PIN CONNECTIONS
PIN CONNECTIONS
26 25 24 23 22 21 20 19
BOOT1
1
18 BOOT2
PVIN1
2
17
PVIN2
PVIN1
SW1
Transparent
Top View
PVIN2
SW2
SW1
3
PIN 27
16
SW2
PGND1
PGND1
4
15
PGND2
PGND2
VOUT1
5
14 VOUT2
6
7
8
9
10
11 12 13
Figure 3. 34717 Pin Connections
Table 1. 34717 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 12 .
Pin Number
1
2
3
4
5
6
7
8
9, 26
10
11
12
13
Pin Name
BOOT1
PVIN1
SW1
PGND1
VOUT1
INV1
COMP1
VREFIN
NC
PG
SD
COMP2
INV2
Pin Function
Passive
Supply
Output
Ground
Output
Input
Input
Input
None
Output
Input
Input
Input
Formal Name
Bootstrap
Power Input Voltage
Switching Node
Power Ground
Output Voltage
Discharge Path
Error Amplifier
Inverting Input
Buck Convertor
Compensation Input
Reference Voltage
Input
No Connect
Power Good Output
Signal
Shutdown Input
Buck Convertor
Compensation Input
Error Amplifier
Inverting Input
Definition
Channel 1 Bootstrap capacitor input pin
Channel 1 Buck converter power input
Channel 1 Buck converter switching node
Channel 1 Buck converter and discharge MOSFETs power ground
Channel 1 Buck converter output voltage discharge pin
Channel 1 Buck converter error amplifier inverting input
Channel 1 Buck converter external compensation network input
Voltage tracking reference voltage input
No internal connections to this pin. Recommend attaching a 0.1 μF
capacitor from pin 9 to GND.
It is an active low open drain power good status reporting output
Shutdown mode input control pin
Channel 2 Buck converter external compensation network input
Channel 2 Buck converter error amplifier inverting input
34717
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
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