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LM2941 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer LM2941
Beschreibung 1A Low Dropout Adjustable Regulator
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 10 Seiten
LM2941 Datasheet, Funktion
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
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LM2941 Datasheet, Funktion
Definition of Terms (Continued)
Quiescent Current: That part of the positive input current
that does not contribute to the positive load current. The
regulator ground lead current.
Ripple Rejection: The ratio of the peak-to-peak input ripple
voltage to the peak-to-peak output ripple voltage.
Typical Applications
Temperature Stability of VO: The percentage change in
output voltage for a thermal variation from room temperature
to either temperature extreme.
5V to 20V Adjustable Regulator
DS008823-3
Note: Using 1k for R1 will ensure that the input bias current error of the adjust pin will be negligible. Do not bypass R1 or R2. This will lead to instabilities.
* Required if regulator is located far from power supply filter.
** COUT must be at least 22 µF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the
regulator. This capacitor must be rated over the same operating temperature range as the regulator and the ESR is critical; see curve.
1A Switch
DS008823-6
*** To assure shutdown, select Resistor R3 to guarantee at least 300 µA of pull-up current when S1 is open. (Assume 2V at the ON/OFF pin.)
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