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LD2979M28TR-LD2979M30TR-LD2979M32TR-LD2979M33TR-LD2979M50TR
VERY LOW DROP VOLTAGE REGULATOR WITH INHIBIT
1/10February 2003 VERY LOW DROPOUT VOLTAGE
(0.2V TYP. AT 50mA LOAD) VERY LOW QUIESCENT CURRENT
(TYP. 500μA AT 50mA LOAD) OUTPUT CURRENT UP TO 50mA LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN OUTPUT VOLTAGES OF 2.85; 3.0; 3.2; 3.3;
3.8; 5.0V INTERNAL CURRENT AND THERMAL LIMIT SUPPLY VOLTAGE REJECTION: 63dB (TYP) ONLY 1μF FOR STABILITY SELECTION AT 25°C TEMPERATURE RANGE: -25°C TO 125°C PACKAGE AVAILABLE: SOT23-5L AND
TO-92
DESCRIPTIONThe LD2979 series are very Low Drop regulators
availablein SOT23-5L and TO-92.
The very low drop-voltage and the very low
quiescent current make them particularly suitable
for low noise, low power applications and in
battery powered systems.
Shutdown Logic Control functionis available on
five pin version (TTL compatible). This means that
when the deviceis used as local regulator,itis
possibleto puta partof the boardin standby,
decreasing the total power consumption.
LD2979
SERIESVERY LOW DROP
VOLTAGE REGULATORS WITH INHIBIT
SCHEMATIC DIAGRAM
LD2979 SERIES2/10
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
CONNECTION DIAGRAM (top view)
PIN DESCRIPTION(*) Onlyforthe versionin SOT23-5L package: Inhibitpinisnot internally pulled-up thenit mustnotbeleft floating. Connecttoa positive
voltagehigherthan2V toablethe device.
ORDERING CODES
LD2979 SERIES3/10
ELECTRICAL CHARACTERISTICS FOR LD2979 (referto the test circuits,Ta= 25°C,VIN=V O(NOM) +1V,
IO=1mA, VINH=2V(*) ,CO =1μF) (unless otherwise specified)
(*) Note: Onlyfor typesin SOT23-5L
LD2979 SERIES4/10
TYPICAL CHARACTERISTICS (unless otherwise specifiedTa= 25°C)
Figure1: Output Voltagevs Temperature
Figure2: Output Voltagevs Input Voltage
Figure3: Output Voltagevs Input Voltage
Figure4: Dropout Voltagevs Output Current
Figure5: Dropout Voltagevs Temperature
Figure6: Quiescent Currentvs Temperature
LD2979 SERIES5/10
Figure7: Short Circuit Currentvs Dropout
Voltage
Figure8: Supply Voltage Rejectionvs
Frequency
Figure9: Inhibit Currentvs Temperature
Figure10: Inhibit Voltagevs Temperature
Figure11: Load Transient Response
Figure12: Load Transient Response
LD2979 SERIES6/10
Figure13: Line Transient Response
