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
30
A
FB7
REG7 voltage feedback
input for voltage
Connect the feedback resistor divider to this pin.
Input
regulation/programming
B
A
AGND1
DRV7
-
Pin 30 is connected to AGND
-
31
32
33
REG7 external Power
MOSFET gate drive
REG7 external Power MOSFET gate drive.
Output
-
Pin 31 is not connected
B
A
NC3
No Connect
Output
REG7 output voltage
return pin.
This is the discharge path of REG7 output voltage.
VOUT7
-
Pin 32 is connected to PGND
B
A
PGND1
FB6
-
REG6 voltage feedback
input for voltage
Connect the feedback resistor divider to this pin.
Input
regulation/programming
-
Pin 33 is connected to AGND
B
A
AGND2
BT6
-
34
REG6 bootstrap capacitor Connect a 0.01 μF capacitor between this pin and SW6 pin to
Passive
input pin.
enhance the gate of the Synchronous Power MOSFET.
-
Pin 34 is not connected
B
A
B
A
NC4
SW6
No Connect
Output
-
35
36
REG6 switching node
-
The inductor is connected between this pin and the VIN pin.
Pin 35 is connected to PGND
PGND2
VOUT6
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.
Output
-
Pin 36 is connected to PGND
Analog ground of the IC.
B
PGND3
AGND
VIN
-
37
38
Analog ground of the IC
A/B
A/B
Ground
Power
Battery voltage
connection
Input decoupling /filtering is required for the device to operate
properly.
39
40
41
42
Internal supply voltage
Connect a 1.0 μF low ESR decoupling filter capacitor between
this pin and GND.
A/B
A/B
A/B
A/B
VDDI
LION
Output
Input
Battery Detection
Always pull this pin High with a 470kohm Resistor to indicate
Input power is present.
Dual function IC turn On/ This is a hardware enable/disable for the 34704A/B. It can be
Off
ONOFF
BT2U
Input
connected to a mechanical switch to turn the power On or Off.
REG2 Boost Stage
Connect a 1.0 μF capacitor between this pin and SW2U pin to
Passive
bootstrap capacitor input enhance the gate of the Switch Power MOSFET.
pin
43
44
REG2 compensation
network connection
REG2 compensation network connection.
A/B
A/B
COMP2
FB2
Passive
Input
REG2 voltage feedback
input for voltage
Connect the feedback resistor divider to this pin.
regulation/programming
45
46
REG2 Buck Stage
Connect a 1.0 μF capacitor between this pin and SW2D pin to
A/B
A/B
BT2D
Passive
Power
bootstrap capacitor input enhance the gate of the Switch Power MOSFET.
pin
REG2 power supply input This is the connection to the drain of the high side switch FET.
PVIN2
voltage
Input decoupling /filtering is required for proper REG2 operation.
Use a 10uf decoupling capacitor for better performance
34704
Analog Integrated Circuit Device Data
Freescale Semiconductor
6
FREESCALE [ Freescale ]
