MAX868

稳压型、可调节、-2倍压反相电荷泵

无电感稳压器,用于LCD偏置电源


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说明

The MAX868 inverting charge pump provides a low-cost and compact means of generating a regulated negative voltage up to -2 x VIN from a positive input voltage between 1.8V and 5.5V. It uses a pulse-frequency-modulation (PFM) control scheme to generate the regulated negative output voltage. PFM operation is obtained by gating the internal 450kHz oscillator on and off as needed to maintain output voltage regulation. This unique on-demand switching scheme gives the MAX868 excellent light-load efficiency without degrading its full-load operation (up to 30mA), permitting smaller capacitors to take advantage of the oscillator's high switching frequency.

The MAX868 requires no inductors; only four capacitors are required to build a complete DC-DC converter. Output voltage regulation is achieved by adding just two resistors. The MAX868 comes in a 10-pin µMAX® package, which is only 1.11mm high and occupies just half the board area of a standard 8-pin SO.
MAX868:典型工作电路 MAX868:典型工作电路 放大+

关键特性

  • Regulated Negative Output Voltage (up to -2 x VIN)
  • Ultra-Small, 10-Pin µMAX Package
  • On-Demand Switching at up to 450kHz
  • 30µA Quiescent Supply Current
  • Requires Only Four Small External Capacitors
  • 1.8V to 5.5V Input Voltage Range
  • 0.1µA Logic-Controlled Shutdown
  • Up to 30mA Output Current
  • Adjustable output voltage

应用

  • 电池供电应用
  • 便携式摄像机
  • 蜂窝电话
  • 无绳电话
  • 手持终端、PDA
  • 医疗仪器
  • 小型LCD板

请查看具体的参数规格 Charge Pumps (45)


Part NumberTopologyVIN
(V)
VIN
(V)
ICC
(mA)
Unadj. VOUT
(V)
Adj. VOUT
(V)
Adj. VOUT
(V)
IOUT
(A)
Oper. Freq.
(kHz)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxmaxminmaxtypSee Notes
MAX868 
Inverter
Regulated
1.85.50.05-2xVIN-2xVIN00.03450-40 to +85
UMAX/10
$1.54 @1k

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。
产品可靠性报告: MAX868.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

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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