Original Creation Date: 04/24/95
Last Update Date: 04/24/95
Last Major Revision Date: 04/24/95
MNLM2941K REV 0A0 MILITARY DATA SHEET
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
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).
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.
NS Part Numbers
LM2941K/883
Industry Part Number
LM2941
Prime Die
LM2941
Processing
MIL-STD-883, Method 5004
Quality Conformance Inspection
MIL-STD-883, Method 5005
Subgrp Description Temp ( C)
o
1 Static tests at +25
2 Static tests at +125
3 Static tests at -55
4 Dynamic tests at +25
5 Dynamic tests at +125
6 Dynamic tests at -55
7 Functional tests at +25
8A Functional tests at +125
8B Functional tests at -55
9 Switching tests at +25
10 Switching tests at +125
11 Switching tests at -55
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MILITARY DATA SHEET
MNLM2941K REV 0A0
Features
- Output voltage adjustable from 5V to 20V
- Dropout voltage typically 0.5V @ Io = 1A
- Output current in excess of 1A
- Trimmed reference voltage
- Reverse battery protection
- Internal short circuit current limit
- Mirror image insertion protection
- TTL, CMOS compatible ON/OFF switch
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MILITARY DATA SHEET
MNLM2941K REV 0A0
(Absolute Maximum Ratings)
Input Voltage (Survival Voltage < 100mS) 60V
Internal Power Dissipation
(Note 2) Internally Limited
Maximum Junction Temperature 150 C
Storage Temperature Range -65 C < Tj < +150 C
Lead Temperature (Soldering, 10 seconds) 300 C
ESD Susceptibility
(Note 3) 500V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Operating ratings indicate conditions for which the device is intended to be
functional, but device parameter specifications may not be guaranteed under these
conditions. For guaranteed specificatinos and test conditions, see the Electrical
Characteristics.
Note 2: The maximum power dissipation is a function of Tj(max), ThetaJA, and TA. The maximum
allowable power dissipation at any ambient temperature is PD=(Tj(max)-TA)/ThetaJA. If
this dissipation is exceeded, the die temperature will rise above 150 C and the
LM2941 will go into thermal shutdown. ThetaJA is 35 C/W and ThetaJC is 4 C/W.
Note 3: Human body model, 100pF discharged through 1.5K Ohms
Recommended Operating Conditions
Maximum Input Voltage 26V
Temperature Range -55 C < TA < 125 C
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MNLM2941K REV 0A0 MILITARY DATA SHEET
Electrical Characteristics
DC PARAMETERS:
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC: 5V < Vo < = 20V, Vin = Vo +5V, Cout = 22uF
SYMBOL PARAMETER CONDITIONS NOTES PIN-
NAME MIN MAX UNIT SUB-
GROUPS
Vref Reference Voltage 5mA < Io < 1A 1.237 1.313 V 1
5mA < Io < 1A 1.211 1.339 V 2, 3
Vrline Line Regulation Vo + 2V < Vin < 26V, Io = 5mA 3 10 mV/V 1, 2,
3
Vrload Load Regulation 50mA < Io < 1A 3 10 mV/V 1, 2,
3
Iq Quiescent Current Vo + 2V < Vin < 26V, Io = 5mA 15 mA 1
Vo + 2V < Vin < 26V, Io = 5mA 20 mA 2, 3
Vin = Vo + 5V, Io = 1A 45 mA 1
60 mA 2, 3
Vdo Dropout Voltage Io = 1A 0.8 V 1
1.00 V 2, 3
Io = 100mA 200 mV 1, 2,
3
Isc Short Circuit
Current Vin max = 26V 1.6 3.3 A 1
1.3 3.5 A 2, 3
Maximum
Operational Input
Voltage
2 26 VDC 1, 2,
3
Reverse Polarity
DC Input Voltage Ro = 100 Ohms, Vo > -0.6V 1 -15 V 1, 2,
3
V(TO) ON/OFF Threshold
Voltage ON Io < 1A 1 0.8 V 1, 2,
3
V(TO) ON/OFF Threshold
Voltage OFF Io < 1A 1 2.00 V 1, 2,
3
ON/OFF Threshold
Current V ON/OFF = 2.0V, Io < 1A 100 uA 1
V ON/OFF = 2.0V, Io < 1A 300 uA 2, 3
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MNLM2941K REV 0A0 MILITARY DATA SHEET
Electrical Characteristics
AC PARAMETERS:
(The following conditions apply to all the following parameters, unless otherwise specified.)
AC: 5V < Vo < = 20V, Vin = Vo +5V, Cout = 22uF
SYMBOL PARAMETER CONDITIONS NOTES PIN-
NAME MIN MAX UNIT SUB-
GROUPS
Maximum Line
Transient Vo max 1V above nominal Vo,
Ro = 100 Ohms, T < 100mS 4 60 V 7, 8A,
8B
Reverse Polarity
Transient Input
Voltage
T < 100mS, Ro = 100 Ohms 4 -50 V 7, 8A,
8B
RR Ripple Rejection fo = 1KHz, 1 Vrms, IL = 100mA 4 0.02 %/V 4
4 0.04 %/V 5, 6
Note 1: Functional test go no go only
Note 2: Condition for Vin
Note 3: Limit = mV per Volt of Vout
Note 4: %/V = % of Vin per Volt of Vout
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MILITARY DATA SHEET
MNLM2941K REV 0A0
Graphics and Diagrams
GRAPHICS# DESCRIPTION
K04ARF METAL CAN(KA), TO-3, 4 LEAD (P/P DWG)
See attached graphics following this page.
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