回到顶部

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

产品详情

主要特征

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 16.5
VOUT1 (V) (min) 2
VOUT1 (V) (max) 100
IOUT1 (A) (max) 2
Switch Type External
Preset VOUT (V) 12
Output Adjust. Method Preset
Resistor
ICC (mA) (typ) 0.085
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.13
缩小

简化框图

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

参量

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 16.5
VOUT1 (V) (min) 2
VOUT1 (V) (max) 100
IOUT1 (A) (max) 2
Switch Type External
Preset VOUT (V) 12
Output Adjust. Method Preset
Resistor
ICC (mA) (typ) 0.085
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.13

主要特征

  • 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/用途

  • 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

描述

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 110&microA 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.

简化框图

MAX1771:典型工作电路 MAX1771:典型工作电路 Zoom icon

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