AMSCO AS1340

AS1340
Product Brief
5 0 V, M i c r o p o w e r, D C - D C B o o s t C o n v e r t e r
1 General Description
2 Key Features
The AS1340 boost converter contains a 1.4A internal
switch in a tiny TDFN-8 3x3mm package. The device
operates from a 2.7 to 5.5V supply, and can boost voltages up to 50V output.
!
2.7V to 50V Adjustable Output Voltage
!
2.7V to 50V Input Voltage Range
The output voltage can easily be adjusted by an external
resistor divider.
!
2.7V to 5.5V Supply Voltage Range
!
High Output Currents:
- 100mA @ 12V from 3.3V VIN
- 50mA @ 24V from 3.3V VIN
- 30mA @ 36V from 3.3V VIN
!
Efficiency: Up to 90%
!
Switching Frequency: 1MHz
!
Output Disconnect
!
Power-OK Output
!
Operating Supply Current: 30µA
!
Shutdown Current: 0.1µA
!
TDFN-8 3x3mm Package
The AS1340 uses a unique control scheme providing
the highest efficiency over a wide range of load conditions. An internal 1.4A MOSFET reduces external component count, and a fixed high switching frequency
(1MHz) allows for tiny surface-mount components.
The AS1340 also features power-OK circuitry which
monitors the output voltage.
Additionally the AS1340 features a low quiescent supply
current and a shutdown mode to save power. During
shutdown an output disconnect switch separates the
input from the output.
The AS1340 is ideal for LCD or OLED panels with low
current requirements and can also be used in a wide
range of other applications.
The device is available in a low-profile TDFN-8 3x3mm
package.
3 Applications
The device is ideal for OLED display power supply, LCD
bias generators, mobile/cordless phones, palmtop computers, PDAs and organizers, handy terminals or any
other portable, battery-powered device.
Figure 1. Typical Application Diagram
L1
4.7µH
3
VIN = 2.7V
to 5.5V
CIN
SWVIN
SWOUT
6
LX
VCC
VOUT = >VIN to 50V
VOUT
5
LX
VCC
AS1340
POK
R1
COUT
8
1
SHDNN
VIN = 2.7V
to ~VOUT
L1
FB
R2
On
Off
3
VIN = 2.7V
to 5.5V
6
2
4
L1
7, 9
3
VIN = 2.7V
to 5.5V
VCC
GND
6
VOUT
LX
If not needed the output disconnect switch can be left unconnected which will also increase the efficiency.
Additionally the supply of the chip can be split to allow higher supply voltages for the coil. In this case the output disconnect switch must not be used.
www.austriamicrosystems.com
Revision 1.01
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AS1340
Product Brief
Copyrights
Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the copyright owner.
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Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement.
austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice.
Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for
current information. This product is intended for use in normal commercial applications. Applications requiring
extended temperature range, unusual environmental requirements, or high reliability applications, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional processing by
austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show
deviations from the standard production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the
technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
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Revision 1.01
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