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参数资料
| 型号： | MC34704BEPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 39/54页 |
| 文件大小： | 0K |
| 描述： | IC PWR MNGMT DC-DC MULT 56-QFN |
| 特色产品： | MC34704 Multi-channel Power Management IC (PMIC) |
| 标准包装： | 1 |
| 应用： | 处理器 |
| 电流 - 电源： | 86mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-VFQFN 裸露焊盘 |
| 供应商设备封装： | 56-QFN-EP（7x7） |
| 包装： | 标准包装 |
| 产品目录页面： | 809 (CN2011-ZH PDF) |
| 其它名称： | MC34704BEPR2DKR |
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FUNCTIONAL DEVICE OPERATION
COMPONENT CALCULATION
COMPONENT CALCULATION
F SW1 AND GENERAL SOFT START
CONFIGURATION
The 34704 uses F SW1 as the switching frequency for
REG1(VG) thru REG5, and this can be changed by applying
a voltage between 0 to 2.5 V to the FREQ pin. If the FREQ
pin is left unconnected, the 34704 starts up with a default
frequency of 750 KHz. To configure the F SW1 , use a 2
resistors voltage divider from VDDI to ground to set the
voltage on the FREQ pin as indicated bellow:
Ratio
0
11/32
19/32
VDDI
Soft Start timing
[ms]
0.5
2.0
8.0
32.0
Ratio
0
F SW1
[KHz]
750
I DD max = 100 μΑ
V SS = V DDI ? ----------------------------------- ?
9/32
1000
VDDI
RSS2
? RSS1 + RSS2 ?
13/32
1250
RSS1
V SS
SS
RSS1, RSS2 tolerance ±1.0%
17/32
21/32
VDDI
1500
1750
2000
RSS2
GND
REGULATORS POWER STAGE AND
COMPENSATION CALCULATION
Notes
27. If an external voltage is used, F SW1 can only be set during
device startup.
Regulator 1 and 6 (Synchronous Boost - internally
compensated - REG1 is VG supply).
REG1 is a Synchronous Boost converter set to 5.0 V and
Maximum current of 500 mA while REG6 is set to 15 V at
V FREQ = V DDI ? ---------------------------- ?
VDDI
RF2
? RF1 + RF2 ?
60 mA (on the 34704B, REG1 does not exist but similar
circuitry is used to provide the internal VG voltage). They do
RF1
V FREQ
RF2
FREQ
GND
RF1, RF2 tolerance ±1.0%
not need an external compensation network, thus, the only
components that need to be calculated are:
? R1 and RB (Only REG6): These two resistors help to set
the output voltage to the desire value using a Vref=0.6 V,
select R1 between 10 k and 100 K and then calculate RB
as follows:
Initially at power up, the soft start time will be set for all of
RB = ---------------------
the regulators through programming the SS pin with an
external resistor divider connected between VDDI and AGND
as follows:
R1
Vo
----------- – 1
Vref
[ Ω ]
? L : A boost power stage can be designed to operate in
CCM for load currents above a certain level usually 5 to
15% of full load. The minimum value of inductor to
maintain CCM can be determined by using the following
procedure:
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
39
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