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Home > DDR Termination Regulators
UR5517 Datasheet


The UR5517 is a linear regulator which provides up to 3 Amp
bi-directional sourcing and sinking capability for DDR1/2/3 SDRAM
bus terminator applications. It only requires 20uF of ceramic output
capacitance by a integrated operational amplifier which provides fast
load transient response.
The UR5517 also includes two control pins, S3 & S5. If S3 were
set in low level, VTT will be turned off and left Hi-Z(sleep-state
mode).If setting S5 were set in low level, both VTT and VTTREF will
be turned off and discharged to ground(soft-off mode).
* Input Voltage Range::3~5.5V
* VLDOIN Voltage Range:1.2V~3.6V
* DDR1/2/3 Termination Voltage Applications
* Sourcing and Sinking Current up to 3A
* ±20mV Accuracy for VTT and VTTREF
* 10mA Buffered Reference(VTTREF)
* Supports High-Z in S3(STR) and Soft-off in S5(Shutdown)
* Integrated Divider Tracks 1/2 VDDQSNS for Both VTT&VTTREF
* Built-In Soft-Start
* Current Limiting Protection
* Thermal Shutdown Protection
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