ETA1036

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1

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

Real-Shutdown and Short-Circuit Protection in SOT23-5

DESCRIPTION

The ETA1036 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 ETA1036 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. ETA1036 is available in

three output voltage options. They are 2.1V, 3.3V and 5V. It

is housed in a tiny SOT23-5 package.

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



SOT23-5 Package

APPLICATIONS



USB OTG for MIDs, Smartphones



Mobile back-up Battery Chargers



Alkaline, NiCd, and NiMh batteries applications



USB powered devices

ORDERING INFORMATION

PART #

Output Voltage TOP MARK

ETA1036-50S2F-T 5.0V

CPYW

ETA1036-33S2F-T 3.3V

DzYW

ETA1036-21S2F-T

2.1V

DaYW

TYPICAL APPLICATION

ETA1036

GND

IN

OUT

2.1,3.3V, 5V

2.2μH

EN

4.7μF

6.3V

22μF

5

3

1

2

SW

4

2.2nF *Needed if Vout=5V

0%

20%

40%

60%

80%

100%

0.01

0.1

1

VIN=3V

VIN=2.4V

VIN=1.8V

VIN=1.2V