LTC1703
Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID
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Overview
Features and Benefits
- Side 1 Output Is Compliant with Intel Mobile VID Specifications (Includes 5-Bit DAC)
- 0.9V to 2.0V Output Voltage with 25mV/50mV Steps
- Two Sides Run Out-of-Phase to Minimize CIN
- Precision Internal 0.8V ±1% Reference
- Two Independent PWM Controllers in One Package
- All N-Channel External MOSFET Architecture
- No External Current Sense Resistor
- 550kHz Switching Frequency Minimizes External Component Size
- Very Fast Transient Response
- Up to 25A Output Current per Channel
- Low Shutdown Current: < 100µA
- Small 28-Pin SSOP Package
Product Details
The LTC1703 is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers. Each is designed to drive a pair of external N-channel MOSFET devices in a voltage mode feedback, synchronous buck configuration. The LTC1703 includes digital output voltage adjustment on side 1 that conforms to the Intel Mobile VID specification. It uses a constant-frequency, true PWM design switching at 550kHz, minimizing external component size and cost and optimizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode® operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.
The LTC1703 features an onboard reference trimmed to 1% and delivers better than 1.5% regulation at the converter outputs. An optional latching FAULT mode protects the load if the output rises 15% above the intended voltage. Each channel can be enabled independently; with both channels disabled, the LTC1703 shuts down and supply current drops below 100µA.
Applications
- Mobile Pentium® III Processor Systems
- Microprocessor Core and I/O Supplies
- Multiple Logic Supply Generator
- High Efficiency Power Conversion
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Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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LTC1703
Product Recommendations
LTC1703 Companion Parts
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC1703CG#PBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| LTC1703CG#TRPBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| LTC1703IG#PBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| LTC1703IG#TRPBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| Wafer Fabrication Data | R384 Reliability Data |
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