MAX77231

2.75V至4.8V输入、10mA输出、35µVRMS 超低噪声和纹波升压调节器

小尺寸升压器,纹波和噪声仅35µVRMS


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说明

MAX77231针对要求极低纹波/噪声和小PCB空间的升压应用进行优化。PMOS线性后置调节器设置为比升压调节器低0.5V,以抑制噪声并优化效率,从而将输出纹波和噪声限制到35µVRMS (1MHz BW)。

升压调节器采用1µH/400mA电感和2.2µF (将额后为0.22 (最小值))输出电容进行操作。采用限流PFM结构可保证快速瞬态响应和稳定操作。

在向负载提供11.2V之前,PMOS低噪声线性后置调节器将升压转换器纹波衰减大约50dB (10MHz BW)。可由工厂设置为最高16.2V的其它电压。关断期间,LDO也将负载从升压器断开,允许输出下降到0V (真关断)。也可激活主动放电。

MAX77231采用9焊球晶圆级封装(WLP),与电感和外部电容配合时,可提供紧凑的布局。方案总尺寸小于7mm2

MAX77231: Block Diagram MAX77231:Block Diagram 放大+

关键特性

  • 超小方案尺寸(< 7mm2)
  • 35µVRMS (典型值)输出纹波/噪声
  • 11.2V/10mA输出
  • 工厂校准的11.2V至16.2V输出
  • 125µA空载电流输出,关断电流小于1µA
  • 真关断负载断开
  • 可选有源放电
  • 9焊球、1.238mm x 1.238mm x 0.35mm WLP封装

应用

  • 低噪声偏置电源
  • 传感器偏置电源
Part NumberVIN
(V)
VIN
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypeSynchronous SwitchingICC
(mA)
Shutdown Mode Supply Current
(µA)
Shutdown Mode Supply Current
(µA)
DC-DC OutputsOper. Freq.
(kHz)
Design ToolsPackage/PinsBudgetary
Price
minmaxtyptypmaxSee Notes
MAX77231 2.74.8120.01PresetInternalYes0.120.01112000EE-Sim
ULTRA THIN WLP/9
$1.16 @1k
查看所有Step-Up Switching Regulators (94)
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。


MAX77231EVKIT: MAX77231评估板

质量和环境数据

产品可靠性报告: MAX77231.pdf 
无铅封装的锡(Sn)晶须报告

工具和模型

  • EE-Sim: MAX77231 设计和仿真
  • MAX77231 SIMPLIS Schematic
  • CAD Symbols and Footprints

  • MAX77231EZL+
  • MAX77231EZL+T
  • 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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