LTC3801 - Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT
Features
- High Efficiency: Up to 94%
- Very Low No-Load Quiescent Current: Only 16µA (LTC3801)
- High Output Currents Easily Achieved
- Internal Soft-Start
- Wide VIN Range: 2.4V to 9.8V
- Low Dropout: 100% Duty Cycle
- Constant Frequency 550kHz Operation
- Burst Mode® Operation for High Efficiency at Light Loads (LTC3801)
- Burst Mode Operation Disabled for Lower Output Ripple at Light Loads (LTC3801B)
- Output Voltage as Low as 0.8V
- ±1.5% Voltage Reference Accuracy
- Current Mode Operation for Excellent Line and Load Transient Response
- Only 6µA Supply Current in Shutdown (LTC3801)
- Low Profile (1mm) SOT-23 Package
Typical Application
Description
The LTC3801/LTC3801B are constant frequency current mode step-down DC/DC controllers in a low profile (1mm max) 6-lead SOT-23 (ThinSOT) package. The parts provide excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. The LTC3801 consumes only 195mA of quiescent current in normal operation, dropping to 16µA under no-load conditions.
The LTC3801/LTC3801B incorporate an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.2V. The LTC3801 automatically switches into Burst Mode operation at light loads which enhances efficiency at low output current. In the LTC3801B, Burst Mode operation is disabled for lower output ripple at light loads.
To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor.
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 |
|---|---|---|---|---|---|
| LTC3801BES6#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC3801BES6#TRPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC3801ES6#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC3801ES6#TRPBF | SOT-23 | S6 | E | 05-08-1636 | 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 | |
|---|---|---|---|---|---|---|
| LTC3801BES6#TRMPBF | SOT-23 | E | $3.02 | $2.03 | Yes | |
| LTC3801BES6#TRPBF | SOT-23 | E | $3.02 | $2.01 | Yes | |
| LTC3801ES6#TRMPBF | SOT-23 | E | $3.02 | $2.03 | Yes | |
| LTC3801ES6#TRPBF | SOT-23 | E | $3.02 | $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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC623A | LTC3801ES6 | 550kHz Micropower Step-Down DC/DC Controller, Vin = 2.5V-9.8V, Vout = 2.5V @ 1A | $75.00 | |
| Buy Now | |||
Applications
- 1- or 2-Cell Li-Ion Battery-Powered Applications
- Wireless Devices
- Portable Computers
- Distributed Power Systems
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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:
LTC3801
LTC3801B
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.
