参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 47/159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
7.5.4.2
Switching Frequency
A PLL generates the switching system clocking from the 32.768 kHz crystal oscillator reference. The switching frequency can be
programmed to 2.0 MHz or 4.0 MHz by setting the PLLX SPI bit as shown in Table 35 .
Table 35. Buck Regulator Frequency
PLLX
0
1
Switching Frequency (Hz)
2 000 000
4 000 000
The clocking system provides a near instantaneous activation when the Switching regulators are enabled or when exiting PFM
operation for PWM mode. The PLL can be configured for continuous operation with PLLEN = 1.
7.5.4.3
SW1
SW1 is fully integrated synchronous Buck PWM voltage mode control DC/DC regulator. It can be operated in single phase/dual
phase mode. The operating mode of the switching regulators is configured by the SW1CFG pin. The SW1CFG pin is sampled
at startup.
Table 36. SW1 Configuration
SW1CFG
VCOREDIG
Ground
B P
SW1IN
C INSW 1A
SW1A/B Configuration Mode
Single Phase Mode
Dual Phase Mode
I SENSE
SW1AMODE
SW1
L SW 1A
D SW1
SW1ALX
Driver
Controller
C OSW1A
GNDSW1A
SW1FAULT
Internal
Compensation
Z2
SPI
SW1FB
Z1
EA
DAC
V REF
SPI
Interface
BP
SW1BIN
C INSW 1B
I SENSE
SW1BMODE
SW1BLX
GNDSW1B
Driver
Controller
SW1BFAULT
VCOREDIG
SW1CFG
Figure 8. SW1 Single Phase Output Mode Block Diagram
MC34708
Analog Integrated Circuit Device Data ?
47
Freescale Semiconductor
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