AS1331(Rev1-03) データシートの表示（PDF） - austriamicrosystems AG
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AS1331 Datasheet PDF : 16 Pages
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AS1331
Datasheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
VOUT 1
SW2 2
PGND 3
SW1 4
VIN 5
10 FB
9 GND
AS1331 8 LBO
7 LBI
11 6 EN
Pin Descriptions
Table 1. Pin Descriptions
Pin
Name
VOUT
SW1
PGND
SW2
VIN
EN
LBI
LBO
GND
FB
NC
Pin
Number
1
2
3
4
5
6
7
8
9
10
Description
Output of the Buck/Boost Converter.
Buck/Boost Switch Pin. Connect the inductor from SW1 to SW2
Power Ground. Both GND pins must be connected.
Buck/Boost Switch Pin. Connect the inductor from SW1 to SW2. An
optional Schottky diode can be connected between this pin and VOUT to
increase efficiency.
Input Supply Pin. A minimum 2.2µF capacitor should be placed between
VIN and GND.
Enable Pin. Logic controlled shutdown input.
1 = Normal operation;
0 = Shutdown; quiescent current <1µA.
Low Battery Comperator Input. 1.25V Threshold. May not be left floating.
If connected to GND LBO is working as Output Power okay.
Low Battery Comperator Output. This open-drain output is low when the
voltage on LBI is less than 1.25V.
Ground. Both GND pins must be connected.
Feedback Pin. Feedback input for the adjustable version. Connect a
resistor divider tap to this pin. The output voltage can be adjusted from 2.5V
to 3.3V by: VOUT = 1.25V[1 + (R1/R2)]
Note: For the fixed Output Voltage Version contact this pin to VOUT.
11
Exposed Pad. This pad is not connected internally. It can be used for
ground connection between GND and PGND.
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Revision 1.03
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