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LD2979M30-LD2979M33-LD2979M38-LD2979M50
VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT
LD2979
SERIESVERY LOW DROP
VOLTAGE REGULATORS WITH INHIBIT
April 2000 VERY LOW DROPOUT VOLTAGE
(0.2VTYP. AT50mA LOAD) VERY LOW QUIESCENT CURRENT
(TYP. 500μA AT50mALOAD) OUTPUT CURRENT UP TO50 mA 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 AT25oC TEMPERATURERANGE: -25 TO 125oC 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 usedas local regulator,it possibleto puta partof the boardin standby,
decreasingthe total power consumption.
SCHEMATIC DIAGRAM
SOT23-5L
TO-921/9
ABSOLUTE MAXIMUM RATING
Symbol Parameter Value UnitVIN DC Input Voltage 16 V
VINH DC Inhibit Input Voltage VIN V Output Current Internally limited mA
Ptot Power Dissipation Internally limited mW
Tstg Storage Temperature Range -40to 150 oC
Top Operating Junction TemperatureRange -25to 125 oC
CONNECTION DIAGRAM (top view)
ORDERING NUMBERS
SOT23-5L TO-92 Output VoltageLD2979M28
LD2979M30
LD2979M32
LD2979M33
LD2979M38
LD2979M50
LD2979Z28
LD2979Z30
LD2979Z32
LD2979Z33
LD2979Z38
LD2979Z50
2.85V
3.0V
3.2V
3.3V
3.8V
5.0V
SOT23-5L TO-92BOTTOM
VIEW
SYMBOL NAME AND FUNCTION PIN NUMBERSOT23-5L TO-92
VIN Input Voltage 1 3
GND Ground 2 2
INHIBIT Control Switch ON/OFF(*) 3 - Nottobe connected 4 -
VOUT Output Voltage 5 1
(*) Onlyforthe versionin SOT23-5L package: Inhibitpinisnot internally pulled-up thenit mustnotbe leftfloating. Connecttoa positive
voltage higher than2Vto able thedevice.
LD29792/9
ELECTRICAL CHARACTERISTICS FOR LD2979 (referto the test circuits,Ta =25oC,
VIN =VO(NOM) +1, CO =1 μF,IO= 1mA, Vinh =2V(*)) (unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit Output Voltage VIN =3.85VIo<50 mA, -25
2.85 2.907
2.964 Output Voltage VIN=4VIo<50 mA, -253.120 Output Voltage VIN =4.2VIo<50 mA, -253.2 3.264
3.328 Output Voltage VIN =4.3VIo<50 mA, -253.3 3.366
3.432 Output Voltage VIN =4.8VIo<50 mA, -253.8 3.876
3.952 Output Voltage VIN=6VIo<50 mA, -25Iout Output Current Limit 100 mA
ΔVo Line Regulation VO(NOM) +1-25%/Vin Quiescent Current ON MODE=0 mA=0 mA -25OFF MODE(*)
Vihn< 0.18V
Vihn< 0.18V -25SVR Supply Voltage Rejection Io=50 mA,f= 120 Hz, Cout =10μF63 dB Dropout Voltage Io=0 mA=0 mA -25Vil Control Input Logic Low -25Vih Control Input Logic High -25Vinhibit=5V, -25(*) Note: Only fortypesin SOT23-5L
LD2979
3/9
Output Voltagevs Temperature
Output Voltagevs Input Voltage
Dropout Voltagevs Temperature
Dropout Voltagevs OutputCurrent
QuiescentCurrentvs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Ta=25oC)
Output Voltagevs Input Voltage
LD2979
4/9
Short Circuit Currentvs Dropout Voltgae
InhibitCurrentvs Temperature
Vout
Iout
Vin: 5V, Iout: 1mAto 50mA, Time: 10us/DIV
Vout
20mV/ DIV
Iout
20mA/ DIV
Inhibit Voltagevs Temperature
Vout
Iout
Vin: 5V, Iout: 50mAto 1mA, Time: 10us/DIV
Vout
20mV/ DIV
Iout
20mA/ DIV
Load Transient Response
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
S.V.R.vs Frequency
Load Transient Response =10μF (ESR=1Ωat 1KHz) CO =10μF (ESR=1Ωat 1KHz)
LD2979
5/9
Line Transient Response
Vin: 200mV/DIV, Vout:5mV/DIV, Time: 20us/DIV
Vout
Vin
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VCC= 4.75 to5.25V,IOUT= 0.1A,CO =10μF (ESR=1Ωat 1KHz)
LD2979
6/9
