UNISONIC TECHNOLOGIES CO.,
LM2940
LINEAR INTEGRATED CIRCUIT
1A LOW-DROPOUT VOLTAGE
REGULATOR
1
1
TO-263-3
TO-252
TO-220
ꢀ
DESCRIPTION
The UTC LM2940 is a positive voltage regulator features the
1
1
ability to source 1A of output current with a dropout voltage of
typically 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 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 (VIN-VOUT≤3V).
SOT-223
SOP-16
DIP-16
*Pb-free plating product number: LM2940L
Designed also for vehicular applications, the UTC LM2940 is
protected from reverse battery installations or 2-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. The UTC LM2940 cannot be
harmed by temporary mirror-image insertion. Familiar regulator
features such as short circuit and thermal overload protection are
also provided.
ꢀPIN CONFIGURATION
PIN NO.
PIN NAME
VIN
1
2
3
GND
VOUT
ꢀ
FEATURES
*Dropout voltage typically 0.5V @Io=1A
*Output current in excess of 1A
*Output voltage trimmed before assembly
*Reverse battery protection
*Internal short circuit current limit
*Mirror image insertion protection
*P+ Product Enhancement tested.
ꢀ ORDERING INFORMATION
Order Number
Package
Packing
Normal
Lead free
LM2940-xx-TQ3-R LM2940L-xx-TQ3-R
LM2940-xx-TQ3-T LM2940L-xx-TQ3-T
LM2940-xx-TN3-R LM2940L-xx-TN3-R
TO-263-3
TO-263-3
TO-252
TO-252
SOT-223
SOP-16
SOP-16
DIP-16
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tape Reel
Tube
LM2940-xx-TN3-T
LM2940L-xx-TN3-T
LM2940-xx-AA3-R LM2940L-xx-AA3-R
LM2940-xx-S16-R
LM2940-xx-S16-T
LM2940-xx-D16-T
LM2940-xx-TA3-T
LM2940L-xx-S16-R
LM2940L-xx-S16-T
LM2940L-xx-D16-T
LM2940L-xx-TA3-T
Tube
Tube
TO-220
Note: xx: Output Voltage, refer to Marking Information.
www.unisonic.com.tw
1
Copyright © 2005 Unisonic Technologies Co.,
QW-R102-016.B