MC34713 查看數據表（PDF） - Freescale Semiconductor
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MC34713 Datasheet PDF : 21 Pages
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PIN CONNECTIONS
PIN CONNECTIONS
24 23 22 21 20 19
GND 1
18 PVIN
FREQ 2
ILIM 3
PG 4
Transparent
Top View
17 SW
16 SW
15 SW
NC 5
SD 6
14 PGND
13 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 9.
Pin Number Pin Name Pin Function Formal Name
Definition
1
GND
Ground
Signal Ground
Analog signal ground of IC
2
FREQ
Passive Frequency Adjustment Buck converter switching frequency adjustment pin
3
ILIM
Input
Soft Start
Soft Start adjustment
4
PG
Output
Power Good
Active-low (open drain) power-good status reporting pin
No internal connections to these pins. Recommend attaching a 0.1µF
5, 8
NC
None
No Connect
capacitor from pin 8 to GND.
6
7
9
10
11
12,13,14
15,16,17
18,19,20
21
22,23
24
SD
VREFIN
COMP
INV
VOUT
PGND
SW
PVIN
BOOT
VIN
VDDI
Input
Input
Passive
Input
Output
Ground
Power
Supply
Passive
Supply
Passive
Shutdown
Shutdown mode input control pin
Voltage-Tracking-
Reference Input
Voltage-Tracking-Reference voltage input
Compensation
Buck converter external compensation network pin
Error Amplifier
Inverting Input
Buck converter error amplifier inverting input pin
Output Voltage
Discharge FET
Discharge FET drain connection (connect to buck converter output
capacitors)
Power Ground
Ground return for buck converter and discharge FET
Switching Node Buck converter power switching node
Power-Circuit Supply Buck converter main supply voltage input
Input
Bootstrap
Bootstrap switching node (connect to bootstrap capacitor)
Logic-Circuit Supply Logic circuits supply voltage input
Input
Internal Voltage
Regulator
Internal Vdd Regulator (connect filter capacitor to this pin)
34713
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
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