ETA9040 datasheet(1/1 Pages) ETA

Part #	ETA9040

Description	Two-Channel Power Management Unit A 500mA Step-Up Converter and A 300mA LDO in SOP8

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Manufacturer	ETA [ETA SOLUTIONS CO. LIMITED]

Direct Link	http://www.etasolution.com

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ETA9040

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Two-Channel Power Management Unit

A 500mA Step-Up Converter and A 300mA LDO in SOP8

FEATURES



Consists of A low Start-up Boost and a high PSRR

LDO



Low Vin Start-up Voltage down to 850mV Ideal for

Single Alkaline Cell operations



A Step-up capable of delivering 500mA output

current at Vin=3.0V, V out=3.3V



1MHz Switching Frequency allows small inductor

and output cap



High PSRR LDD: 74dB



LDO output current up to 300mA



Logic Control Shutdown (IQ<1uA)



Available in SOP-8

APPLICATIONS



Medical Instruments



Bluetooth Headsets



Flash-Based MP3 Players



Wireless Mice



One to Three Cell Battery Operated Devices

DESCRIPTION

The ETA9040 is a tow-channel power management unit

that consists of a step-up converter capable of

delivering 500mA output current and a high PSRR

300mA LDO. The step-up converter can be

bootstrapped from a low voltage source and generate

output voltage up to 5V. It starts up at a very low input

voltage down to 850mV, making it an ideal choice for

single cell alkaline/NiMH battery operations. The input

of the LDO can be connected to the output of the

step-up converter. This configuration is therefore an

effective way of generating an output that is higher or

lower than the input voltage, in other words, a

buck-boost converter. Since the output is step-down

from a LDO, its ripple is much superior to that of

traditional switching buck-boost converters.

A switching frequency of 1MHz minimizes solution

footprint by allowing the use of tiny, low profile

inductors and ceramic capacitors. Eliminating the need

for Tantalum caps not only saves cost, it is also

environmental friendly.

ETA9040 is housed in a SOP8 package.

TYPICAL APPLICATION

GND

ETA9040

SW

VIN 0.85V-4.5V

EN_LDO

OUT_BST

FB_BST

VOUT_BST 5V/0.5A

1

3

5

6

4

7

8

2

4.7μF

IN_LDO

OUT_LDO

EN_BST

1μF

VOUT_LDO 3.3V/0.3A

4.7μH

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ETA9040 Datasheet(PDF) 1 Page - ETA SOLUTIONS CO. LIMITED

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