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MC34704 Arkusz danych(PDF) 5 Page - Freescale Semiconductor, Inc

Numer części MC34704
Szczegółowy opis  Multiple Channel DC-DC Power Management IC
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Producent  FREESCALE [Freescale Semiconductor, Inc]
Strona internetowa  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34704 Arkusz danych(HTML) 5 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
5
34704
PIN CONNECTIONS
11
A/B
PVIN3
Power
REG3 power supply input
voltage
This is the connection to the drain of the high side switch FET.
Input decoupling /filtering is required for proper REG3 operation.
12
A/B
SW3
Output
REG3 switching node
The inductor is connected between this pin and the regulated
REG3 output.
13
A/B
VOUT3
Output
REG3 output voltage
return pin
This is the discharge path of REG3 output voltage.
14
A/B
FB3
Input
REG3 voltage feedback
input for voltage
regulation/programming
Connect the feedback resistor divider to this pin.
15
A/B
SS
Input
Soft start time
The soft start time for all regulators can be adjusted by
connecting this pin to an external resistor divider between VDDI
and AGND pins.
16
A/B
FREQ
Input
Oscillator frequency
The oscillator frequency can be adjusted by connecting this pin
to an external resistor divider between VDDI and AGND pins.
This pin sets FSW1 value.
17
A/B
FB8
Input
REG8 voltage feedback
input for voltage
regulation/programming
Connect the feedback resistor divider to this pin.
18
A/B
BT8
Passive
REG8 bootstrap capacitor
input pin
Connect a 0.01
μF capacitor between this pin and SW8 pin to
enhance the gate of the Synchronous Power MOSFET.
19
A/B
VOUT8
Output
REG8 regulated output
voltage pin
Connect this pin directly to the load directly and to the output
filter as close to the pin as possible.
20
A/B
SW8
Output
REG8 switching node
The inductor is connected between this pin and VIN pin.
21
A/B
SW1
Output
REG1 switching node
The inductor is connected between this pin and VIN Pin.
22
A/B
VG
Passive
REG1 regulated output
voltage before the cutoff
switch
REG1 regulated output voltage before the cut-off switch. This
supplies the internal circuits and the gate drive
23
A
VOUT1
Output
REG1 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
NC0
No Connect
-
Pin 23 is not connected.
24
A/B
BT1
Passive
REG1 bootstrap capacitor
input pin
Connect a 1
μF capacitor between this pin and SW1 pin to
enhance the gate of the Switch Power MOSFET.
25
A/B
SCL
Input/Output
I2C serial interface clock
input
I2C serial interface clock input.
26
A/B
SDA
Input/Output
I2C serial interface data
input
I2C serial interface data input.
27
A/B
RST
Open Drain
Power reset output signal
(Microprocessor Reset)
This is an open drain output and must be pulled up by an
external resistor to a supply voltage like VIN.
28
A
COMP7
Passive
REG7 compensation
network connection
REG7 compensation network connection.
B
NC1
No Connect
-
Pin 28 is not connected
29
A
VREF7
Output
REG7 resistor feedback
network reference voltage
Connect this pin to the bottom of the feedback resistor divider.
B
NC2
No Connect
-
Pin 29 is not connected
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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