MAX1692:低噪声、5.5V输入、PWM降压型稳压器

微小的开关控制器,提供600mA驱动,性能指标比LDO提高10倍

The MAX1692 is a low-noise, pulse-width-modulated (PWM), DC-DC step-down converter. It powers logic and transmitters in small wireless systems such as cellular phones, communicating PDAs, and handy-terminals. The device features an internal synchronous rectifier for high efficiency; it requires no external Schottky diode. Excellent noise characteristics and fixed-frequency operation provide easy post-filtering. The MAX1692 is ideally suited for Li-Ion battery applications. It is also useful for +3V or +5V fixed input applications. The device operates in one of four modes. Forced PWM mode operates at a fixed frequency regardless of the load. Synchronizable PWM mode allows an external switching frequency to control and minimize harmonics. Idle Mode™ (PWM/PFM) extends battery life by switching to a PFM pulse-skipping mode during light loads. Shutdown mode places the device in standby, reducing quiescent supply current to under 0.1µA. The MAX1692 can deliver over 600mA. The output voltage can be adjusted from 1.25V to VIN with the input range of +2.7V to +5.5V. Other features of the MAX1692 include high efficiency, low dropout voltage, and a 1.2%-accurate 1.25V reference. It is available in a space-saving 10-pin µMAX package with a height of only 1.11mm.

关键特性
  • +2.7V to +5.5V Input Range
  • Adjustable Output from 1.25V to VIN
  • 600mA Guaranteed Output Current
  • 95% Efficiency
  • No Schottky Diode Required
  • 85µA Quiescent Current
  • 100% Duty Cycle in Dropout
  • 750kHz Fixed-Frequency PWM Operation
  • Synchronizable Switching Frequency
  • Accurate Reference: 1.25V (±1.2%)
  • Small 10-Pin µMAX Package
MAX1692:典型工作电路
MAX1692:典型工作电路
应用
  • 电池供电设备(1节Li+或3节NiMH/NiCd)
  • 蜂窝电话
  • 无绳电话
  • CPU I/O电源
  • 笔记本电脑芯片组电源
  • PDA与手持终端
数据手册DataSheet
语言下载文件备注
英文MAX1692.pdfRev 0; 11/1998
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX16922.75.51.255.5
  • Preset
  • Resistor
0.6InternalYes1750µMAX/10$2.71 @1k
开发工具
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
MAX1692EUB停止供货MAX1692EUB+µMAX,;10引脚;15.4mm²-40°C至+85°CRoHS/无铅:否
MAX1692EUB+生产中µMAX,;10引脚;15.4mm²-40°C至+85°CRoHS/无铅:无铅
MAX1692EUB+T生产中µMAX,;10引脚;15.4mm²-40°C至+85°CRoHS/无铅:无铅
MAX1692EUB-T停止供货MAX1692EUB+TµMAX,;10引脚;15.4mm²-40°C至+85°CRoHS/无铅:否
MAX1692.pdf MAX1692
MAX1692.pdf MAX1692
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典型工作电路 MAX1692