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MC34704BR2 bảng dữ liệu(PDF) 4 Page - Freescale Semiconductor, Inc

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Giải thích chi tiết về linh kiện  Multiple Channel DC-DC Power Management IC
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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MC34704BR2 bảng dữ liệu(HTML) 4 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
4
Freescale Semiconductor
34704
PIN CONNECTIONS
PIN CONNECTIONS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 16 17 18 19 20 21 22 23 24 25 26 27 28
42
41
40
39
38
37
36
35
34
33
32
31
30
29
56 55 54 53 52 51 50 49 48 47 46 45 44 43
57
Exposed Pad
PGND
BT5U
BT4D
PVIN4
SW4D
VOUT4
SW4U
BT4U
FB4
COMP4
BT3
PVIN3
SW3
VOUT3
FB3
BT2U
ONOFF
LION
VDDI
VIN
AGND
VOUT6
SW6
BT6
FB6
VOUT7
DRV7
FB7
VREF7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 16 17 18 19 20 21 22 23 24 25 26 27 28
42
41
40
39
38
37
36
35
34
33
32
31
30
29
56 55 54 53 52 51 50 49 48 47 46 45 44 43
57
Exposed Pad
PGND
BT5U
BT4D
PVIN4
SW4D
VOUT4
SW4U
BT4U
FB4
COMP4
BT3
PVIN3
SW3
VOUT3
FB3
BT2U
ONOFF
LION
VDDI
VIN
AGND
PGND5
PGND4
NC4
AGND3
PGND2
NC3
AGND1
NC2
34704A
34704B
Figure 3. 34704 Pin Connections
Table 2. 34704 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 17.
Pin Number Device Pin Name Pin Function
Formal Name
Definition
1
A/B
BT5U
Passive
REG5 Boost Stage
bootstrap capacitor input
pin
Connect a 1.0
μF capacitor between this pin and SW5U pin to
enhance the gate of the Switch Power MOSFET.
2
A/B
BT4D
Passive
REG4 Buck Stage
bootstrap capacitor input
pin
Connect a 0.01
μF capacitor between this pin and SW4D pin to
enhance the gate of the Switch Power MOSFET.
3
A/B
PVIN4
Power
REG4 power supply input
voltage
This is the connection to the drain of the high side switch FET.
Input decoupling /filtering is required for proper REG4 operation.
Use a 10uf decoupling capacitor for better performance.
4
A/B
SW4D
Input/Output
REG4 Buck Stage
switching node
The inductor is connected between this pin and the SW4U pin.
5
A/B
VOUT4
Output
REG4 regulated output
voltage pin
Connect this pin to the load and to the output filter as close to
the pin as possible.
6
A/B
SW4U
Input/Output
REG4 Boost Stage
switching node
The inductor is connected between this pin and the SW4D pin.
7
A/B
BT4U
Passive
REG4 Boost Stage
bootstrap capacitor input
pin
Connect a 0.01
μF capacitor between this pin and SW4U pin to
enhance the gate of the Switch Power MOSFET.
8
A/B
FB4
Input
REG4 voltage feedback
input for voltage
regulation/programming
Connect the feedback resistor divider to this pin.
9
A/B
COMP4
Passive
REG4 compensation
network connection
REG4 compensation network connection.
10
A/B
BT3
Passive
REG3 bootstrap capacitor
input pin
Connect a 0.01
μF capacitor between this pin and SW3 pin to
enhance the gate of the Switch Power MOSFET.


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