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24V内置开关、100%占空比、降压型转换器

产品详情

The MAX1836/MAX1837 high-efficiency step-down converters provide a preset 3.3V or 5V output voltage from supply voltages as high as 24V. Using external feedback resistors, the output voltage can be adjusted from 1.25V to VIN. An internal current-limited switching MOSFET delivers load currents up to 125mA (MAX1836) or 250mA (MAX1837).

The unique current-limited control scheme, operating with duty cycles up to 100%, minimizes the dropout voltage (120mV at 100mA). Additionally, this control scheme reduces supply current under light loads to 12µA. High switching frequencies allow the use of tiny surface-mount inductors and output capacitors.

The MAX1836/MAX1837 step-down converters with internal switching MOSFETs are available in 6-pin SOT23 and 3mm x 3mm TDFN packages, making them ideal for low-cost, low-power, space-sensitive applications. For increased output drive capability, use the MAX1776 step-down converter that uses an internal 24V switch to deliver up to 500mA. For even higher currents, use the MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W.

主要特征

  • 4.5V to 24V Input Voltage Range
  • Preset 3.3V or 5V Output
  • Adjustable Output from 1.25V to VIN
  • Output Currents Up to 125mA (MAX1836) or 250mA (MAX1837)
  • Efficiency Over 90%
  • 12µA Quiescent Current
  • 3µA Shutdown Current
  • 100% Maximum Duty Cycle for Low Dropout
  • Small 6-Pin SOT23 and TDFN Packages

应用/用途

  • 4mA至20mA环路供电
  • 9V电池系统
  • 备用电源
  • 分布式供电系统
  • 手持式设备
  • 工业控制电源
  • 笔记本电脑
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 24
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 24
IOUT1 (A) (max) 0.25
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 200
Design Tools EE-Sim
Package/Pins SOT23/6
TDFN/6
Budgetary
Price (See Notes)
$2.17 @1k
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简化框图

MAX1836、MAX1837:典型工作电路 MAX1836、MAX1837:典型工作电路 Zoom icon

技术文档

设计与质量

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描述

The MAX1837 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that demonstrates the performance of the MAX1837 step-down DC-DC converter. The EV kit provides a +3.3V output from a +4.5V to +24.0V input and can deliver up to 250mA of load current. The EV kit circuit includes the MAX1837EUT33 DC-DC converter, which is preset to regulate the output voltage to +3.3V but can be reconfigured to output voltages in the +1.25V to +5.5V range. This EV kit can also be used to evaluate other preset voltage parts in the MAX1836/ MAX1837 family.

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特征

  • Preset +3.3V Output Voltage
  • 250mA Output Current
  • +4.5V to +24.0V Input Voltage Range
  • Adjustable Output Voltages (+1.25 to +5.5V)
  • Low 12µA (typ) Quiescent Supply Current
  • Surface-Mount Construction
  • Fully Assembled and Tested

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工具和模型

EE-Sim: 设计和仿真MAX1837

创建设计

支持和培训

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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 24
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 24
IOUT1 (A) (max) 0.25
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 200
Design Tools EE-Sim
Package/Pins SOT23/6
TDFN/6
Budgetary
Price (See Notes)
$2.17 @1k

主要特征

  • 4.5V to 24V Input Voltage Range
  • Preset 3.3V or 5V Output
  • Adjustable Output from 1.25V to VIN
  • Output Currents Up to 125mA (MAX1836) or 250mA (MAX1837)
  • Efficiency Over 90%
  • 12µA Quiescent Current
  • 3µA Shutdown Current
  • 100% Maximum Duty Cycle for Low Dropout
  • Small 6-Pin SOT23 and TDFN Packages

应用/用途

  • 4mA至20mA环路供电
  • 9V电池系统
  • 备用电源
  • 分布式供电系统
  • 手持式设备
  • 工业控制电源
  • 笔记本电脑

描述

The MAX1836/MAX1837 high-efficiency step-down converters provide a preset 3.3V or 5V output voltage from supply voltages as high as 24V. Using external feedback resistors, the output voltage can be adjusted from 1.25V to VIN. An internal current-limited switching MOSFET delivers load currents up to 125mA (MAX1836) or 250mA (MAX1837).

The unique current-limited control scheme, operating with duty cycles up to 100%, minimizes the dropout voltage (120mV at 100mA). Additionally, this control scheme reduces supply current under light loads to 12µA. High switching frequencies allow the use of tiny surface-mount inductors and output capacitors.

The MAX1836/MAX1837 step-down converters with internal switching MOSFETs are available in 6-pin SOT23 and 3mm x 3mm TDFN packages, making them ideal for low-cost, low-power, space-sensitive applications. For increased output drive capability, use the MAX1776 step-down converter that uses an internal 24V switch to deliver up to 500mA. For even higher currents, use the MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W.

简化框图

MAX1836、MAX1837:典型工作电路 MAX1836、MAX1837:典型工作电路 Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索您所需的答案。

过滤搜索

Maxim专业的应用工程师团队也可以为您解答技术问题,请 访问Maxim的 支持中心