PC34709VKR2 datasheet(56/142 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

34709

Functional Block Description

7.5.4.7

SW5

SW5 is fully integrated synchronous Buck PWM voltage mode control DC/DC regulator.

Figure 15. SW5 Block Diagram

The peak current is sensed internally for over-current protection purposes. If an over-current condition is detected the regulator

will limit the current through cycle by cycle operation and alert the system through the SW5FAULT SPI bit and issue an SCPI

interrupt via the INT pin.

SW5 can be programmed in step sizes of 25 mV as shown in Table 44. If the software wants to change the output voltage, after

power-up the regulator should be forced into PWM mode to change the voltage.

Table 44. SW5 Output Voltage Programmability

Set Point SW5[4:0]

SW5

Output (V)

Set Point

SW5[4:0]

SW5

Output (V)

00000

1.2000

10000

1.6000

00001

1.2250

10001

1.6250

00010

1.2500

10010

1.6500

00011

1.2750

10011

1.6750

00100

1.3000

10100

1.7000

00101

1.3250

10101

1.7250

00110

1.3500

10110

1.7500

00111

1.3750

10111

1.7750

01000

1.4000

11000

1.8000

01001

1.4250

11001

1.8250

01010

1.4500

11010

1.8500

01011

1.4750

01100

1.5000

01101

1.5250

01110

1.5500

01111

1.5750

Driver

Controller

Internal

Compensation

SW5IN

SW5LX

SW5FB

ISENSE

COSW5

CINSW5

LSW5

SPI

Interface

GNDSW5

SW5

SW5MODE

SW5FAULT

VREF

DAC

SPI

DSW5

PC34709VKR2 数据表(PDF) 56 Page - Freescale Semiconductor, Inc

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