Features and Benefits
- 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
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.
- Notebook and Palmtop Computers, PDAs
- Cellular Telephones and Wireless Modems
- Battery-Operated Digital Devices
- DC Power Distribution Systems
- Battery Chargers
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration Circuit 164 is a constant-frequency step-down (buck) regulator using the LTC1624 switching regulator controller. DC164 is ideal for a wide range of portable, industrial, computer and communications applications. It provides up to 3A of output current at a user-selectable (via a jumper) output voltage of 2.5V, 3.3V or 5V. The input voltage can range from 4.8V to 28V (limited by the external MOSFET).
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, 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.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.