Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

Obsolete

LTC1626 - Low Voltage, High Efficiency Step-Down DC/DC Converter

Features

  • OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.
  • Wide Input Supply Voltage Range: 2.5V to 6V
  • High Efficiency: Up to 95%
  • Low RDS(ON) Internal Switch: 0.32ohms (VIN = 4.5V)
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Short-Circuit Protected
  • Low Dropout Operation: 100% Duty Cycle
  • Built-In Low-Battery Detector
  • Low Quiescent Current at Light Loads: IQ = 165µA
  • Ultralow Shutdown Current: IQ = 0.5µA
  • Peak Inductor Current Independent of Inductor Value
  • Available in 14-Pin SO Package

Typical Application

LTC1626 Typical Application
LTC1626 Typical Application

Description

OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.

The LTC1626 is a monolithic, low voltage, step-down current mode DC/DC converter featuring Burst Mode™ operation at low output current.

The input supply voltage range of 2.5V to 6V makes the LTC1626 ideal for single cell Li-Ion and 3- or 4-cell NiCd/NiMH applications. A built-in 0.32ohms switch (VIN = 4.5V) allows up to 0.6A of output current.

The LTC1626 incorporates automatic power saving Burst Mode operation to reduce gate charge losses when the load current drops below the level required for continuous operation. With no load, the converter draws only 165µA. In shutdown, it draws a mere 0.5µA—making it ideal for current sensitive applications.

The inductor current is user-programmable via an external current sense resistor. In dropout, the internal P-channel MOSFET switch is turned on continuously, maximizing battery life.

Packaging

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

LTC1626 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

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.

Click here to view our complete list of demo boards

Applications

  • Single Cell Li-Ion Step-Down Converters
  • 3- or 4-Cell NiMH Step-Down Converters
  • Cellular Telephones
  • 5V to 3.3V Conversion
  • 3.3V to 2.5V Conversion
  • Inverting Converters
  • Portable Instruments

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Design Tools

LTspice

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Models for the following parts are available in LTspice:
LTC1626

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