LTC1682 - Doubler Charge Pumps with Low Noise Linear Regulator

Features

  • Click Here For LTC1682 Evaluation Kits
  • 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

Typical Application

LTC1682
LTC1682
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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 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 100Ohms 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.
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Packaging

MS-8, SO-8

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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC1682CMS8 MSOP 8 C $2.30 $1.90 View
LTC1682CMS8#PBF MSOP 8 C $2.30 $1.90 View
LTC1682CMS8#TR MSOP 8 C   $1.96 View
LTC1682CMS8#TRPBF MSOP 8 C   $1.96 View
LTC1682CMS8-3.3 MSOP 8 C $2.30 $1.90 View
LTC1682CMS8-3.3#PBF MSOP 8 C $2.30 $1.90 View
LTC1682CMS8-3.3#TR MSOP 8 C   $1.96 View
LTC1682CMS8-3.3#TRPBF MSOP 8 C   $1.96 View
LTC1682CMS8-5 MSOP 8 C $2.30 $1.90 View
LTC1682CMS8-5#PBF MSOP 8 C $2.30 $1.90 View
LTC1682CMS8-5#TR MSOP 8 C   $1.96 View
LTC1682CMS8-5#TRPBF MSOP 8 C   $1.96 View
LTC1682CS8 SO 8 C $2.00 $1.70 View
LTC1682CS8#PBF SO 8 C $2.00 $1.70 View
LTC1682CS8#TR SO 8 C   $1.76 View
LTC1682CS8#TRPBF SO 8 C   $1.76 View
LTC1682CS8-3.3 SO 8 C $2.00 $1.70 View
LTC1682CS8-3.3#PBF SO 8 C $2.00 $1.70 View
LTC1682CS8-3.3#TR SO 8 C   $1.76 View
LTC1682CS8-3.3#TRPBF SO 8 C   $1.76 View
LTC1682CS8-5 SO 8 C $2.00 $1.70 View
LTC1682CS8-5#PBF SO 8 C $2.00 $1.70 View
LTC1682CS8-5#TR SO 8 C   $1.76 View
LTC1682CS8-5#TRPBF SO 8 C   $1.76 View
LTC1682IMS8 MSOP 8 I $2.65 $2.25 View
LTC1682IMS8#PBF MSOP 8 I $2.65 $2.25 View
LTC1682IMS8#TR MSOP 8 I   $2.31 View
LTC1682IMS8#TRPBF MSOP 8 I   $2.31 View
LTC1682IMS8-3.3 MSOP 8 I $2.65 $2.25 View
LTC1682IMS8-3.3#PBF MSOP 8 I $2.65 $2.25 View
LTC1682IMS8-3.3#TR MSOP 8 I   $2.31 View
LTC1682IMS8-3.3#TRPBF MSOP 8 I   $2.31 View
LTC1682IMS8-5 MSOP 8 I $2.65 $2.25 View
LTC1682IMS8-5#PBF MSOP 8 I $2.65 $2.25 View
LTC1682IMS8-5#TR MSOP 8 I   $2.31 View
LTC1682IMS8-5#TRPBF MSOP 8 I   $2.31 View
LTC1682IS8 SO 8 I $2.35 $2.00 View
LTC1682IS8#PBF SO 8 I $2.35 $2.00 View
LTC1682IS8#TR SO 8 I   $2.06 View
LTC1682IS8#TRPBF SO 8 I   $2.06 View
LTC1682IS8-3.3 SO 8 I $2.35 $2.00 View
LTC1682IS8-3.3#PBF SO 8 I $2.35 $2.00 View
LTC1682IS8-3.3#TR SO 8 I   $2.06 View
LTC1682IS8-3.3#TRPBF SO 8 I   $2.06 View
LTC1682IS8-5 SO 8 I $2.35 $2.00 View
LTC1682IS8-5#PBF SO 8 I $2.35 $2.00 View
LTC1682IS8-5#TR SO 8 I   $2.06 View
LTC1682IS8-5#TRPBF SO 8 I   $2.06 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number Description Price
DC249A-A LTC1682CMS8 | Doubler Charge Pump with Linear Regulator, Adjustable, 1.8 to 4.4Vin, 2.5 to 5.5Vout @ 50mA  
DC249A-B LTC1682CMS8-5 | Doubler Charge Pump with Linear Regulator, Fixed, 2.7 to 4.4Vin, 5.0Vout @ 50mA  
DC249A-C LTC1682CMS8-3.3 | Doubler Charge Pump with Linear Regulator, Fixed, 2.0 to 4.4Vin, 3.3Vout @ 50mA  
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Applications

  • VCO Power Supplies in Cellular Phones
  • 2-Way Pagers
  • Wireless PCMCIA Cards
  • Portable Medical Instruments
  • Low Power Data Acquisition
  • Remote Transmitters
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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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