MAX17122 升压/降压型调节器、栅极驱动电荷泵、boo
max17122 升压/降压型调节器、栅极驱动电荷泵、boost-buck调节器，用于tv tft lcd显示器
概述
the max17122 multiple-output power-supply ic generates all the supply rails for thin-film transistor (tft) liquid-crystal display (lcd) tv panels. it can operate from 8v to 16.5v input voltages and is optimized for lcd tv panel applications running directly from 12v regulated supplies. it includes a 22v internal-switch step-down regulator for digital logic, a 22v internal switch step-up regulator to power the tft source drivers, and a temperature- compensated 36v internal-switch boost-buck regulator that produces a negative output that can vary according to the temperature sensed by an external ntc thermistor. all three of these regulators feature high-efficiency and fixed-frequency operation. high-frequency operation allows the use of small inductors and capacitors, resulting in a compact solution.
the max17122 includes a positive charge-pump linear regulator controller that uses an external pnp bipolar junction transistor (bjt) to typically form a regulated charge-pump doubler to supply the lcd positive gatedriver supply voltage. a negative gate-driver supply is derived linearly between the boost-buck regulator’s output and ground, using an external npn bjt connected to ground and a small bypass capacitor.
other features include an external-capacitor-timed, open-drain, power-good output that monitors the step-down regulator’s feedback and a simple untimed output that monitors the positive charge-pump linear regulator’s feedback. a high-voltage stress function is available for the step-up regulator output. the gate output directly drives an external p-channel mosfet to provide true shutdown™ of the step-up output.
the max17122 is available in a 6mm x 6mm, 40-pin thin qfn package and operates over the -40°c to +85°c temperature range.
关键特性
8v to 16.5v operating range 750khz switching frequency 22v internal-switch high-performance step-up regulator fast load-transient response current-mode pwm operation 100mω, 3.9a nmos switch capacitor-adjustable soft-start high-voltage stress function drives external pmos shutdown switch 22v internal-switch step-down regulator preset 1% accurate 3.3v output voltage or adjustable output (dual mode™) current-mode pwm operation 200mω, 2.5a nmos switch capacitor-adjustable power-good output 36v internal-switch boost-buck regulator temperature-compensated output programmable fixed levels with temperature- controlled transition current-mode pwm operation 200mω, 1.8a pmos switch positive charge-pump linear regulator controller adjustable 1% accurate output voltage uses external pnp transistor regulates switching-node-driven charge- pump doubler power-good output negative linear regulator controller adjustable 1.5% accurate output voltage uses external npn transistor soft-start for all outputs adjustable power-up sequence timed-output fault protection with restart for all outputs latched thermal-shutdown protection 40-pin, 6mm x 6mm thin qfn package 应用/使用
lcd tv板
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概述
the max17122 multiple-output power-supply ic generates all the supply rails for thin-film transistor (tft) liquid-crystal display (lcd) tv panels. it can operate from 8v to 16.5v input voltages and is optimized for lcd tv panel applications running directly from 12v regulated supplies. it includes a 22v internal-switch step-down regulator for digital logic, a 22v internal switch step-up regulator to power the tft source drivers, and a temperature- compensated 36v internal-switch boost-buck regulator that produces a negative output that can vary according to the temperature sensed by an external ntc thermistor. all three of these regulators feature high-efficiency and fixed-frequency operation. high-frequency operation allows the use of small inductors and capacitors, resulting in a compact solution.
the max17122 includes a positive charge-pump linear regulator controller that uses an external pnp bipolar junction transistor (bjt) to typically form a regulated charge-pump doubler to supply the lcd positive gatedriver supply voltage. a negative gate-driver supply is derived linearly between the boost-buck regulator’s output and ground, using an external npn bjt connected to ground and a small bypass capacitor.
other features include an external-capacitor-timed, open-drain, power-good output that monitors the step-down regulator’s feedback and a simple untimed output that monitors the positive charge-pump linear regulator’s feedback. a high-voltage stress function is available for the step-up regulator output. the gate output directly drives an external p-channel mosfet to provide true shutdown™ of the step-up output.
the max17122 is available in a 6mm x 6mm, 40-pin thin qfn package and operates over the -40°c to +85°c temperature range.
关键特性
8v to 16.5v operating range 750khz switching frequency 22v internal-switch high-performance step-up regulator fast load-transient response current-mode pwm operation 100mω, 3.9a nmos switch capacitor-adjustable soft-start high-voltage stress function drives external pmos shutdown switch 22v internal-switch step-down regulator preset 1% accurate 3.3v output voltage or adjustable output (dual mode™) current-mode pwm operation 200mω, 2.5a nmos switch capacitor-adjustable power-good output 36v internal-switch boost-buck regulator temperature-compensated output programmable fixed levels with temperature- controlled transition current-mode pwm operation 200mω, 1.8a pmos switch positive charge-pump linear regulator controller adjustable 1% accurate output voltage uses external pnp transistor regulates switching-node-driven charge- pump doubler power-good output negative linear regulator controller adjustable 1.5% accurate output voltage uses external npn transistor soft-start for all outputs adjustable power-up sequence timed-output fault protection with restart for all outputs latched thermal-shutdown protection 40-pin, 6mm x 6mm thin qfn package 应用/使用
lcd tv板
楼宇自动化控制网络数据通信协议BACnet
阿里巴巴将于今年发布首款自研NPU，称性能领先10倍
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MAX17122 升压/降压型调节器、栅极驱动电荷泵、boo
处理器如何实现从PC转移到手机的时代转变
三星“卷轴”折叠屏手机概念视频曝光
希捷通过收购东芝部分股权加强SSD布局
液晶电视优势集中在75英寸以下 激光电视想壮大还需差异化应用场景
8BitDo推出迷你体型的Zero2蓝牙手柄，具有三种颜色款式
120V转12KV电源电路原理图
一键式测量仪与二次元如何选择？
锂电池包好坏怎么判断
工业机器视觉系统中光源设计应用
什么是USB Type-C？PCB布局布线介绍
保护薄膜瑕疵检测仪的原理、参数及功能
增量型编码器与绝对型编码器的区别
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LG增加投资以提高iPhone相机模块产能