LT3493E-3 查看數據表（PDF） - Linear Technology

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LT3493E-3

1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN

Linear Technology 

FEATURES

■ Wide Input Range: 6.8V to 36V Operating,

40V Maximum

■ 1.2A Output Current

■ Fixed Frequency Operation: 750kHz

■ Output Adjustable Down to 780mV

■ Short-Circuit Robust

■ Uses Tiny Capacitors and Inductors

■ Soft-Start

■ Internally Compensated

■ Low Shutdown Current: <2µA

■ Low VCESAT Switch: 330mV at 1A

■ Thermally Enhanced, Low Profile 2mm × 3mm

DFN-6 Package

U

APPLICATIO S

■ Automotive Battery Regulation

■ Industrial Control Supplies

■ Wall Transformer Regulation

■ Distributed Supply Regulation

■ Battery-Powered Equipment

LT3493-3

1.2A, 750kHz Step-Down

Switching Regulator in

2mm × 3mm DFN

DESCRIPTIO

The LT®3493-3 is a current mode PWM step-down DC/DC

converter with an internal 1.75A power switch. The wide

operating input range of 6.8V to 36V (40V maximum) makes

the LT3493-3 ideal for regulating power from a wide vari-

ety of sources, including unregulated wall transformers,

24V industrial supplies and automotive batteries. Its high

operating frequency allows the use of tiny, low cost induc-

tors and ceramic capacitors, resulting in low, predictable

output ripple.

Cycle-by-cycle current limit provides protection against

shorted outputs and soft-start eliminates input current

surge during start-up. The low current (<2µA) shutdown

mode provides output disconnect, enabling easy power

management in battery-powered systems.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

3.3V Step-Down Converter

VIN

6.8V TO 36V

ON OFF

VIN

BOOST

LT3493-3

SHDN

SW

GND FB

1µF

0.1µF 10µH

32.4k

10k

VOUT

3.3V

1.2A, VIN > 12V

1.1A, VIN > 8V

22pF

10µF

3493-3 TA01a

Efficiency

90

85

80

75

70

65

60

VIN = 12V

55 VOUT = 3.3V

L = 10µH

50

0 0.2 0.4 0.6 0.8

LOAD CURRENT (A)

1.0 1.2

3493-3 TA01b

3493-3f

1

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