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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

产品详情

主要特征

Parametric specs for Charge Pumps
Topology Inverter
Regulated
VIN (V) (min) 1.8
VIN (V) (max) 5.5
IOUT (A) (typ) 0.03
Unadj. VOUT (V) -2xVIN
Adj. VOUT (V) (min) -2xVIN
Adj. VOUT (V) (max) 0
ICC (mA) (max) 0.05
Switching Frequency (kHz) 450
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.63
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参量

Parametric specs for Charge Pumps
Topology Inverter
Regulated
VIN (V) (min) 1.8
VIN (V) (max) 5.5
IOUT (A) (typ) 0.03
Unadj. VOUT (V) -2xVIN
Adj. VOUT (V) (min) -2xVIN
Adj. VOUT (V) (max) 0
ICC (mA) (max) 0.05
Switching Frequency (kHz) 450
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.63

主要特征

  • 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/用途

  • 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

描述

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.

简化框图

MAX868:典型工作电路 MAX868:典型工作电路 Zoom icon

Technical Docs

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在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心