The LD2979 series are very Low Drop regulators
availablein SOT23-5Land TO-92.
The very low drop-voltage and the very low
quiescent current make them particularlysuitable
for low noise, low power applications and in
batterypowered systems.
Shutdown Logic Control function is available on
five pin version (TTL compatible). This means
o
C
o
C
SERIES
VERY LOW DROP
SOT23-5L
TO-92
that when the device is used as local regulator, it
is possible to put a part of the board in standby,
decreasingthe total powerconsumption.
SCHEMATIC DIAGRAM
April 2000
1/9
Page 2
LD2979
ABSOLUTE MAXIMUM RATING
SymbolParameterValueUnit
DC InputVoltage16V
V
IN
V
DC Inhibit InputVoltageV
INH
OutputCurrentInternally limitedmA
I
o
PowerDissipationInternally limitedmW
P
tot
StorageTemperature Range- 40 to 150
T
stg
OperatingJunctionTemperatureRange- 25 to 125
T
op
IN
V
o
C
o
C
CONNECTION DIAGRAM
(topview)
BOTTOM
VIEW
SOT23-5LTO-92
SYMBOLNAME AND FUNCTIONPIN NUMBER
SOT23-5LTO-92
V
IN
Input V o lt age13
GNDGr ound22
INHIBITControl Switch ON/OFF (*)3-
NCNot to be conne c t ed4-
V
OUT
(*) Only for the version in SOT23-5L package: Inhibitpin is not internally pulled-up then it must not be left floating. Connect toa positive
voltage higher than 2V to able the device.
ELECTRICALCHARACTERISTICS FOR LD2979 (refer to the test circuits, Ta=25oC,
V
IN=VO(NOM)
+1, CO=1µF, IO= 1mA, V
inh
(*)
=2V
) (unlessotherwise specified)
SymbolParameterTest ConditionsMin.Typ.Max.Unit
OutputVoltageVIN=3.85 V
V
o
OutputVoltageVIN=4V
V
o
OutputVoltageVIN=4.2 V
V
o
OutputVoltageVIN=4.3 V
V
o
OutputVoltageVIN=4.8 V
V
o
OutputVoltageVIN=6V
V
o
OutputCurrentLimit100mA
I
out
LineRegulationV
V
∆
o
I
QuiescentCurrentON MODE
d
<50 mA,-25< Ta< 125oC
1<I
o
<50 mA,-25< Ta< 125oC
1<I
o
<50 mA,-25< Ta< 125oC
1<I
o
<50 mA,-25< Ta< 125oC
1<I
o
<50 mA,-25< Ta< 125oC
1<I
o
<50 mA,-25< Ta< 125oC
1<I
o
+1< VIN<16V,Io=1mA
O(NOM)
-25 < T
I
I
I
I
<125oC
a
=0mA
o
=0 mA-25< Ta<125oC
o
=50mA
o
=50 mA-25< Ta< 125oC
o
2.793
2.736
2.940
2.880
3.136
3.072
3.234
3.168
3.724
3.648
4.9
4.8
2.852.907
2.964
33.060
3.120
3.23. 264
3.328
3.33. 366
3.432
3.83. 876
3.952
55.1
5.2
0.028
0.064
80
110
170
500
700
1300
%/V
OFF MODE(*)
< 0.18 V
V
ihn
< 0.18 V -25< Ta<125oC
V
ihn
SVRSupply Voltage RejectionI
Dropout VoltageIo=0mA
V
d
Control InputLogicLow-25 < Ta<125oC(*)DeviceOff0.18V
V
il
Control InputLogicHigh-25 < Ta<125oC(*)DeviceOn2V
V
ih
Control InputCurrentV
I
i
=50 mA, f= 120Hz, C
o
=0 mA-25< Ta<125oC
I
o
=1mA
I
o
=1 mA-25< Ta<125oC
I
o
=10mA
I
o
=10 mA-25< Ta< 125oC
I
o
=50mA
I
o
=50 mA-25< Ta< 125oC
I
o
=0 V (*)
inhibit
=5 V,-25< Ta<125oC (*)
V
inhibit
eNOutputNoise Voltage(RMS)BW = 300Hz to50 KHz, C
(*) Note: Only for types inSOT23-5L
=10µF63 dB
out
=10µF160
out
0
6
30
100
200
0
5
1
12
18
60
90
200
300
400
600
-1
15
V
V
V
V
V
V
V
V
V
V
V
V
in
A
µ
A
µ
A
µ
A
µ
µA
A
µ
mV
mV
mV
mV
mV
mV
mV
mV
A
µ
A
µ
V
µ
3/9
Page 4
LD2979
TYPICALPERFORMANCE CHARACTERISTICS
OutputVoltage vs Temperature
OutputVoltage vs Input Voltage
(unless otherwise specified T
OutputVoltage vs InputVoltage
Dropout Voltagevs OutputCurrent
=25oC)
a
DropoutVoltagevs Temperature
4/9
QuiescentCurrent vs Temperature
Page 5
LD2979
TYPICALPERFORMANCE CHARACTERISTICS
Short Circuit Currentvs Dropout Voltgae
InhibitCurrent vs Temperature
(continued)
S.V.R.vs Frequency
InhibitVoltagevs Temperature
LoadTransient Response
Vout
20mV/ DIV
Vout
Iout
Vin: 5V, Iout: 1mA to 50mA, Time : 10us/DIV
CO=10µF (ESR=1Ω at 1KHz)CO=10µF (ESR=1Ω at 1KHz)
Iout
20mA/ DIV
LoadTransient Response
Vout
Iout
Vin: 5V, Iout: 50mA to 1mA, Time : 10us/DIV
20mA/ DIV
Vout
20mV/ DIV
Iout
5/9
Page 6
LD2979
TYPICALPERFORMANCE CHARACTERISTICS
Line TransientResponse
Vout
Vin
Vin :200mV/DIV, Vout:5mV/DIV, Time : 20us/DIV
VCC= 4.75 to 5.25V, I
= 0.1A, CO=10µF(ESR=1Ω at 1KHz)
OUT
(continued)
6/9
Page 7
LD2979
7/9
Page 8
LD2979
DIM.
A4.585.330.1800.210
B4.455.20.1750.204
C3.24.20.1260.165
D12.70.500
E1.270.050
TO-92 MECHANICAL DATA
mminch
MIN.TYP.MAX.MIN.TYP.MAX.
F0.40.510.0160.020
G0.350.14
8/9
Page 9
LD2979
Information furnished isbelieved to be accurate and reliable.However,STMicroelectronics assumes no responsibility forthe consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implicationor otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject tochange without notice. Thispublication supersedes andreplaces allinformationpreviously supplied. STMicroelectronics products
are not authorized for use as critical components in lifesupport devices or systems withoutexpress written approval of STMicroelectronics.
The ST logo isa registered trademark of STMicroelectronics
2000 STMicroelectronics – Printedin Italy – All RightsReserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - China - Finland -France -Germany - Hong Kong - India - Italy- Japan- Malaysia - Malta - Morocco
Singapore - Spain- Sweden - Switzerland- United Kingdom - U.S.A.
http://www.st.com
.
9/9
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