LTC1872B - Constant Frequency Current Mode Step-Up DC/DC Controller in ThinSOT
Features
- Burst Mode™ Operation Disabled for Lower Output Ripple at Light Loads
- High Efficiency: Over 90%
- High Output Currents Easily Achieved
- Wide VIN Range: 2.5V to 9.8V
- VOUT Limited Only by External Components
- Constant Frequency 550kHz Operation
- Current Mode Operation for Excellent Line and Load Transient Response
- Shutdown Mode Draws Only 8µA Supply Current
- Low Profile (1mm) ThinSOT™ Package
Typical Application
Description
The LTC1872B is a constant frequency current mode step-up DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1872B when the input voltage falls below 2.0V.
The LTC1872B provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. In shutdown, the device draws a mere 8µA.
High constant operating frequency of 550kHz allows the use of a small external inductor. The constant frequency operation is maintained down to very light loads, resulting in less low frequency noise generation over a wide load current range.
The LTC1872B is available in a 6-lead low profile (1mm) ThinSOT package. For a Burst Mode operation enabled version of the LTC1872B, please refer to the LTC1872 data sheet.
| Burst Mode | |
| LTC1872 | Yes |
| LTC1872B | No |
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 |
|---|---|---|---|---|---|
| LTC1872BES6#PBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1872BES6#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1872BES6#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 | |
|---|---|---|---|---|---|---|
| LTC1872BES6#PBF | SOT-23 | E | $2.21 | Yes | ||
| LTC1872BES6#TRMPBF | SOT-23 | E | $2.21 | $1.87 | Yes | |
| LTC1872BES6#TRPBF | SOT-23 | E | $2.21 | $1.85 | 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
- Optical Communications
- Lithium-Ion-Powered Applications
- Cellular Telephones
- Wireless Devices
- Portable Computers
- Scanners
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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:
LTC1872
LTC1872B
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.
