MAX857

3.3V/5V或可调输出、升压型DC-DC转换器


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说明

The MAX856-MAX859 are high-efficiency, CMOS, step-up, DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX856/MAX858 accept a positive input voltage between 0.8V and VOUT and convert it to a higher, pin-selectable output voltage of 3.3V or 5V. The MAX857/MAX859 adjustable versions accept 0.8V to 6.0V input voltages and generate higher adjustable output voltages in the 2.7V to 6.0V range. Typical efficiencies are greater than 85%. Typical quiescent supply current is 25µA (1µA in shutdown).

The MAX856-MAX859 combine ultra-low quiescent supply current and high efficiency to give maximum battery life. An internal MOSFET power transistor permits high switching frequencies. This benefit, combined with internally set peak inductor current limits, permits the use of small, low-cost inductors. The MAX856/MAX857 have a 500mA peak inductor current limit. The MAX858/MAX859 have a 125mA peak inductor current limit.
MAX856、MAX857、MAX858、MAX859:典型工作电路 MAX856、MAX857、MAX858、MAX859:典型工作电路 放大+

关键特性

  • 0.8V to 6.0V Input Supply Voltage
  • 0.8V Typ Start-Up Supply Voltage
  • 85% Efficiency at 100mA
  • 25µA Quiescent Current
  • 1µA Shutdown Mode
  • 125mA and 500mA Switch-Current Limits Permit Use of Low-Cost Inductors
  • Up to 500kHz Switching Frequency
  • ±1.5% Reference Tolerance Over Temperature
  • Low-Battery Detector (LBI/LBO)
  • 8-Pin SO and µMax Packages

应用

  • 2节和3节电池供电设备
  • 3.3V至5V升压转换
  • 血糖表
  • 医疗仪表
  • 掌上电脑
  • 个人数据通信/计算机
  • 便携式数据收集设备
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypePower Good SignalICC
(mA)
Shutdown Mode Supply Current
(µA)
Shutdown Mode Supply Current
(µA)
DC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxtyptypmaxSee Notes
MAX856 0.863.35
3.3
5
0.15PresetInternalYes0.025151500
PDIP/8
SOIC (N)/8
UMAX/8
$2.38 @1k
MAX857 2.76-0.15Resistor
PDIP/8
SOIC (N)/8
$2.30 @1k
MAX858 3.35
3.3
5
0.06Preset
PDIP/8
SOIC (N)/8
$2.30 @1k
MAX859 2.76-0.06Resistor
PDIP/8
SOIC (N)/8
UMAX/8
$2.38 @1k
查看所有Step-Up Switching Regulators (97)
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。


MAX856EVKIT: MAX856评估板
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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类型 编号 标题
评估板1208MAX856EVKIT MAX856评估板