LM3481MMX National Semiconductor, LM3481MMX Datasheet - Page 2

• Manufacturer Part Number: LM3481MMX
• Description: High Efficiency Low-Side N-Channel Controller for Switching Regulators
• Manufacturer: National Semiconductor

www.national.com
Connection Diagram
Package Marking and Ordering Information
Pin Description
FA/SYNC/SD
Pin Name
Order Number
LM3481MMX
COMP
LM3481MM
AGND
PGND
UVLO
I
V
DR
V
SEN
FB
CC
IN
Pin Number
10
1
2
3
4
5
6
7
8
9
10-Lead Mini SOIC Package (MSOP-10 Package)
Package Type
MSOP-10
MSOP-10
Current sense input pin. Voltage generated across an external sense
resistor is fed into this pin.
Under voltage lockout pin. A resistor divider from V
connected to the UVLO pin. The ratio of these resistances determine
the input voltage which allows switching and the hysteresis to disable
switching.
Compensation pin. A resistor and capacitor combination connected to
this pin provides compensation for the control loop.
Feedback pin. Inverting input of the error amplifier.
Analog ground pin. Internal bias circuitry reference. Should be
connected to PGND at a single point.
Frequency adjust, synchronization, and shutdown pin. A resistor
connected from this pin to ground sets the oscillator frequency. An
external clock signal at this pin will synchronize the controller to the
frequency of the clock. A high level on this pin for
device off and the device will then draw 5 µA from the supply typically.
Power ground pin. External power circuitry reference. Should be
connected to AGND at a single point.
Drive pin of the IC. The gate of the external MOSFET should be
connected to this pin.
Driver supply voltage pin. Typically a capacitor is tied from the V
to ground.
Power supply input pin.
Package Marking
2
SJPB
SJPB
Description
20136502
1000 units on Tape and Reel
3500 units on Tape and Reel
Supplied As:
≥
IN
30 µs will turn the
to ground is
CC
pin