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LD2981 Datasheet

VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT

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LD2981
® SERIES
VERY LOW DROP
VOLTAGE REGULATORS WITH INHIBIT
s ULTRA LOW DROPOUT VOLTAGE
(0.2V AT 100mA LOAD, 7mV AT 1mA LOAD)
s VERY LOW QUIESCENT CURRENT
(MAX 1µA WHEN IS IN SHUTDOWN MODE)
s OUTPUT CURRENT UP TO 100 mA
s LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
s OUTPUT VOLTAGES OF 2.85; 3.0; 3.2; 3.3;
3.8; 4.85; 5.0V
s INTERNAL CURRENT AND THERMAL LIMIT
s AVAILABLEIN ± 0.75% TOLLERANCE (AT
25oC, A VERSION)
s OUTPUT LOW NOISE VOLTAGE 160µVrms
s ONLY 4.7µF FOR STABILITY
s TEMPERATURE RANGE: -40 TO 125 oC
s SMALLEST PACKAGE SOT23-5L AND
SOT-89
s FAST DYNAMIC RESPONCE TO LINE AND
LOAD CHANGES
DESCRIPTION
The LD2981 series are 100mA fixed-output
voltage regulator. The ultra drop-voltage and the
ultra low quiescent current make them particularly
suitable for low noise, low power applications and
in battery powered systems.
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 as local regulator, it is possible 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), personal stereo,
camcorder and camera.
SCHEMATIC DIAGRAM
April 2000
1/12


STMicroelectronics Electronic Components Datasheet

LD2981 Datasheet

VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT

No Preview Available !

LD2981
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
VIN
VI NH
Io
Ptot
Tstg
Top
DC Input Voltage
INHBIT Input Voltage
Output Current
Power Dissipation
Storage Temperature Range
Operating Junction Temperature Range
THERMAL DATA
Symbol
Parameter
Rthj- ca se Thermal Resistance Junction-case
CONNECTION DIAGRAM (top view)
Value
16
16
Internally limited
Internally limited
- 55 to 150
- 40 to 125
Unit
V
V
mA
mW
oC
oC
SOT-89
15
SOT23-5L
81
Unit
oC/W
SOT23-5L
SOT-89
(*) 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
ORDERING NUMBERS
AB VERSION
SO T23-5L
SOT-89
LD2981ABM28TR
LD2981ABM30TR
LD2981ABM32TR
LD2981ABM33TR
LD2981ABM38TR
LD2981ABM48TR
LD2981ABM50TR
LD2981ABU28TR
LD2981ABU30TR
LD2981ABU32TR
LD2981ABU33TR
LD2981ABU38TR
LD2981ABU48TR
LD2981ABU50TR
C VERSION
S O T 23- 5L
SO T-89
LD2981CM28TR
LD2981CM30TR
LD2981CM32TR
LD2981CM33TR
LD2981CM38TR
LD2981CM48TR
LD2981CM50TR
LD2981CU28TR
LD2981CU30TR
LD2981CU32TR
LD2981CU33TR
LD2981CU38TR
LD2981CU48TR
LD2981CU50TR
Output Voltage
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


Part Number LD2981
Description VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT
Maker ST Microelectronics
Total Page 12 Pages
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