ETA1035

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1

3W, 0.85V Startup Voltage, Synchronous Step-Up Converter with

Real-Shutdown and Short-Circuit Protection

DESCRIPTION

The ETA1035 is a high efficiency synchronous step-up

converter that can provide up to 3W of power to a boosted

output from a low voltage source. Unlike most step-up

converter, not only it starts up at a very low input voltage

as low as 0.85V, it also incorporates circuits that

disconnect the input from output, during shutdown,

short-circuit, output current overloading, or other events

when output is higher than the input. This eliminates the

need for an external MOSFET and its control circuitry to

disconnect the input from output, and provides robust

output overload protection.

The ETA1035 starts up from a voltage as low as 0.85V

making it ideal for applications with single-cell or two-cell

alkaline, NiCd, and NiMh batteries. A switching frequency of

2MHz minimizes solution footprint by allowing the use of

tiny and low profile inductors and ceramic capacitors. An

internal synchronous MOSFET provides highest efficiency

and with a current mode control that is internally

compensated, external parts count is reduced to minimal.

FEATURES



Output Disconnect



Short-circuit Protection



3W Output Power



Output to Input Reversed Current Protection



0.85V Low Start-up Voltage



VIN range from 0.6V to 4.5V



Up to 96% Efficiency





Internal Synchronous Rectifier



Current Mode control



Logic Control Shutdown and Thermal shutdown



DFN2x2-6 Package

APPLICATIONS



USB OTG for MIDs, Smartphones



Mobile back-up Battery Chargers



Alkaline, NiCd, and NiMh batteries applications



USB powered devices

ORDERING INFORMATION

PART #

PACKAGE PIN

TOP MARK

ETA1035D2G-T

DFN2x2-6

DPYW

Date Code

Product Number

TYPICAL APPLICATION

ETA1035

GND

FB

IN

OUT

3.3V/0.8A

2.2μH

EN

4.7μF

6.3V

22μF

5

1

3

2

4

SW

6

2.2nF *needed if Vout>4,5V

0%

20%

40%

60%

80%

100%

0.01

0.1

1

VIN=3V

VIN=2.4V

VIN=1.8V

VIN=1.2V