MAX1857:500mA、具有纹波抑制的LDO,µMAX封装

0.5A、低压差、具有纹波滤波的LDO,采用8引脚µMAX封装

The MAX1857 low-dropout linear regulator operates from a +2.5V to +5.5V supply and delivers a guaranteed 500mA load current with low 120mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed 4.75V or can be adjusted from 1.25V to 5.0V with an external resistive divider. An internal PMOS pass transistor allows the low 135µA supply current to remain independent of load, making this device ideal for portable battery-operated equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, base stations, and notebook computers. Other features include an active-low open-drain reset output with a 4.5ms timeout period that indicates when the output is out of regulation, a 0.1µA shutdown mode, short-circuit protection, and thermal shutdown protection. The device is available in a miniature 8-pin µMAX package. For higher power applications, refer to the MAX1792 and MAX1793 data sheets.

关键特性
  • Guaranteed 500mA Output Current
  • Low 120mV Dropout at 500mA
  • Up to ±1% Output Voltage Accuracy
    • Preset at 4.75V
    • Adjustable from 1.25V to 5.0V
  • Reset Output with 4.5ms Timeout Period
  • Low 135µA Ground Current
  • 0.1µA Shutdown Current
  • Thermal Overload Protection
  • Output Current Limit
  • Tiny µMAX Package
MAX1857:典型工作电路
MAX1857:典型工作电路
应用
  • 蜂窝电话/无绳电话
  • 坞站
  • 笔记本电脑
  • 掌上电脑
  • PDA
  • USB集线器
  • 无线基站
数据手册DataSheet
语言下载文件备注
英文MAX1857.pdfRev 0; 02/2001
关键参数
Part NumberRegulatorsVIN
(V)
VIN
(V)
Preset VOUT
(V)
Adj. VOUT
(V)
Adj. VOUT
(V)
VDROPOUT @Rated ILOAD
(V)
Rated ILOAD
(mA)
Rated ILOAD
(mA)
ICC
(µA)
Output Voltage Noise
(µV RMS)
Ref. BypassLow Batt./ Pwr. Fail OutPOK/Reset Thresh.
(V)
WatchdogReverse Batt. Protect.Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxminmaxtypmaxtypnomSee Notes
MAX185712.55.54.751.2550.12500500250115NoNoVout-14%NoNo-40 to +85µMAX/8$1.08 @1k
技术资料
质量和环境数据
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1857EUA47最后一次购买µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:否
MAX1857EUA47+生产中µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:无铅
MAX1857EUA47+T生产中µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:无铅
MAX1857EUA47-T停止供货MAX1857EUA47+TµMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:否
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