AS1340
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
EN 1
VCC 2
8 FB
7 GND
AS1340
SWVIN 3
POK 4
GND 9
6 SWOUT
5 LX
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
Pin Name
EN
VCC
SWVIN
POK
LX
SWOUT
GND
FB
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 V
CC
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 = V
OUT
< 90% of V
OUTNOM
.
1 = V
OUT
> 90% of V
OUTNOM
.
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 g
m
error amplifier. Connect a resistor divider
tap to this pin. The output voltage can be adjusted from V
IN
to 50V by:
V
OUT
= 1.25V[1 + (R
1
/R
2
)]
Ground.
This pin and pin 7 must be connected to GND to ensure normal operation.
www.austriamicrosystems.com
Revision 1.10
2 - 16
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
