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기능 Negative Low Dropout Regulator
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5962-9571101QEA 데이터시트, 핀배열, 회로
June 1999
LM2990
Negative Low Dropout Regulator
General Description
The LM2990 is a three-terminal, low dropout, 1 ampere
negative voltage regulator available with fixed output volt-
ages of −5, −5.2, −12, and −15V.
The LM2990 uses new circuit design techniques to provide
low dropout and low quiescent current. The dropout voltage
at 1A load current is typically 0.6V and a guaranteed
worst-case maximum of 1V over the entire operating tem-
perature range. The quiescent current is typically 1 mA with
1A load current and an input-output voltage differential
greater than 3V. A unique circuit design of the internal bias
supply limits the quiescent current to only 9 mA (typical)
when the regulator is in the dropout mode (VOUT − VIN 3V).
Output voltage accuracy is guaranteed to ±5% over load,
and temperature extremes.
The LM2990 is short-circuit proof, and thermal shutdown in-
cludes hysteresis to enhance the reliability of the device
when overloaded for an extended period of time. The
LM2990 is available in a 3-lead TO-220 package and is rated
for operation over the automotive temperature range of
−40˚C to +125˚C.
Features
n 5% output accuracy over entire operating range
n Output current in excess of 1A
n Dropout voltage typically 0.6V at 1A load
n Low quiescent current
n Internal short circuit current limit
n Internal thermal shutdown with hysteresis
n Functional complement to the LM2940 series
Applications
n Post switcher regulator
n Local, on-card, regulation
n Battery operated equipment
Typical Application
DS010801-1
*Required if the regulator is located further than 6 inches from the power supply filter capacitors. A 1 µF solid tantalum or a 10 µF aluminum electrolytic
capacitor is recommended.
**Required for stability. Must be at least a 10 µF aluminum electrolytic or a 1 µF solid tantalum to maintain stability. May be increased without bound to
maintain regulation during transients. Locate the capacitor as close as possible to the regulator. The equivalent series resistance (ESR) is critical, and
should be less than 10over the same operating temperature range as the regulator.
Ordering Information and Connection Diagrams
Temperature
Range
−40˚C to
+125˚C
−55˚C to
+125˚C
-5.0
LM2990T-5.0
LM2990S-5.0
LM2990J-5.0-QML
5962-9571101QEA
LM2990WG5.0-QML
5962-9571101QXA
Output Voltage
-5.2 -12
LM2990T-5.2
LM2990T-12
LM2990S-12
LM2990J-12-QML
5962-9571001QEA
-15
LM2990T-15
LM2990S-15
LM2990J-15-QML
5962-9570901QEA
Package
TO-220
TO-263
J16A
WG16A
© 1999 National Semiconductor Corporation DS010801
www.national.com




5962-9571101QEA pdf, 반도체, 판매, 대치품
Electrical Characteristics (Continued)
VIN
ing
= −5V + VO(NOM) (Note 6) ,
temperature range, −40˚C
IO
TJ
=
1A, CO
125˚C,
= 47 µF, unless otherwise
all other limits apply for TJ
specified.
= 25˚C.
Boldface
limits
apply
over
the
entire
operat-
Parameter
Conditions
LM2990-12
Typ Limit
LM2990-15
Typ Limit
Units
(Limit)
(Note 4)
(Note 5)
(Note 4)
(Note 5)
Short Circuit Current
RL = 1(Note 7)
1.2 0.9 1.0 0.75 A (min)
Maximum Output Current (Note 7)
1.8 1.4 1.8 1.4 A (min)
Ripple Rejection
Vripple = 1 Vrms,
52 42 52 42 dB (min)
ƒripple = 1 kHz, IO = 5 mA
Output Noise Voltage
10 Hz–100 kHz, IO = 5 mA
500
1500
600
1800
µV (max)
Long Term Stability
1000 Hours
2000
2000
ppm
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: Human body model, 100 pF discharged through a 1.5 kresistor.
Note 3: The maximum power dissipation is a function of TJmax, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJmax
− TA)/θJA. If this dissipation is exceeded, the die temperature will rise above 125˚C, and the LM2990 will eventually go into thermal shutdown at a TJ of approximately
160˚C. For the LM2990, the junction-to-ambient thermal resistance, is 53˚C/W, 73˚C/W for the TO-263, and the junction-to-case thermal resistance is 3˚C. If the
TO-263 package is used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package. Using 0.5 square
inches of copper area, θJA is 50˚C/W; with 1 square inch of copper area, θJA is 37˚C/W; and with 1.6 or more square inches of copper area, θJA is 32˚C/W.
Note 4: Typicals are at TJ = 25˚C and represent the most likely parametric norm.
Note 5: Limits are guaranteed and 100% production tested.
Note 6: VO(NOM) is the nominal (typical) regulator output voltage, −5V, −5.2V, −12V or −15V.
Note 7: The short circuit current is less than the maximum output current with the −12V and −15V versions due to internal foldback current limiting. The −5V and
−5.2V versions, tested with a lower input voltage, does not reach the foldback current limit and therefore conducts a higher short circuit current level. If the LM2990
output is pulled above ground, the maximum allowed current sunk back into the LM2990 is 1.5A.
Definition of Terms
Dropout Voltage: The input-output voltage differential at
which the circuit ceases to regulate against further reduction
in input voltage. Measured when the output voltage has
dropped 100 mV from the nominal value obtained at (VO +
5V) input, dropout voltage is dependent upon load current
and junction temperature.
Input Voltage: The DC voltage applied to the input terminals
with respect to ground.
Input-Output Differential: The voltage difference between
the unregulated input voltage and the regulated output volt-
age for which the regulator will operate.
Line Regulation: The change in output voltage for a change
in the input voltage. The measurement is made under condi-
tions of low dissipation or by using pulse techniques such
that the average chip temperature is not significantly af-
fected.
Load Regulation: The change in output voltage for a
change in load current at constant chip temperature.
Long Term Stability: Output voltage stability under accelle-
rated life-test conditions after 1000 hours with maximum
rated voltage and junction temperature.
Output Noise Voltage: The rms AC voltage at the output,
with constant load and no input ripple, measured over a
specified frequency range.
Quiescent Current: That part of the positive input current
that does not contribute to the positive load current. The
regulator ground lead current.
Ripple Rejection: The ratio of the peak-to-peak input ripple
voltage to the peak-to-peak output ripple voltage.
Temperature Stability of VO: The percentage change in
output voltage for a thermal variation from room temperature
to either temperature extreme.
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5962-9571101QEA 전자부품, 판매, 대치품
Typical Applications
Post Regulator for an Isolated Switching Power Supply
The LM2940 is a positive 1A low dropout regulator; refer to its datasheet for further information.
DS010801-5
Fixed Current Sink
Adjustable Current Sink
DS010801-7
Application Hints
EXTERNAL CAPACITORS
The LM2990 regulator requires an output capacitor to main-
tain stability. The capacitor must be at least 10 µF aluminum
electrolytic or 1 µF solid tantalum. The output capacitor’s
ESR must be less than 10, or the zero added to the regu-
lator frequency response by the ESR could reduce the
phase margin, creating oscillations (refer to the graph on the
right). An input capacitor, of at least 1 µF solid tantalum or 10
µF aluminum electrolytic, is also needed if the regulator is
situated more than 6" from the input power supply filter.
FORCING THE OUTPUT POSITIVE
Due to an internal clamp circuit, the LM2990 can withstand
positive voltages on its output. If the voltage source pulling
the output positive is DC, the current must be limited to 1.5A.
A current over 1.5A fed back into the LM2990 could damage
the device. The LM2990 output can also withstand fast posi-
tive voltage transients up to 26V, without any current limiting
of the source. However, if the transients have a duration of
over 1 ms, the output should be clamped with a Schottky di-
ode to ground.
DS010801-10
Output Capacitor ESR
DS010801-9
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Negative Low Dropout Regulator

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