MAX1761

小型、双路、高效率buck控制器,用于笔记本电脑


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说明

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.
MAX1761:典型应用电路 MAX1761:典型应用电路 放大+

关键特性

  • 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

  • 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
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1761 4.52015.5
1.8
2.5
Preset
Resistor
0.6ExternalYes2350
QSOP/16
$3.89 @1k
查看所有Step-Down Switching Regulators (402)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

质量和环境数据

申请可靠性报告: MAX1761 
无铅封装的锡(Sn)晶须报告
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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