LTC1736 - 5-Bit Adjustable High Efficiency Synchronous Step-Down Switching Regulator
Features
- Dual N-Channel MOSFET Synchronous Drive
- Synchronizable/Programmable Fixed Frequency
- Wide VIN Range: 3.5V to 36V Operation
- 5-Bit Digital-to-Analog VOUT Selection:
0.925V to 2.00V Range with 50mV/25mV Steps - OPTI-LOOP™ Compensation Minimizes COUT
- ±1% Output Voltage Accuracy
- Power Good Output Voltage Monitor
- Output Overvoltage Crowbar Protection
- Internal Current Foldback
- Latched Short-Circuit Shutdown Timer with Defeat Option
- Forced Continuous Control Pin
- Optional Programmable Soft-Start
- Remote Output Voltage Sense
- Available in 24-Lead SSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC1736 is a synchronous step-down switching regulator controller optimized for CPU power. The output voltage is programmed by a 5-bit digital-to-analog converter (DAC) that adjusts the output voltage from 0.925V to 2.00V according to Intel mobile VID specifications. The 0.8V reference is compatible with future microprocessor generations. The operating frequency (synchronizable up to 500kHz) is set by an external capacitor allowing maximum flexibility in optimizing efficiency. The output voltage is monitored by a power good window comparator that indicates when the output is within 7.5% of its programmed value. Protection features include: internal foldback current limiting, output overvoltage crowbar and optional short-circuit shutdown. Soft-start is provided by an external capacitor that can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum). Pin defeatable Burst Mode operation provides high efficiency at low load currents. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.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 |
|---|---|---|---|---|---|
| LTC1736CG#PBF | SSOP-24 | G | C | 05-08-1640 (G24) | Yes |
| LTC1736CG#TRPBF | SSOP-24 | G | C | 05-08-1640 (G24) | Yes |
| LTC1736IG#PBF | SSOP-24 | G | I | 05-08-1640 (G24) | Yes |
| LTC1736IG#TRPBF | SSOP-24 | G | I | 05-08-1640 (G24) | 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 | |
|---|---|---|---|---|---|---|
| LTC1736CG#PBF | SSOP-24 | C | $4.15 | $3.50 | Yes | |
| LTC1736CG#TRPBF | SSOP-24 | C | $3.60 | Yes | ||
| LTC1736IG#PBF | SSOP-24 | I | $5.65 | $4.65 | Yes | |
| LTC1736IG#TRPBF | SSOP-24 | I | $4.75 | 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 |
|---|---|---|---|
| DC252A | LTC1736CG | 5 Bit, VID CPU Power Converter, Vin = 5V to 24V, Vout = 0.9V to 2.0V @ 12A | $150.00 | |
| DC279A-B | LTC1736, LTC1772, LTC1762 | Low Cost VRM (Intel), 7.5 to 24Vin, 1.3V to 1.6Vout @ 14A, 1.5Vout @ 0.12 to 2.5A, 2.5Vout @ 0.15A | Contact Factory | |
| Buy Now | |||
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 | |
|---|---|---|---|---|---|---|
| LTC1736IG#PBF | SSOP-24 | I | $5.65 | $4.65 | Yes | |
| LTC1736IG#TRPBF | SSOP-24 | I | $4.75 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Notebook and Palmtop Computers, PDAs
- Power Supply for Mobile Pentium® II and Pentium III Processors
- Low Voltage Power Supplies
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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:
LTC1736
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.
