STMicroelectronics LD2981 User Manual
LD2981
SERIES
ULTRA LOW DROP VOLTAGE REGULATORS WITH INHIBIT
LOW ESR OUTPUT CAPA CITORS COMPATIBLE
■ STABLE WITH LOW ESR CERAMIC
CAPACITORS
■ ULTRA LOW DROPOUT VOLTAGE (0.17V
TYP. AT 100m A LOAD, 7mV TYP. AT 1m A
LOAD)
■ VERY LOW QUIESCENT CURRENT (80µA
TYP. AT NO LOAD IN ON MODE; MAX 1µA
IN OFF MODE)
■ GUARANTEED OUTPUT CURRENT UP TO
100mA
■ LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
■ OUTPUT VOLTAGE OF 1.5; 1.8; 2.5; 2.85;
3.0; 3.2; 3.3; 3.6; 3.8; 4.0; 4.7; 4.85; 5.0V
■ INTERNAL CURRENT AND THERMAL LIMIT
■ ± 0.75% TOLERANCE OUTPUT VOLTAGE
AVAILABLE (A VERSION)
■ OUTPUT LOW NOISE VOLTAGE 160µVRM S
■ TEMPERATURE RANGE: -40 TO 125°C
■ SMALLEST PACKAGE SOT23-5L AND
SOT-89
■ FAST DYNAMIC RESPONSE TO LINE AND
LOADCHANGES
DESCRIPTION
The LD2981 series are 100mA fixed-output
voltage regulator. The low drop-voltage and the
ultra l ow quiescent current make them suitable for
low noise, low power applications and in battery
powered systems.
The quiescent current in sleep mode is less than
1µA when INHIBIT pin is pulled low. Shutdown
Logic Control function is available on pin n.3 (TTL
compatible). This means that when the device is
used as local regulator, it is possible to put a part
of the board in standby, decreasing the total
power consum ption. The LD2981 is designed to
work with l ow ESR ceramic capacitor. Typical
applications are in cellular phone, palmtop/laptop
computer, personal digital assistant (PDA),
personal stereo, camcorder and camera.
SOT23-5L SOT-89
SCHEMATIC DIAGRAM
1/17September 2003
LD2981 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
INH
I
P
T
STG
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol Parameter SOT23-5L SOT-89 Unit
R
thj-case
R
thj-amb
CONNECTION DIAGRAM (top view)
DC Input Voltage
I
INHIBIT Input Voltage
Output Current
O
Power Dissipation
D
Storage Temperature Range
Operating Junction Temperature Range
OP
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
-0.3 to 16 V
-0.3 to 16 V
Internally limited
Internally limited
-55 to 150 °C
-40 to 125 °C
81 15 °C/W
255 110 °C/W
SOT23-5L SOT-89
PIN DESCRIPTION
Pin N°
SOT23-5L
13 V
2 2 GND Ground Pin
3 INHIBIT Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be
4 NC Not Connected
51V
2/17
Pin N°
SOT-89
Symbol Name and Function
IN
Input Port
left floating. Disable the device when connected to GND or to a
positive voltage less than 0.18V
OUT
Output Port
ORDERING CODES
LD2981 SERIES
AB VERSION C VERSION
SOT23-5L SOT-89 SOT23-5L SOT-89
LD2981CM15TR LD2981CU15TR 1.5 V
LD2981CM18TR LD2981CU18TR 1.8 V
LD2981ABM25TR LD2981ABU25TR LD2981CM25TR LD2981CU25TR 2.5 V
LD2981ABM28TR LD2981ABU28TR LD2981CM28TR LD2981CU28TR 2.85 V
LD2981ABM30TR LD2981ABU30TR LD2981CM30TR LD2981CU30TR 3.0 V
LD2981ABM32TR LD2981ABU32TR LD2981CM32TR LD2981CU32TR 3.2 V
LD2981ABM33TR LD2981ABU33TR LD2981CM33TR LD2981CU33TR 3.3 V
LD2981ABM36TR LD2981ABU36TR LD2981CM36TR LD2981CU36TR 3.6 V
LD2981ABM38TR LD2981ABU38TR LD2981CM38TR LD2981CU38TR 3.8 V
LD2981ABM40TR LD2981ABU40TR LD2981CM40TR LD2981CU40TR 4.0 V
LD2981ABM47TR LD2981ABU47TR LD2981CM47TR LD2981CU47TR 4.7 V
LD2981ABM48TR LD2981ABU48TR LD2981CM48TR LD2981CU48TR 4.85 V
LD2981ABM50TR LD2981ABU50TR LD2981CM50TR LD2981CU50TR 5.0 V
VOLTAGES
TYPICAL AP PLICATION CIRCUIT
OUTPUT
(*) Inhibit Pin is not internally pulled-up then it must not be left floating. Disable the device when connected to GND or to a positive voltage
less than 0.18V.
3/17
LD2981 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2981AB (Tj= 25°C, VI=V
C
=2.2µF(X7R), IO=1mA,V
O
= 2V, unless otherwise specified)
INH
O(NOM)
+1V, CI=1µF(X7R),
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Operating Input Voltage 2.5 16 V
OP
Output Voltage IO= 1 mA 2.481 2.5 2.518 V
V
O
= 1 to 100 mA 2.475 2.525
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 2.828 2.85 2.872 V
O
= 1 to 100 mA 2.822 2.878
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 2.977 3 3.023 V
O
= 1 to 100 mA 2.970 3.030
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 3.176 3.2 3.224 V
O
= 1 to 100 mA 3.168 3.232
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 3.275 3.3 3.325 V
O
= 1 to 100 mA 3.267 3.333
I
O
IO= 1 to 100 mA TJ= -40 to 125°C
V
Output Voltage IO= 1 mA 3.573 3.6 3.627 V
O
= 1 to 100 mA 3.564 3.636
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 3.771 3.8 3.829 V
O
= 1 to 100 mA 3.762 3.838
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 3.97 4 4.03 V
O
= 1 to 100 mA 3.96 4.04
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 4.664 4.7 4.735 V
O
= 1 to 100 mA 4.653 4.747
I
O
= 1 to 100 mA TJ= -40 to 125°C
I
O
V
Output Voltage IO= 1 mA 4.813 4.85 4.887 V
O
= 1 to 100 mA 4.801 4.899
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 4.962 5 5.038 V
O
= 1 to 100 mA 4.950 5.050
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
∆V
Line Regulation V
O
T
+1<VIN<16V IO= 1 mA 0.003 0.014 %/V
O(NOM)
= -40 to 125°C
J
2.437 2.562
2.779 2.921
2.925 3.075
3.12 3.28
3.217 3.383
3.510 3.690
3.705 3.895
3.9 4.1
4.582 4.817
4.729 4.971
4.875 5.125
0.032
4/17
LD2981 SERIES
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
Quiescent Current
Q
ON MODE
OFF MODE V
V
Dropout Voltage (NOTE 1) IO=0 1 3 mV
DROP
I
Short Circuit Current RL= 0 150 mA
SC
SVR Supply Voltage Rejection C
V
T
(NOTE 1): For Vo < 2.5V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
Inhibit Input Logic Low
INH
V
Inhibit Input Logic High
INL
Inhibit Input Current
I
INH
e
Output Noise Voltage BW= 300 Hz to 50 KHz CO=10µF 160 µV
N
Thermal Shutdown 170 °C
SHDN
IO= 0 80 100 µA
=0 TJ= -40 to 125°C
I
O
I
= 1 mA 100 150
O
IO=1mA TJ= -40 to 125°C
I
= 25 mA 250 400
O
IO=25mA TJ= -40 to 125°C
I
= 100 mA 1000 1300
O
= 100 mA TJ= -40 to 125°C
I
O
< 0.3 V 0.8
INH
< 0.15 V TJ= -40 to 125°C
V
INH
I
=0 TJ= -40 to 125°C
O
=1mA 7 10
I
O
I
=1mA TJ= -40 to 125°C
O
= 25mA 70 100
I
O
I
= 25mA TJ= -40 to 125°C
O
= 100mA 180 250
I
O
I
= 100mA TJ= -40 to 125°C
O
=10µFf=1KHz 63 dB
O
LOW = Output OFF T
HIGH = Output ON T
V
=0V TJ= -40 to 125°C
INH
=5V TJ= -40 to 125°C
V
INH
= -40 to 125°C
J
= -40 to 125°C
J
1.6 V
150
200
800
2600
2
5
15
150
375
0.18 V
0-1µA
515
RMS
5/17
LD2981 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2981C (Tj= 25°C, VI=V
C
=2.2µF(X7R), IO=1mA,V
O
= 2V, unless otherwise specified)
INH
O(NOM)
+1V, CI=1µF(X7R),
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Operating Input Voltage 2.5 16 V
OP
Output Voltage IO= 1 mA 1.478 1.5 1.522 V
V
O
= 1 to 100 mA 1.470 1.530
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 1.777 1.8 1.822 V
O
= 1 to 100 mA 1.764 1.836
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 2.468 2.5 2.531 V
O
= 1 to 100 mA 2.45 2.55
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 2.814 2.85 2.885 V
O
= 1 to 100 mA 2.793 2.907
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 2.962 3 3.037 V
O
= 1 to 100 mA 2.94 3.06
I
O
IO= 1 to 100 mA TJ= -40 to 125°C
V
Output Voltage IO= 1 mA 3.16 3.2 3.24 V
O
= 1 to 100 mA 3.136 3.264
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 3.258 3.3 3.341 V
O
= 1 to 100 mA 3.234 3.366
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 3.555 3.6 3.645 V
O
= 1 to 100 mA 3.528 3.672
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 3.752 3.8 3.847 V
O
= 1 to 100 mA 3.724 3.876
I
O
= 1 to 100 mA TJ= -40 to 125°C
I
O
V
Output Voltage IO= 1 mA 3.95 4 4.05 V
O
= 1 to 100 mA 3.92 4.08
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 4.641 4.7 4.758 V
O
= 1 to 100 mA 4.606 4.794
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 4.789 4.85 4.91 V
O
= 1 to 100 mA 4.753 4.947
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
V
Output Voltage IO= 1 mA 4.937 5 5.062 V
O
= 1 to 100 mA 4.9 5.1
I
O
I
= 1 to 100 mA TJ= -40 to 125°C
O
1.445 1.555
1.737 1.863
2.412 2.587
2.75 2.949
2.895 3.105
3.088 3.312
3.184 3.415
3.474 3.726
3.667 3.933
3.86 4.14
4.535 4.864
4.68 5.019
4.825 5.175
6/17
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