MAX17242

3.5V至36V、2A/3A、同步Buck转换器，15µA静态电流和低EMI

工作可靠(42V输入瞬态保护)、长电池寿命(15µA I_Q)和EN55022 EMI性能

概述

说明

MAX17242/MAX17243高效、同步降压型DC-DC转换器集成MOSFET，工作在3.5V至36V输入电压范围，能够以99%占空比工作在低压差条件。转换器提供高达2A (MAX17242)和3A (MAX17243)输出电流，产生3.3V/5V固定输出电压，同时具备在1V至10V范围内编程输出电压的能力。

器件采用峰值限流控制结构，也可工作在脉宽调制(PWM)或脉冲频率调制(PFM)控制模式。PWM工作模式在任何负载条件下都保持固定频率工作，在对开关频率敏感的应用中非常有用。PFM工作模式消除了负向电感电流以及轻载条件下额外的跳脉冲，实现高效工作。内置低导通电阻MOSFET确保满载时高效工作，同时也简化了布局。

器件采用20引脚(5mm x 5mm) TQFN封装，带裸焊盘。器件工作在-40°C至+85°C温度范围。

设计资源: 在线仿真器验证Buck转换器输出误差预算分析 ›

MAX17242, MAX17243: Typical Application Circuit/Block Diagram

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关键特性

无需外部元件，降低总体成本
- 无需肖特基同步二极管即可保持高效、低成本工作
- 简单的外部RC补偿，在任意输出电压下均可稳定工作
- 全陶瓷电容设计：超小尺寸布局，外部元件只有8个
PGOOD输出和高压EN输入，简化电源排序
- 减少DC-DC转换器库存清单
- 2A/3A选项的引脚兼容
- 固定输出电压，输出精度为±2% (5V/3.3V)；或者外部电阻可调(1V至10V)输出，精度为±1% FB
- 220kHz至2.2MHz可调节频率，带外同步
降低功耗
- 效率最高达93%
- 关断功能，阻塞从输入到输出的电流或者反向电流
- 关断模式下电流小于5µA (典型值)
- 待机模式下静态电流仅为15µA (典型值)
工作可靠
- 42V输入电压瞬态保护
- 固定8ms内部软启动，降低输入浪涌电流
- 逐周期限流，自动恢复热关断
- 通过扩频控制降低EMI辐射

应用

配电稳压器
通用负载点电源
壁式变压器稳压

参数规格

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

Power Good Signal

DC-DC Outputs

Oper. Freq.
(kHz)

Design Tools

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX17242

3.5

3.3

Resistor

Internal

Yes

220

2200

EE-Sim

TQFN-CU/20

$2.19 @1k

MAX17243

TQFN-CU/20

$2.59 @1k

查看所有Step-Down Switching Regulators (367)

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。

设计资源

MAX17243EVKIT: MAX17243评估板
MAX17242EVKIT: MAX17242评估板

质量与环境

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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环境管理体系 >

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