MAX840,MAX843,MAX844稳压型GaAsFET偏置电源应用电路
max840, max843, max844稳压型gaasfet偏置电源应用电路
概述
the max840/max843/max844 low-noise, inverting charge-pump power supplies are ideal for biasing gaasfets in cellular telephone transmitter amplifiers. they operate with inputs down to 2.5v.
the max840 offers both a -2v preset output and a -0.5v to -9.4v adjustable output. the max843/max844 use an external positive control voltage to set the negative output voltage. input voltage range for all the devices is 2.5v to 10v, and output current is 4ma with vin > 2.7v. these circuits can operate with small capacitors, as low as 0.22µf.
an internal linear regulator reduces the max840's output voltage ripple to 1mvp-p. with a well-filtered control voltage (vctrl), the max843/max844 also achieve less than 1mvp-p typical output ripple. supply current is 750µa, and reduces to less than 1µa in shutdown (max840/max843). the max844's unregulated output is active in shutdown, with the charge pump switching at 20khz. it provides a low-power lcd supply.
关键特性
fixed -2v or adjustable -0.5v to -9.4v output at 4ma (max840)
2.5v to 10v input voltage range
operate with small capacitors (as low as 0.22µf)
1mvp-p output voltage ripple
charge-pump switching frequency:
100khz in normal operation
20khz in shutdown mode (max844)
1µa max logic-level shutdown over temp. (max840/max843)
small 8-pin so package
应用/使用
蜂窝电话
连续可调的gaasfet偏置
gaasfet功率放大器模块
lcd偏置对比度控制
个人通信装置、pda
稳定的负电源
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概述
the max840/max843/max844 low-noise, inverting charge-pump power supplies are ideal for biasing gaasfets in cellular telephone transmitter amplifiers. they operate with inputs down to 2.5v.
the max840 offers both a -2v preset output and a -0.5v to -9.4v adjustable output. the max843/max844 use an external positive control voltage to set the negative output voltage. input voltage range for all the devices is 2.5v to 10v, and output current is 4ma with vin > 2.7v. these circuits can operate with small capacitors, as low as 0.22µf.
an internal linear regulator reduces the max840's output voltage ripple to 1mvp-p. with a well-filtered control voltage (vctrl), the max843/max844 also achieve less than 1mvp-p typical output ripple. supply current is 750µa, and reduces to less than 1µa in shutdown (max840/max843). the max844's unregulated output is active in shutdown, with the charge pump switching at 20khz. it provides a low-power lcd supply.
关键特性
fixed -2v or adjustable -0.5v to -9.4v output at 4ma (max840)
2.5v to 10v input voltage range
operate with small capacitors (as low as 0.22µf)
1mvp-p output voltage ripple
charge-pump switching frequency:
100khz in normal operation
20khz in shutdown mode (max844)
1µa max logic-level shutdown over temp. (max840/max843)
small 8-pin so package
应用/使用
蜂窝电话
连续可调的gaasfet偏置
gaasfet功率放大器模块
lcd偏置对比度控制
个人通信装置、pda
稳定的负电源
无线数据记录仪
杂质度过滤机的特点介绍
玩家想要获得最佳的PC游戏体验要靠什么
千元买小米6服不服？同样四曲面玻璃，还有无边框！
Telus将无线数据传输速度提高一倍至42mbps
Pico于NuEyes联合为视障人士发布了一款VR一体机设备
MAX840,MAX843,MAX844稳压型GaAsFET偏置电源应用电路
新能源汽车全面取代燃油汽车成为未来出行交通工具的倒计时开始
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【强力巨彩·头条】上半年营收过亿，这几家新三板照企水平如何？
ST发布下一代iNEMO引擎
助力OPPO、vivo品牌开拓海外市场，联发科靠的是什么？
突破技术推出新款无线充电器TU0010，支持8mm隔空充电
PLC数据通讯网关手机监控巨控GRM530 GRM300方案
工业以太网交换机如何应用在水泥厂
威马W6将支持AVP自动泊车功能 公共停车场也能用
中兴事件后，中国作为全球最大的半导体消费市场，芯片国产化进程迫在眉睫
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