MMPF0100 datasheet(70/137 Pages) NXP

70 / 137 page

NXP Semiconductors

PF0100

FUNCTIONAL BLOCK REQUIREMENTS AND BEHAVIORS

Figure 25. SW3AB efficiency waveforms: VIN = 4.2 V; VOUT = 1.5 V; extended industrial version

6.4.4.5

SW4

SW4 is a 1.0 A rated single phase buck regulator capable of operating in two modes. In its default mode, it operates as a normal buck

regulator with a programmable output between 0.400 V and 3.300 V. It is capable of operating in the three available switching modes:

PFM, APS, and PWM, described on Table 30 and configured by the SW4MODE[3:0] bits, as shown in Table 31.

If the system requires DDR memory termination, SW4 can be used in its VTT mode. In the VTT mode, its reference voltage tracks the

output voltage of SW3A, scaled by 0.5. Furthermore, when in VTT mode, only the PWM switching mode is allowed. The VTT mode can

be configured by use of VTT bit in the OTP_SW4_CONFIG register.

Figure 26 shows the block diagram and the external component connections for the SW4 regulator.

Figure 26. SW4 block diagram

6.4.4.5.1

SW4 setup and control registers

To set the SW4 in regulator or VTT mode, bit VTT of the register OTP_SW4_CONF register in Table 137. Extended page 1, page 111, is

programmed during OTP or TBB configuration; setting bit VTT to “1” enables SW4 to operate in VTT mode and “0” in regulator mode. See

6.1.2 One time programmability (OTP), page 21 for detailed information on OTP configuration.

In regulator mode, the SW4 output voltage is programmable from 0.400 V to 3.300 V; however, bit SW4[6] in the SW4VOLT register is

read-only during normal operation. Its value is determined by the default configuration, or may be changed by using the OTP registers.

Once SW4[6] is set to “0”, the output is limited to the lower output voltages, from 0.400 V to 1.975 V with 25 mV increments, as determined

by the SW4[5:0] bits. Likewise, once the SW4[6] bit is set to "1", the output voltage is limited to the higher output voltage range from 0.800 V

to 3.300 V with 50 mV increments, as determined by the SW4[5:0] bits.

To optimize the performance of the regulator, it is recommended only voltages from 2.000 V to 3.300 V be used in the high range and the

lower range be used for voltages from 0.400 V to 1.975 V.

100

0.1

100

1000

)

Load Current (mA)

PFM

100

1000

10000

)

Load Current (mA)

APS

PWM

Driver

Controller

Internal

Compensation

SW4IN

SW4LX

SW4FB

ISENSE

COSW4

CINSW4

LSW4

I2C

Interface

SW4

SW4MODE

SW4FAULT

VREF

DAC

I2C

VIN

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