PIN CONNECTIONS
PIN CONNECTIONS
COMP5
COMP5
COMP2
COMP2
VOUT5
VOUT2
VOUT5
VOUT2
SW5D
SW5U
SW2U
SW2D
PVIN5
PVIN5
PVIN2
SW5D
SW5U
SW2U
SW2D
PVIN2
BT5D
BT5D
BT2D
BT2D
FB5
FB5
FB2
BT5U
BT4D
PVIN4
SW4D
VOUT4
SW4U
BT4U
FB4
COMP4
BT3
PVIN3
SW3
VOUT3
FB3
56 55 54 53 52 51 50 49 48 47 46 45 44 43
1
42
2
3
4
5
6
7
8
9
10
11
12
13
Exposed Pad
PGND
57
41
40
39
38
37
36
35
34
33
32
31
30
BT2U
ONOFF
LION
VDDI
VIN
AGND
VOUT6
SW6
BT6
FB6
VOUT7
DRV7
FB7
VREF7
BT5U
BT4D
PVIN4
SW4D
VOUT4
SW4U
BT4U
FB4
COMP4
BT3
PVIN3
SW3
VOUT3
FB3
56 55 54 53 52 51 50 49 48 47 46 45 44 43
1
42
2
3
4
5
6
7
8
9
10
11
12
13
Exposed Pad
PGND
57
41
40
39
38
37
36
35
34
33
32
31
30
FB2
BT2U
ONOFF
LION
VDDI
VIN
AGND
PGND5
PGND4
NC4
AGND3
PGND2
NC3
AGND1
NC2
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
SS
FREQ
VOUT8
VOUT1
SW8
SW1
SDA
FB8
BT8
VG
BT1
SCL
COMP7
RST
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
SS
FREQ
VOUT8
SW8
SW1
SDA
FB8
BT8
VG
BT1
SCL
NC0
RST
NC1
34704A
Figure 3. 34704 Pin Connections
Table 2. 34704 Pin Definitions
34704B
A functional description of each pin can be found in the Functional Pin Description section beginning on
Pin Number Device Pin Name Pin Function
1
A/B
BT5U
Passive
Formal Name
REG5 Boost Stage
bootstrap capacitor input
pin
REG4 Buck Stage
bootstrap capacitor input
pin
REG4 power supply input
voltage
REG4 Buck Stage
switching node
REG4 regulated output
voltage pin
REG4 Boost Stage
switching node
REG4 Boost Stage
bootstrap capacitor input
pin
REG4 voltage feedback
input for voltage
regulation/programming
REG4 compensation
network connection
REG3 bootstrap capacitor
input pin
Definition
Connect a 1μF capacitor between this pin and SW5U pin to
enhance the gate of the Switch Power MOSFET.
Connect a 0.01μF capacitor between this pin and SW4D pin to
enhance the gate of the Switch Power MOSFET.
This is the connection to the drain of the high side switch FET.
Input decoupling /filtering is required for proper REG4 operation.
The inductor is connected between this pin and the SW4U pin.
Connect this pin to the load and to the output filter as close to
the pin as possible.
The inductor is connected between this pin and the SW4D pin.
Connect a 0.01μF capacitor between this pin and SW4U pin to
enhance the gate of the Switch Power MOSFET.
Connect the feedback resistor divider to this pin.
2
A/B
BT4D
Passive
3
4
5
6
7
A/B
A/B
A/B
A/B
A/B
PVIN4
SW4D
VOUT4
SW4U
BT4U
Power
Input/Output
Output
Input/Output
Passive
8
A/B
FB4
Input
9
10
A/B
A/B
COMP4
BT3
Passive
Passive
REG4 compensation network connection.
Connect a 0.01μF capacitor between this pin and SW3 pin to
enhance the gate of the Switch Power MOSFET.
34704
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
