AS1349 Austin Semiconductor, AS1349 Datasheet - Page 2

• Manufacturer Part Number: AS1349
• Description: (AS1346 - AS1349) Dual Step Down Converter
• Manufacturer: Austin Semiconductor

AS1346, AS1347, AS1348, AS1349
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
Pin Descriptions
www.austriamicrosystems.com/DC-DC_Step-Down/AS1346
Table 2. Pin Descriptions
Pin Number
2, 11
10
12
13
1
3
4
5
6
7
8
9
Pin Name
AGND
PGND
PVIN
SW1
VDD
SW2
LBO
EN1
FB1
EN2
FB2
LBI
Switch Node1 Connection to Inductor. This pin connects to the drains of the internal
main and synchronous power MOSFET switches.
Power Supply Connector. This pin must be closely decoupled to PGND with a ≥
4.7µF ceramic capacitor.
Enable1 Input. Driving this pin above 1.2V enables V
puts the device in shutdown mode. In shutdown mode all functions are disabled,
drawing ≤1µA supply current.
This pin should not be left floating.
Feedback Pin 1. Feedback input to the error amplifier, connect this pin to V
output can be factory set from 1.2V to 3.6V. For further information
mation on page
Enable2 Input. Driving this pin above 1.2V enables V
puts the device in shutdown mode. In shutdown mode all functions are disabled,
drawing ≤1µA supply current.
This pin should not be left floating.
Low Battery Comperator Output. This open-drain output is low when the voltage on
LBI is less than 1.2V.
Low Battery Comperator Input. 1.2V Threshold. May not be left floating. If
connected to GND, LBO is working as Output Power Okay for V
Analog Ground.
Feedback 2 Pin. Feedback input to the error amplifier, connect this pin to V
output can be factory set from 1.2V to 3.6V. For further information
mation on page
Supply Connector. Connect this pin to PVIN
Switch Node2 Connection to Inductor. This pin connects to the drains of the internal
main and synchronous power MOSFET switches.
Exposed Pad. The exposed pad must be connected to AGND. Ensure a good
electrical connection to the PCB to achieve optimal thermal performance.
PVIN 2
SW1 1
LBO 6
EN1 3
EN2 5
FB1 4
14.
14.
AS1346
Revision 1.01
13
12
10
11
9
8
7
SW2
PVIN
VDD
FB2
AGND
LBI
Description
OUT1
OUT2
. Driving this pin below 0.5V
. Driving this pin below 0.5V
OUT1
see Ordering Infor-
see Ordering Infor-
.
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OUT1
OUT2
. The
. The
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