Datasheet > AS1322_1

AS1322_1

更新时间： 2022-12-27 17:49:42

品牌	Logo	应用领域
艾迈斯 - AMSCO		转换器升压转换器
页数	文件大小	规格书
17页	740K
描述
Low Voltage, Micropower, DC-DC Step-Up Converters

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AS1322_1 数据手册

Data Sheet

AS1322

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

1 General Description

2 Key Features

ꢀ

95% Efficiency

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.

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 switching frequency (1.2MHz) and internally

compensated PWM current mode design provide highly-

reliable DC-DC conversion, especially when driving

white LEDs.

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

The converters are available as the standard products

listed in Table 1.

Table 1. Standard Products

Model

Light Load Switching

Automatic Powersave Operation

Continuous Switching

AS1322A

AS1322B

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.

6-pin TSOT-23 Package

3 Applications

In shutdown mode the battery is connected to the output

and VOUT is held at approximately VIN - 0.6V.

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.

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

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

4.7µH

V^OUT

3.3V

160mA

AA Battery

VOUT

VIN

10µF

1.02MΩ

AS1322

Off

SHDNN

604kΩ

GND

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