Power Management Inductorless (Charge Pump) DC/DC Converters Regulated Step-Up Charge Pumps

LTC1928-5 - Doubler Charge Pump with Low Noise Linear Regulator in SOT-23

Features

  • Low Output Noise: 90µVRMS (100kHz BW)
  • Low Profile (1mm) ThinSOT™ Package
  • Fixed Output Voltage: 5V
  • Input Voltage Range: 2.7V to 4.4V
  • Uses Small Ceramic Capacitors
  • No Inductors Required
  • Output Current Up to 30mA
  • 550kHz Switching Frequency
  • Low Operating Current: 190µA
  • Low Shutdown Current: 4µA
  • Internal Thermal Shutdown and Current Limiting

Typical Application

LTC1928-5 Typical Application
LTC1928-5 Typical Application

Description

The LTC1928-5 is a doubler charge pump with an internal low noise, low dropout (LDO) linear regulator. The 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 charge pump converts a 2.7V to 4.4V input to a boosted output, while the internal LDO regulator converts the boosted voltage to a low noise regulated output. The regulator is capable of supplying up to 30mA of output current. Shutdown reduces the supply current to <8µA, removes the load from VIN by disabling the regulator and discharges VOUT to ground through a 200 Ohms switch.

The LTC1928-5 LDO regulator is stable with only 2µF on the output. Small ceramic capacitors can be used, reducing PC board area.

The LTC1928-5 is short-circuit and overtemperature protected. The part is available in a 6-pin low profile (1mm) ThinSOT package.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC1928ES6-5#PBF SOT-23 S6 E 05-08-1636 Yes
LTC1928ES6-5#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LTC1928ES6-5#TRPBF SOT-23 S6 E 05-08-1636 Yes


LTC1928-5 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC1928ES6-5#PBF SOT-23 E $2.06 Yes
LTC1928ES6-5#TRMPBF SOT-23 E $2.06 $1.78 Yes
LTC1928ES6-5#TRPBF SOT-23 E $2.06 $1.76 Yes
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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.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC353A LTC1928ES6-5 | Low Noise Boost DC/DC Converter, 2.7V to 4.4V Input, 5Vout @ 30mA $75.00
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Click here to view our complete list of demo boards

Applications

  • VCO Power Supplies for Cellular Phones
  • 2-Way Pagers
  • Wireless PCMCIA Cards
  • Portable Medical Instruments
  • Low Power Data Acquisition
  • Remote Transmitters
  • White LED Driver
  • GaAs Switches

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC1928-5

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