参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 57/159页
文件大小: 0K
描述: IC POWER MANAGEMENT 206MAPBGA
标准包装: 160
应用: 通用
电源电压: 1.8 V ~ 4.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 206-LFBGA
供应商设备封装: 206-MAPBGA(13x13)
包装: 托盘
Functional Block Description
BP
C INSW4A
SWAIN
I SENSE
SW4AMODE
SW4
L SW4A
C OSW4A
SW4ALX
D SW4A
Driver
Controller
SW4AFAULT
GNDSW4A
Internal
Compensation
Z2
SPI
SW4AFB
Z1
EA
DAC
V REF
SPI
C INSW4B
BP
SW4BIN
I SENSE
SW4BMODE
Interface
L SW4B
C OSW4B
SW4BLX
D SW4B
Driver
Controller
SW4BFAULT
GNDSW4B
Internal
Compensation
Z2
SPI
VCORE
SW4BFB
Z1
EA
DAC
V REF
SW4CFG
Figure 14. SW4 Dual Phase Output Mode 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 SW4xFAULT SPI bit and issue an SCPI
interrupt via the INT pin.
SW4A/B has a high output range (2.5 V, 3.15 V) and a low output range (1.2 V – 1.85 V). The SW4A/B output range is set by the
PUMS configuration at start-up and cannot be changed dynamically by software. This means if the PUMS are set to allow SW4A
to come up in the high output voltage range, the output can only be changed between 2.5 V or 3.15 V. It cannot be programmed
in the low output range. If software sets the SW4AHI[1:0] = 00 when the PUMS is set to come up in the high voltage range, the
output voltage will only go as low as the lowest setting in the high range, which is 2.5 V. If the PUMS are set to start-up in the low
output voltage range, the voltage is controlled through the SW4x[4:0] bits by software, it cannot be programmed into the high
voltage range. When changing the voltage in either the high or low voltage range, the regulator should be forced into PWM mode
to change the voltage.
Table 44. SW4A/B Output Voltage Select
SW4xHI[1:0]
00
01
10
11
Set point selected by
SW4x[4:0]
SW4xHI[1:0]
SW4xHI[1:0]
Invalid
Output Voltage
2.5 V
3.15 V
Invalid
MC34708
Analog Integrated Circuit Device Data ?
57
Freescale Semiconductor
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