ETA2821

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1

42V Input Standoff Voltage, 1.5A Step-Down Converter in SOT23-6

DESCRIPTION

The ETA2821 is a wide input range, high-efficiency, and high

frequency DC-to-DC step-down switching regulator,

capable of delivering up to 1.5A of output current. With a

fixed switching frequency of 650KHz, this current mode

PWM controlled converter allows the use of small external

components, such as ceramic input and output caps, as

well as small inductors.ETA2821 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. An OVP function protects the IC itself

and its downstream system against input voltage surges.

With this OVP function, the IC can stand off input voltage as

high as 42V, making it an ideal solution for industrial

applications such as smart meters as well as automotive

applications.

In automotive systems, power comes from the battery, with

its voltage typically between 9V and 24V. Including cold

crank and double battery jump-starts, the minimum input

voltage may be as low as 4V and the maximum up to 36V,

with even higher transient voltages. With these high input

voltages, linear regulators cannot be used for high supply

currents without overheating the regulator. Instead, high

efficiency switching regulators such as ETA2821 must be

used to minimize thermal dissipation.

ETA2821 is available SOT23-6 Packages.

FEATURES



Wide Input Operating Range from 4V to 38V



Standoff Input Voltage: 42V



High Efficiency at 12V In 5V Out: Up to 91%:



High Efficiency PFM mode at light load



Capable of Delivering 1.5A



No External Compensation Needed



Current Mode control



Logic Control Shutdown



Thermal shutdown and UVLO



Available in SOT23-6 Package

APPLICATIONS



Smart Meters



Industrial Applications



Automotive Applications

ORDERING INFORMATION

PART #

PACKAGE PIN

TOP MARK

ETA2821S2G-T

SOT23-6

EGYW

Date Code

Product Number

TYPICAL APPLICATION

GND

FB

IN

SW

5.0V/1.5A

10μH

84K

16K

EN

50V

10μF

6.3V

22μF

5

4

6

3

2

BST

10nF

1

D1

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0.01

0.1

1

VIN=6V

VIN=12V

VIN=24V

VIN=36V