AS1340_04 datasheet(2/17 Pages) AMSCO

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AS1340

Datasheet - Pin Assignm ents

4 Pin Assignments

Figure 2. Pin Assignments (Top View)

4.1 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.

Note:

Connect to VCC for normal operation.

2VCC

+2.7V to +5.5V Supply Voltage. Bypass this pin to GND with a

1µF capacitor.

3SWVIN

Shutdown Disconnect Switch In

4POK

Power-OK.

0 = VOUT < 90% of VOUTNOM.

1 = VOUT > 90% of VOUTNOM.

5LX

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

Note:

This pin is high impedance in shutdown.

6SWOUT

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

7GND

Ground. This pin and pin 9 must be connected to GND to ensure normal operation.

8FB

Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor divider tap to this pin. The

output voltage can be adjusted from VIN to 50V by:

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

9GND

Ground. This pin and pin 7 must be connected to GND to ensure normal operation.

5 LX

SWVIN

VCC

8 FB

AS1340

POK

7GND

6SWOUT

GND

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