LM3489QMM National Semiconductor, LM3489QMM Datasheet - Page 2

• Manufacturer Part Number: LM3489QMM
• Description: LM3489/LM3489Q Hysteretic PFET Buck Controller with Enable Pin; Package: MINI SOIC; No of Pins: 8; Qty per Container: 1000; Container: Reel
• Manufacturer: National Semiconductor

www.national.com
Connection Diagram
Package Marking and Ordering Information
*Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies.
Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products are identified
with the letter Q. For more information go to http://www.national.com/automotive.
Pin Descriptions
Order Number
LM3489QMMX
LM3489MMX
LM3489QMM
LM3489MM
Pin #
1
2
3
4
5
6
7
8
ISENSE
PGATE
PGND
Name
Package Type
GND
ADJ
VIN
EN
FB
MSOP-8
MSOP-8
MSOP-8
MSOP-8
The current sense input pin. This pin should be connected to the PFET drain terminal
directly or through a series resistor up to 600 ohm for 28V>Vin>35V.
Signal ground.
Enable pin. Connect EN pin to ground to shutdown the part or float to enable operation
(Internally pulled high). This pin can also be used to perform UVLO function.
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. Connected to an internal 5.5µA current source. A
resistor is connected between this pin and VIN. The voltage across this resistor is
compared with the ISENSE pin voltage to determine if an over-current condition has
occurred.
Power ground.
Gate Drive output for the external PFET. PGATE swings between VIN and VIN-5V.
Power supply input pin.
Package Marking
NS package Number MUA08A
8 Lead Plastic MSOP-8
SKSB
SKSB
STEB
STEB
Top View
2
1000 units on Tape and Reel
3500 units on Tape and Reel
1000 units on Tape and Reel
3000 units on Tape and Reel
20186909
Supplied As:
Description
Automotive Grade*
Grade 1
Grade 1
No
No