ETA1483B

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1

2.5A, 18V High Efficiency Synchronous Step-Down Converter

DESCRIPTION

The ETA1483B is a wide input range, high-efficiency,

DC-to-DC step-down switching regulator, capable of

delivering up to 2.5A of output current. Current mode PWM

control allows the use of small external components, such

as ceramic input and output caps, as well as small

inductors, while still providing low output ripples. On top of

the integrated internal synchronous rectifier that

eliminates external Schottky diode, ETA1483B also employs

a proprietary control scheme that switches the device into

a power save mode during light load, thereby extending the

range of high efficiency operation. Therefore, ETA1483B is a

much superior solution in comparison to other

competitions in terms of efficiency and cost.

Cycle-by-cycle current limit provides output short-circuit

protection and an input OVP function guards ETA1483B

against possible input voltage surge. Overall, ETA1483B is a

highly efficient and robust solution for DC-DC step-down

applications that requires wide input ranges.

ETA1483B is housed in a ESOP8 Package.

FEATURES



Wide Input Operating Range from 4.5V to 18V



High Efficiency:



Up to 90%at Light Load



Up to 95% at Heavy Load



Capable of Delivering 2.5A



Input OVP at 20V



No External Schottky Diode Needed



Current Mode control



0.923V Reference for Low Output voltages



Logic Control Shutdown



Thermal shutdown and UVLO



Available in SOP8

APPLICATIONS



LCD TVs



Notebook computers



FPGA power supplies



LED drivers



Car Charging Device

ORDERING INFORMATION

PART

PACKAGE PIN TOP MARK

ETA1483BE8A-T ESOP8

YWWPL

Date Code

TYPICAL APPLICATION

EN

GND

BST

ETA1483B

IN

COMP

SW

FB

SS

10nF

0.1μF

3.3nF

5.6kΩ

26.1kΩ

10kΩ

1

100kΩ

3

5

6

4

7

8

2

22μF

22μF

X2

10μH

30

40

50

60

70

80

90

100

20

200

2000

Vin=5V

Vin=12V