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

LTC3252 - Dual, Low Noise, Inductorless Step-Down DC/DC Converter

Features

  • 2.7V to 5.5V Input Voltage Range
  • No Inductors
  • Typical Efficiency 50% Higher than LDOs
  • Spread Spectrum Operation
  • Low Input and Output Noise
  • Shutdown Disconnects Load from VIN
  • Dual Adjustable Independent Outputs (Range: 0.9V to 1.6V)
  • Output Current: 250mA Each Output
  • Low Operating Current: IIN = 60µA Typ (35µA with One Output Enabled)
  • Low Shutdown Current: IIN = 0.01µA Typ
  • Soft-Start Limits Inrush Current at Turn On
  • Short Circuit and Over Temperature Protected
  • Available in 4mm x 3mm 12-Pin DFN Package

Typical Application

LTC3252 Typical Application
LTC3252 Typical Application

Description

The LTC3252 is a switched capacitor step-down DC/DC converter that produces two adjustable regulated outputs from a single 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve a typical efficiency increase of 50% over that of a linear regulator. No inductors are required.

A unique constant frequency, spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The part also has Burst Mode® operation to provide high efficiency at low output currents, as well as ultralow current shutdown.

Low operating currents (60µA with both outputs enabled, 35µA with one output enabled) and low external parts count make the LTC3252 ideally suited for space-constrained battery-powered applications. The part is shortcircuit and overtemperature protected and is available in a tiny 4mm x 3mm 12-pin DFN 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
LTC3252EDE#PBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes
LTC3252EDE#TRPBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes


LTC3252 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
LTC3252EDE#PBF 4x3 DFN-12 E $3.71 $2.60 Yes
LTC3252EDE#TRPBF 4x3 DFN-12 E $2.70 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
DC611A LTC3252EDE Demo Board | Dual, Spread-Spectrum, Low Noise Inductorless, Step Down Charge Pump, 2.7V ≤ VIN ≤ 5.5V, Vout1 = 1.5V @ 250mA, Vout2 = 1.2V@250mA Contact Factory
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Click here to view our complete list of demo boards

Applications

  • Handheld Electronic Devices
  • Cellular Phones
  • Low Voltage Logic Supplies
  • DSP Power Supplies
  • 3.3V to 1.5V Conversion

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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:
LTC3252

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