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Description

1 Description

The TPS51206EVM-745 is designed to provide proper termination voltage and a 10-mA buffered

reference voltage for DDR memory which covers DDR2 (0.9VTT), DDR3 (0.75VTT), DDR3L (0.675VTT)

and DDR4 (0.6VTT) specifications with minimal external components.

1.1 Typical Applications

• DDR2/DDR3/DDR3L/DDR4 memory power supplies

• SSTL_18, SSTL_15, SSTL_135, and HSTL termination

1.2 Features

• VDD voltage: support 5-V rail and 3.3-V rail

• VLDOIN, VDDQ voltage range: 1.2 V–1.8 V

• Build-in, onboard transient load (with both sinking and sourcing capability) to emulate the sink/source

transient behavior which helps to evaluate the dynamic performance. For ease of use, both load step

and timing of transient can be modified by onboard resistors.

– DDR2 (0.9VTT): ± 1.8-A sink/source transient load

– DDR3 (0.75VTT): ± 1.5-A sink/source transient load

– DDR3L (0.675VTT): ± 1.35-A sink/source transient load

– DDR4 (0.6VTT): ± 1.2-A sink/source transient load

• Switch S1, S2 for S3 and S5 Enable function

• Convenient test points for probing VTT, VTTREF, CLK_IN and loop response testing

• Four-layer, printed-circuit board (PCB) with all the components on the bottom side

2 Electrical Performance Specifications

Table 1. TPS51206EVM-745 Electrical Performance Specifications

(1)

Parameter Test Conditions Min Typ Max Units

Input Characteristics

VDD voltage range 5/3.3 V

VDDQ voltage range 1.2 1.8 V

VLDOIN voltage range VTT+0.4 3.5 V

VTT and VTTREF Termination Voltage

DDR2 (0.9VTT) VTT 0.9 V

VTTREF 0.9

DDR3 (0.75VTT) VTT 0.75 V

VTTREF 0.75 V

DDR3L (0.675VTT) VTT 0.675 V

VTTREF 0.675 V

VTT 0.6 V

DDR4 (0.6VTT) VTTREF 0.6 V

VTT and VTTREF Termination Current

For DDR2(0.9VTT) and DDR3(0.75VTT) -2 2 A

VTT termination current(I

VTT

)

For DDR3L(0.675VTT) and DDR4(0.6VTT) –1.5 1.5

VTTREF termination current(IV

TTREF

) –10 10 mA

VTT Current Limit

VTT sink current limit 2 A

VTT source current limit 2 A

(1)

Note: Jumpers set to default locations, See Section 5 of this user’s guide

SLUU515–August 2011 Using the TPS51206EVM-745, 2-A Peak Sink/Source DDR Termination

Regulator With VTTREF Buffered Reference for DDR2, DDR3, DDR3L, and

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