LTC3623

RECOMMENDED FOR NEW DESIGNS

15V, ±5A Rail-to-Rail Synchronous Buck Regulator

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Overview

  • 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.

Applications

  • 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
LTC3623
15V, ±5A Rail-to-Rail Synchronous Buck Regulator
LTC3623 Typical Application Image 1 LTC3623 Typical Application Image 2 LTC3623 Package Image 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LTC3600
RECOMMENDED FOR NEW DESIGNS 15V, 1.5A Synchronous Rail-to-Rail Single Resistor Step-Down Regulator
LTC3649
RECOMMENDED FOR NEW DESIGNS 60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3623
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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.

Evaluation Kits

eval board
schematic 1
DC2131A

LTC3623 Demo Board | Silent Switcher Sync Buck, 4V ≤ VIN ≤ 15V, VOUT = 1V/1.5V/2.5V/3.3V/5V @ ±5A

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Product Details

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.
DC2131A
LTC3623 Demo Board | Silent Switcher Sync Buck, 4V ≤ VIN ≤ 15V, VOUT = 1V/1.5V/2.5V/3.3V/5V @ ±5A
DC2131A - Schematic

Latest Discussions

1 Years Ago
Power Manager recommendation for use of sink current on LT3623
1 Years Ago
LTC3623 IMON can limit current. But negative current cannot be limited?
2 Years Ago
Schematic feed back on LTC3623
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