MAX8745A

高效率、四路输出、主电源控制器,用于笔记本电脑


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说明

MAX8744A/MAX8745A是一款双路、降压型、带同步整流的开关电源(SMPS)控制器,非常适合电池供电系统,能够产生5V/3.3V主电源。在最低输入电压至26V最高输入电压范围内,器件保持固定工作频率和交错式工作,使输入纹波电流最小。经过优化的40/60交错工作方式能够在输入电压低至8.3V时不发生占空比重叠;而180°错相工作方式在输入电压降至10V时,即发生占空比重叠。

输出电流检测提供峰值限流保护,可以使用精密的检流电阻或利用电感的DCR进行无损耗电流检测。低噪声模式能够在轻载下保持较高效率,并使开关频率在音频范围以外。

内部5V、100mA线性稳压器为MAX8744A/MAX8745A和栅极驱动器以及外部常开负载供电。当PWM调节器工作时,自举开关可自动旁路内部线性稳压器,可提供最大200mA的电流。另外一路线性稳压驱动器配合外部pnp晶体管和次级绕组能够提供12V电源,也可以直接从主电源产生低至1V的低压输出。

独立的使能控制和电源就绪信号允许灵活的电源排序。电压软启动逐步提高输出电压,以降低浪涌电流;而软关断则逐步降低输出电压,防止出现瞬间的负电压。MAX8744A/MAX8745A包括输出欠压检测和热故障保护,MAX8744A还提供过压保护功能。

MAX8744A/MAX8745A采用32引脚5mm x 5mm、薄型QFN封装。在需要不间断供电的应用中,底部裸焊盘有助于改善散热。
MAX8744A、MAX8745A:标准应用电路 MAX8744A、MAX8745A:标准应用电路 放大+

关键特性

  • 固定频率、电流控制模式控制
  • 40/60交错式工作
  • 内部BST开关
  • 内部5V、100mA线性稳压器
  • 辅助线性稳压驱动器(提供12V或最低可调至1V)
  • Dual Mode™反馈—3.3V/5V固定输出或可调输出
  • 200kHz/300kHz/500kHz开关频率
  • 欠压和热故障保护
  • 过压保护(仅MAX8744A)
  • 输入范围:6V至26V
  • 2V ±0.75%基准电压输出
  • 独立的使能输入和电源就绪输出
  • 软启动和软关断(电压线性上升/下降)
  • 关断电流:8µA (典型值)

应用

  • 2节至4节Li+电池供电设备
  • 主电源
  • 笔记本电脑和亚笔记本电脑
  • PDA与移动通信
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/Pins
minmaxminmaxmax
MAX8745A 62625.5
3.3
5
Preset
Resistor
6ExternalYesYes2500
SOIC(N)/8
查看所有Step-Down Switching Regulators (402)
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。

质量和环境数据

申请可靠性报告: MAX8745A 
无铅封装的锡(Sn)晶须报告
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。

质量管理体系 >
环境管理体系 >

 
Status:
Package:
Temperature:

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