MAX8625A

高效、无缝切换升/降压型DC-DC转换器

无扰动、稳定的升/降压H桥转换器


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说明

MAX8625A PWM升/降压调节器是针对便携式电池供电设备中的数字逻辑电路、硬盘驱动、电机及其它负载供电而设计,适用于PDA、蜂窝电话、数码相机(DSC)、MP3播放器等产品。MAX8625A在2.5V至5.5V输入范围内可提供固定3.3V或可调(1.25V至4V)输出,电流高达0.8A。MAX8625A采用2A峰值限流。

Maxim的H桥技术在所有工作模式下可提供无缝切换,消除了其它器件中存在的尖峰干扰。4个内部MOSFET (2个开关和2个同步整流器)提供内部补偿,大大减少了外部元件数。/SKIP输入用于选择低噪声、固定频率PWM模式或高效跳脉冲模式。如果选择跳脉冲模式,轻载时转换器将自动切换至PFM模式,进一步提高轻载效率。内部振荡器工作在1MHz,允许使用小尺寸外部电感和电容。

MAX8625A的限流电路在输出过载时关断器件。此外,软启动功能有助于抑制启动过程的浪涌电流。该器件还具有True Shutdown™功能,器件禁用时,断开输入端与输出端的连接。MAX8625A采用3mm x 3mm、14引脚TDFN封装。
MAX8625:典型工作电路 MAX8625:典型工作电路 放大+

关键特性

  • 4个内部MOSFET实现真正的H桥buck/boost转换
  • Buck、boost之间无扰动切换
  • 切换过程中输出纹波变化最小
  • 效率高达92%
  • 跳脉冲模式下,静态电流只有37µA (典型值)
  • 输入范围:2.5V至5.5V
  • 固定3.3V输出或输出可调
  • 1µA (最大值)逻辑控制关断
  • True Shutdown
  • 输出过载保护
  • 内部补偿
  • 内部软启动
  • 1MHz开关频率
  • 热过载保护
  • 小尺寸3mm x 3mm、14引脚TDFN封装

应用

  • 电池供电的硬盘驱动器(HDD)
  • DSC和便携式摄像机
  • MP3播放器和蜂窝电话
  • PDA与智能电话
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
IOUT1
(A)
Output Adjust. MethodSwitch TypeSynchronous SwitchingICC
(mA)
DC-DC OutputsOper. Freq.
(kHz)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
minmaxminmaxmaxSee Notes
MAX8625 2.55.51.2543.30.80.8
Preset
Resistor
InternalYes0.04511000
TDFN/14
-40 to +85$2.76 @1k
查看所有Step-Down/Up Switching Regulators (30)
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。


MAX8625AEVKIT: MAX8625A评估板

技术资料

设计指南 5133 Power-Supply Solutions for Altera FPGAs
设计指南 5132 Power-Supply Solutions for Xilinx FPGAs
设计指南 671 Energy Management for Small Portable Systems

质量和环境数据

申请可靠性报告: MAX8625A 
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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