LTC3406-1.2 - 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
Features
- High Efficiency: Up to 90%
- Very Low Quiescent Current: Only 20µA
- 600mA Output Current at VIN = 3V
- 2.5V to 5.5V Input Voltage Range
- 1.5MHz Constant Frequency Operation
- No Schottky Diode Required
- Shutdown Mode Draws < 1µA Supply Current
- Current Mode Operation for Excellent Line and Load Transient Response
- Overtemperature Protected
- Low Profile (1mm) ThinSOTTM Package
Typical Application
Description
The LTC3406-1.2 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation with only 20µA drops <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406-1.2 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic Burst Modeoperation further increases efficiency at light loads..
Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The LTC3406-1.2 is available in a low profile (1mm) ThinSOT package.
Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.
| Vout | Fsw | Features | |
| LTC3406 | Adj. | 1.5MHz | Burst Mode |
| LTC3406-1.2 | 1.2V | 1.5MHz | Burst Mode |
| LTC3406-1.5 | 1.5V | 1.5MHz | Burst Mode |
| LTC3406-1.8 | 1.8V | 1.5MHz | Burst Mode |
| LTC3406B | Adj. | 1.5MHz | Burst Mode Disabled |
| LTC3406B-1.2 | 1.2V | 1.5MHz | Burst Mode Disabled |
| LTC3406B-2 | Adj. | 2.25MHz | Burst Mode Disabled |
| LTC3406A | Adj. | 1.5MHz | Low Ripple Burst Mode |
| LTC3406AB | Adj. | 1.5MHz | Burst Mode Disabled |
| LTC3406AB-2 | Adj. | 2.25MHz | Burst Mode Disabled |
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3406ES5-1.2#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC3406ES5-1.2#TRPBF | SOT-23 | S5 | E | 05-08-1635 | 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 | |
|---|---|---|---|---|---|---|
| LTC3406ES5-1.2#TRMPBF | SOT-23 | E | $2.86 | $2.03 | Yes | |
| LTC3406ES5-1.2#TRPBF | SOT-23 | E | $2.86 | $2.01 | 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.Click here to view our complete list of demo boards
Applications
- Cellular Telephones
- Personal Information Appliances
- Wireless and DSL Modems
- Digital Still Cameras
- MP3 Players
- Portable Instruments
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Product Notifications
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC3406
LTC3406-1.2
LTC3406-1.5
LTC3406-1.8
LTC3406A
LTC3406AB
LTC3406B
LTC3406B-1.2
LTC3406B-1.5
LTC3406B-1.8
LTC3406B-2
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
LT3406B
LTC3406
LTC3406-1.2
LTC3406-1.5
LTC3406-1.8
LTC3406A
LTC3406AB
LTC3406AB-2
LTC3406B
LTC3406B-1.2
LTC3406B-2
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.
