LTC3605 - 15V, 5A Synchronous Step-Down Regulator
Features
- High Efficiency: Up to 96%
- 5A Output Current
- 4V to 15V VIN Range
- Integrated Power N-Channel MOSFETs
(70mΩ Top and 35mΩ Bottom) - Adjustable Frequency 800kHz to 4MHz
- PolyPhase® Operation (Up to 12 Phases)
- Output Tracking
- 0.6V ±1% Reference Accuracy
- Current Mode Operation for Excellent Line and Load Transient Response
- Shutdown Mode Draws Less Than 15μA Supply Current
- Available in 24-Pin (4mm × 4mm) QFN Package
Typical Application
Description
The LTC3605 is a high efficiency, monolithic synchronous buck regulator using a phase lockable controlled on-time constant frequency, current mode architecture. PolyPhase operation allows multiple LTC3605 regulators to run out of phase while using minimal input and output capacitance. The operating supply voltage range is from 15V down to 4V, making it suitable for dual lithium-ion battery inputs as well as point of load power supply applications from a 12V or 5V rail.
The operating frequency is programmable from 800kHz to 4MHz with an external resistor. The high frequency capability allows the use of small surface mount inductors. For switching noise sensitive applications, it can be externally synchronized from 800kHz to 4MHz. The PHMODE pin allows user control of the phase of the outgoing clock signal. 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. Two internal phase-lock loops synchronize the internal oscillator to the external clock and also servos the regulator on-time to lock on to either the internal clock or the external clock if it’s present.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-24
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC3605AEUF#PBF | QFN | 24 | E | $6.07 | $4.25 | View |
| LTC3605AEUF#TRPBF | QFN | 24 | E | $4.31 | View | |
| LTC3605AIUF#PBF | QFN | 24 | I | $7.14 | $5.00 | View |
| LTC3605AIUF#TRPBF | QFN | 24 | I | $5.06 | View | |
| LTC3605EUF#PBF | QFN | 24 | E | $6.07 | $4.25 | View |
| LTC3605EUF#TRPBF | QFN | 24 | E | $4.31 | View | |
| LTC3605IUF#PBF | QFN | 24 | I | $7.14 | $5.00 | View |
| LTC3605IUF#TRPBF | QFN | 24 | I | $5.06 | View | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request 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 |
|---|---|---|---|
| DC1215A | LTC3605EUF Demo Board | 14V, 5A PolyPhase Synchronous Step Down Regulator | $150.00 | |
| Buy Now | |||
Applications
- Point of Load Power Supply
- Portable Instruments
- Distributed Power Systems
- Battery-Powered Equipment
Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV does not automatically open after clicking the link above, 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
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Related models available in LTspice IV
LTC3605
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.
