AS1331-BTDT-30-1K austriamicrosystems, AS1331-BTDT-30-1K Datasheet - Page 12

• Manufacturer Part Number: AS1331-BTDT-30-1K
• Description: IC CONV BUCK/BOOST 3V 10TDFN
• Manufacturer: austriamicrosystems
• Type: Step-Down (Buck), Step-Up (Boost)r

Specifications of AS1331-BTDT-30-1K

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 3V
• Current - Output: 300mA
• Voltage - Input: 1.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Frequency - Switching: -
• Other names: AS1331-BTDT-30-1KTR

AS1331
Datasheet - D e t a i l e d D e s c r i p t i o n
Output Voltage Selection
The AS1331 is available in two versions
fixed output voltage
to 3.3V by connecting a voltage divider between the pins
Figure 24. LiIon to Adjustable Output Voltage
The output voltage can be adjusted by selecting different values for R
Calculate V
Where:
V
R
R
Figure 25. LiIon to 3.3V with POK - Fixed Output Voltage
www.austriamicrosystems.com/DC-DC_Buck-Boost/AS1331
FB
2
3
(the predefined resistor in the resistor devider) should be ≤ 270k Ω .
(the Pull-up resistor for the LBO pin) should be ~100k Ω .
= 1.25V, V
LiIon Battery
LiIon Battery
OUT
OUT
by:
10µF
= 2.5V to 3.3V;
C
(see Figure 25)
1
10µF
C
1
R
R
4
5
and the other version can operate with user-adjustable output voltages from 2.5V
On
Off
On
Off
(see Ordering Information on page
VIN
LBI
EN
VIN
LBI
EN
5
7
6
5
7
6
V
OUT
3
4
3
4
AS1331-AD
PGND
SW1
=
PGND
AS1331-
SW1
Revision 1.04
6.8µH
V
6.8µH
3.3V
VOUT
L1
FB
L1
×
⎛
⎝
9
2
1
9
2
and FB
+
GND
SW2
GND
R
----- -
R
SW2
1
2
⎞
⎠
1
and R
8
LBO
1
VOUT
10
FB
8
LBO
1
VOUT
10
FB
(see Figure
15). One version can only operate at one
2
.
R
R
R
R
3
2
1
3
24).
22µF
C
2
22µF
C
2
300mA
V
3.3V
2.5V to 3.3V
OUT
V
OUT
(EQ 2)
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