AS1345 datasheet(4/29 Pages) AMSCO

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AS1345 – 4

ams Datasheet, Confidential: 2013-Nov [1-51]

P i n Assi gnments

Figure 4:

Pin Assignments (Top View)

Figure 5:

Pin Descriptions

Pin Number

Pin Name

Description

TDFN

WLP

1A1

VDD

Supply Voltage. Connect to a 2.9V to 5.0V input supply. Bypass this pin

with a 10μF capacitor.

2A2

Enable Pin. Logic controlled shutdown input, 1.8V CMOS compatible;

1 = Normal operation

0 = Shutdown

On request a 100k

Ω pull-down resistor can be enabled (factory set).

3A3

Feedback Pin. Feedback input to the gm error amplifier.

For an adjustable output voltage connect a resistor divider to this pin.

The output can be adjusted from 5.0V to 18V by:

VOUT = VREF x (1 + R2/R3)

If the fixed output voltage version is used, connect this pin to VOUT.

4A4

POK

POK. Open Drain Output. POK remains low while VOUT is less than 90%

of nominal VOUT. Connect a 100k

Ω pull-up resistor from this pin to VDD.

5B4

SWIN

Shutdown Disconnect Switch In. Input pin of the internal P-channel

MOSFET.

Pin Assignments

AS1345

TDFN 8-pin

2x2mm

GND

VDD

POK

SWOUT

SWIN

VDD

SWOUT

POK

GND

Pin A1

indicator

SWIN

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