NCP51402

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5

General

The NCP51402 is a sink/source tracking termination

regulator specifically designed for low input voltage and

low external component count systems where space is a key

application parameter. The NCP51402 integrates a

high−performance, low−dropout (LDO) linear regulator

that is capable of both sourcing and sinking current. The

LDO regulator employs a fast feedback loop so that small

ceramic capacitors can be used to support the fast load

transient response. To achieve tight regulation with

minimum effect of trace resistance, a remote sensing

of the output capacitors as a separate trace from the high

is configured for standard DDR termination applications,

making it versatile and ideal for many types of low−power

LDO applications.

When it is configured for DDR termination applications,

memory application. It is capable of supporting both a

disabled and subsequently discharges to GND through an

internal 10 k

state.

EN − Enable Control

discharges to GND through an internal 18−

W MOSFET.

ms after the output exceeds the

100 k

supply voltage rail is required.

The LDO has a constant over−current limit (OCL). Note

that the OCL level reduces by one−half when the output

voltage is not within the power good window. This reduction

This shutdown is also non−latch protection.

Thermal Shutdown with Hysteresis

If the NCP51402 is to operate in elevated temperatures for

long durations, care should be taken to ensure that the

maximum operating junction temperature is not exceeded.

To guarantee safe operation, the NCP51402 provides

on−chip thermal shutdown protection. When the chip

junction temperature exceeds 150

°C, the part will shutdown.

When the junction temperature falls back to 125

°C, the

device

resumes

normal

operation.

If

the

junction

temperature exceeds the thermal shutdown threshold then

the internal discharge MOSFETs. The shutdown is a

non−latch protection.

Tracking Startup and Shutdown

The NCP51402 also supports tracking startup and

shutdown when EN is tied directly to the system bus and not

used to turn on or turn off the device. During tracking

within

below 360 mV, the internal discharge MOSFETs are turned