LTC1143 - Dual High Efficiency SO-16 Step-Down Switching Regulator Controllers
Features
- Dual Outputs LTC1143, LTC1143L: 3.3V, 5V LTC1143L-ADJ: Dual Adjustable
- Very High Efficiency: Over 95% Possible
- Current Mode Operation for Excellent Line and Load Transient Response
- High Efficiency Maintained over Three Decades of Output Current
- Low Standby Current at Light Loads: 160µA/Output
- Logic-Controlled Shutdown (LTC1143, LTC1143L)
- Wide VIN Range: 3.5V to 16V (LTC1143L, LTC1143L-ADJ)
- Very Low Dropout Operation: 100% Duty Cycle
- Available in Narrow 16-Pin SO Package
Typical Application
Description
The LTC1143 series is a dual step-down switching regulator controller featuring automatic Burst Mode™ operation to maintain high efficiencies at low output currents. This device is composed of two separate regulator blocks, each driving an external power MOSFET at switching frequencies up to 400kHz using a constant off-time current mode architecture. Both fixed and adjustable voltages are available.The operating current level for both regulators is user-programmable via an external current sense resistor. Wide input supply range allows operation from 4V to 14V (16V maximum). The LTC1143L and LTC1143L-ADJ extend operation to VIN = 3.5V. 100% duty cycle provides low dropout regulation limited only by the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor.
The LTC1143 series is ideal for applications requiring dual output voltages with high conversion efficiencies over a wide load current range in a small amount of board space.
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 |
|---|---|---|---|---|---|
| LTC1143CS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1143CS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1143LCS-ADJ#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1143LCS-ADJ#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1143LCS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1143LCS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1143CS#PBF | SO-16 | C | $5.00 | $3.95 | Yes | |
| LTC1143CS#TRPBF | SO-16 | C | $4.01 | Yes | ||
| LTC1143LCS-ADJ#PBF | SO-16 | C | $4.95 | $4.15 | Yes | |
| LTC1143LCS-ADJ#TRPBF | SO-16 | C | $4.21 | Yes | ||
| LTC1143LCS#PBF | SO-16 | C | $5.35 | $4.15 | Yes | |
| LTC1143LCS#TRPBF | SO-16 | C | $4.21 | 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
- Personal Digital Assistants
- Notebook and Palmtop Computers
- Battery-Operated Digital Devices
- Portable Instruments
- DC Power Distribution 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:
LTC1143
LTC1143L
LTC1143L-ADJ
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.
