MMPF0100 datasheet(72/136 Pages) FREESCALE

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Driver

Controller

Internal

Compensation

SW4IN

SW4LX

SW4FB

ISENSE

COSW4

CINSW4

LSW4

I2C

Interface

GNDSW4

SW4

SW4MODE

SW4FAULT

VREF

DAC

I2C

VIN

Analog Integrated Circuit Device Data

Freescale Semiconductor

PF0100

Functional Block Requirements and Behaviors

Power Generation

Figure 20. SW4 Block Diagram

SW4 Setup and Control Registers

To set the SW4 in regulator or VTT mode, bit VTT of the register OTP_SW4_CONF register on Extended Page 1, is programmed

during OTP or TBB configuration; setting bit VTT to “1” will enable SW4 to operate in VTT mode and “0” in Regulator mode. See

One Time Programmability (OTP) for detailed information on OTP configuration.

In Regulator mode, the SW4 output voltage is programmable from 0.400 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 will be limited to the lower output voltages, from 0.400 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 will be

limited to the higher output voltage range from 0.800 to 3.300 V with 50 mV increments, as determined by the SW4[5:0] bits.

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 that that 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 SW4[5:0],

SW4STBY[5:0], and SW4OFF[5:0] bits, respectively. However, the initial state of the SW4[6] bit will be copied into bits

SW4STBY[6], and SW4OFF[6] bits, so the output voltage range will remain the same on all three operating modes. Table 78

shows the output voltage coding valid for SW4.

Table 78. SW4 Output Voltage Configuration

Low Output Voltage Range(43)

High Output Voltage Range

Set Point

SW4[6:0]

SW4 Output

Set Point

SW4[6:0]

SW4 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

0001011

0.6750

1001011

1.3500

0001100

0.7000

1001100

1.4000

MMPF0100 数据表(PDF) 72 Page - Freescale Semiconductor, Inc

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