LTC1682IS8-5#PBF

LTC®1682 is a doubler charge pumps with an internal low noise, low dropout (LDO) linear regulator. This part is designed to provide a low noise boosted supply voltage for powering noise sensitive devices such as high frequency VCOs in wireless applications. An internal doubler charge pump converts a 1.8V to 4.4V input to a boosted output, while the internal LDO regulator converts the boosted voltage to a low noise regulated output. The adjustable version allows the user to set VOUT via external resistors connected to FB. Shutdown reduces the supply current to <lt/> 5µA, removes the load from VIN by disabling the regulator and discharges VOUT to ground through a 100 ohm switch. This LDO regulator is stable with only 2µF on the output. Small ceramic capacitors can be used, reducing PC board area. Typical applications are VCO power supplies in cellular phones, 2-way pagers, wireless PCMCIA cards, portable medical instruments, low power data acquisition, remote transmitters.

• Low output noise: 60µVRMS (100KHz BW)
• Uses small ceramic capacitors
• No inductors required, output current up to 50mA
• 550KHz switching frequency, low operating current: 150µA
• Low shutdown current: 1µA, internal thermal shutdown and current limiting
• VIN operating voltage range from 2.7 to 4.4V (TA=25°C)
• IVIN operating current is 250µA (0°C to 70°C, TA=25°C. C1=0.22µF; C2, C3, C4=4.7µF)
• 8-lead plastic SO package
• Industrial operating temperature range from –40°C to 85°C

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