MC34704 FREESCALE [Freescale Semiconductor, Inc], MC34704 Datasheet - Page 6

• Manufacturer Part Number: MC34704
• Description: Multiple Channel DC-DC Power Management IC
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Table 2. 34704 Pin Definitions (continued)
6
34704
PIN CONNECTIONS
Pin Number Device Pin Name Pin Function
A functional description of each pin can be found in the Functional Pin Description section beginning on
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
A/B
A/B
A/B
A/B
A/B
A/B
A/B
A/B
A/B
A
B
A
B
A
B
A
B
A
B
A
B
B
A
B
AGND1
PGND1
AGND2
PGND2
PGND3
ONOFF
COMP2
VOUT7
VOUT6
AGND
DRV7
BT2U
BT2D
VDDI
LION
SW6
NC3
NC4
FB7
FB6
BT6
FB2
VIN
No Connect
No Connect
Passive
Passive
Passive
Passive
Ground
Output
Output
Output
Output
Output
Power
Input
Input
Input
Input
Input
-
-
-
-
-
-
REG7 voltage feedback
input for voltage
regulation/programming
-
REG7 external Power
MOSFET gate drive
-
REG7 output voltage
return pin.
-
REG6 voltage feedback
input for voltage
regulation/programming
-
REG6 bootstrap capacitor
input pin.
-
REG6 switching node
-
REG6 regulated output
voltage pin
-
Analog ground of the IC
Battery voltage
connection
Internal supply voltage
Battery Detection
Dual function IC turn On/
Off
REG2 Boost Stage
bootstrap capacitor input
pin
REG2 compensation
network connection
REG2 voltage feedback
input for voltage
regulation/programming
REG2 Buck Stage
bootstrap capacitor input
pin
Formal Name
Connect the feedback resistor divider to this pin.
Pin 30 is connected to AGND
REG7 external Power MOSFET gate drive.
Pin 31 is not connected
This is the discharge path of REG7 output voltage.
Pin 32 is connected to PGND
Connect the feedback resistor divider to this pin.
Pin 33 is connected to AGND
Connect a 0.01 F capacitor between this pin and SW6 pin to
enhance the gate of the Synchronous Power MOSFET.
Pin 34 is not connected
The inductor is connected between this pin and the VIN pin.
Pin 35 is connected to PGND
Connect this pin directly to the load directly and to the output
filter as close to the pin as possible.
Pin 36 is connected to PGND
Analog ground of the IC.
Input decoupling /filtering is required for the device to operate
properly.
Connect a 1 F low ESR decoupling filter capacitor between this
pin and GND.
Pull this pin high to VIN to indicate a connection to a Li-Ion
battery
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.
Connect a 1 F capacitor between this pin and SW2U pin to
enhance the gate of the Switch Power MOSFET.
REG2 compensation network connection.
Connect the feedback resistor divider to this pin.
Connect a 1 F capacitor between this pin and SW2D pin to
enhance the gate of the Switch Power MOSFET.
Analog Integrated Circuit Device Data
Definition
Freescale Semiconductor
page
17.