LM3814 Datasheet, PDF (3/14 Pages) National Semiconductor (TI) – Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Absolute Maximum Supply Voltage
Power Dissipation
ESD Susceptibility (Note 3)
Sense Current (peak, for 200 msec) (Note 4)
Sink Current for PWM pin
Voltage on Pin 5
5.5V
(Note 2)
1.5 kV
10A
1 mA
5.25V
Maximum Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
150˚C
−65˚C to +150˚C
260˚C
Operating Ratings (Note 1)
Input Voltage
Sense Current (continuous) (Note 4)
Junction Temperature Range
2.0V to 5.25V
7A
−40˚C to +125˚C
Electrical Characteristics
LM3814-1.0, LM3815-1.0
V_DD = 5.0V for the following specifications. Supply bypass capacitor is 1µF and filter capacitor is 0.1µF.
Symbol
Parameter
Conditions
Typ
(Note 5)
Limit
(Note 6)
I_ACC
Average Current Accuracy
(Note 7)
at 0.9A current
0.9
0.868 / 0.850
0.932 / 0.950
e_n
Effective Output Noise (rms)
12
Units
A
A (min)
A (max)
mA
LM3814-7.0, LM3815-7.0
V_DD = 5.0V for the following specifications. Supply bypass capacitor is 1µF and filter capacitor is 0.1µF.
Symbol
Parameter
Conditions
Typ
(Note 5)
Limit
(Note 6)
I_ACC
Average Current Accuracy
(Note 7)
at 2.5A current (Note 8)
2.5
2.350 / 2.288
2.650 / 2.712
e_n
Effective Output Noise (rms)
120
Units
A
A (min)
A (max)
mA
Common Device Parameters
Unless otherwise specified, V_DD = 5.0V for the following specifications. Supply bypass capacitor is 1µF and filter capacitor is
0.1µF.
Symbol
Parameter
Conditions
Typ
(Note 5)
Limit
(Note 6)
Units
I_Q1
Quiescent Current
Normal Mode, SD = high
100
µA
160
µA (max)
I_Q2
Quiescent Current
Shutdown Mode, SD = low
2.5
µA
10
µA (max)
D_RES
t_S
PWM Resolution
Sampling Time
0.8
%
6
ms
4
ms (min)
10
ms (max)
f_P
Frequency of PWM Waveform
160
Hz
100
Hz (min)
250
Hz (max)
V_TH
Threshold High Level for SD
1.2
V
1.8
V (min)
V_TL
Threshold Low Level for SD
1.3
V
0.7
V (max)
3
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