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SGS Thomson Microelectronics
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LD2981CM48TR
Datasheet
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SGS Thomson Microelectronics LD2981CM30TR, LD2981CM50TR, LD2981CM48TR, LD2981CM38TR, LD2981CM33TR Datasheet

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LD2981
VOLTAGE REGULATORS WITH INHIBIT
■ ULTRALOWDROPOUTVOLTAGE
(0.2VAT100mALOAD,7mVAT1mA LOAD)
■ VERYLOWQUIESCENTCURRENT
■ OUTPUT CURRENT UP TO100mA
■ LOGIC-CONTROLLEDELECTRONIC
SHUTDOWN
■ OUTPUT VOLTAGESOF 2.85;3.0;3.2;3.3;
3.8;4.85; 5.0V
■ INTERNALCURRENT AND THERMALLIMIT
■ AVAILABLEIN± 0.75%TOLLERANCE(AT
o
25
C, A VERSION)
■ OUTPUT LOWNOISEVOLTAGE160µVrms
■ ONLY4.7µF FOR STABILITY
■ TEMPERATURERANGE:-40 TO 125
■ SMALLESTPACKAGESOT23-5LAND
SOT-89
■ FASTDYNAMICRESPONCETO LINEAND
LOADCHANGES
DESCRIPTION
The LD2981 series are 100mA fixed-output voltage regulator. The ultra drop-voltage and the ultralow quiescentcurrent make them particularly suitablefor low noise, lowpower applications and in battery poweredsystems.
o
C
SERIES
VERY LOW DROP
SOT23-5L SOT-89
In sleep mode quiescent current is less than 1µA when INHIBIT pis is pulled low. Shutdown Logic Control function is available on pin n.3 (TTL compatible). This means that when the device is used aslocal regulator,it ispossible to put a part of the board in standby, decreasing the total power consumption. Typlical application are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personalstereo, camcorderand camera.
SCHEMATIC DIAGRAM
April 2000
1/12
LD2981
ABSOLUTE MAXIMUM RATING
Symbol Parameter Value Unit
V
DC InputVoltage 16 V
IN
V
THERMALDATA
Symbol Parameter SOT-89 SOT23-5L Unit
R
thj-cas e
INHBITInput Voltage 16 V
INH
OutputCurrent Internally limited mA
I
o
P
PowerDissipation Internally limited mW
tot
StorageTemperature Range - 55 to 150
T
stg
OperatingJunctionTemperatureRange - 40 to 125
T
op
Thermal ResistanceJunction-case 15 81
o
o
C
o
C
C/W
CONNECTION DIAGRAM
(*) Inhibitpin is not internallypulled-up then it must notbe left floating.Disable the device whenconnected to GND or to a positive voltage less than 0.18V
(topview)
SOT23-5L
SOT-89
ORDERING NUMBERS
AB VERSION C VERSION Output Voltage
SOT23-5L SOT-89 SOT23-5L SOT-89
LD2981ABM28TR LD2981ABM30TR LD2981ABM32TR LD2981ABM33TR LD2981ABM38TR LD2981ABM48TR LD2981ABM50TR
LD2981ABU28TR LD2981ABU30TR LD2981ABU32TR LD2981ABU33TR LD2981ABU38TR LD2981ABU48TR LD2981ABU50TR
LD2981CM28TR LD2981CM30TR LD2981CM32TR LD2981CM33TR LD2981CM38TR LD2981CM48TR LD2981CM50TR
LD2981CU28TR LD2981CU30TR LD2981CU32TR LD2981CU33TR LD2981CU38TR LD2981CU48TR LD2981CU50TR
2.85 V
3.0 V
3.2 V
3.3 V
3.8 V
4.85 V
5.0 V
APPLICATION CIRCUIT
2/12
LD2981
ELECTRICALCHARACTERISTICS FOR LD2981AB
V
IN=VO(NOM)
+1, CO=1µF, IO= 1mA, V
= 2V, unless otherwise specified)
INH
(refer to the test circuits,T
=25oC,
J
Symbol Parameter Test Conditions Min. Typ. Max. Unit
OutputVoltage VIN=3.85 V
V
o
OutputVoltage VIN=4V
V
o
OutputVoltage VIN=4.2 V
V
o
OutputVoltage VIN=4.3 V
V
o
OutputVoltage VIN=4.8 V
V
o
OutputVoltage VIN=5.85 V
V
o
OutputVoltage VIN=6V
V
o
OutputCurrentLimit 150 mA
I
out
V
∆
LineRegulation V
o
I
QuiescentCurrent ON MODE
d
<100 mA
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
<100 mA
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
<100 mA
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
1<I
<100 mA,
o
<100 mA, -40< TJ< 125oC
1<I
o
<100 mA,
1<I
o
1<I
<100 mA, -40< TJ< 125oC
o
<100 mA,
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
<100 mA,
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
+1< VIN<16V, Io=1mA
O(NOM)
-40 < T
I I I I I I I I
< 125oC
J
=0mA
o
=0 mA -40 <TJ< 125oC
o
=1mA
o
=1 mA -40 <TJ< 125oC
o
=25mA
o
=25 mA -40< TJ<125oC
o
=100 mA
o
=100 mA -40< TJ<125oC
o
2.828
2.822
2.779
2.977
2.970
2.925
3.176
3.168
3.12
3.275
3.267
3.217
3.771
3.762
3.705
4.813
4.801
4.729
4.962
4.950
4.875
2.85 2.872
2.878
2.921
33.023
3.030
3.075
3.2 3. 224
3.232
3.28
3.3 3. 325
3.333
3.383
3.8 3. 829
3.838
3.895
4.85 4.887
4.899
4.971
55.038
5.050
5.125
0.003 0.014
0.032
80
100 150
100
150 200
250
400 800
800
1300 2600
%/V
OFF MODE
<0.3 V
V
INH
<0.15 V -40 < TJ< 125oC
V
INH
SVR Supply Voltage Rejection f = 1KHz, C
DropoutVoltage Io=0mA
V
d
ControlInput LogicLow LOW = OutputOFF -40< TJ<125oC0.18V
V
il
ControlInput LogicHigh HIGH = Output ON -40< TJ<125oC2 V
V
ih
ControlInput Current V
I
i
=0 mA -40 <TJ< 125oC
I
o
=1mA
I
o
=1 mA -40 <TJ< 125oC
I
o
=25mA
I
o
=25 mA -40< TJ<125oC
I
o
=100 mA
I
o
=100 mA -40< TJ<125oC
I
o
=0 V , -40< TJ<125oC
INH
=5 V, -40< TJ<125oC
V
INH
=10µF63dB
out
eN OutputNoise Voltage(RMS) BW = 300Hz to50 KHz, C
ShortCircuitCurrent RL=0 150 mA
I
SC
1 7
70
200
0 5
=10µF160 µV
out
0.8 2
3 5
10
15 100 150 250 375
-1
15
V V V
V V V
V V V
V V V
V V V
V V V
V V V
µA µ µA µ µA µ µA µ
µ µA
mV mV mV mV mV mV mV mV
µA µ
in
A
A A A
A
A
3/12
LD2981
ELECTRICALCHARACTERISTICS FOR LD2981C
V
IN=VO(NOM)
+1, CO=1µF, IO= 1mA, V
= 2V, unless otherwise specified)
INH
(refer to the test circuits,T
=25oC,
J
Symbol Parameter Test Conditions Min. Typ. Max. Unit
OutputVoltage VIN=3.85 V
V
o
OutputVoltage VIN=4V
V
o
OutputVoltage VIN=4.2 V
V
o
OutputVoltage VIN=4.3 V
V
o
OutputVoltage VIN=4.8 V
V
o
OutputVoltage VIN=5.85 V
V
o
OutputVoltage VIN=6V
V
o
OutputCurrentLimit 150 mA
I
out
V
∆
LineRegulation V
o
I
QuiescentCurrent ON MODE
d
<100 mA
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
<100 mA
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
<100 mA
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
1<I
<100 mA,
o
<100 mA, -40< TJ< 125oC
1<I
o
<100 mA,
1<I
o
1<I
<100 mA, -40< TJ< 125oC
o
<100 mA,
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
<100 mA,
1<I
o
<100 mA, -40< TJ< 125oC
1<I
o
+1< VIN<16V, Io=1mA
O(NOM)
-40 < T
I I I I I I I I
< 125oC
J
=0mA
o
=0 mA -40 <TJ< 125oC
o
=1mA
o
=1 mA -40 <TJ< 125oC
o
=25mA
o
=25 mA -40< TJ<125oC
o
=100 mA
o
=100 mA -40< TJ<125oC
o
2.814
2.793
2.750
2.962
2.940
2.895
3.160
3.136
3.088
3.259
3.234
3.184
3.752
3.724
3.667
4.789
4.753
4.680
4.937
4.900
4.825
2.85 2.886
2.907
2.950
33.038
3.060
3.105
3.2 3. 240
3.264
3.312
3.3 3. 341
3.366
3.416
3.8 3. 848
3.876
3.933
4.85 4.911
4.947
5.020
55.063
5.100
5.175
0.003 0.014
0.032
80
100 150
100
150 200
250
400 800
800
1300 2600
%/V
OFF MODE
<0.3 V
V
INH
<0.15 V -40 < TJ< 125oC
V
INH
SVR Supply Voltage Rejection f = 1KHz, C
DropoutVoltage Io=0mA
V
d
ControlInput LogicLow LOW = OutputOFF -40< TJ<125oC0.18V
V
il
ControlInput LogicHigh HIGH = Output ON -40< TJ<125oC2 V
V
ih
ControlInput Current V
I
i
=0 mA -40 <TJ< 125oC
I
o
=1mA
I
o
=1 mA -40 <TJ< 125oC
I
o
=25mA
I
o
=25 mA -40< TJ<125oC
I
o
=100 mA
I
o
=100 mA -40< TJ<125oC
I
o
=0 V , -40< TJ<125oC
INH
=5 V, -40< TJ<125oC
V
INH
=10µF63dB
out
eN OutputNoise Voltage(RMS) BW = 300Hz to50 KHz, C
ShortCircuitCurrent RL=0 150 mA
I
SC
1 7
70
200
0 5
=10µF160 µV
out
0.8 2
3 5
10
15 100 150 250 375
-1
15
V V V
V V V
V V V
V V V
V V V
V V V
V V V
µA µ µA µ µA µ µA µ
µ µA
mV mV mV mV mV mV mV mV
µA µ
in
A
A A A
A
A
4/12
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