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LM4121 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM4121
Description  Precision Micropower Low Dropout Voltage Reference
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

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Electrical Characteristics
LM4121-ADJ Unless otherwise specified V
IN = 3.3V, VOUT =VREF,ILOAD =0, COUT = 0.01µF, TA =Tj = 25˚C. Lim-
its with standard typeface are for T
j = 25˚C, and limits in boldface type apply over the −40˚C ≤ TA ≤ +85˚C temperature
range.
Symbol
Parameter
Conditions
Min (Note 5)
Typ (Note 4)
Max (Note 5)
Units
V
OUT =VREF
Output Voltage Initial
Accuracy
LM4121A-ADJ
1.216
±0.2
%
LM4121-ADJ
±0.5
TCV
REF/˚C
Temperature Coefficient
−40˚C
≤ T
A ≤ +125˚C
14
50
ppm/˚c
∆V
REF/∆VIN
Line Regulation
1.8V
≤ V
IN ≤ 12V
0.0007
0.009
0.012
%/V
∆V
OUT/∆ILOAD
Load Regulation
0mA
≤ I
LOAD ≤ 1 mA
0.03
0.08
0.17
%/mA
1mA
≤ I
LOAD ≤ 5 mA
0.01
0.04
0.1
−1 mA
≤ I
LOAD ≤ 0 mA
0.04
0.12
−5 mA
≤ I
LOAD ≤ −1 mA
0.01
Min-V
IN
Minimum Operating Voltage
I
LOAD =5mA
1.5
1.8
V
V
N
Output Noise Voltage (Note 6)
0.1 Hz to 10 Hz
20
µV
PP
10 Hz to 10 kHz
30
µV
RMS
I
S
Supply Current
160
250
275
µA
I
SS
Power-down Supply Current
V
IN = 12V
Enable = 0.4V
Enable = 0.2V
1
2
µA
I
BIAS
Reference Pin Bias Current
(Note 7)
15
40
nA
V
H
Logic High Input Voltage
1.6
1.5
V
V
L
Logic Low Input Voltage
0.4
V
0.2
I
H
Logic High Input Current
7
15
µA
I
L
Logic Low Input Current
0.1
µA
I
SC
Short Circuit Current
V
OUT =0
15
mA
630
V
IN = 12V, VOUT =0
17
630
Hyst
Thermal Hysteresis
(Note 8)
−40˚C
≤ T
A ≤ 125˚C
0.5
mV/V
∆V
OUT
Long Term Stability
(Note 9)
1000 hrs. @ 25˚C
100
ppm
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guar-
anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: Without PCB copper enhancements. The maximum power dissipation must be de-rated at elevated temperatures and is limited by TJMAX (maximum junction
temperature),
θJ-A (junction to ambient thermal resistance) and TA (ambient temperature). The maximum power dissipation at any temperature is: PDissMAX =(TJMAX
−TA)/θJ-A up to the value listed in the Absolute Maximum Ratings.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k
Ω resistor into each pin. The machine model is a 200 pF capacitor discharged di-
rectly into each pin.
Note 4: Typical numbers are at 25˚C and represent the most likely parametric norm.
Note 5: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National’s Averaging Outgoing Quality Level (AOQL).
Note 6: Output noise for 1.25V option. Noise is proportional to VOUT.
Note 7: Bias Current flows out of the Adjust pin.
Note 8: Thermal hysteresis is defined as the change in +25˚C output voltage before and after exposing the device to temperature extremes.
Note 9: Long term stability is change in VREF at 25˚C measured continuously during 1000 hrs.
www.national.com
4


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