MMPF0100 datasheet(63/136 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

PF0100

Functional Block Requirements and Behaviors

Power Generation

SW3A - SW3B Independent Outputs

SW3A and SW3B can be configured as independent outputs as shown in Figure 18, providing flexibility for applications requiring

more voltage rails with less current capability. Each output is configured and controlled independently by its respective I2C

registers as shown in Table 65.

Driver

Controller

Internal

Compensation

SW3AIN

SW3ALX

SW3AFB

ISENSE

COSW3A

CINSW3A

LSW3A

I2C

Interface

GNDSW3A

SW3A

SW3AMODE

SW3AFAULT

VREF

DAC

I2C

VIN

Driver

Controller

Internal

Compensation

SW3BIN

SW3BLX

SW3BFB

ISENSE

COSW3B

CINSW3B

LSW3B

GNDSW3B

SW3B

SW3BMODE

SW3BFAULT

VREF

DAC

I2C

VIN

Figure 18. SW3A/B Independent Output Block Diagram

SW3A/B Setup and Control Registers

SW3A/B output voltage is programmable from 0.400 to 3.300 V; however, bit SW3x[6] in register SW3xVOLT 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 SW3x[6] is set to “0”, the output will be limited to the lower output voltages from 0.40 to 1.975 V with 25 mV increments, as

determined by bits SW3x[5:0]. Likewise, once bit SW3x[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 SW3x[5:0].

In order to optimize the performance of the regulator, it is recommended that only voltages from 2.00 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 SW3x[5:0],

SW3xSTBY[5:0], and SW3xOFF[5:0] bits respectively; however, the initial state of the SW3x[6] bit will be copied into the

SW3xSTBY[6] and SW3xOFF[6] bits. Therefore, the output voltage range will remain the same on all three operating modes.

Table 64 shows the output voltage coding valid for SW3x.

MMPF0100 数据表(PDF) 63 Page - Freescale Semiconductor, Inc

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