PIN CONNECTIONS
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
11
A/B
PVIN3
REG3 power supply input This is the connection to the drain of the high-side switch FET.
Power
voltage
Input decoupling /filtering is required for proper REG3 operation.
Use a 10uf decoupling capacitor for better performance.
12
13
14
A/B
A/B
A/B
SW3
VOUT3
FB3
REG3 switching node
The inductor is connected between this pin and the regulated
REG3 output.
Output
Output
Input
REG3 output voltage
return pin
This is the discharge path of REG3 output voltage.
REG3 voltage feedback
input for voltage
Connect the feedback resistor divider to this pin.
regulation/programming
15
16
17
A/B
A/B
A/B
SS
FREQ
FB8
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.
Input
Input
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.
REG8 voltage feedback
input for voltage
Connect the feedback resistor divider to this pin.
regulation/programming
18
19
A/B
A/B
BT8
REG8 bootstrap capacitor Connect a 0.01 F capacitor between this pin and SW8 pin to
Passive
Output
input pin
enhance the gate of the Synchronous Power MOSFET.
VOUT8
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
21
22
A/B
A/B
A/B
SW8
SW1
VG
REG8 switching node
REG1 switching node
The inductor is connected between this pin and the VIN pin.
The inductor is connected between this pin and the VIN Pin.
Output
Output
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(1)
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.
-
Pin 23 is not connected.
B
NC0
BT1
No Connect
Passive
24
25
26
27
28
A/B
REG1 bootstrap capacitor Connect a 1.0 F capacitor between this pin and SW1 pin to
input pin
enhance the gate of the Switch Power MOSFET.
A/B
A/B
A/B
A
SCL
SDA
I2C serial interface clock
input
I2C serial interface clock input.
Input/Output
Input/Output
Open Drain
Passive
I2C serial interface data
input
I2C serial interface data input.
RST
Power reset output signal This is an open drain output and must be pulled up by an
(Microprocessor Reset)
external resistor to a supply voltage like VIN
.
REG7 compensation
network connection
REG7 compensation network connection.
COMP7
B
A
-
Pin 28 is not connected
NC1
No Connect
Output
29
VREF7
REG7 resistor feedback
network reference voltage
Connect this pin to the bottom of the feedback resistor divider.
B
NC2
-
Pin 29 is not connected
No Connect
34704
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Freescale Semiconductor
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