frequency: 200kHz

to 2.2MHz

n

No Thermal Shutdown

n

Internal Compensation

n

Output Soft-Start and Tracking

n

Power Good Flag

n

Small Thermally-Enhanced 16-Lead MSOP Package

n

Oil and Gas Exploration

L

, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

3.3V Step-Down Converter

Efficiency at 175°C

47µF

60.4k

4.7µF

1µF

100nF

4.7µH

0.1µF

100k

41.2k

10pF

49.9k

3.3V

3.5A

SW

FB

GND

EN/UV

LT8610AX

3.7V TO 42V

PG

SYNC

TR/SS

RT

BST

BIAS

1210

X7R

×2

8610AX TA01a

LOAD CURRENT (mA)

1

10

100

1k

10k

0

10

20

30

40

50

60

70

80

90

100

Efficiency at 175°C

8610AX TA01b