Linear LT3582升压和反相直流电源转换方案

Linear 公司的LT3582/LT3582-5/LT3582-12 是I2C可编程升压和单电感反相的DC/DC转换器. LT3582内置了OTP,可通过I2C接口设定输出参数,包括输出电压,加电次序,关断时放电,以及输出电压斜率.正输出电压设定从3.2V到12.775V,增量25mV, 负输出电压设定从-1.2V到-13.95V,增量-50mV,而LT3582-5 和LT3582-12可在工厂分别预配置成±5V 和±12V输出. 输入电压范围从2.55V 到5.5V,可用在AMOLED电源,CCD电源和通用DC/DC转换器.本文介绍了LT3582系列的主要特性,方框图,多种典型应用电路以及5V输入, ±12V输出的电路图.

LT3582/LT3582-5/LT3582-12 I2C Programmable Boost and Single Inductor Inverting DC/DC Converters with OTP The LT3582/LT3582-5/LT3582-12 are dual DC/DC converters featuring positive and negative outputs and integrated feedback resistors. The LT3582, with its built in One Time Programming (OTP), has configurable output settings via the I2C interface, including output voltage settings, power up sequencing, power down discharge, and output voltage ramp rates. LT3582 settings can be changed adaptively in the final product, or set during manufacturing and made permanent using the built in non-volatile OTP memory.

The positive output voltage can be set between 3.2V and 12.775V in 25mV steps. The negative output voltage can be set between–1.2V and–13.95V in–50mV steps. The LT3582-5 and LT3582-12 are pre-configured at the factory for ±5V and ±12V outputs respectively.

The LT3582 series includes two monolithic converters, one Boost and one Inverting. The Boost converter has an integrated power switch and output disconnect switch. The Inverting converter uses a single inductor topology and includes an integrated power switch. Both Boost and Inverting converters use a novel** control scheme resulting in low output voltage ripple while allowing for high conversion efficiency over a wide load current range. The LT3582 series is available in a 16-pin 3mm x 3mm QFN.

LT3582系列主要特性:

Output Voltages:

3.2V to 12.775V and –1.2V to –13.95V (LT3582)

5V and –5V (LT3582-5)

12V and –12V (LT3582-12)

Digitally Re-Programmable (LT3582) Via I2C for:

Output Voltages

Power Sequencing

Output Voltage Ramp Rates

Power-up Defaults Settable with Non-volatile OTP (LT3582)

I2C Compatible Interface (Standard Mode*)

All Power Switches Integrated 350mA Current Limit (Boost) 600mA Current Limit (Inverting)

All Feedback Resistors Integrated

Input Voltage Range: 2.55V to 5.5V

Low Quiescent Current 325μA in Active Mode

0.01μA in Shutdown Mode

Integrated Output Disconnect

Tiny 16-pin 3mm × 3mm QFN Package

LT3582应用:

AMOLED Power

CCD Power

General Purpose DC/DC Conversion



图1.LT3582方框图



图2.LT3582典型应电路图(1)



图3.LT3582典型应电路图(2)



图4.LT3582典型应电路图(3)



图5.LT3582典型应电路图(4)



图6.LT3582典型应用电路图:5V输入, ±12V输出