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LTC1682-5

Linear Technology
Part Number LTC1682-5
Manufacturer Linear Technology
Description Doubler Charge Pumps
Published Mar 27, 2005
Detailed Description LTC1682/LTC1682-3.3/LTC1682-5 Doubler Charge Pumps with Low Noise Linear Regulator FEATURES s s s s s s s s s s s s s ...
Datasheet PDF File LTC1682-5 PDF File

LTC1682-5
LTC1682-5

Overview
LTC1682/LTC1682-3.
3/LTC1682-5 Doubler Charge Pumps with Low Noise Linear Regulator FEATURES s s s s s s s s s s s s s DESCRIPTIO Low Output Noise: 60µVRMS (100kHz BW) Adjustable or Fixed Boosted Output Adjustable Output Voltage Range: 2.
5V to 5.
5V Fixed Output Voltages: 3.
3V, 5V Wide Input Voltage Range: 1.
8V to 4.
4V 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 Available in 8-Pin MSOP and SO Packages U APPLICATIO S s s s s s s VCO Power Supplies in Cellular Phones 2-Way Pagers Wireless PCMCIA Cards Portable Medical Instruments Low Power Data Acquisition Remote Transmitters The LTC®1682/LTC1682-3.
3/LTC1682-5 are doubler charge pumps with an internal low noise, low dropout (LDO) linear regulator.
These parts are 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.
The regulator is capable of supplying up to 50mA of output current.
Shutdown reduces the supply current to < 5µA, removes the load from VIN by disabling the regulator and discharges VOUT to ground through a 100Ω switch.
The LTC1682 LDO regulator is stable with only 2µF on the output.
Small ceramic capacitors can be used, reducing PC board area.
The LTC1682/LTC1682-3.
3/LTC1682-5 are short-circuit and over temperature protected.
The parts are available in 8-pin MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO 4.
2V VCO Power Supply, VIN = 2.
5V to 4.
4V SHUTDOWN 8 4.
7µF 7 6 0.
22µF 4.
7µF 5 C– GND CPO C+ VIN VOUT SHDN LTC1682 FB ...


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