LTC3623 - 15V, ±5A Rail-to-Rail Synchronous Buck Regulator
Features
- 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
Typical Application
Description
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 frequencyallowstheuseofsmallersurfacemountinductors 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.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3623EUDD#PBF | 3x5 QFN-24 | UDD | E | 05-08-1833 | Yes |
| LTC3623EUDD#TRPBF | 3x5 QFN-24 | UDD | E | 05-08-1833 | Yes |
| LTC3623IUDD#PBF | 3x5 QFN-24 | UDD | I | 05-08-1833 | Yes |
| LTC3623IUDD#TRPBF | 3x5 QFN-24 | UDD | I | 05-08-1833 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3623EUDD#PBF | 3x5 QFN-24 | E | $5.64 | $3.95 | Yes | |
| LTC3623EUDD#TRPBF | 3x5 QFN-24 | E | $5.70 | $4.01 | Yes | |
| LTC3623IUDD#PBF | 3x5 QFN-24 | I | $6.36 | $4.45 | Yes | |
| LTC3623IUDD#TRPBF | 3x5 QFN-24 | I | $6.42 | $4.51 | Yes | |
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC2131A | LTC3623 Demo Board | Silent Switcher Sync Buck, 4V ≤ VIN ≤ 15V, Vout = 1V/1.5V/2.5V/3.3V/5V @ ±5A | Contact Factory | |
| Buy Now | |||
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
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Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.