LM2941/LM2941C 1A Low Dropout Adjustable Regulator
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 (V
IN
− V
OUT
≤
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
n
n
n
n
n
n
n
n
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
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
DS008823-31
TO-263 Surface-Mount Package
Top View
Order Number LM2941J/883
5962-9166701QEA
See NS Package Number J16A
16-Lead Ceramic Surface Mount Package
DS008823-8
DS008823-9
Order Number LM2941S or LM2941CS
See NS Package Number TS5B
DS008823-32
Front View
Order Number LM2941WG/883
5962-9166701QYA
See NS Package Number WG16A
© 1999 National Semiconductor Corporation
DS008823
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
