LM4040/4041
Micrel
LM4040 and LM4041 Electrical Characteristic Notes
Note 1.
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the
device is functional, but do not guarantee specific performance limits. For guaranteed specification and test conditions, see the Electrical
Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when
the device is not operated under the listed test conditions.
The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
(maximum junction temperature),
θ
JA
(junction to ambient thermal resistance), and T
A
(ambient temperature). The maximum allowable power dissipation at any temperature is
PD
MAX
= (T
JMAX
– T
A
)/θ
JA
or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4040 and LM4041,
T
JMAX
= 125°C, and the typical thermal resistance (θ
JA
), when board mounted, is 326°C/W for the SOT-23 package.
The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor
discharged directly into each pin.
Typicals are at T
J
= 25°C and represent most likely parametric norm.
Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQL)
methods.
The boldface (over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown
Voltage Tolerance
±[(∆V
R
/∆T)(65°C)(V
R
)].
∆V
R
/∆T is the V
R
temperature coefficient, 65°C is the temperature range from –40°C to the
reference point of 25°C, and V
R
is the reverse breakdown voltage. The total over temperature tolerance for the different grades follows:
A-grade:
±0.75%
=
±0.1% ±100ppm/°C ×
65°C
B-grade:
±0.85%
=
±0.2% ±100ppm/°C ×
65°C
C-grade:
±1.15%
=
±0.5% ±100ppm/°C ×
65°C
D-grade:
±1.98%
=
±1.0% ±150ppm/°C ×
65°C
Example: The A-grade LM4040-2.5 has an over temperature Reverse Breakdown Voltage tolerance of
±2.5 ×
0.75% =
±19mV.
Note 7.
Note 8.
When V
OUT
≤
1.6V, the LM4041-ADJ must operate at reduced I
R
. This is caused by the series resistance of the die attach between the die (–)
output and the package (–) output pin. See the Output Saturation curve in the Typical Performance Characteristics section.
Reference voltage and temperature coefficient will change with output voltage. See Typical Performance Characteristics curves.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
LM4041 Typical Characteristics
Temperature Drift for Different
Average Temperature Coefficient
+0.5
I
R
= 150µA
+0.4
LM4041-1.2
+0.3
+0.2
12ppm/°C
+0.1
0
-0.1
-0.2
-22ppm/°C
-0.3
-51ppm/°C
-0.4
-0.5
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
1k
Output Impedence
vs. Frequency
T
J
= 25° C
∆I
R
= 0.1I
R
LM4041-1.2
1000
800
600
400
200
X
C
100
1k
10k
100k
FREQUENCY (Hz)
1M
0
1
Voltage Impedance
I
R
= 200µA
TJ = 25°C
LM4041-1.2
LM4041-ADJ: V
OUT
= V
REF
V
R
CHANGE (%)
IMPEDANCE (Ω)
C
L
= 0
10
I
R
= 150µA
1 I = 1mA
R
0.1
C
L
= 1µF
TANTALUM
NOISE (nV/
√
Hz )
100
10
100
1k
10k
100k
FREQUENCY (Hz)
Reverse Characteristics and
Minimum Operating Current
100
100
Reverse Characteristics and
Minimum Operating Current
REVERSE CURRENT (µA)
REVERSE CURRENT (µA)
R
S
30k
80
60
40
20
0
Typical
T
J
= 25°C
LM4041-1.2
0
0.4
0.8
1.2
1.6
2.0
80
60
40
20
0
Typical
T
J
= 25°C
LM4041-1.2
0
0.4
0.8
1.2
1.6
2.0
V
IN
1Hz rate
V
LM4041-1.2
R
Test Circuit
REVERSE VOLTAGE (V)
REVERSE VOLTAGE (V)
LM4040/4041
10
January 2000
MICREL [ MICREL SEMICONDUCTOR ]
