LM3812M-1.0 National Semiconductor, LM3812M-1.0 Datasheet - Page 2

• Manufacturer Part Number: LM3812M-1.0
• Description: Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
• Manufacturer: National Semiconductor

www.national.com
Ordering Information
#
on Tape and Reel.
during next interval.
Pin Description (High-Side, LM3812)
Pin Description (Low-Side, LM3813)
*
‡
LM3812M-1.0
LM3812MX-1.0
LM3812M-7.0
LM3812MX-7.0
LM3813M-1.0
LM3813MX-1.0
LM3813M-7.0
LM3813MX-7.0
Pin
Pin
The Package code M08A is internal to National Semiconductor and indicates an 8-lead surface mount package, SO-8.
Suffix M indicates that the part is available in Surface Mount package. Suffix X indicates that the part is available in 2.5k units
Current is sampled over a fixed interval. The average current during this interval is indicated by the duty cycle of the PWM output
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Order No.
SENSE+, V
SENSE−
FLTR+
FLTR−
SD
PWM
GND
GND
SENSE+, GND
SENSE−
FLTR+
FLTR−
SD
PWM
GND
V
DD
#
Name
Name
DD
Range
Sense
±
±
±
±
±
±
±
±
1A
1A
7A
7A
1A
1A
7A
7A
Sampling
Interval
50 ms
50 ms
50 ms
50 ms
50 ms
50 ms
50 ms
50 ms
High side of internal current sense, also supply voltage.
Low side of internal current sense.
Filter input — provides anti-aliasing for delta sigma modulator.
Filter input.
Shutdown pin. Connected to V
When low, the IC goes into a low current mode (typically 3 µA).
PWM output indicates the current magnitude and direction.
Ground
Ground
High side of internal current sense, also ground.
Low side of internal current sense.
Filter input – provides anti-aliasing for delta sigma modulator.
Filter input.
Shutdown pin. Connected to V
When low, the IC goes into a low current mode (typically 3 µA).
PWM output indicates the current magnitude and direction.
Ground
V
DD
*
(supply)
High-side
High-side
High-side
High-side
Low-side
Low-side
Low-side
Low-side
Sensing
Method
2
Package
Number
M08A
M08A
M08A
M08A
M08A
M08A
M08A
M08A
NS
DD
DD
‡
through a pull up resistor for normal operation.
through a pull up resistor for normal operation.
Package
Function
Function
Type
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
95 units in Rails
2.5k units on Tape and Reel
95 units in Rails
2.5k units on Tape and Reel
95 units in Rails
2.5k units on Tape and Reel
95 units in Rails
2.5k units on Tape and Reel
Supplied As: