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MC34704BEP bảng dữ liệu(PDF) 6 Page - Freescale Semiconductor, Inc

tên linh kiện MC34704BEP
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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MC34704BEP bảng dữ liệu(HTML) 6 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
6
Freescale Semiconductor
34704
PIN CONNECTIONS
30
A
FB7
Input
REG7 voltage feedback
input for voltage
regulation/programming
Connect the feedback resistor divider to this pin.
B
AGND1
-
-
Pin 30 is connected to AGND
31
A
DRV7
Output
REG7 external Power
MOSFET gate drive
REG7 external Power MOSFET gate drive.
B
NC3
No Connect
-
Pin 31 is not connected
32
A
VOUT7
Output
REG7 output voltage
return pin.
This is the discharge path of REG7 output voltage.
B
PGND1
-
-
Pin 32 is connected to PGND
33
A
FB6
Input
REG6 voltage feedback
input for voltage
regulation/programming
Connect the feedback resistor divider to this pin.
B
AGND2
-
-
Pin 33 is connected to AGND
34
A
BT6
Passive
REG6 bootstrap capacitor
input pin.
Connect a 0.01
μF capacitor between this pin and SW6 pin to
enhance the gate of the Synchronous Power MOSFET.
B
NC4
No Connect
-
Pin 34 is not connected
35
A
B
SW6
Output
-
REG6 switching node
The inductor is connected between this pin and the VIN pin.
B
PGND2
-
-
Pin 35 is connected to PGND
36
A
VOUT6
Output
REG6 regulated output
voltage pin
Connect this pin directly to the load directly and to the output
filter as close to the pin as possible.
B
PGND3
-
-
Pin 36 is connected to PGND
37
A/B
AGND
Ground
Analog ground of the IC
Analog ground of the IC.
38
A/B
VIN
Power
Battery voltage
connection
Input decoupling /filtering is required for the device to operate
properly.
39
A/B
VDDI
Output
Internal supply voltage
Connect a 1
μF low ESR decoupling filter capacitor between this
pin and GND.
40
A/B
LION
Input
Battery Detection
Pull this pin high to VIN to indicate a connection to a Li-Ion
battery
41
A/B
ONOFF
Input
Dual function IC turn On/
Off
This is a hardware enable/disable for the 34704A/B. It can be
connected to a mechanical switch to turn the power On or Off.
42
A/B
BT2U
Passive
REG2 Boost Stage
bootstrap capacitor input
pin
Connect a 1
μF capacitor between this pin and SW2U pin to
enhance the gate of the Switch Power MOSFET.
43
A/B
COMP2
Passive
REG2 compensation
network connection
REG2 compensation network connection.
44
A/B
FB2
Input
REG2 voltage feedback
input for voltage
regulation/programming
Connect the feedback resistor divider to this pin.
45
A/B
BT2D
Passive
REG2 Buck Stage
bootstrap capacitor input
pin
Connect a 1
μF capacitor between this pin and SW2D pin to
enhance the gate of the Switch Power MOSFET.
Table 2. 34704 Pin Definitions (continued)
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


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