MMPF0200Z datasheet(46/118 Pages) NXP

46 / 118 page

Analog Integrated Circuit Device Data



Freescale Semiconductor

PF0200Z

Functional Block Requirements and Behaviors

Power Generation

Figure 12. SW1AB Efficiency Waveforms

6.4.4.4

SW2

SW2 is a single phase, 1.5 A rated buck regulator. Table 28 describes the modes, and Table 29 show the options for the

SWxMODE[3:0] bits.

Figure 13 shows the block diagram and the external component connections for SW2 regulator.

Figure 13. SW2 Block Diagram

SW2 Setup and Control Registers

SW2 output voltage is programmable from 0.400 to 3.300 V; however, bit SW2[6] in register SW2VOLT is read-only during

normal operation. Its value is determined by the default configuration, or may be changed by using the OTP registers. Therefore,

once SW2[6] is set to “0”, the output will be limited to the lower output voltages from 0.400 to 1.975 V with 25 mV increments, as

determined by bits SW2[5:0]. Likewise, once bit SW2[6] is set to “1”, the output voltage will be limited to the higher output voltage

range from 0.800 to 3.300 V with 50 mV increments, as determined by bits SW2[5:0].

In order to optimize the performance of the regulator, it is recommended that only voltages from 2.000 to 3.300 V be used in the

high range, and the lower range be used for voltages from 0.400 to 1.975 V.

The output voltage set point is independently programmed for Normal, Standby, and Sleep mode by setting the SW2[5:0],

SW2STBY[5:0] and SW2OFF[5:0] bits, respectively. However, the initial state of bit SW2[6] will be copied into bits SW2STBY[6],

and SW2OFF[6] bits. Therefore, the output voltage range will remain the same in all three operating modes. Table 48 shows the

output voltage coding valid for SW2. Note: Output voltages of 0.6 V and below are not supported.

100

0.1

100

1000

)

Load Current (mA)

PFM ‐ Vout = 1.2V

APS ‐ Vout = 1.2V

PWM ‐ Vout = 1.2v

SW1AB Single Phase

Driver

Controller

Internal

Compensation

SW2IN

SW2LX

SW2FB

ISENSE

COSW2

CINSW2

LSW2

I2C

Interface

SW2

SW2MODE

SW2FAULT

VREF

DAC

I2C

VIN

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