MMPF0100Z datasheet(76/128 Pages) NXP

76 / 128 page

NXP Semiconductors

PF0100Z

FUNCTIONAL BLOCK REQUIREMENTS AND BEHAVIORS

6.4.6.1

Transient response waveforms

Idealized stimulus and response waveforms for transient line and transient load tests are depicted in Figure 25. Note that the transient line

and load response refers to the overshoot, or undershoot only, excluding the DC shift.

Figure 25. Transient waveforms

6.4.6.2

Short-circuit protection

All general purpose LDOs have short-circuit protection capability. The short-circuit protection (SCP) system includes debounced fault

condition detection, regulator shutdown, and processor interrupt generation, to contain failures and minimize the chance of product

damage. If a short-circuit condition is detected, the LDO is disabled by resetting its VGENxEN bit, while at the same time, an interrupt

VGENxFAULTI is generated to flag the fault to the system processor. The VGENxFAULTI interrupt is maskable through the

VGENxFAULTM mask bit.

The SCP feature is enabled by setting the REGSCPEN bit. If this bit is not set, the regulators do not automatically disable upon a short-

circuit detection. However, the current limiter continues to limit the output current of the regulator. By default, the REGSCPEN is not set;

therefore, at start-up none of the regulators are disabled if an overloaded condition occurs. A fault interrupt, VGENxFAULTI, is generated

in an overload condition regardless of the state of the REGSCPEN bit. See Table 90 for SCP behavior configuration.

Table 90. Short-circuit behavior

REGSCPEN[0]

Short-circuit behavior

Current limit

Shutdown

10 us

VINx

Transient Line Stimulus

VINx_INITIAL

VINx_FINAL

1.0 us

IMAX/10

IMAX

ILOAD

Transient Load Stimulus

Undershoot

IL = IMAX/10

VOUT

VOUT Transient Load Response

IL = IMAX

Overshoot

Undershoot

VOUT

VOUT Transient Line Response

Overshoot

VINx_INITIAL

VINx_FINAL

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