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PDF LM2941C Data sheet ( Hoja de datos )
| Número de pieza | LM2941C | |
| Descripción | 1A Low Dropout Adjustable Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1999
LM2941/LM2941C
1A Low Dropout Adjustable Regulator
General Description
The LM2941 positive voltage regulator features the ability to
source 1A of output current with a typical dropout voltage of
0.5V and a maximum of 1V over the entire temperature
range. Furthermore, a quiescent current reduction circuit has
been included which reduces the ground pin current when
the differential between the input voltage and the output volt-
age exceeds approximately 3V. The quiescent current with
1A of output current and an input-output differential of 5V is
therefore only 30 mA. Higher quiescent currents only exist
when the regulator is in the dropout mode (VIN − VOUT ≤ 3V).
Designed also for vehicular applications, the LM2941 and all
regulated circuitry are protected from reverse battery instal-
lations or two-battery jumps. During line transients, such as
load dump when the input voltage can momentarily exceed
the specified maximum operating voltage, the regulator will
automatically shut down to protect both the internal circuits
and the load. Familiar regulator features such as short circuit
and thermal overload protection are also provided.
Features
n Output voltage adjustable from 5V to 20V
n Dropout voltage typically 0.5V @ IO = 1A
n Output current in excess of 1A
n Trimmed reference voltage
n Reverse battery protection
n Internal short circuit current limit
n Mirror image insertion protection
n P+ Product Enhancement tested
n TTL, CMOS compatible ON/OFF switch
Connection Diagram and Ordering Information
TO-220 Plastic Package
16-Lead Ceramic Dual-in-Line Package
DS008823-2
Front View
Order Number LM2941T or LM2941CT
See NS Package Number TO5A
TO-263 Surface-Mount Package
DS008823-8
DS008823-9
Order Number LM2941S or LM2941CS
See NS Package Number TS5B
DS008823-31
Top View
Order Number LM2941J/883
5962-9166701QEA
See NS Package Number J16A
16-Lead Ceramic Surface Mount Package
DS008823-32
Front View
Order Number LM2941WG/883
5962-9166701QYA
See NS Package Number WG16A
© 1999 National Semiconductor Corporation DS008823
www.national.com
1 page  
Typical Performance Characteristics (Continued)
Low Voltage Behavior
Low Voltage Behavior
Output Capacitor ESR
Output at
Voltage Extremes
DS008823-21
Output at
Voltage Extremes
DS008823-22
Peak Output Current
DS008823-23
Maximum Power
Dissipation (TO-220)
DS008823-24
Maximum Power
Dissipation (TO-3)
DS008823-25
Maximum Power
Dissipation
(TO-263) (Note 3)
DS008823-26
DS008823-27
Definition of Terms
Dropout Voltage: The input-voltage differential at which the
circuit ceases to regulate against further reduction in input
voltage. Measured when the output voltage has dropped
100 mV from the nominal value obtained at (VOUT + 5V) in-
put, dropout voltage is dependent upon load current and
junction temperature.
Input Voltage: The DC voltage applied to the input terminals
with respect to ground.
Input-Output Differential: The voltage difference between
the unregulated input voltage and the regulated output volt-
age for which the regulator will operate.
DS008823-28
DS008823-29
Line Regulation: The change in output voltage for a change
in the input voltage. The measurement is made under condi-
tions of low dissipation or by using pulse techniques such
that the average chip temperature is not significantly af-
fected.
Load Regulation: The change in output voltage for a
change in load current at constant chip temperature.
Long Term Stability: Output voltage stability under acceler-
ated life-test conditions after 1000 hours with maximum
rated voltage and junction temperature.
Output Noise Voltage: The rms AC voltage at the output,
with constant load and no input ripple, measured over a
specified frequency range.
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LM2941C.PDF ] | |
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