ETA1485

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1

3A, 18V High Efficiency Synchronous Step-Down Converter

DESCRIPTION

The ETA1485 is a wide input range, high-efficiency,

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

delivering up to 3A 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, ETA1485 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, ETA1485 is a

much superior solution in comparison to other

competitions in terms of efficiency and cost. Overall,

ETA1485 is a highly efficient and robust solution for DC-DC

step-down applications that requires wide input ranges.

ETA1485 is available ESOP8 Packages.

APPLICATIONS



LCD TVs



Notebook computers



FPGA power supplies



LED drivers



FEATURES



Wide Input Operating Range from 4.5V to 18V



High Efficiency:



Up to 90%at Light Load



Capable of Delivering 3A



No External Schottky Diode Needed



Current Mode control



0.923V Reference for Low Output voltages



Logic Control Shutdown



Thermal shutdown and UVLO



Available in ESOP8 Package



ORDERING INFORMATION

PART

PACKAGE PIN

TOP MARK

ETA1485E8A-T ESOP8

ETA1485

YLLFF

Date Code

Product Number

TYPICAL APPLICATION

EN

GND

BST

ETA1485

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%

0.01

0.1

1

10

VOUT=5V

VOUT=3.3V