LTC1624 - High Efficiency SO-8 N-Channel Switching Regulator Controller

Features

  • N-Channel MOSFET Drive
  • Implements Boost, Step-Down, SEPIC and Inverting Regulators
  • Wide VIN Range: 3.5V to 36V Operation
  • Wide VOUT Range: 1.19V to 30V in Step-Down Configuration
  • ±1% 1.19V Reference
  • Low Dropout Operation: 95% Duty Cycle
  • 200kHz Fixed Frequency
  • Low Standby Current
  • Very High Efficiency
  • Remote Output Voltage Sense
  • Logic-Controlled Micropower Shutdown
  • Internal Diode for Bootstrapped Gate Drive
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Available in an 8-Lead SO Package

Typical Application

LTC1624 Typical Application

Description

The LTC1624 is a current mode switching regulator controller that drives an external N-channel power MOSFET using a fixed frequency architecture. It can be operated in all standard switching configurations including boost, step-down, inverting and SEPIC. Burst Mode operation provides high efficiency at low load currents. A maximum high duty cycle limit of 95% provides low dropout operation which extends operating time in battery-operated systems.

The operating frequency is internally set to 200kHz, allowing small inductor values and minimizing PC board space. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 36V (absolute maximum).

A multifunction pin (ITH/RUN) allows external compensation for optimum load step response plus shutdown. Soft start can also be implemented with the ITH/RUN pin to properly sequence supplies.

Packaging

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

SO-8

LTC1624 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC1624CS8 SO 8 C $4.30 $3.50 View
LTC1624CS8#PBF SO 8 C $4.30 $3.50 View
LTC1624CS8#TR SO 8 C $3.56 View
LTC1624CS8#TRPBF SO 8 C $3.56 View
LTC1624IS8 SO 8 I $5.50 $4.45 View
LTC1624IS8#PBF SO 8 I $5.50 $4.45 View
LTC1624IS8#TR SO 8 I $4.51 View
LTC1624IS8#TRPBF SO 8 I $4.51 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.

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
DC164A LTC1624CS8 | STEP DOWN CONVERTER, 4.5V to 28V INPUT, 2.5V or 3.3V or 5.0V @ 3A OUTPUT $100.00
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Click here to view our complete list of demo boards

Applications

  • Notebook and Palmtop Computers, PDAs
  • Cellular Telephones and Wireless Modems
  • Battery-Operated Digital Devices
  • DC Power Distribution Systems
  • Battery Chargers

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Design Tools

LTspiceIV

LTspice IV 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 IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LTC1624

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