MC34717 데이터 시트보기 (PDF) - Freescale Semiconductor
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MC34717 Datasheet PDF : 28 Pages
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PIN CONNECTIONS
PIN CONNECTIONS
26 25 24 23 22 21 20 19
BOOT1 1
18 BOOT2
PVIN1
2
PVIN1
SW1
3
SW1
PGND1
4
PGND1
VOUT1 5
Transparent
Top View
PIN 27
PVIN2
17
PVIN2
SW2
16
SW2
PGND2
15
PGND2
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 Pin Name Pin Function Formal Name
Definition
1
2
3
4
5
6
7
8
9, 26
BOOT1
PVIN1
SW1
PGND1
VOUT1
INV1
COMP1
VREFIN
NC
Passive
Supply
Output
Ground
Output
Input
Input
Input
None
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
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.
10
PG
Output
Power Good Output It is an active low open drain power good status reporting output
Signal
11
SD
Input
Shutdown Input Shutdown mode input control pin
12
COMP2
Input
Buck Convertor Channel 2 Buck converter external compensation network input
Compensation Input
13
INV2
Input
Error Amplifier
Inverting Input
Channel 2 Buck converter error amplifier inverting input
Analog Integrated Circuit Device Data
Freescale Semiconductor
34717
3
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