MMPF0100 datasheet(54/136 Pages) FREESCALE

54 / 136 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

PF0100

Functional Block Requirements and Behaviors

Power Generation

7.4.4.4

SW2

SW2 is a single phase, 2.0 A rated buck regulator. Table 29 describes the modes, and Table 30 show the options for the

SWxMODE[3:0] bits.

Figure 14 shows the block diagram and the external component connections for SW2 regulator.

Driver

Controller

Internal

Compensation

SW2IN

SW2LX

SW2FB

ISENSE

COSW2

CINSW2

LSW2

I2C

Interface

GNDSW2

SW2

SW2MODE

SW2FAULT

VREF

DAC

I2C

VIN

Figure 14. 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 54 shows the

output voltage coding valid for SW2.

Table 54. SW2 Output Voltage Configuration

Low Output Voltage Range(35)

High Output Voltage Range

Set Point

SW2[6:0]

SW2 Output

Set Point

SW2[6:0]

SW2 Output

0000000

0.4000

1000000

0.8000

0000001

0.4250

1000001

0.8500

0000010

0.4500

1000010

0.9000

0000011

0.4750

1000011

0.9500

0000100

0.5000

1000100

1.0000

0000101

0.5250

1000101

1.0500

0000110

0.5500

1000110

1.1000

0000111

0.5750

1000111

1.1500

0001000

0.6000

1001000

1.2000

0001001

0.6250

1001001

1.2500

0001010

0.6500

1001010

1.3000

MMPF0100 Datasheet(PDF) 54 Page - Freescale Semiconductor, Inc

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