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PDF LM4051AIM3X-ADJ Data sheet ( Hoja de datos )
| Número de pieza | LM4051AIM3X-ADJ | |
| Descripción | Precision Micropower Shunt Voltage Reference | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM4051AIM3X-ADJ (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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February 2000
LM4051
Precision Micropower Shunt Voltage Reference
General Description
Ideal for space critical applications, the LM4051 precision
voltage reference is available in the sub-miniature (3 mm x
1.3 mm) SSOT-23 surface-mount package. The LM4051’s
advanced design eliminates the need for an external stabiliz-
ing capacitor while ensuring stability with any capacitive
load, thus making the LM4051 easy to use. Further reducing
design effort is the availability of a fixed (1.225V) and adjust-
able reverse breakdown voltage. The minimum operating
current is 60 µA for the LM4051-1.2 and the LM4051-ADJ.
Both versions have a maximum operating current of 12 mA.
The LM4051 comes in three grades (A, B, and C). The best
grade devices (A) have an initial accuracy of 0.1%, while the
B-grade have 0.2% and the C-grade 0.5%, all with a tempco
of 50 ppm/˚C guaranteed from −40˚C to 125˚C.
The LM4051 utilizes fuse and zener-zap trim of reference
voltage during wafer sort to ensure that the prime parts have
an accuracy of better than ±0.1% (A grade) at 25˚C.
Features
n Small packages: SSOT-23
n No output capacitor required
n Tolerates capacitive loads
n Reverse breakdown voltage options of 1.225V and
adjustable
Key Specifications (LM4051-1.2)
n Output voltage tolerance
(A grade, 25˚C)
n Low output noise
(10 Hz to 10kHz)
n Wide operating current range
n Industrial temperature range
(tempco guaranteed from
−40˚C to +125˚C)
n Low temperature coefficient
±0.1%(max)
20µVrms
60µA to 12mA
−40˚C to +85˚C
50 ppm/˚C (max)
Applications
n Portable, Battery-Powered Equipment
n Data Acquisition Systems
n Instrumentation
n Process Control
n Energy Management
n Automotive and Industrial
n Precision Audio Components
n Base Stations
n Battery Chargers
n Medical Equipment
n Communication
Connection Diagrams
SSOT-23
DS101222-1
*This pin must be left floating or connected to pin 2.
Top View
See NS Package Number MF03A
DS101222-40
© 2000 National Semiconductor Corporation DS101222
www.national.com
1 page  
Electrical Characteristics (continued)
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 specifications 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 condi-
tions.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to am-
bient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax − TA)/θJA or the number
given in the Absolute Maximum Ratings, whichever is lower. For the LM4051, TJmax = 125˚C, and the typical thermal resistance (θJA), when board mounted, is
280˚C/W for the SSOT-23 package.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged di-
rectly into each pin.
Note 4: Typicals are at TJ = 25˚C and represent most likely parametric norm.
Note 5: Limits are 100% production tested at 25˚C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods.
The limits are used to calculate National’s AOQL.
Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance
±[(∆V R/∆T)(max ∆T)(VR)]. Where, ∆VR/∆T is the VR temperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25 ˚C to
T MAX or TMIN, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where
max∆T=65˚C is shown below:
A-grade: ±0.425% = ±0.1% ±50 ppm/˚C x 65˚C
B-grade: ±0.522% = ±0.2% ±50 ppm/˚C x 65˚C
C-grade: ±0.825% = ±0.5% ±50 ppm/˚C x 65˚C
Therefore, as an example, the A-grade LM4051-1.2 has an over-temperature Reverse Breakdown Voltage tolerance of ±1.2V x 0.425% = ±5.2 mV.
Note 7: When VOUT ≤ 1.6V, the LM4051-ADJ in the SSOT-23 package must operate at reduced IR. 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.
Note 8: Reference voltage and temperature coefficient will change with output voltage. See Typical Performance Characteristics curves.
Note 9: Long term stability is VR @ 25˚C measured during 1000 hrs.
Note 10: Thermal hysteresis is defined as the changes in 25˚C output voltage before and after cycling the device from −40˚C or +125˚C.
Typical Performance Characteristics
Temperature Drift for Different
Average Temperature Coefficient
Output Impedance vs Frequency
DS101222-19
DS101222-4
5 www.national.com
5 Page 
Typical Applications (Continued)
DS101222-25
FIGURE 6. Fast Positive Clamp
2.4V + VD1
DS101222-35
FIGURE 8. Bidirectional Adjustable
Clamp ±18V to ±2.4V
DS101222-26
FIGURE 7. Bidirectional Clamp ±2.4V
DS101222-36
FIGURE 9. Bidirectional Adjustable
Clamp ±2.4V to ±6V
FIGURE 10. Simple Floating Current Detector
DS101222-37
11 www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM4051AIM3X-ADJ.PDF ] | |
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