34704_11 Datasheet, PDF (6/54 Pages) Freescale Semiconductor, Inc – Multiple Channel DC-DC Power Management IC

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