LTC3406
LAST TIME BUY1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
- Part Models
- 2
- 1ku List Price
- Starting From $3.63
Overview
- High Efficiency: Up to 96%
- Very Low Quiescent Current: Only 20µA During Operation
- 600mA Output Current
- 2.5V to 5.5V Input Voltage Range
- 1.5MHz Constant Frequency Operation
- No Schottky Diode Required
- Low Dropout Operation: 100% Duty Cycle
- 0.6V Reference Allows Low Output Voltages
- Shutdown Mode Draws </=1µA Supply Current
- Current Mode Operation for Excellent Line and Load Transient Response
- Overtemperature Protected
- Low Profile (1mm) ThinSOT™ Package
The LTC3406 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.5V and 1.8V. Supply current during operation is only 20µA and drops to <=1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic Burst Mode® operation increases efficiency at light loads, further extending battery life.
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. Low output voltages are easily supported with the 0.6V feedback reference voltage. The LTC3406 is available in a low profile (1mm) ThinSOT package.
Protected by U.S. Patents, including 6580258, 5481178.
| 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 |
Applications
- Cellular Telephones
- Personal Information Appliances
- Wireless and DSL Modems
- Digital Still Cameras
- MP3 Players
- Portable Instruments
Documentation
Data Sheet 1
User Guide 1
Design Note 3
Technical Articles 1
LT Journal 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 |
|---|---|---|---|
| LTC3406ES5#TRMPBF | 5-Lead TSOT-23 | ||
| LTC3406ES5#TRPBF | 5-Lead TSOT-23 |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jul 29, 2026 - 26_0046 Discontinuation of Parts Manufactured in TSMC Fab 2 and 5 in Hsinchu, Taiwan. |
||
| LTC3406ES5#TRMPBF | ||
| LTC3406ES5#TRPBF | ||
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3406A | PRODUCTION | 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
Tools & Simulations
LTspice 1
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 2
Design tools for the following parts are available in LTpowerCAD:
- LTC3406
- LTC3406-1.2
- LTC3406-1.5
- LTC3406-1.8
- LTC3406B
- LTC3406B-2
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.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
LTC3406ES5 Demo Board | 2.7V to 5.5VIN, 1.2VOUT @ 600mA(Max)
Resources
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