LTC1553 - 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium® II Processor
Features
- 5-Bit Digitally Programmable 1.8V to 3.5V Fixed Output Voltage
- Provides All Features Required by the Intel Pentium® II Processor VRM 8.2 DC/DC Converter Specification
- Flags for Power Good, Over-Temperature and Overvoltage Fault
- 19A Output Current Capability from a 5V or 12V Supply
- Dual N-Channel MOSFET Synchronous Driver
- Initial Output Accuracy: ±1.5%
- Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations
- High Efficiency: Over 95% Possible
- Adjustable Current Limit Without External Sense Resistors
- Fast Transient Response
- Available in 20-Lead SSOP and SW Packages
Typical Application
Description
The LTC1553 is a high power, high efficiency switching regulator controller optimized for 5V or 12V input to 1.8V- 3.5V output applications. It features a digitally programmable output voltage, a precision internal reference and an internal feedback system that provides output accuracy of +/-1.5% at room temperature and typically +/-2% over-temperature, load current and line voltage shifts. The LTC1553 uses a synchronous switching architecture with two external N-channel output devices, providing high efficiency and eliminating the need for a high power, high cost P-channel device. Additionally, it senses the output current across the on-resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor.The LTC1553 free-runs at 300kHz and can be synchronized to a faster external clock if desired. It includes all the inputs and outputs required to implement a power supply conforming to the Intel Pentium II Processor VRM 8.2 DC/DC Converter Specification.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 |
|---|---|---|---|---|---|
| LTC1553CG#PBF | SSOP-20 | G | C | 05-08-1640 (G20) | Yes |
| LTC1553CG#TRPBF | SSOP-20 | G | C | 05-08-1640 (G20) | Yes |
| LTC1553CSW#PBF | SW-20 | SW | C | 05-08-1620 (SW20) | Yes |
| LTC1553CSW#TRPBF | SW-20 | SW | C | 05-08-1620 (SW20) | 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 | |
|---|---|---|---|---|---|---|
| LTC1553CG#PBF | SSOP-20 | C | $4.45 | $3.75 | Yes | |
| LTC1553CG#TRPBF | SSOP-20 | C | $3.85 | Yes | ||
| LTC1553CSW#PBF | SW-20 | C | $4.20 | $3.50 | Yes | |
| LTC1553CSW#TRPBF | SW-20 | C | $3.60 | 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
- Power Supply for Pentium II, SPARC, ALPHA and PA-RISC Microprocessors
- High Power 5V or 12V to 1.8V-3.5V Regulators
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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:
LTC1553
LTC1553L
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.
