PIN CONNECTIONS
PIN CONNECTIONS
20 19
22 21
24
23
GND
FREQ
ILIM
1
PVIN
18
17
16
2
3
SW
SW
Transparent
Top View
4
15 SW
PG
NC
14
13
PGND
PGND
5
6
SD
12
8
9
10
11
7
Figure 3. 34713 Pin Connections
Table 1. 34713 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 9.
Pin Number Pin Name Pin Function
Formal Name
Definition
Analog signal ground of IC
1
2
3
4
GND
FREQ
ILIM
Ground
Passive
Input
Signal Ground
Frequency Adjustment
Soft Start
Buck converter switching frequency adjustment pin
Soft Start adjustment
Active-low (open drain) power-good status reporting pin
PG
Output
Power Good
No internal connections to these pins. Recommend attaching a 0.1µF
capacitor from pin 8 to GND.
5, 8
6
None
Input
No Connect
Shutdown
NC
Shutdown mode input control pin
SD
VREFIN
COMP
INV
Voltage-Tracking-
Reference Input
Voltage-Tracking-Reference voltage input
7
Input
Buck converter external compensation network pin
Buck converter error amplifier inverting input pin
9
Passive
Input
Compensation
Error Amplifier
Inverting Input
10
Discharge FET drain connection (connect to buck converter output
capacitors)
Output Voltage
Discharge FET
11
VOUT
Output
Ground return for buck converter and discharge FET
Buck converter power switching node
12,13,14
15,16,17
PGND
SW
Ground
Power
Power Ground
Switching Node
Power-Circuit Supply Buck converter main supply voltage input
Input
18,19,20
21
PVIN
BOOT
VIN
Supply
Passive
Supply
Bootstrap switching node (connect to bootstrap capacitor)
Bootstrap
Logic-Circuit Supply
Input
Logic circuits supply voltage input
22,23
Internal Voltage
Regulator
Internal Vdd Regulator (connect filter capacitor to this pin)
24
VDDI
Passive
34713
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
FREESCALE [ Freescale ]
