MC34700EPR2 查看數據表（PDF） - Freescale Semiconductor
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MC34700EPR2 Datasheet PDF : 28 Pages
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PIN CONNECTIONS
FUNCTIONAL PIN DESCRIPTIONS
PIN CONNECTIONS
32 31 30 29 28 27 26 25
VIN1 1
SW1 2
SW1 3
BST1 4
GND2 5
SW2 6
VIN2 7
BST2 8
TRANSPARENT
TOP VIEW
PIN 33
24 VIN
23 LDO_VIN
22 LDO
21 LDO_FB
20 GND3
19 SW3
18 VIN3
17 BST3
9 10 11 12 13 14 15 16
Table 3. 34700 Pin Definitions
Figure 3. 34700 Pin Connections
FUNCTIONAL PIN DESCRIPTIONS
Pin Name
Pin Description
1,32 VIN1 Buck regulator #1’s power input voltage. VIN1 is connected to the drain of the DC/DC #1’s high side MOSFET. Local
bypass capacitors are recommended.
2,3
SW1 Buck regulator #1’s switching node. SW1 is connected to the source of the high side MOSFET. Connect this pin to the
cathode of the catch diode and the output inductor.
4
BST1 Buck regulator #1’s bootstrap capacitor input. Connect a capacitor between the BST1 and SW1 pin of DC/DC #1 to
enhance the gate of the high side MOSFET during switching.
5
GND2 Buck regulator #2’s power ground. GND2 is connected to the source of DC/DC #2’s low side MOSFET. Connect this pin
to the DC/DC #2’s power return path.
6
SW2 Buck regulator #2’s switching node. SW2 is connected to source of the high side and the drain of the low side MOSFET.
Connect this pin to the output inductor.
7
VIN2 Buck regulator #2’s power input voltage. VIN2 is connected to the drain of the DC/DC #2’s high side MOSFET. Local
bypass capacitors are recommended.
8
BST2 Buck regulator #2’s bootstrap capacitor input. Connect a capacitor between the BST2 and SW2 pin of DC/DC #2 to
enhance the gate of the high side MOSFET during switching.
9 COMP2 Buck regulator #2’s compensation output. COMP2 is connected to DC/DC #2’s error amplifier’s output. Connect the
required external compensation network between the COMP2 pin and the FB2 pin.
10
FB2 DC/DC #2’s error amplifier inverting input. Connect the required compensation network and feedback network to this
terminal as appropriate.
11
EN1 This input enables buck regulator #1. Asserting EN1 high turns on DC/DC #1. The internal control logic remains active
as long as VIN is present.
12
EN2 This input enables buck regulator #2. Asserting EN2 high turns on DC/DC #2. The internal control logic remains active
as long as VIN is present.
34700
8
Analog Integrated Circuit Device Data
Freescale Semiconductor
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