特点
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
典型应用
描述
The LTC?1703 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 BurstMode? 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.