MAX768CSLASHD中文資料美信數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

General Description

The MAX768 low-noise, dual-output, regulated charge pump provides a negative output for biasing GaAsFET power amplifiers, and a positive output for powering voltage-controlled oscillators (VCOs) in wireless handsets. The outputs can also be used to power LCDs. Output ripple is less than 2mVp-p. The MAX768 is intended for use in low-voltage systems where a simple charge-pump inverter is inadequate, or where the VCO needs more range to improve its signal-to-noise ratio. The input range is 2.5V to 5.5V, enabling direct power from 1Li+ and 3-cell NiMH/NiCd batteries.

Features

? Dual Positive/Negative Regulated Outputs: ±5VOUT from 3VIN

? Output-Ready Indicator to Protect GaAsFET PAs

? 2.5V to 5.5V Input Voltage Range

? Low-Noise Output Ripple: < 2mVp-p

? Synchronizable Switching Frequency

? Uses Only Small, Low-Cost Capacitors

? 0.1μA Independent Shutdown Controls

? Adjustable Output Voltages

? Small 16-Pin QSOP Package

Applications

??? GaAsFET Power Amp Bias

??? Voltage-Controlled Oscillator (VCO) Supply

??? Tuner Diode Power Supply

??? Positive and Negative LCD Supply

??? Cellular Phone

??? PCS and Cordless Phone

??? Wireless Handsets

??? Wireless Handheld Computers

??? Wireless PCMCIA Cards

??? Modems