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5V/3.3V或可调、高效率、低压差、降压型DC-DC控制器

高效降压控制器,工作在4节至8节电池

产品详情

主要特征

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16
VOUT1 (V) (min) 1.5
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 2.5
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.37
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16
VOUT1 (V) (min) 1.5
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 2.5
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.37

主要特征

  • More than 90% Efficiency (10mA to 1.5A Loads)
  • More than 12.5W Output Power
  • Less than 0.3V Dropout Voltage at 500mA
  • 100µA Max Quiescent Supply Current
  • 5µA Max Shutdown Supply Current
  • 16V Max Input Voltage
  • 5V (MAX1649), 3.3V (MAX1651), or Adjustable Output Voltage
  • Current-Limited Control Scheme
  • Up to 300kHz Switching Frequency
  • Up to 96.5% Duty Cycle

应用/用途

  • 5V至3.3V绿色PC应用
  • 电池供电应用
  • 高效降压转换器
  • PDA

描述

The MAX1649/MAX1651 BiCMOS, step-down, DC-DC switching controllers provide high efficiency over loads ranging from 1mA to more than 2.5A. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs. 2mA to 10mA for PWM converters). Dropout performance down to 300mV is provided by a high switch duty cycle (96.5%) and a low current-sense threshold (110mV).

A high switching frequency (up to 300kHz) allows these devices to use miniature external components.

The MAX1649/MAX1651 have dropout voltages less than 0.3V at 500mA and accept input voltages up to 16V. Output voltages are preset at 5V (MAX1649), or 3.3V (MAX1651). They can also be adjusted to any voltage from 1.5V to the input voltage by using two resistors.

These step-down controllers drive external P-channel MOSFETs at loads greater than 12.5W. If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs, which allow up to a 225mA load current.

简化框图

MAX1649、MAX1651:典型工作电路 MAX1649、MAX1651:典型工作电路 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