Features and Benefits
- Single Resistor Programmable VOUT: 0V to VIN – 0.5V
- Silent Switcher® Architecture
- IISET Accuracy: ±1%
- Tight VOUT Regulation Across VOUT Range
- Output Current Monitor Accuracy: ±5%
- Programmable Wire Drop Compensation
- Easy to Parallel for Higher Current and Heat Spreading
- Input Supply Voltage Regulation Loop
- High Efficiency: Up to 96%
- Output Current: ±5A
- Integrated N-MOSFETs (60mΩ Top & 30mΩ Bottom)
- Adjustable Switching Frequency: 400KHz to 4MHz
- VIN Range: 4V to 15V
- Current Mode Operation for Excellent Line and Load Transient Response
- Shutdown Mode Draws Less Than 1µA Supply Current
- Low Profile 24-Lead 3mm × 5mm QFN Package
TheLTC3623 is a high efficiency, monolithic synchronous buck regulator in which the output voltage is programmed with a single external resistor. The accurate internally generated 50µA current source on the ISET pin allows the user to program an output voltage from 0V to 0.5V below VIN. The user can also directly drive the ISET pin with an external voltage supply to program the converter’s VOUT. The VOUT voltage is fed directly back to the error amplifier to be regulated to the ISET voltage. The operating supply voltage range for the SVIN pin is from 15V down to 4V, while the PVIN pin’s voltage range is 15V down to 1.5V, making it suitable for dual Li-Ion batteries and for taking power from a 12V or 5V rail.
The operating frequency is programmable from 400KHz to 4MHz with an external RT resistor. Higher switching frequency allows the use of smaller surface mount inductors while lower frequency allows for higher power efficiency. The unique constant-frequency/controlled on-time architecture is ideal for high step-down ratio applications that are operating at high frequency while demanding fast transient response.
- Tracking Supply or DDR Memory Supply
- ASIC Substrate Biasing
- Point-of-Load (POL) Power Supply
- Portable Instruments, Battery-Powered Equipment
- Thermo Electric Cooler (TEC) Systems
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 2131A is a current mode DC/DC step-down Silent Switcher® buck regulator featuring the LTC3623. The board operates from an input range of 4V to 15V, and provides ±5A of output current. The output voltage of the demonstration board can be set from 0V to VIN – 0.5V. It operates at 1MHz and may be synchronized to an external clock. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. A power good output and current monitor signal are provided. Discontinuous conduction mode can be selected with a jumper. The demonstration board has options for cable drop compensation, negative output voltage and input voltage regulation.
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.
Models for the following parts are available in LTspice:
Technical Articles (1)
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.