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5962-9650501VEA の電気的特性と機能

5962-9650501VEAのメーカーはNational Semiconductorです、この部品の機能は「Negative Low Dropout Adjustable Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 5962-9650501VEA
部品説明 Negative Low Dropout Adjustable Regulator
メーカ National Semiconductor
ロゴ National Semiconductor ロゴ 




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5962-9650501VEA Datasheet, 5962-9650501VEA PDF,ピン配置, 機能
May 1999
LM2991
Negative Low Dropout Adjustable Regulator
General Description
The LM2991 is a low dropout adjustable negative regulator
with a output voltage range between −3V to −24V. The
LM2991 provides up to 1A of load current and features a On
/Off pin for remote shutdown capability.
The LM2991 uses new circuit design techniques to provide a
low dropout voltage, low quiescent current and low tempera-
ture coefficient precision reference. 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
a 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).
The LM2991 is short-circuit proof, and thermal shutdown in-
cludes hysteresis to enhance the reliability of the device
when inadvertently overloaded for extended periods. The
LM2991 is available in 5-lead TO-220 and TO-263 packages
and is rated for operation over the automotive temperature
range of −40˚C to +125˚C. Mil-Aero versions are also avail-
able.
Features
n Output voltage adjustable from −3V to −24V, typically
−2V to −25V
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 TTL, CMOS compatible ON/OFF switch
n Functional complement to the LM2941 series
Applications
n Post switcher regulator
n Local, on-card, regulation
n Battery operated equipment
Typical Application
DS011260-1
VOUT = VREF (1 + R2/R1)
*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.
© 1999 National Semiconductor Corporation DS011260
www.national.com

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5962-9650501VEA pdf, ピン配列
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
ESD Susceptibility (Note 2)
Power Dissipation (Note 3)
Junction Temperature (TJmax)
−26V to +0.3V
2 kV
Internally limited
125˚C
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
−65˚C to +150˚C
230˚C
Operating Ratings (Note 1)
Junction Temperature Range (TJ)
Maximum Input Voltage (Operational)
−40˚C to +125˚C
−26V
Electrical Characteristics
VIN = −10V, VO = −3V, IO = 1A, CO = 47 µF, R1 = 2.7k, TJ = 25˚C, unless otherwise specified. Boldface limits apply over
the entire operating junction temperature range.
Parameter
Conditions
Typical
Min
Max
Units
(Note 4)
Reference Voltage
Output Voltage
Range
Line Regulation
Load Regulation
Dropout Voltage
5 mA IO 1A
5 mA IO 1A,
VO − 1V VIN −26V
VIN = −26V
IO = 5 mA, VO − 1V VIN −26V
50 mA IO 1A
IO = 0.1A, VO 100 mV
IO = 1A, VO 100 mV
−1.210
−2
−25
0.004
0.04
0.1
0.6
−1.234
−1.27
−24
−1.186
−1.15
−3
0.04
0.4
0.2
0.3
0.8
1
V
V
V
V
%/V
%
V
V
Quiescent Current
Dropout Quiescent
Current
Ripple Rejection
Output Noise
ON /OFF Input
Voltage
ON /OFF Input
Current
Output Leakage
Current
Current Limit
IO 1A
VIN = VO, IO 1A
Vripple = 1 Vrms, f ripple = 1 kHz,
IO = 5 mA
10 Hz − 100 kHz, IO = 5 mA
(VOUT: ON)
(VOUT: OFF)
VON/OFF = 0.8V (VOUT: ON)
VON/OFF = 2.4V (VOUT: OFF)
VIN = −26V, VON/OFF = 2.4V
VOUT = 0V
VOUT = 0V
0.7 5 mA
16 50 mA
60 50
dB
200 450 µV
1.2 0.8 V
1.3 2.4
0.1 10 µA
40 100
60 250 µA
2 1.5
A
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the deivce 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 LM2991 will go into thermal shutdown. For the LM2991, the
junction-to-ambient thermal resistance is 53˚C/W for the TO-220, 73˚C/W for the TO-263, and junction-to-case thermal resistance is 3˚C. If the TO-263 package is
used, the thermal resistance can be reduced by increasing the PC 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.
3 www.national.com


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5962-9650501VEA 電子部品, 半導体
Application Hints (Continued)
greater range of −2V to −25V. The adjust pin current is about
60 nA, causing a slight error in the output voltage. However,
using resistors lower than 100 kmakes the adjust pin cur-
rent negligible. For example, neglecting the adjust pin cur-
rent, and setting R2 to 100 kand VOUT to −5V, results in an
output voltage error of only 0.16%.
ON/OFF PIN
The LM2991 regulator can be turned off by applying a TTL or
CMOS level high signal to the ON/OFF pin (see Adjustable
Current Sink Application).
Typical Applications
FORCING THE OUTPUT POSITIVE
Due to an internal clamp circuit, the LM2991 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 LM2991 could damage
the device. The LM2991 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.
Fully Isolated Post-Switcher Regulator
Adjustable Current Sink
DS011260-6
www.national.com
DS011260-10
6

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部品番号部品説明メーカ
5962-9650501VEA

Negative Low Dropout Adjustable Regulator

National Semiconductor
National Semiconductor


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