LM3814_05 Datasheet, PDF (2/14 Pages) National Semiconductor (TI) – Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output

Ordering Information
Order No.^#
LM3814M-1.0
LM3814MX-1.0
LM3814M-7.0
LM3814MX-7.0
LM3815M-1.0
LM3815MX-1.0
LM3815M-7.0
LM3815MX-7.0
Sense
Range
Sampling
Interval*
Sensing
Method
±1A
6 ms
High-side
±1A
6 ms
High-side
±7A
6 ms
High-side
±7A
6 ms
High-side
±1A
6 ms
Low-side
±1A
6 ms
Low-side
±7A
6 ms
Low-side
±7A
6 ms
Low-side
NS
Package
Number^‡
M08A
M08A
M08A
M08A
M08A
M08A
M08A
M08A
Package
Type
Supplied As:
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
# _{Suffix M indicates that the part is available in Surface}
Mount package. Suffix X indicates that the part is available in
2.5k units on Tape and Reel.
* Current is sampled over a fixed interval. The average
current during this interval is indicated by the duty cycle of
the PWM output during next interval.
Pin Description (High-Side, LM3814)
‡ _{The Package code M08A is internal to National Semicon-}
ductor and indicates an 8-lead surface mount package,
SO-8.
Pin
Name
1
SENSE+, V_DD
2
SENSE−
3
FLTR+
4
FLTR−
5
SD
6
PWM
7
GND
8
GND
Pin Description (High-Side, LM3814)
Function
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_DD through a pull up resistor for normal operation. When
low, the IC goes into a low current mode (typically 3 µA).
PWM output indicates the current magnitude and direction.
Ground
Ground
Pin Description (Low-Side, LM3815)
Pin
Name
1
SENSE+, GND
2
SENSE−
3
FLTR+
4
FLTR−
5
SD
6
PWM
7
GND
8
V_DD
Pin Description (Low-Side, LM3815)
Function
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_DD through a pull up resistor for normal operation. 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)
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