SGS Thomson Microelectronics LD2985BM33R, LD2985BM32R, LD2985BM31R, LD2985BM30R, LD2985BM28R Datasheet
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LD2985
SERIES
VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR
LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION
■ VERY LOW DRO PO UT VOLTAGE (280mV
AT 150mA AND 7mV AT 1mA LOAD)
■ VERY LOW QUIESCENT CURRE NT (2mA
TYP. AT 150mA LOAD AND 80µAATNO
LOAD)
■ OUTPUT CURRENT UP TO 150mA
■ LOGIC C ONTROLLED ELECTRONIC
SHUTDOWN
■ OUTPUT VOLTAGE OF 1.5, 1.8,2.5, 2.8,
2.85,3,3.1,3.2,3.3,3.5,3.6,3.8,4,4.7,5V
■ INTERNAL CURRENT AND THERMAL LIMIT
■ AVAILABLE IN ± 1% TOLLERANCE (AT25°C,
AVERSION)
■ LOW OUTPUT NOISE VOLTAGE 30µVrms
■ SMALLEST PACKAGESOT23-5L
■ TEMPERATURE RAN GE : -40°C TO 125°C
DESCRIPTION
The LD2985 is a 150mA fixed output voltage
regulator. The ultra low drop voltage and the low
quiescent current make them particularly suitable
for low noise , low power applications , and in
battery powered systems. In sleep mode
quiescent current is less than 1µA when INHIBIT
pin i s pulled low. Shut down Logic Control F unc tion
is av ailable on pin 3 (TTL c ompatible). This means
that when t he device is used as local regulator, it
is possible to put a part of the board in standby,
decreasing the total power consumption.
An external capacitor, C
between bypass pin and GND reduce the noise
to 30µV rms.
Typical application are in cellular phone, palmtop
laptop computer, personal digital assistant (PDA),
personal stereo, ca mcorder and camera.
SOT23-5L
BYP
=10nF, connected
SCHEMATIC DIAGRAM
1/13July 2003
LD2985 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
INH
I
P
T
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 Unit
R
thj-case
CONNECTION DIAGRAM (top view) PIN DESCRIPTION
DC Input Voltage
I
INHIBIT Input Voltage
Output Current
O
Power Dissipation
tot
Storage Temperature Range
stg
Operating Junction Temperature Range
op
Thermal Resistance Junction-case
SOT23-5L
16 V
16 V
Internally limited
Internally limited
-65 to +150 °C
-40 to +125 °C
81 °C/W
Pin N° Symbol Name and Function
1 IN Input Port
2 GND Ground Pin
3 INHIBIT 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
4 Bypass Bypass Pin: Capacitor to be
connected to GND in order to
improve the thermal noise
performances.
5 OUT Output Port
ORDERING CODES
A VERSION B VERSION OUTPUT VOLTAGES
LD2985AM15R LD2985BM15R 1.5V
LD2985AM18R LD2985BM18R 1.8V
LD2985AM25R LD2985BM25R 2.5V
LD2985AM28R LD2985BM28R 2.8V
LD2985AM285R LD2985BM285R 2.85V
LD2985AM30R LD2985BM30R 3.0V
LD2985AM31R LD2985BM31R 3.1V
LD2985AM32R LD2985BM32R 3.2V
LD2985AM33R LD2985BM33R 3.3V
LD2985AM35R LD2985BM35R 3.5V
LD2985AM36R LD2985BM36R 3.6V
LD2985AM38R LD2985BM38R 3.8V
LD2985AM40R LD2985BM40R 4.0V
LD2985AM47R LD2985BM47R 4.7V
LD2985AM50R LD2985BM50R 5.0V
2/13
LD2985 SE RIE S
ELECTRICAL CHARACTERISTICS FOR LD2985A (TJ= 25°C, VI=VO+1V, IO=1mA, V
C
=1µF, CO=1µF, unless otherwise s pec ified)
I
SHDN
=2V,
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Operating Input Voltage 2.5 16 V
Op
Output Voltage VI= 2.5V 1.485 1.5 1.515 V
V
O
= 1 to 50mA 1.462 1.538 V
I
O
I
=1to50mA TJ= -40 to 125°C
O
V
Output Voltage VI= 2.8V 1.782 1.8 1.818
O
= 1 to 150mA 1.755 1.845
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 3.5V 2.475 2.5 2.525
O
= 1 to 150mA 2.4375 2.5625
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 3.8V 2.772 2.8 2.828
O
= 1 to 150mA 2.730 2.870
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 3.85V 2.821 2.85 2.879 V
O
= 1 to 50mA 2.778 2.921 V
I
O
IO=1to50mA TJ= -40 to 125°C
V
Output Voltage VI= 4.0V 2.970 3.0 3.030
O
= 1 to 150mA 2.925 3.075
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 4.1V 3.069 3.1 3.131
O
= 1 to 150mA 3.022 3.1775
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 4.2V 3.168 3.2 3.232
O
= 1 to 150mA 3.120 3.280
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 4.3V 3.267 3.3 3.333
O
= 1 to 150mA 3.2175 3.3825
I
O
= 1 to 150mA TJ= -40 to 125°C
I
O
V
Output Voltage VI= 4.5V 3.465 3.5 3.535
O
= 1 to 150mA 3.412 3.587
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 4.6V 3.564 3.6 3.636
O
= 1 to 150mA 3.510 3.690
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 4.8V 3.762 3.8 3.838
O
= 1 to 150mA 3.705 3.895
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 5.0V 3.96 4 4.04
O
= 1 to 150mA 3.9 4.1
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
1.447 1.553 V
1.737 1.863
2.4125 2.5875
2.702 2.898
2.750 2.950 V
2.895 3.105
2.9915 3.2085
3.088 3.312
3.1845 3.4155
3.377 3.622
3.474 3.726
3.667 3.933
3.86 4.14
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
3/13
LD2985 SERIES
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
Output Voltage VI= 5.7V 4.653 4.7 4.747
O
= 1 to 150mA 4.582 4.817
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
V
Output Voltage VI= 6.0V 4.95 5 5.05
O
= 1 to 150mA 4.875 5.125
I
O
I
= 1 to 150mA TJ= -40 to 125°C
O
I
Short Circuit Current RL= 0 400 mA
SC
/∆VILine Regulation VI=VO+1V to 16V, IO= 1mA 0.003 0.014 %/V
∆V
O
VI=VO+1V to 16V, IO= 1mA
= -40 to 125°C
T
J
V
Dropout Voltage IO=0 1 3 mV
d
I
=0 TJ= -40 to 125°C
O
I
=1mA 7 10 mV
O
I
=1mA TJ= -40 to 125°C
O
I
= 10mA 40 60 mV
O
I
= 10mA TJ= -40 to 125°C
O
I
= 50mA 120 150 mV
O
I
= 50mA TJ= -40 to 125°C
O
I
= 150mA 280 350 mV
O
I
= 150mA TJ= -40 to 125°C
O
I
Quiescent Current IO= 0 80 100 µA
d
I
=0 TJ= -40 to 125°C
O
I
= 1mA 100 150 µA
O
I
=1mA TJ= -40 to 125°C
O
I
= 10mA 200 300 µA
O
I
= 10mA TJ= -40 to 125°C
O
I
= 50mA 600 900 µA
O
I
= 50mA TJ= -40 to 125°C
O
I
= 150mA 2000 3000 µA
O
I
= 150mA TJ= -40 to 125°C
O
SVR Supply Voltage Rejection C
Control Input Logic Low
V
IL
V
Control Input Logic High
IH
I
Control Input Current
iNH
OFF MODE V
OFF MODE V
T
= -40 to 125°C
J
= 0.01µFCO=10µF f = 1KHz 45 dB
BYP
T
= -40 to 125°C
J
T
= -40 to 125°C
J
T
= -40 to 125°C V
J
= -40 to 125°C V
T
J
<0.18V 0 µA
INH
<0.18V
INH
=5V
SHDN
=0V
SHDN
eN Output Noise Voltage B= 300Hz to 50KHz
= 0.01µFC
C
BYP
=10µF
O
4.5355 4.8645
4.825 5.175
0.032 %/V
5mV
15 mV
90 mV
225 mV
575 mV
150 µA
200 µA
400 µA
1200 µA
4000 µA
2 µA
0.15 V
2V
515µA
0-1µA
30 µV
V
V
V
V
V
V
I
I
4/13
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