1FEATURES
2• 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-CAP™ 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

DESCRIPTION
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-CAP™ 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 (softoff)
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.