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小型、双路、高效率buck控制器,用于笔记本电脑

产品详情

主要特征

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 20
VOUT1 (V) (min) 1
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.6
Switch Type External
Preset VOUT (V) 1.8
2.5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 350
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.12
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 20
VOUT1 (V) (min) 1
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.6
Switch Type External
Preset VOUT (V) 1.8
2.5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 350
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.12

主要特征

  • Free-Running On-Demand PWM
  • Selectable Light-Load Pulse-Skipping Operation
  • ±1% Total DC Error in Forced-PWM Mode
  • 5V to 20V Input Range
  • Flexible Output Voltages
    • OUT1: Dual Mode™ Fixed 2.5V or 1V to 5.5V Adjustable
    • OUT2: Dual Mode Fixed 1.8V or 1V to 5.5V Adjustable
  • Output Undervoltage Protection
  • Complementary Synchronous Buck
  • No Current-Sense Resistor
  • 4.65V at 25mA Linear Regulator Output
  • 4µA V+ Shutdown Supply Current
  • 5µA VL Shutdown Supply Current
  • 950µA Quiescent Supply Current
  • Tiny 16-Pin QSOP Package

应用/用途

  • 1.8V/2.5V逻辑和I/O电源
  • 数码相机
  • 手持终端
  • 笔记本电脑与PDA
  • 智能电话

描述

The MAX1761 dual pulse-width-modulation (PWM), step-down controller provides high efficiency, excellent transient response, and high DC output accuracy in an extremely compact circuit topology. These features are essential for stepping down high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in PC board area critical applications, such as notebook computers and smart phones.

Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides "instant-on" response to load transients while maintaining a relatively constant switching frequency.

The MAX1761 achieves high efficiency at reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by its ability to drive large synchronous-rectifier MOSFETs. The MAX1761 employs a complementary MOSFET output stage, which reduces component count by eliminating external bootstrap capacitors and diodes.

Single-stage buck conversion allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.

The MAX1761 is intended for CPU core, chipset, DRAM, or other low-voltage supplies. The MAX1761 is available in a 16-pin QSOP package. For applications requiring greater output power, refer to the MAX1715 data sheet. For a single-output version, refer to the MAX1762/MAX1791 data sheet.

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MAX1761:典型应用电路 MAX1761: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

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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