34704_09 Datasheet, PDF (4/49 Pages) Freescale Semiconductor, Inc – Multiple Channel DC-DC Power Management IC

PIN CONNECTIONS
PIN CONNECTIONS
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
41
3
57
40
4
39
5
38
6
37
Exposed Pad
7
PGND
36
8
35
9
34
10
33
11
32
12
31
13
30
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
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
41
3
57
40
4
39
5
38
6
37
Exposed Pad
7
PGND
36
8
35
9
34
10
33
11
32
12
31
13
30
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
BT2U
ONOFF
LION
VDDI
VIN
AGND
PGND5
PGND4
NC4
AGND3
PGND2
NC3
AGND1
NC2
34704A
Figure 3. 34704 Pin Connections
34704B
Table 2. 34704 Pin Definitions
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
1
A/B BT5U
Passive ^{REG5 Boost Stage}
Connect a 1μF capacitor between this pin and SW5U pin to
bootstrap capacitor input enhance the gate of the Switch Power MOSFET.
pin
2
A/B BT4D
Passive ^{REG4 Buck Stage}
Connect a 0.01μF capacitor between this pin and SW4D pin to
bootstrap capacitor input enhance the gate of the Switch Power MOSFET.
pin
3
A/B PVIN4
Power
REG4 power supply input This is the connection to the drain of the high side switch FET.
voltage
Input decoupling /filtering is required for proper REG4 operation.
4
A/B SW4D Input/Output REG4 Buck Stage
switching node
The inductor is connected between this pin and the SW4U pin.
5
A/B VOUT4
Output
REG4 regulated output Connect this pin to the load and to the output filter as close to
voltage pin
the pin as possible.
6
A/B SW4U _Input/Output REG4 Boost Stage
The inductor is connected between this pin and the SW4D pin.
switching node
7
A/B BT4U
Passive REG4 Boost Stage
Connect a 0.01μF capacitor between this pin and SW4U pin to
bootstrap capacitor input enhance the gate of the Switch Power MOSFET.
pin
8
A/B
FB4
Input
REG4 voltage feedback Connect the feedback resistor divider to this pin.
input for voltage
regulation/programming
9
A/B COMP4 _Passive REG4 compensation
REG4 compensation network connection.
network connection
10
A/B
BT3
Passive ^{REG3 bootstrap capacitor Connect a 0.01μF capacitor between this pin and SW3 pin to}
input pin
enhance the gate of the Switch Power MOSFET.
34704
4
Analog Integrated Circuit Device Data
Freescale Semiconductor