Austriamicrosystems AS1344 42V DC升压转换方案

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Austriamicrosystems AS1344 42V DC升压转换方案

作者：时间：2009-08-12 09:08 来源：

Austriamicrosystems 公司的AS1344是42V 带软起动的DC/DC升压转换器,工作电压从0.9V到3.6V,输出电压高达42V,并由外接分压电阻调整,在12V输出时可从1.5V VCC上输出30mA电流,效率高达85%,开关频率1MHz,静态电流22uA,关断电流0.1uA,主要用在OLED显示器电源,LCD偏压发生器,手机/绳电话,掌上电脑,PDA,手持终端,以电池为能源的设备等.本文介绍了AS1344的主要特性,方框图和典型应用电路以及LED电源电路图和推荐使用的电感,电容和二极管.

AS1344 42V, DC-DC Boost Converter with adjustable Softstart

The AS1344 boost converter contains a 1.4A internal switch in a tiny TDFN-10 3x3mm package. The device operates from a 0.9V to 3.6V supply, and can boost voltages up to 42V output. The output voltage can easily be adjusted by an external resistor divider.

The AS1344 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 AS1344 also features power-OK circuitry which monitors the output voltage.

The device also offers a Softstart function which limits the current during startup. The current during startup can be easily adjusted with the value of RV. For RV =0Ω, there is no softstart.

Additionally the AS1344 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 AS1344 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-10 3x3mm package.

AS1344主要特性:

5.5V to 42V Adjustable Output Voltage

0.9V to 3.6V Supply Voltage Range

High Output Current:

- 30mA @ 12V VOUT, from 1.5V VCC

Efficiency: Up to 85%

Switching Frequency: 1MHz

Output Disconnect Function

Softstart Function with adjustable Current Limit

Output Discharge Function

Power-OK Output

Quiescent Current: 22μA

Shutdown Current: 0.1μA

TDFN-10 3x3mm Package

AS1344应用:

The device is ideal for OLED display power supply, LCD bias generators, mobile/cordless phones, palmtop computers, PDAs and organizers, handy terminals, driving LEDs or any other portable, battery-powered device.