AS1331 Просмотр технического описания (PDF) - austriamicrosystems AG
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AS1331 Datasheet PDF : 17 Pages
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AS1331
Datasheet - Detailed Description
Output Voltage Selection
The AS1331 is available in two versions (see Ordering Information on page 15). One version can only operate at one
fixed output voltage (see Figure 25) and the other version can operate with user-adjustable output voltages from 2.5V
to 3.3V by connecting a voltage divider between the pins VOUT and FB (see Figure 24).
Figure 24. LiIon to Adjustable Output Voltage
L1
6.8µH
lid LiIon Battery
a C1
ill v 10µF
4 SW1
2 SW2
5
8
VIN
R4
LBO
R3
7
1
R5
LBI AS1331-AD VOUT
R1
On
6
10
Off EN
FB
R2
3 PGND 9 GND
C2
22µF
VOUT
2.5V to 3.3V
AG t st The output voltage can be adjusted by selecting different values for R1 and R2.
s en Calculate VOUT by:
VOUT = VFB × ⎝⎛1 + RR----12-⎠⎞
m t Where:
a n VFB = 1.25V, VOUT = 2.5V to 3.3V;
R2 (the predefined resistor in the resistor devider) should be ≤ 270kΩ.
o R3 (the Pull-up resistor for the LBO pin) should be ~100kΩ.
(EQ 2)
l c Figure 25. LiIon to 3.3V with POK - Fixed Output Voltage
a L1
6.8µH
nic LiIon Battery
C1
Tech10µF
4 SW1
2 SW2
5
8
VIN
LBO
R3
7 AS1331- 1
LBI
3.3V
VOUT
On
6
10
Off
EN
FB
C2
22µF
VOUT
3.3V
300mA
3 PGND 9 GND
www.austriamicrosystems.com/DC-DC_Buck-Boost/AS1331
Revision 1.04
12 - 16
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