MMPF0200Z datasheet(35/118 Pages) NXP

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Analog Integrated Circuit Device Data



Freescale Semiconductor

PF0200Z

Functional Block Requirements and Behaviors

Power Generation

6.4.4

Buck Regulators

Each buck regulator is capable of operating in PFM, APS, and PWM switching modes.

6.4.4.1

Current Limit

Each buck regulator has a programmable current limit. In an overcurrent condition, the current is limited cycle-by-cycle. If the

current limit condition persists for more than 8.0 ms, a fault interrupt is generated.

6.4.4.2

General Control

To improve system efficiency the buck regulators can operate in different switching modes. Changing between switching modes

can occur by any of the following means: I2C programming, exiting/entering the Standby mode, exiting/entering Sleep mode, and

load current variation. Available switching modes for buck regulators are presented in Table 28.

During soft-start of the buck regulators, the controller transitions through the PFM, APS, and PWM switching modes. 3.0 ms

(typical) after the output voltage reaches regulation, the controller transitions to the selected switching mode. Depending on the

particular switching mode selected, additional ripple may be observed on the output voltage rail as the controller transitions

between switching modes.

Table 28. Switching Mode Description

Mode

Description

OFF

The regulator is switched off and the output voltage is discharged.

PFM

In this mode, the regulator is always in PFM mode, which is useful at light loads for

optimized efficiency.

PWM

In this mode, the regulator is always in PWM mode operation regardless of load conditions.

APS

In this mode, the regulator moves automatically between pulse skipping mode and PWM

mode depending on load conditions.

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