LTC3250 - High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

Features

  • 2.7V to 5.5V Input Voltage Range
  • No Inductors
  • Li-Ion (3.6V) to 1.5V with 81% Efficiency
  • Low Noise Constant Frequency Operation
  • Output Voltages: 1.5V ±4%, 1.2V ±4%
  • Output Current: 250mA
  • Shutdown Disconnects Load from VIN
  • Low Operating Current: IQ = 35µA
  • Low Shutdown Current: ISD <1µA
  • Oscillator Frequency = 1.5MHz
  • Soft-Start Limits Inrush Current at Turn-On
  • Short-Circuit and Overtemperature Protected
  • Low Profile (1mm) ThinSOT Package

Typical Application

LTC3250 Typical Application
LTC3250 Typical Application

Description

The LTC3250-1.5/LTC3250-1.2 are charge pump step-down DC/DC converters that produce a 1.5V or 1.2V regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve typical efficiency two times higher than that of a linear regulator. No inductors are required.

A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators.* High frequency operation (fOSC = 1.5MHz) simplifies filtering to further reduce conducted noise. The part also uses Burst Mode® operation to improve efficiency at light loads.

Low operating current (35µA with no load, <1µA in shutdown) and low external parts count (three small ceramic capacitors) make the LTC3250-1.5/LTC3250-1.2 ideally suited for space constrained battery powered applications. The parts are short-circuit and over-temperature protected, and are available in a low profile (1mm) 6-pin ThinSOT package.

*U.S. Patent #6, 411, 531

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
LTC3250ES6-1.2#PBF SOT-23 S6 E 05-08-1636 Yes
LTC3250ES6-1.2#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LTC3250ES6-1.2#TRPBF SOT-23 S6 E 05-08-1636 Yes
LTC3250ES6-1.5#PBF SOT-23 S6 E 05-08-1636 Yes
LTC3250ES6-1.5#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LTC3250ES6-1.5#TRPBF SOT-23 S6 E 05-08-1636 Yes


LTC3250 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
LTC3250ES6-1.2#PBF SOT-23 E $2.12 Yes
LTC3250ES6-1.2#TRMPBF SOT-23 E $2.12 $1.43 Yes
LTC3250ES6-1.2#TRPBF SOT-23 E $2.12 $1.41 Yes
LTC3250ES6-1.5#PBF SOT-23 E $2.12 Yes
LTC3250ES6-1.5#TRMPBF SOT-23 E $2.12 $1.43 Yes
LTC3250ES6-1.5#TRPBF SOT-23 E $2.12 $1.41 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
DC488A LTC3250ES6-1.5 Demo Board | Low Noise Regulated Step-Down Charge Pump, 3.1V ≤ VIN ≤ 5.5V, Vout = 1.5V @ 250mA $75.00
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Click here to view our complete list of demo boards

Applications

  • Handheld Computers
  • Cellular Phones
  • Digital Cameras
  • Handheld Medical Instruments
  • Low Power DSP Supplies

Product Notifications

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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:
LTC3250-1.2
LTC3250-1.5

Technical Support