LTC3623
RECOMMENDED FOR NEW DESIGNS15V, ±5A Rail-to-Rail Synchronous Buck Regulator
- Part Models
- 4
- 1ku List Price
- Starting From $5.98
Overview
- Resistor Programmable Voltage:
- Output Voltage: 0V to VIN – 0.5V
- VOUT Pin: 0 to ISET
- 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
The LTC3623 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 through an external RISET resistor or directly drive the ISET pin with an external voltage supply up to 9V to program the converter's VOUT pin. The VOUT pin voltage is fed directly back to the error amplifier to be regulated to the ISET voltage. For output voltages above 9V, connect a resistor divider between VOUT and the VOUT pin, as shown in Figure 15. 15V to 12V 1MHz Buck Converter with Output Resistor Dividers. 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
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 1
Brochure 1
Book & eBook 1
Webcast 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. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3623EUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3623EUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3623IUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3623IUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3623
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
LTC3623 Demo Board | Silent Switcher Sync Buck, 4V ≤ VIN ≤ 15V, VOUT = 1V/1.5V/2.5V/3.3V/5V @ ±5A