AS1322_1 AMSCO [austriamicrosystems AG], AS1322_1 Datasheet

AS1322_1

Manufacturer Part Number

AS1322_1

Description

Low Voltage, Micropower, DC-DC Step-Up Converters

Manufacturer

AMSCO [austriamicrosystems AG]

Datasheet

1.AS1322_1.pdf (17 pages)

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A S 1 3 2 2

L o w Vo l ta g e , M i c r o p o w e r, D C - D C St e p - U p C o n v e r t e r s

1 General Description

The AS1322A and the AS1322B are synchronous, fixed

frequency, very high-efficiency DC-DC boost converters

capable of supplying 3.3V at 150mA from a single AA-

supply. Compact size and minimum external parts

requirements make these devices perfect for modern

portable devices.

High-speed switching frequency (1.2MHz) and internally

compensated PWM current mode design provide highly-

reliable DC-DC conversion, especially when driving

white LEDs.

The converters are available as the standard products

listed in

Table 1. Standard Products

The devices contain two internal MOSFET switches:

one NMOS switch and one PMOS synchronous rectifier.

Anti-ringing control circuitry reduces EMI by damping

the inductor in discontinuous mode, and the devices

exhibit extremely low quiescent current (< 1µA) in shut-

down.

In shutdown mode the battery is connected to the output

and V

The AS1322 is available in a 6-pin TSOT-23 package.

www.austriamicrosystems.com

Figure 1. Typical Application Diagram – Single Cell to 3.3V Synchronous Boost Converter

AS1322A

AS1322B

Model

OUT

Table

is held at approximately V

AA Battery

Automatic Powersave Operation

Light Load Switching

Continuous Switching

Off

10µF

SHDNN

- 0.6V.

4.7µH

AS1322

Revision 1.07

GND

2 Key Features

3 Applications

The AS1322 is ideal for low-power applications where

ultra-small size is critical as in medical diagnostic equip-

ment, hand-held instruments, pagers, digital cameras,

remote wireless transmitters, MP3 players, LCD bias

supplies, cordless phones, GPS receivers, and PC

cards.

OUT

95% Efficiency

Single-Cell Operation

Delivers 160mA @ 3.3V (from Single AA Cell)

Delivers 220mA @ 5.0V (from Two AA Cells)

Delivers 570mA @ 3.3V (from Two AA Cells)

Low Start-Up Voltage: 0.85V

High-Speed Fixed-Frequency: 1.2MHz

Internal PMOS Synchronous Rectifier

Automatic Powersave Operation (AS1322A)

Continuous Switching at Light Loads (AS1322B)

Anti-Ringing Control Minimizes EMI

Logic Controlled Shutdown (< 1µA)

Output Range: 2.5 to 5.0V

6-pin TSOT-23 Package

604kΩ

1.02MΩ

10µF

160mA

3.3V

OUT

D a t a S h e e t

1 - 17

Related parts for AS1322_1

AS1322_1 Summary of contents

Page 2

AS1322 Data Sheet - Pin Assignments Figure 2. Pin Assignments (Top View) Pin Descriptions Table 2. Pin Descriptions Pin Pin Name Number ...

Page 3

AS1322 Data Sheet - Absolute Maximum Ratings Stresses beyond those listed in Table 3 and functional operation ...

Page 4

AS1322 Data Sheet - Electrical Characteristics T = -40 to +85º +1.2V, ...

Page 5

AS1322 Data Sheet - Typical Operating Characteristics Figure 3. ...

Page 6

AS1322 Data Sheet - Figure 9. Output Current vs. Battery ...

Page 7

AS1322 Data Sheet - Detailed Description The AS1322/AS1322B can operate from a single-cell input voltage (V (1.2MHz) and current mode ...

Page 8

AS1322 Data Sheet - Low-Noise Fixed-Frequency Operation Oscillator The AS1322 switching frequency is internally fixed at 1.2MHz allowing the use of ...

Page 9

AS1322 Data Sheet - Application Information The AS1322 is perfectly suited for LED matrix displays, bar-graph displays, ...

Page 10

AS1322 Data Sheet - Figure 18. Single AA Cell to ±3V Synchronous Boost Converter L1 4.7µ ...

Page 11

AS1322 Data Sheet - External Component Selection Inductor Selection The fast switching frequency (1.2MHz) of the AS1322 allows ...

Page 12

AS1322 Data Sheet - Figure 20. Efficiency Comparison of Different Inductors ...

Page 13

AS1322 Data Sheet - PCB Layout Guidelines The high-speed operation of the AS1322 requires proper layout for optimum ...

Page 14

AS1322 Data Sheet - Package Drawings and Markings The device is available in ...

Page 15

AS1322 Data Sheet - These dimensions apply to the flat section of the ...

Page 16

AS1322 Data Sheet - Ordering Information The device is available as the standard products listed in Table 8. Ordering Information ...

AS1322 Data Sheet 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, trans- lated, stored, or used without the prior written consent of ...

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