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PIN CONNECTIONS
PIN CONNECTIONS
GND
FREQ
1
2
24
23
22
21
20
19
18
17
PVIN
SW
ILIM
3
Transparent
16
SW
Top View
PG
NC
SD
4
5
6
PIN 25
15
14
13
SW
PGND
PGND
7
8
9
10
11
12
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 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, 8
6
7
9
10
11
12,13,14
15,16,17
18,19,20
21
22,23
24
ILIM
PG
NC
SD
VREFIN
COMP
INV
VOUT
PGND
SW
PVIN
BOOT
VIN
VDDI
Input
Output
None
Input
Input
Passive
Input
Output
Ground
Output
Supply
Passive
Supply
Passive
Soft Start
Power Good
No Connect
Shutdown
Voltage Tracking
Reference Input
Compensation
Error Amplifier
Inverting Input
Output Voltage
Discharge FET
Power Ground
Switching Node
Power-Circuit Supply
Input
Bootstrap
Logic-Circuit Supply
Input
Internal Voltage
Regulator
Soft Start adjustment
Active-low (open drain) power-good status reporting pin
No internal connections to these pins. Recommend attaching a 0.1 μF
capacitor from pin 8 to GND.
Shutdown mode input control pin
Voltage Tracking Reference voltage input
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)
Logic circuits supply voltage input
Internal Vdd Regulator (connect filter capacitor to this pin)
34713
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
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