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MC34712 数据表(PDF) 3 Page - Freescale Semiconductor, Inc

部件名 MC34712
功能描述  3.0 A 1.0 MHz Fully Integrated DDR Switch-Mode Power Supply
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制造商  FREESCALE [Freescale Semiconductor, Inc]
网页  http://www.freescale.com
标志 FREESCALE - Freescale Semiconductor, Inc

MC34712 数据表(HTML) 3 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
3
34712
PIN CONNECTIONS
PIN CONNECTIONS
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
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
NC
None
No Connect
No internal connections to this pin
4
PG
Output
Power Good
Active-low (open drain) power-good status reporting pin
5
STBY
Input
Standby
Standby mode input control pin
6
SD
Input
Shutdown
Shutdown mode input control pin
7
VREFIN
Input
Voltage Tracking
Reference Input
Voltage tracking reference voltage input
8
VREFOUT
Output
Reference Voltage
Output
Buffered output equal to 1/2 of voltage-tracking reference
9
COMP
Passive
Compensation
Buck converter external compensation network pin
10
INV
Input
Error Amplifier
Inverting Input
Buck converter error amplifier inverting input pin
11
VOUT
Output
Output Voltage
Discharge FET
Discharge FET drain connection (connect to buck converter output
capacitors)
12,13,14
PGND
Ground
Power Ground
Ground return for buck converter and discharge FET
15,16,17
SW
Output
Switching Node
Buck converter power switching node
18,19,20
PVIN
Supply
Power-circuit Supply
Input
Buck converter main supply voltage input
21
BOOT
Passive
Bootstrap
Bootstrap switching node (connect to bootstrap capacitor)
GND
FREQ
STBY
PG
NC
SD
SW
PGND
PGND
SW
SW
PVIN
Transparent
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Top View
PIN 25


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