Analog Devices LTC7803-3.3 | Demoboard LTC7803-3.3

Description

The LTC®7803-3.3 is a high performance synchronous step-down DC/DC switching regulator controller that drives an all N-channel power MOSFET stage.Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements. A constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7803‑3.3 operates from a wide 4.5V to 40V input supply range and regulates the output to a fixed 3.3V voltage using an internal feedback resistor divider.The very low no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.The MODE pin selects among Burst Mode operation,pulse-skipping mode, or continuous inductor current mode at light loads.The LTC7803-3.3 additionally features spread spectrum operation which significantly reduces the peak radiatedand conducted noise on both the input and output supplies,making it easier to comply with electromagnetic interference (EMI) standards.

Features

• Low Operating IQ: 12μA (14V VIN to 3.3V VOUT)
• Wide Input Voltage Range: 4.5V to 40V
• Fixed 3.3V Regulated Output Voltage
• Spread Spectrum Operation
• RSENSE or DCR Current Sensing
• Programmable Fixed Frequency (100kHz to 3MHz)
• Phase-Lockable Frequency (100kHz to 3MHz)
• Selectable Continuous, Pulse-Skipping, or Low Ripple Burst -Mode® Operation at Light Loads
• Low Shutdown IQ: 1.2μA
• Thermally Enhanced 16-Lead 3mm × 3mm QFN Package
• AEC-Q100 Qualified for Automotive Applications

Typical applications

• Industrial
• Military/Avionics
• Telecommunications
• Automotive and Transportation

More information

• Datasheet
• IC product information