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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

产品详情

主要特征

应用/用途

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.6
Switch Type Internal
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 750
Package/Pins UMAX/10
Budgetary
Price (See Notes)
3.1
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.6
Switch Type Internal
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 750
Package/Pins UMAX/10
Budgetary
Price (See Notes)
3.1

主要特征

  • +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

应用/用途

  • 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

描述

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.

简化框图

MAX1692:典型工作电路 MAX1692:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心