ETA1483

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1

2A, 18V High Efficiency Synchronous Step-Down Converter

DESCRIPTION

The ETA1483 is a wide input range, high-efficiency,

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

delivering up to 2A 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, ETA1483 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, ETA1483 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 ETA1483

against possible input voltage surge. Overall, ETA1483 is a

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

applications that requires wide input ranges.

ETA1483 is housed in a SOP8 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 2A



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

ETA1483S8A-T

ETA1483S8A-U

SOP8

TYPICAL APPLICATION

EN

GND

BST

ETA1483

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