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34708 Datasheet(PDF) 53 Page - Freescale Semiconductor, Inc

Part # 34708
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

34708 Datasheet(HTML) 53 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
53
Freescale Semiconductor
MC34708
Functional Block Description
7.5.4.5
SW3
SW3 is fully integrated synchronous Buck PWM voltage mode control DC/DC regulator.
Figure 11. SW3 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 SW3FAULT SPI bit and issue an SCPI
interrupt via the INT pin.
SW3 can be programmed in step sizes of 25 mV as shown in Table 41.
Table 41. SW3 Output Voltage Programmability
Set Point
SW3[4:0]
SW3 Output (V)
Set Point
SW3[4:0]
SW3 Output (V)
0
00000
0.6500
16
10000
1.0500
1
00001
0.6750
17
10001
1.0750
2
00010
0.7000
18
10010
1.1000
3
00011
0.7250
19
10011
1.1250
4
00100
0.7500
20
10100
1.1500
5
00101
0.7750
21
10101
1.1750
6
00110
0.8000
22
10110
1.2000
7
00111
0.8250
23
10111
1.2250
8
01000
0.8500
24
11000
1.2500
9
01001
0.8750
25
11001
1.2750
10
01010
0.9000
26
11010
1.3000
11
01011
0.9250
27
11011
1.3250
12
01100
0.9500
28
11100
1.3500
13
01101
0.9750
29
11101
1.3750
14
01110
1.0000
30
11110
1.4000
15
01111
1.0250
31
11111
1.4250
Driver
Controller
EA
Z1
Z2
Internal
Compensation
SW3IN
SW3LX
SW3FB
ISENSE
C
OSW3
CINSW 3
LSW3
SPI
Interface
GNDSW3
SW3
SW3MODE
SW3FAULT
VREF
DAC
SPI
BP
DSW3



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