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微型、低电压、高精度降压型控制器

低电压、高精度降压控制器,用于便携式CPU供电

产品详情

主要特征

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 6
VIN (V) (max) 26
VOUT1 (V) (min) 1.1
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.1
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 350
Package/Pins QSOP/16
Budgetary
Price (See Notes)
5.09

简化框图

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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 6
VIN (V) (max) 26
VOUT1 (V) (min) 1.1
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.1
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 350
Package/Pins QSOP/16
Budgetary
Price (See Notes)
5.09

主要特征

  • ±2% DC Accuracy
  • 0.1% (typ) DC Load Regulation
  • Adjustable Switching Frequency to 350kHz
  • Idle Mode™ Pulse-Skipping Operation
  • 1.10V to 5.5V Adjustable Output Voltage
  • 3.15V Minimum IC Supply Voltage (at VCC pin)
  • Internal Digital Soft-Start
  • 1.1V ±2% Reference Output
  • 1µA Total Shutdown Current
  • Output Overvoltage Crowbar Protection
  • Output Undervoltage Shutdown (foldback)
  • Tiny 16-Pin QSOP Package

应用/用途

  • 手持终端、PDA
  • 笔记本电脑
  • 亚笔记本电脑

描述

The MAX1637 synchronous, buck, switch-mode power-supply controller generates the CPU supply voltage in battery-powered systems. The MAX1637 is a stripped-down version of the MAX1636 in a smaller 16-pin QSOP package. The MAX1637 is intended to be powered separately from the battery by an external bias supply (typically the +5V system supply) in applications where the battery exceeds 5.5V. The MAX1637 achieves excellent DC and AC output voltage accuracy. This device can operate from a low input voltage (3.15V) and delivers the excellent load-transient response needed by upcoming generations of dynamic-clock CPUs.

Using synchronous rectification, the MAX1637 achieves up to 95% efficiency. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Powerful 1A on-board gate drivers ensure fast external N-channel MOSFET switching.

The MAX1637 features a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. Asserting the SKIP-bar pin enables fixed-frequency mode, for lowest noise under all load conditions. For a stand-alone device that includes a +5V VL linear regulator and low-dropout capabilities, refer to the MAX1636 data sheet.

简化框图

MAX1637:典型工作电路 MAX1637:典型工作电路 Zoom icon

Technical Docs

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