LM4051_05 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – Precision Micropower Shunt Voltage Reference

March 2005
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) SOT-23 surface-mount package. The LM4051’s ad-
vanced design eliminates the need for an external stabilizing
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: SOT-23
n No output capacitor required
n Tolerates capacitive loads
n Reverse breakdown voltage options of 1.225V and
adjustable
j Low output noise
(10 Hz to 10kHz)
j Wide operating current range
j Industrial temperature range
j Extended temperature range
j Low temperature coefficient
20µV_rms
60µA to 12mA
−40˚C to +85˚C
−40˚C to +125˚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
Key Specifications (LM4051-1.2)
j Output voltage tolerance
(A grade, 25˚C)
±0.1%(max)
Connection Diagrams
SOT-23
10122201
*This pin must be left floating or connected to pin 2.
Top View
See NS Package Number MF03A
10122240
© 2005 National Semiconductor Corporation DS101222
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