AS1331 Просмотр технического описания (PDF) - austriamicrosystems AG
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AS1331 Datasheet PDF : 17 Pages
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Datasheet
AS1331
300mA Buck-Boost Synchronous DC/DC Converters
1 General Description
2 Key Features
This special device is a synchronous buck-boost DC/DC
converter which can handle input voltages above, below,
or equal to the output voltage.
lid Due to the internal structure of the AS1331 which is
working continuously through all operation modes this
device is ideal for dual or triple cell alkaline/NiCad/NiMH
as well as single cell Li-Ion battery applications.
a Because of the implemented Power Save Mode, the
solution footprint and the component count is minimized
v and also over a wide range of load currents a high
conversion efficiency is provided.
ill The device includes two N-channel MOSFET switches
and two P-channel switches. Also following features are
t implemented: a quiescent current of typically 22µA
(ideal for battery power applications), a shutdown
G s current less than 1µA, current limiting, thermal shutdown
and output disconnect.
A t The AS1331 is available in a 10-pin 3x3mm TDFN
ms 3 Aptpelicantions package with fixed and adjustable output voltage.
! Input Voltage Range: 1.8V to 5.5V
! Output Voltages:
- Fixed: 2.5V, 3.0V, 3.3V
- Adjustable: 2.5V to 3.3V
! Output Current: 300mA @ 3.3V
! Up to 90% efficiency
! Power Good
! Output Disconnection in Shutdown
! Automatic transition between Buck and Boost mode
! Ultra Low Quiescent Current: 22µA, Shutdown Cur-
rent <1µA (Active Low)
! Short-Circuit Protection
! Low Battery detection
! Over Temperature Protection
! 10-pin 3x3mm TDFN package
The AS1331 is an ideal solution for handheld
computers, handheld instruments, portable music
players and PDA’s. Two and three cell Alkaline, NiCd or
NiMH or single cell Li battery powered products.
a con Figure 1. AS1331 - Typical Application Diagram
al L1
6.8µH
nic 1.8V to 5.5V
hC1
Tec10µF
4 SW1
5
2 SW2
8
Low Battery Detect
VIN
R4
LBO
R3
7
1
R5
LBI AS1331-AD VOUT
R1
On
6
10
Off EN
FB
R2
C2
22µF
VOUT
2.5V to 3.3V
3 PGND 9 GND
www.austriamicrosystems.com/DC-DC_Buck-Boost/AS1331
Revision 1.04
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