Analog Devices LTC1703 Product Info

• 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 C_IN
• 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

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