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双输出电源控制器,用于笔记本电脑

3.3V、5V双输出笔记本电脑电源,以高于> 90%的效率提供高达50W的功率

产品详情

主要特征

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 5.5
VIN (V) (max) 30
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 5
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 300
Package/Pins SSOP/28
Budgetary
Price (See Notes)
6.19
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 5.5
VIN (V) (max) 30
VOUT1 (V) (min) 3.3
VOUT1 (V) (max) 5
IOUT1 (A) (max) 5
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 300
Package/Pins SSOP/28
Budgetary
Price (See Notes)
6.19

主要特征

  • Dual PWM Buck Controllers (+3.3V and +5V)
  • Two Precision Comparators or Level Translators
  • 95% Efficiency
  • 420µA Quiescent Current, 70µA in Standby (linear regulators alive)
  • 25µA Shutdown Current (+5V linear alive)
  • 5.5V to 30V Input Range
  • Small SSOP Package
  • Fixed Output Voltages:
    • 3.3V (standard)
    • 3.45V (High-Speed Pentium®)
    • 3.6V (PowerPC®)

应用/用途

  • 通信系统
  • 笔记本电脑
  • 笔输入系统
  • 便携式数据终端

描述

The MAX786 is a system-engineered power-supply controller for notebook computers or similar battery-powered equipment. It provides two high-performance step-down (buck) pulse-width modulators (PWMs) for +3.3V and +5V. Other features include dual, low-dropout, micropower linear regulators for CMOS/RTC back-up, and two precision low-battery-detection comparators.

High efficiency (95% at 2A; greater than 80% at loads from 5mA to 3A) is achieved through synchronous rectification and PWM operation at heavy loads, and Idle Mode™ operation at light loads. The MAX786 uses physically small components, thanks to high operating frequencies (300kHz/200kHz) and a new current-mode PWM architecture that allows for output filter capacitors as small as 30µF per ampere of load. Line- and load-transient responses are terrific, with a high 60kHz unity-gain crossover frequency allowing output transients to be corrected within four or five clock cycles. Low system cost is achieved through a high level of integration and the use of low-cost, external N-channel MOSFETs.

Other features include low-noise, fixed-frequency PWM operation at moderate to heavy loads, and a synchronizable oscillator for noise-sensitive applications such as electromagnetic pen-based systems and communicating computers. The MAX786 is a monolithic, BiCMOS IC available in fine-pitch, surface-mount SSOP packages.

简化框图

MAX786、MAX786R、MAX786S:典型应用电路 MAX786、MAX786R、MAX786S:典型应用电路 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