MPF7100BVBA2ES datasheet(60/125 Pages) NXP

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NXP Semiconductors

PF7100

7-channel power management integrated circuit for high performance applications

PF7100

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Product data sheet

Rev. 4 — 9 March 2021

60 / 125

settings and 1.8 V, the switching regulator is automatically disabled first and then re-

enabled at the selected voltage level to avoid an uncontrolled transition to the new

voltage setting.

Each regulator is provided with 2 bits to set its mode of operation.

• The SWx_RUN_MODE[1:0] bits allow the user to change the mode of operation of the

SWx regulators during the run state. If the regulator was programmed as part of the

power up sequence, the SWx_RUN_MODE[1:0] bits are loaded with 0b11 (autoskip) by

default. Otherwise it is loaded with 0b11 (disabled).

• The SWx_STBY_MODE[1:0] bits allow the user to change the mode of operation of

the SWx regulators during the standby state. If the regulator was programmed as part

of the power up sequence, the SWx_STBY_MODE[1:0] bits are loaded with 0b11

(autoskip) by default. Otherwise, it is loaded with 0b11 (disabled).

Table 44. SW regulator mode configuration

SWx_MODE[1:0]

Mode of operation

OFF

PWM mode

PFM mode

Auto skip mode

The SWx_MODE_I interrupt asserts the INTB pin when any of the Type 1 regulators

have changed the mode of operation, provided the corresponding interrupt is not

masked.

To avoid potential detection of an OV/UV fault during SWx ramp up, it is recommended to

power up the regulator in PWM or auto skip mode.

SW1 to SW4 regulators use 2 bits SWxILIM[1:0], to program the current limit detection.

Table 45. SWx current limit selection

SWxILIM[1:0]

Typical current limit

2.1 A

2.6 A

3.0 A

4.5 A

The current limit specification is given with respect to the inductor peak current. To

calculate the DC current at which the buck regulator enters into current limitation, it is

necessary to calculate the inductor ripple current. An ideal approximation is enough to

obtain the ripple current as follows:

ΔiL = VOUT × (1 − VOUT/VIN)/(L × FSW)

L is the inductance value and FSW is the selected switching frequency.

The DC current limit is then calculated by:

DC ILIM = ILIM − (ΔiL / 2)

In order to account for component tolerances, use the minimum inductor value per the

inductor specification.

During single phase operation, all buck regulators use 3 bits (SWxPHASE[2:0]) to control

the phase shift of the switching frequency. The default switching phase is loaded from

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