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.