LM2717_08 NSC [National Semiconductor], LM2717_08 Datasheet - Page 3

• Manufacturer Part Number: LM2717_08
• Description: Dual Step-Down DC/DC Converter
• Manufacturer: NSC [National Semiconductor]

Pin Descriptions
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
SHDN2
SHDN1
FSLCT
PGND
PGND
AGND
AGND
AGND
PGND
PGND
Name
SW2
SW1
CB2
CB1
FB1
FB2
SS2
SS1
V
V
V
V
V
V
BG
C1
C2
IN
IN
IN
Power ground. PGND and AGND pins must be connected together directly at the part.
Power ground. PGND and AGND pins must be connected together directly at the part.
Analog ground. PGND and AGND pins must be connected together directly at the part.
Fixed buck output voltage feedback input.
Fixed buck compensation network connection. Connected to the output of the voltage error
amplifier.
Bandgap connection.
Adjustable buck compensation network connection. Connected to the output of the voltage error
amplifier.
Adjustable buck output voltage feedback input.
Analog ground. PGND and AGND pins must be connected together directly at the part.
Analog ground. PGND and AGND pins must be connected together directly at the part.
Power ground. PGND and AGND pins must be connected together directly at the part.
Power ground. PGND and AGND pins must be connected together directly at the part.
Adjustable buck power switch input. Switch connected between V
Analog power input. V
Analog power input. V
Adjustable buck converter bootstrap capacitor connection.
Shutdown pin for adjustable buck converter. Active low.
Adjustable buck soft start pin.
Switching frequency select input. Use a resistor to set the frequency anywhere between 300kHz
and 600kHz.
Fixed buck soft start pin.
Shutdown pin for fixed buck converter. Active low.
Fixed buck converter bootstrap capacitor connection.
Analog power input. V
Fixed buck power switch input. Switch connected between V
IN
IN
IN
pins should be connected together directly at the part.
pins should be connected together directly at the part.
pins should be connected together directly at the part.
3
Function
IN
pins and SW1 pin.
IN
pins and SW2 pin.
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