Connection Diagram
Top View
20034609
8 Lead Plastic MSOP-8
NS package Number MUA08A
Package Marking and Ordering Information
Order Number
Package Type
Package Marking
Supplied As:
LM3485MM
MSOP-8
S29B
1000 units on Tape and Reel
3500 units on Tape and Reel
LM3485MMX
MSOP-8
S29B
Pin Description
Pin Name
Pin Number
Description
ISENSE
1
The current sense input pin. This pin should be connected to Drain
node of the external PFET.
GND
NC
2
3
4
Signal ground.
No connection.
FB
The feedback input. Connect the FB to a resistor voltage divider
between the output and GND for an adjustable output voltage.
Current limit threshold adjustment. It connects to an internal 5.5µA
current source. A resistor is connected between this pin and the
input Power Supply. The voltage across this resistor is compared
with the VDS of the external PFET to determine if an over-current
condition has occurred.
ADJ
5
PWR GND
PGATE
6
7
Power ground.
Gate Drive output for the external PFET. PGATE swings between
VIN and VIN-5V.
VIN
8
Power supply input pin.
www.national.com
2
NSC [ National Semiconductor ]
