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부품번호 5962-9650501QXA 기능
기능 Negative Low Dropout Adjustable Regulator
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5962-9650501QXA 데이터시트, 핀배열, 회로
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




5962-9650501QXA pdf, 반도체, 판매, 대치품
Typical Performance Characteristics
Dropout Voltage
Normalized Output Voltage
Output Voltage
DS011260-13
Output Noise Voltage
Quiescent Current
DS011260-14
DS011260-15
Maximum Output Current
DS011260-16
Line Transient Response
DS011260-17
Load Transient Response
DS011260-18
Maximum Output Current
Ripple Rejection
DS011260-19
Output Impedance
DS011260-20
DS011260-21
ON /OFF Control Voltage
www.national.com
DS011260-22
DS011260-23
4
DS011260-24

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5962-9650501QXA

Negative Low Dropout Adjustable Regulator

National Semiconductor
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