TPS51216 51216 Power controller for DDR2 DDR3 DDR3L

Complete DDR2, DDR3 and DDR3L Memory Power Solution Synchronous Buck Controller, 2-ALDO, Buffered Reference FEATURES: - 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 – D-CAPTM Mode for Fast Transient Response – Selectable 300 kHz/400 kHz Switching Frequencies – Optimized Efficiency at Light and Heavy Loads with Auto-skip Function – Supports Soft-Off in S4/S5 States – OCL/OVP/UVP/UVLO Protections – Powergood Output - 2-A LDO(VTT), Buffered Reference(VTTREF) – 2-A (Peak) Sink and Source Current – Requires Only 10-μF of Ceramic Output Capacitance – Buffered, Low Noise, 10-mA VTTREF Output – 0.8% VTTREF, 20-mV VTT Accuracy – Support High-Z in S3 and Soft-Off in S4/S5 - Thermal Shutdown - 20-Pin, 3 mm × 3 mm, QFN Package APPLICATIONS • DDR2/DDR3/DDR3L Memory Power Supplies • SSTL_18, SSTL_15, SSTL_135 and HSTL Termination The TPS51216 provides a complete power supply for DDR2, DDR3 and DDR3L memory systems in the lowest total cost and minimum space. It integrates a synchronous buck regulator controller (VDDQ) with a 2-A sink/source tracking LDO (VTT) and buffered low noise reference (VTTREF). The TPS51216 employs D-CAPTM mode coupled with 300 kHz/400 kHz frequencies for ease-of-use and fast transient response. The VTTREF tracks VDDQ/2 within excellent 0.8% accuracy. The VTT, which provides 2- A sink/source peak current capabilities, requires only 10-μF of ceramic capacitance. In addition, a dedicated LDO supply input is available. The TPS51216 provides rich useful functions as well as 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/S5 state. Programmable OCL with low-side MOSFET RDS(on) sensing, OVP/UVP/UVLO and thermal shutdown protections are also available. The TPS51216 is available in a 20-pin, 3 mm × 3 mm, QFN package and is specified for ambient temperature from –40°C to 85°C.