LD2981
SERIES
ULTRA LOW DROP VOLTAGE REGULATORS WITH INHIBIT
LOW ESR OUTPUT CAPACITORS COMPATIBLE
s
s
s
s
s
s
s
s
s
s
s
s
STABLE WITH LOW ESR CERAMIC
CAPACITORS
ULTRA LOW DROPOUT VOLTAGE (0.17V
TYP. AT 100mA LOAD, 7mV TYP. AT 1mA
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 160µVRMS
TEMPERATURE RANGE: -40 TO 125°C
SMALLEST PACKAGE SOT23-5L AND
SOT-89
FAST DYNAMIC RESPONSE TO LINE AND
LOAD CHANGES
SOT23-5L
SOT-89
DESCRIPTION
The LD2981 series are 100mA fixed-output
voltage regulator. The low drop-voltage and the
SCHEMATIC DIAGRAM
ultra low 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 consumption. The LD2981 is designed to
work with low ESR ceramic capacitor. Typical
applications are in cellular phone, palmtop/laptop
computer, personal digital assistant (PDA),
personal stereo, camcorder and camera.
March 2003
1/17
LD2981 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
V
I
V
INH
I
O
P
D
T
STG
T
OP
DC Input Voltage
INHIBIT Input Voltage
Output Current
Power Dissipation
Storage Temperature Range
Operating Junction Temperature Range
Parameter
Value
-0.3 to 16
-0.3 to 16
Internally limited
Internally limited
-55 to 150
-40 to 125
°C
°C
Unit
V
V
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
R
thj-amb
Parameter
Thermal Resistance Junction-ambient
SOT23-5L
81
255
SOT-89
15
110
Unit
°C/W
°C/W
R
thj-case
Thermal Resistance Junction-case
CONNECTION DIAGRAM
(top view)
SOT23-5L
SOT-89
PIN DESCRIPTION
Pin N°
SOT23-5L
1
2
3
Pin N°
SOT-89
3
2
Symbol
V
IN
GND
INHIBIT
Input Port
Ground Pin
Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be
left floating. Disable the device when connected to GND or to a
positive voltage less than 0.18V
Not Connected
Output Port
Name and Function
4
5
1
NC
V
OUT
2/17
LD2981 SERIES
ORDERING CODES
AB VERSION
SOT23-5L
LD2981ABM15TR
LD2981ABM18TR
LD2981ABM25TR
LD2981ABM28TR
LD2981ABM30TR
LD2981ABM32TR
LD2981ABM33TR
LD2981ABM36TR
LD2981ABM38TR
LD2981ABM40TR
LD2981ABM47TR
LD2981ABM48TR
LD2981ABM50TR
SOT-89
LD2981ABU15TR
LD2981ABU18TR
LD2981ABU25TR
LD2981ABU28TR
LD2981ABU30TR
LD2981ABU32TR
LD2981ABU33TR
LD2981ABU36TR
LD2981ABU38TR
LD2981ABU40TR
LD2981ABU47TR
LD2981ABU48TR
LD2981ABU50TR
SOT23-5L
LD2981CM15TR
LD2981CM18TR
LD2981CM25TR
LD2981CM28TR
LD2981CM30TR
LD2981CM32TR
LD2981CM33TR
LD2981CM36TR
LD2981CM38TR
LD2981CM40TR
LD2981CM47TR
LD2981CM48TR
LD2981CM50TR
C VERSION
SOT-89
LD2981CU15TR
LD2981CU18TR
LD2981CU25TR
LD2981CU28TR
LD2981CU30TR
LD2981CU32TR
LD2981CU33TR
LD2981CU36TR
LD2981CU38TR
LD2981CU40TR
LD2981CU47TR
LD2981CU48TR
LD2981CU50TR
OUTPUT
VOLTAGES
1.5 V
1.8 V
2.5 V
2.85 V
3.0 V
3.2 V
3.3 V
3.6 V
3.8 V
4.0 V
4.7 V
4.85 V
5.0 V
TYPICAL APPLICATION CIRCUIT
(*) 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
(T
j
= 25°C, V
I
= V
O(NOM)
+1V, C
I
= 1µF(X7R),
C
O
= 2.2µF(X7R), I
O
= 1mA, V
INH
= 2V, unless otherwise specified)
Symbol
V
OP
V
O
Parameter
Operating Input Voltage
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
V
O
Output Voltage
I
O
= 1 mA
I
O
= 1 to 100 mA
I
O
= 1 to 100 mA
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
Test Conditions
Min.
2.5
1.488
1.485
1.462
1.786
1.782
1.755
2.481
2.475
2.437
2.828
2.822
2.779
2.977
2.970
2.925
3.176
3.168
3.12
3.275
3.267
3.217
3.573
3.564
3.510
3.771
3.762
3.705
3.97
3.96
3.9
4.664
4.653
4.582
4.813
4.801
4.729
4.962
4.950
4.875
5
4.85
4.7
4
3.8
3.6
3.3
3.2
3
2.85
2.5
1.8
1.5
Typ.
Max.
16
1.511
1.515
1.537
1.813
1.818
1.845
2.518
2.525
2.562
2.872
2.878
2.921
3.023
3.030
3.075
3.224
3.232
3.28
3.325
3.333
3.383
3.627
3.636
3.690
3.829
3.838
3.895
4.03
4.04
4.1
4.735
4.747
4.817
4.887
4.899
4.971
5.038
5.050
5.125
V
V
V
V
V
V
V
V
V
V
V
V
Unit
V
V
4/17
LD2981 SERIES
Symbol
∆V
O
I
Q
Parameter
Line Regulation
Quiescent Current
ON MODE
Test Conditions
V
O(NOM)
+ 1 < V
IN
< 16 V I
O
= 1 mA
T
J
= -40 to 125
°C
I
O
= 0
I
O
= 0
I
O
= 1 mA
I
O
= 1 mA
I
O
= 25 mA
I
O
= 25 mA
I
O
= 100 mA
I
O
= 100 mA
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
Min.
Typ.
0.003
80
100
250
1000
Max.
0.014
0.032
100
150
150
200
400
800
1300
2600
0.8
2
Unit
%/V
µA
OFF MODE
V
DROP
Dropout Voltage (NOTE 1)
V
INH
< 0.3 V
V
INH
< 0.15 V
I
O
= 0
I
O
= 0
I
O
= 1mA
I
O
= 1mA
I
O
= 25mA
I
O
= 25mA
I
O
= 100mA
I
O
= 100mA
T
J
= -40 to 125
°C
150
f = 1KHz
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
1.6
0
5
160
170
300
63
T
J
= -40 to 125
°C
180
T
J
= -40 to 125
°C
70
T
J
= -40 to 125
°C
7
1
3
5
10
15
100
150
250
375
mV
I
SC
SVR
V
INH
V
INL
I
INH
e
N
T
SHDN
Short Circuit Current
Supply Voltage Rejection
Inhibit Input Logic Low
Inhibit Input Logic High
Inhibit Input Current
R
L
= 0
C
O
= 10µF
LOW = Output OFF
HIGH = Output ON
V
INH
= 0V
V
INH
= 5V
mA
dB
0.18
V
V
-1
15
µV
RMS
°C
µA
T
J
= -40 to 125
°C
T
J
= -40 to 125
°C
C
O
= 10
µF
Output Noise Voltage
Thermal Shutdown
B
W
= 300 Hz to 50 KHz
(NOTE 1): For Vo < 2.5V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
5/17
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