AS1340 データシートの表示（PDF） - Unspecified

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AS1340

50V, Micropower, DC-DC Boost Converter

Unspecified 

AS1340

Datasheet - Pin Assignments

4 Pin Assignments

Figure 2. Pin Assignments (Top View)

EN 1

VCC 2

SWVIN 3

POK 4

8 FB

AS1340

GND 9

7 GND

6 SWOUT

5 LX

4.1 Pin Descriptions

Table 1. Pin Descriptions

Pin Number

Pin Name

1

EN

2

VCC

3

SWVIN

4

POK

5

LX

6

SWOUT

7

GND

8

FB

9

GND

Description

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.

+2.7V to +5.5V Supply Voltage. Bypass this pin to GND with a 1µF capacitor.

Shutdown Disconnect Switch In

Power-OK.

0 = VOUT < 90% of VOUTNOM.

1 = VOUT > 90% of VOUTNOM.

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

Note: This pin is high impedance in shutdown.

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

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

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)]

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

www.ams.com/DC-DC_Step-Up/AS1340

Revision 1.20

2 - 17

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