描述 The TPS51916 device provides a complete power supply for DDR2, DDR3, DDR3L, and DDR4 memory systems in the lowest total cost and minimum space. It integrates a synchronous buck regulator controller (VDDQ) with a 2-A sink and 2-A source tracking LDO (VTT) and buffered low noise reference (VTTREF).The device employs D-CAP? mode coupled with 300?kHz or 400?kHz frequencies for ease-of-use and fast transient response or D-CAP2? mode coupled with higher 500?kHz or 670?kHz frequencies to support ceramic output capacitor without an external compensation circuit. The VTTREF tracks VDDQ/2 within excellent 0.8% accuracy. The VTT, which provides 2-A sink and 2-A source peak current capabilities, requires only 10-μF of ceramic capacitance. A dedicated LDO supply input is available.The device also provides excellent power supply performance. It supports flexible power state control, placing VTT at high-Z in S3 and discharging VDDQ, VTT and VTTREF (soft-off) in S4 or S5 state. Programmable OCL with low-side MOSFET RDS(on) sensing, OVP, UVP, UVLO and thermal shutdown protections are also available.特性Synchronous Buck Controller (VDDQ) Conversion Voltage Range: 3 V to 28 V Output Voltage Range: 0.7 V to 1.8 V 0.8% VREF Accuracy Selectable Control Architecture D-CAP? Mode for Fast Transient Response D-CAP2 Mode for Ceramic Output Capacitors Selectable 300?kHz, 400?kHz, 500?kHz, or 670?kHz Switching Frequencies Optimized Efficiency at Light and Heavy Loads with Auto-skip Function Supports Soft-Off in S4 and S5 States OCL/OVP/UVP/UVLO Protections Powergood Output 2-A LDO(VTT), Buffered Reference(VTTREF) 2-A (Peak) Sink and Source Current Buffered, Low Noise, 10-mA VTTREF Output 0.8% VTTREF, 20-mV VTT Accuracy Supports High-Z (S3) and Soft-Off (S4, S5) Thermal Shutdown 20-Pin, 3 mm × 3 mm, QFN Package Create a WEBENCH Design