MAX1771

12V或可调、高效率、低IQ、升压型DC-DC控制器

低压输入时提供高效转换,降低噪声


概述

The MAX1771 step-up switching controller provides 90% efficiency over a 30mA to 2A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives this device the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters).

This controller uses miniature external components. Its high switching frequency (up to 300kHz) allows surface-mount magnetics of 5mm height and 9mm diameter. It accepts input voltages from 2V to 16.5V. The output voltage is preset at 12V, or can be adjusted using two resistors.

The MAX1771 optimizes efficiency at low input voltages and reduces noise by using a single 100mV current-limit threshold under all load conditions. A family of similar devices, the MAX770-MAX773, trades some full-load efficiency for greater current-limit accuracy; they provide a 200mV current limit at full load, and switch to 100mV for light loads.

The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs. An evaluation kit is available.
MAX1771:典型工作电路 MAX1771:典型工作电路 放大+

关键特性

  • 90% Efficiency for 30mA to 2A Load Currents
  • Up to 24W Output Power
  • 110µA (max) Supply Current
  • 5µA (max) Shutdown Current
  • 2V to 16.5V Input Range
  • Preset 12V or Adjustable Output Voltage
  • Current-Limited PFM Control Scheme
  • Up to 300kHz Switching Frequency
  • Evaluation Kit Available

应用

  • 电池供电应用
  • 闪存编程
  • 大功率射频功放电源
  • 掌上电脑/手持终端
  • 便携式通信装置
  • LCD正偏置发生器
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. Method Switch Type ICC
(mA)
Shutdown Mode Supply Current
(µA)
DC-DC Outputs Oper. Freq.
(kHz)
Package/Pins Budgetary
Price
min max min max max typ max See Notes
MAX1771  2 16.5 2 100 12 2
Preset
Resistor
External 0.085 5 1 300
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$1.91 @1k
查看所有Step-Up Switching Regulators (94)
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。


MAX1771EVKIT: MAX1771评估板

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