TPS51216RUKR Power Path Management IC Switching Controllers Memory Power Sol Sync Buck Controller

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.