LTC3409A - 600mA Low VIN Buck Regulator in 3mm × 3mm DFN
Features
- 1.6V to 5.5V Input Voltage Range
- 0.62V to 5.5V Output Voltage Range
- Internal Soft-Start
- Selectable 1.7MHz or 2.6MHz Constant Frequency Operation
- Internal Oscillator Can Be Synchronized to an External Clock, 1MHz to 3MHz Range
- High Efficiency: Up to 95%
- 65μA Quiescent Current, Burst Mode® Operation
- 600mA Output Current (VIN = 1.8V, VOUT = 1.2V)
- 750mA Peak Inductor Current
- No Schottky Diode Required
- Low Dropout Operation: 100% Duty Cycle
- 0.612V Reference Voltage
- Stable with Ceramic Capacitors
- Shutdown Mode Draws <1μA Supply Current
- Current Mode Operation for Excellent Line and Load Transient Response
- Overtemperature Protection
- Available in a Low Profile (0.75mm)
- 8-Lead (3mm × 3mm) DFN Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC3409A is a high efficiency, monolithic synchronous buck regulator using a constant frequency, current mode architecture. The LTC3409A improves upon the LTC3409’s light load regulation in Burst Mode operation. The output voltage is adjusted via an external resistor divider.
Fixed switching frequencies of 1.7MHz and 2.6MHz are supported. Alternatively, an internal PLL will synchronize to an external clock in the frequency range of 1MHz to 3MHz. This range of switching frequencies allows the use of small surface mount inductors and capacitors, including ceramics.
Supply current during Burst Mode operation is only 65μA dropping to <1μA in shutdown. The 1.6V to 5.5V input voltage range makes the LTC3409A ideally suited for single cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Burst Mode operation can be user-enabled, increasing efficiency at light loads, further extending battery life.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Internal soft-start offers controlled output voltage rise time at startup without the need for external components.
| Vref Tolerance | |
| LTC3409 | +/-5% |
| LTC3409A | +/-3% |
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 |
|---|---|---|---|---|---|
| LTC3409AEDD#PBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3409AEDD#TRPBF | 3x3 DFN-8 | DD | E | 05-08-1698 | Yes |
| LTC3409AIDD#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC3409AIDD#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | 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 | |
|---|---|---|---|---|---|---|
| LTC3409AEDD#PBF | 3x3 DFN-8 | E | $3.39 | $2.37 | Yes | |
| LTC3409AEDD#TRPBF | 3x3 DFN-8 | E | $2.43 | Yes | ||
| LTC3409AIDD#PBF | 3x3 DFN-8 | I | $4.06 | $2.84 | Yes | |
| LTC3409AIDD#TRPBF | 3x3 DFN-8 | I | $2.90 | 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
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3409AIDD#PBF | 3x3 DFN-8 | I | $4.06 | $2.84 | Yes | |
| LTC3409AIDD#TRPBF | 3x3 DFN-8 | I | $2.90 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Cellular Phones
- Digital Cameras
- MP3 Players
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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:
LTC3409
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:
LTC3409
LTC3409A
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.
