
PIN CONNECTIONS
PIN CONNECTIONS
24
23
22
21
20
19
GND
1
18 PVIN
FREQ
2
17
SW
NC
PG
3
4
Transparent
Top View
PIN 25
16
15
SW
SW
STBY
5
14 PGND
SD
6
13
PGND
7
8
9
10
11
12
Figure 3. 34712 Pin Connections
Table 1. 34712 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 10 .
Pin Number
1
Pin Name
GND
Pin Function
Ground
Formal Name
Signal Ground
Analog signal ground of IC
Definition
2
FREQ
Passive
Frequency Adjustment Buck converter switching frequency adjustment pin
3
4
5
6
7
8
9
10
11
12,13,14
15,16,17
18,19,20
21
NC
PG
STBY
SD
VREFIN
VREFOUT
COMP
INV
VOUT
PGND
SW
PVIN
BOOT
None
Output
Input
Input
Input
Output
Passive
Input
Output
Ground
Output
Supply
Passive
No Connect
Power Good
Standby
Shutdown
Voltage Tracking
Reference Input
Reference Voltage
Output
Compensation
Error Amplifier
Inverting Input
Output Voltage
Discharge FET
Power Ground
Switching Node
Power-circuit Supply
Input
Bootstrap
No internal connections to this pin
Active-low (open drain) power-good status reporting pin
Standby mode input control pin
Shutdown mode input control pin
Voltage tracking reference voltage input
Buffered output equal to 1/2 of voltage-tracking reference
Buck converter external compensation network pin
Buck converter error amplifier inverting input pin
Discharge FET drain connection (connect to buck converter output
capacitors)
Ground return for buck converter and discharge FET
Buck converter power switching node
Buck converter main supply voltage input
Bootstrap switching node (connect to bootstrap capacitor)
34712
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
3