SNVS770G – JUNE 1999 – REVISED APRIL 2013
LM2941/LM2941C 1A Low Dropout Adjustable Regulator
Check for Samples:
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FEATURES
WSON Space Saving Package
Output Voltage Adjustable From 5V to 20V
Dropout Voltage Typically 0.5V @ I
O
= 1A
Output Current in Excess of 1A
Trimmed Reference Voltage
Reverse Battery Protection
Internal Short Circuit Current Limit
Mirror Image Insertion Protection
P
+
Product Enhancement Tested
TTL, CMOS Compatible ON/OFF Switch
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
voltage exceeds approximately 3V. The quiescent
current with 1A of output current and an input-output
differential of 5V is therefore only 30mA. Higher
quiescent currents only exist when the regulator is in
the dropout mode (V
IN
−
V
OUT
≤
3V).
Designed also for vehicular applications, the LM2941
and all regulated circuitry are protected from reverse
battery installations 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.
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Connection Diagrams
TO-220 Plastic Package
8-Lead WSON Surface Mount Package
ON/OFF
1
8
ADJ
GND
2
GND*
7
GND
Figure 1. Top View
See Package Number KC
TO-263 Surface-Mount Package
INPUT
3
6
N/C
N/C
4
5
OUTPUT
* TIE TO GND OR LEAVE FLOATING
Figure 3. Top View
See Package Number NGN
Figure 2. See Package Number KTT
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Copyright © 1999–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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