MMPF0100Z datasheet(72/128 Pages) NXP

72 / 128 page

NXP Semiconductors

PF0100Z

FUNCTIONAL BLOCK REQUIREMENTS AND BEHAVIORS

Figure 22. SW4 efficiency waveforms

6.4.5

Boost regulator

SWBST is a boost regulator with a programmable output from 5.0 V to 5.15 V. SWBST can supply the VUSB regulator for the USB PHY

in OTG mode, as well as the VBUS voltage. Note that the parasitic leakage path for a boost regulator causes the SWBSTOUT and

SWBSTFB voltage to be a Schottky drop below the input voltage whenever SWBST is disabled. The switching NMOS transistor is

integrated on-chip. Figure 23 shows the block diagram and component connection for the boost regulator.

RSW4DIS

Discharge Resistance

–

600

–

Notes

56.

When the output is set to > 2.6 V, the output follows the input down when VIN gets near 2.8 V.

57.

The higher output voltages available depend on the voltage drop in the conduction path as given by the following equation:

(VINSW4 - VSW4) = ISW4* (DCR of Inductor +RONSW4P + PCB trace resistance).

Table 86. SW4 electrical characteristics (continued)

All parameters are specified at PF0100Z TA = -40 °C to 85 °C, PF0100AZ TA = -40 °C to 105 °C, VIN = VINSW4 = 3.6 V, VSW4 = 1.8 V,

ISW4 = 100 mA, SW4_PWRSTG[2:0] = [101], typical external component values, fSW4 = 2.0 MHz, single/dual phase and independent

mode, unless otherwise noted. Typical values are characterized at VIN = VINSW4 = 3.6 V, VSW4 = 1.8 V, ISW4 = 100 mA,

SW4_PWRSTG[2:0] = [101], and 25 °C, unless otherwise noted.

Symbol

Parameter

Min.

Typ.

Max.

Unit

Notes

Load current (mA)

100

0.1

100

1000

PFM - Vout = 1.8V

APS - Vout = 1.8V

PWM - Vout = 1.8V

PWM - Vout = 0.75V

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