AS1344 datasheet(2/19 Pages) AMSCO

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AS1344

Datasheet - P i n o u t

4 Pinout

Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 1. Pin Descriptions

Pin Number

Pin Name

Description

1EN

Active-High Enable Input. A logic low on this pin shuts down the device and

reduces the supply current to 0.1µA.

GND: device in shutdown.

VCC : normal operation.

2POK

Power-OK.

0: VOUT < 90% of VOUTNOM.

1: VOUT > 90% of VOUTNOM.

3GND

Ground

4VCC

+0.9V to +3.6V Supply Voltage. Bypass this pin to GND with a

≥10µF capacitor.

5PGND

Ground. Should be the starpoint of CIN and COUT.

6LX

Inductor. The drain of the internal N-channel MOSFET.

Note: This pin is high impedance in shutdown.

7SWOUT

Shutdown Disconnect Switch Out. Disconnects the input from the output during

shutdown.

8VIN

Supply Connection. Connect a resistor between pin VIN and pin VCC for limiting

the input current during startup.

9VOUT

+5.5 to +42V Output Voltage. This pin also powers the AS1344 after startup.

Bypass this pin to GND with a

≥4.7µF capacitor.

Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor divider

tap to this pin. The output voltage can be adjusted from 5.5V to 42V by:

VOUT = 1.25V[1 + (R1/R2)]

7 SWOUT

GND

POK

10 FB

AS1344

VCC

9VOUT

8VIN

6LX

PGND

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