SNVS389B – MAY 2010 – REVISED MAY 2013
LM2940QML 1A Low Dropout Regulator
Check for Samples: LM2940QML, LM2940QML-SP
•2 Available with Radiation Ensure
– ELDRS Free 100 krad(Si)
• 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
The LM2940 positive voltage regulator features the
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 30 mA. Higher
quiescent currents only exist when the regulator is in
the dropout mode (VIN − VOUT ≤ 3V).
Designed also for vehicular applications, the LM2940
and all regulated circuitry are 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 LM2940 cannot be harmed by temporary mirror-
image insertion. Familiar regulator features such as
short circuit and thermal overload protection are also
Figure 1. 16-Lead Ceramic Surface-Mount Package (CFP) Top View
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