Datasheet

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Test Procedure

5.2 Source Transient Load Selection

The source transient load selection can be set by J7.

Default setting: Jumper shorts on Pin1 and Pin2 of J7 to enable source transient load.

Table 3. Source Transient Load Selection

Jumper Set to Transient Load

1-2 pin shorted Enable

2-3 pin shorted Disable

5.3 Sink Transient Load Selection

The sink transient load selection can be set by J8.

Default setting: Jumper shorts on Pin1 and Pin2 of J8 to enable sink transient load.

Table 4. Sink Transient Load Selection

Jumper Set to Transient Load

1-2 pin shorted Enable

No Jumper shorted Disable

5.4 S1, S2 Enable Selection

The controller can be enabled and disabled by switch S1 and S2.

Default setting: Push S1 and S2 to the TOP (OFF position) to disable the controller.

Table 5. S3, S5 Enable Selection

S2 Switch(S3) Set to S1 Switch(S5) Set to VTTREF VTT

ON position ON position ON ON

OFF position ON position ON OFF(High-Z)

OFF position OFF position OFF(Discharge) OFF(Discharge)

6 Test Procedure

6.1 DDR2 (0.9VTT)/DDR3 (0.75VTT)/DDR3L (0.675VTT)/DDR4 (0.6VTT) Source Load

Regulation

1. Ensure jumper shorts on Pin2 and Pin3 of J6.

2. Ensure jumper shorts on Pin1 and Pin2 of J7, J8.

3. Ensure switches S1 and S2 to OFF position.

4. Set VTT load to 0 A.

5. Increase VDD (VDD dc Source1) from 0 V to 5 V at J1. This is the bias supply needed for TPS51206

operation. Using V1, verify VDD voltage between 4.8 V and 5 V.

6. Increase VLDOIN voltage (VLDOIN dc Source2) from 0 V to 1.8 V for DDR2 or 1.5 V for DDR3 or 1.35

V for DDR3 or 1.2 V for DDR3L at J4. This is the LDO input. Using V2, verify VLDOIN voltage.

7. Set switches S1, S2 to ON position.

8. Use V3, V4 to measure VTT, VTTREF voltage.

9. Increase load from 0 A to 1.5 A.

10. Verify V2 and adjust VLDOIN if necessary.

11. Use V3, V4 to measure VTT, VTTREF voltage.

12. Decrease load to 0 A.

13. Set switches S1, S2 to OFF position.

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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DDR4