LTC1682 Series

Doubler Charge Pumps with Low Noise Linear Regulator

Catalog

Doubler Charge Pumps with Low Noise Linear Regulator

Part	Voltage - Output (Min/Fixed)	Voltage - Output (Max) [Max]	Supplier Device Package	Number of Outputs	Operating Temperature [Max]	Operating Temperature [Min]	Current - Output	Output Configuration	Mounting Type	Package / Case	Package / Case [custom]	Package / Case	Voltage - Input (Max) [Max]	Output Type	Voltage - Input (Min) [Min]	Function	Frequency - Switching	Output Type	Package / Case [y]	Package / Case [x]
Analog Devices LTC1682IMS8#PBF	2.5 V	5.5 V	8-MSOP	1	85 °C	-40 °C	50 mA	Positive	Surface Mount	8-MSOP 8-TSSOP	0.118 in	3 mm	4.4 V	Adjustable	1.8 V	Step-Up/Step-Down	550 kHz
Analog Devices LTC1682IS8-5#PBF	5 V		8-SO	1	85 °C	-40 °C	50 mA	Positive	Surface Mount	8-SOIC			4.4 V		1.8 V	Step-Up	550 kHz	1.81 mOhm	3.9 mm	0.154 in
Analog Devices LTC1682IS8-3.3#TRPBF	3.3 V		8-SO	1	85 °C	-40 °C	50 mA	Positive	Surface Mount	8-SOIC			4.4 V		1.8 V	Step-Up/Step-Down	550 kHz	1.81 mOhm	3.9 mm	0.154 in
Analog Devices LTC1682IS8-3.3#PBF	3.3 V		8-SO	1	85 °C	-40 °C	50 mA	Positive	Surface Mount	8-SOIC			4.4 V		1.8 V	Step-Up/Step-Down	550 kHz	1.81 mOhm	3.9 mm	0.154 in
Analog Devices LTC1682CMS8-3.3#TRPBF	3.3 V		8-MSOP	1	70 °C	0 °C	50 mA	Positive	Surface Mount	8-MSOP 8-TSSOP	0.118 in	3 mm	4.4 V		1.8 V	Step-Up/Step-Down	550 kHz	1.81 mOhm
Analog Devices LTC1682CMS8-3.3#PBF	3.3 V		8-MSOP	1	70 °C	0 °C	50 mA	Positive	Surface Mount	8-MSOP 8-TSSOP	0.118 in	3 mm	4.4 V		1.8 V	Step-Up/Step-Down	550 kHz	1.81 mOhm
Analog Devices LTC1682CMS8#TRPBF	2.5 V	5.5 V	8-MSOP	1	70 °C	0 °C	50 mA	Positive	Surface Mount	8-MSOP 8-TSSOP	0.118 in	3 mm	4.4 V	Adjustable	1.8 V	Step-Up/Step-Down	550 kHz
Analog Devices LTC1682IS8#TRPBF	2.5 V	5.5 V	8-SO	1	85 °C	-40 °C	50 mA	Positive	Surface Mount	8-SOIC			4.4 V	Adjustable	1.8 V	Step-Up/Step-Down	550 kHz		3.9 mm	0.154 in
Analog Devices LTC1682CS8-5#PBF	5 V		8-SO	1	70 °C	0 °C	50 mA	Positive	Surface Mount	8-SOIC			4.4 V		1.8 V	Step-Up	550 kHz	1.81 mOhm	3.9 mm	0.154 in

Catalog

Doubler Charge Pumps with Low Noise Linear Regulator

Key Features

• 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

Description

The LTC1682/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 VOUTvia 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 VINby disabling the regulator and discharges VOUTto 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.ApplicationsVCO Power Supplies in Cellular Phones2-Way PagersWireless PCMCIA CardsPortable Medical InstrumentsLow Power Data AcquisitionRemote Transmitters