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MC34708 Datasheet(PDF) 60 Page - Freescale Semiconductor, Inc

Part # MC34708
Description  Power Management Integrated Circuit (PMIC) for i.MX50/53 Families
PDF  159 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34708 Datasheet(HTML) 60 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
60
MC34708
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 47. 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 47. SW5 Output Voltage Programmability
Set Point SW5[4:0]
SW5
Output (V)
Set Point
SW5[4:0]
SW5
Output (V)
0
00000
1.2000
16
10000
1.6000
1
00001
1.2250
17
10001
1.6250
2
00010
1.2500
18
10010
1.6500
3
00011
1.2750
19
10011
1.6750
4
00100
1.3000
20
10100
1.7000
5
00101
1.3250
21
10101
1.7250
6
00110
1.3500
22
10110
1.7500
7
00111
1.3750
23
10111
1.7750
8
01000
1.4000
24
11000
1.8000
9
01001
1.4250
25
11001
1.8250
10
01010
1.4500
26
11010
1.8500
11
01011
1.4750
-
-
-
12
01100
1.5000
-
-
-
13
01101
1.5250
-
-
-
14
01110
1.5500
-
-
-
15
01111
1.5750
-
-
-
Driver
Controller
EA
Z1
Z2
Internal
Compensation
SW5IN
SW5LX
SW5FB
ISENSE
COSW5
CINSW5
LSW5
SPI
Interface
GNDSW5
SW5
SW5MODE
SW5FAULT
VREF
DAC
SPI
BP
DSW5



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