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LM2991QML Datenblatt(PDF) 9 Page - Texas Instruments

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Teilenummer LM2991QML
Bauteilbeschribung  Negative Low Dropout Adjustable Regulator
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LM2991QML
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SNVS392A – MARCH 2006 – REVISED OCTOBER 2011
MINIMUM LOAD
A minimum load current of 500
μA is required for proper operation. The external resistor divider can provide the
minimum load, with the resistor from the adjust pin to ground set to 2.4 k
Ω.
SETTING THE OUTPUT VOLTAGE
The output voltage of the LM2991 is set externally by a resistor divider using the following equation:
VOUT = VREF x (1 + R2/R1) − (IADJ x R2)
where VREF = −1.21V. The output voltage can be programmed within the range of −3V to −24V, typically an even
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 k
Ω makes the adjust pin current negligible. For example, neglecting the
adjust pin current, and setting R2 to 100 k
Ω and 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).
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 positive 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 diode to ground.
Typical Applications
VO = 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 10
Ω over the same operating
temperature range as the regulator.
Copyright © 2006–2011, Texas Instruments Incorporated
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