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參數(shù)資料
| 型號(hào)： | LM4120 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Precision Micropower Low Dropout Voltage Reference |
| 中文描述： | 精密微功耗低壓差電壓基準(zhǔn) |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 289K |
| 代理商： | LM4120 |
Electrical Characteristics
LM4120-3.0V, 3.3V, 4.096V and 5.0V
Unless otherwise specified V
IN
= V
OUT
+ 1V, I
LOAD
= 0, C
OUT
=
0.01μF, T
= T
= 25C. Limits with standard typeface are for T
j
= 25C, and limits in
boldface type
apply over the 40C
≤
T
A
≤
+85C temperature range. (Continued)
Symbol
Parameter
Conditions
Min
(Note 5)
Typ
(Note 4)
2.4
Max
(Note 5)
Units
V
V
H
Logic High Input Voltage
2.4
V
L
Logic Low Input Voltage
0.4
V
0.2
15
I
H
I
L
Logic High Input Current
Logic Low Input Current
7
μA
μA
0.1
15
I
SC
Short Circuit Current
V
OUT
= 0
mA
6
30
V
IN
= 12V, V
OUT
= 0
17
6
30
Hyst
Thermal Hysteresis
(Note 7)
Long Term Stability
(Note 9)
40C
≤
T
A
≤
125C
0.5
mV/V
V
OUT
1000 hrs.
@
25C
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 T
JMAX
(maximum junction
temperature),
θ
J-A
(junction to ambient thermal resistance) and T
A
(ambient temperature). The maximum power dissipation at any temperature is: PDiss
MAX
=(T
JMAX
T
A
)/
θ
J-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
resistor into each pin. The machine model is a 200 pF capacitor discharged di-
rectly into each pin.
Note 4:
Typical numbers are at 25C and represent the most likely parametric norm.
Note 5:
Limits are 100% production tested at 25C. 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:
Dropout voltage is the differential voltage between V
OUT
and V
IN
at which V
OUT
changes
≤
1% from V
OUT
at V
IN
= 3.3V for 1.8V, 2.0V, 2.5V and V
OUT
+
1V for others.For 1.8V option, dropout voltage is not guaranteed over temperature. A parasitic diode exists between input and output pins; it will conduct if V
OUT
is
pulled to a higher voltage than V
IN
.
Note 7:
Thermal hysteresis is defined as the change in +25C output voltage before and after exposing the device to temperature extremes.
Note 8:
Output noise voltage is proportional to V
OUT
. V
N
for other voltage option is calculated using (V
N(1.8V)
/1.8)
*
V
OUT
. V
N
(2.5V) =(36μV
PP
/1.8)
*
2.5=46μV
PP
.
Note 9:
Long term stability is change in V
REF
at 25C measured continuously during 1000 hrs.
LM4120 Typical Operating Characteristics
Unless otherwise specified, V
IN
= 3.3V, V
OUT
= 2.5V,
I
LOAD
= 0, C
OUT
= 0.022μF, T
A
= 25C and V
EN
= V
IN
.
Long Term Drift
DS101047-12
Typical Temperature Drift
DS101047-13
Short Circuit Current vs
Temperature
DS101047-14
L
www.national.com
5
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