UTC LD1985
LINEAR INTEGRATED CIRCUIT
VERY LOW DROP AND LOW
NOISE VOLTAGE REGULATOR
LOW ESR CAP. COMPATIBLE,
WITH INHIBIT FUNCTION
DESCRIPTION
The UTC LD1985 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 is pulled low. Shutdown Logic
Control Function is available on pin 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.
An external capacitor, C
BYP
=10nF, connected between
bypass pin and GND reduce the noise to 30μVrms.
Typical application are in cellular phone, palmtop
laptop computer, personal digital assistant (PDA),
personal stereo, camcorder and camera.
2
3
1
5
4
SOT-25
1:V
IN
4:Bypass
2:GND
5:V
OUT
3:INHIBIT
FEATURES
*VERY LOW DROPOUT VOLTAGE (280mV at 150mA
AND 7mV at 1mA LOAD)
*VERY LOW QUIESCENT CURRENT (2mA Typ. at
150mA LOAD AND 80μA at NO LOAD)
*OUTPUT CURRENT UP TO 150mA
*LOGIC CONTROLLED 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 (at 25℃, A
VERSION)
*LOW OUTPUT NOISE VOLTAGE 30μVrms
PIN DESCRIPTION
PIN
NO.
1
2
PIN
NAME
IN
GND
FUNCTION
3
4
5
Input Port
Ground Pin
Control switch ON/OFF.
Inhibit is not internally
pulled-up; it cannot be left
INHIBIT floating. Disable the device
when connected to GND or
to a positive voltage less
than 0.18V
Bypass Pin: Capacitor to
be connected to GND in
Bypass order to improve the
thermal noise
performances.
OUT Output Port
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R102-021,B
UTC LD1985
MARKING INFORMATION
PART
NUMBER
LD1985-1.5V
LD1985-1.8V
LD1985-2.5V
LD1985-2.8V
LD1985-2.85V
LD1985-3.0V
LD1985-3.1V
LD1985-3.2V
LINEAR INTEGRATED CIRCUIT
VOLTAGE
CODE
15
18
25
28
2J
30
31
32
VOLTAGE
1.5V
1.8V
2.5V
2.8V
2.85V
3.0V
3.1V
3.2V
PART
NUMBER
LD1985-3.3V
LD1985-3.5V
LD1985-3.6V
LD1985-3.8V
LD1985-4.0V
LD1985-4.7V
LD1985-5.0V
VOLTAGE
3.3V
3.5V
3.6V
3.8V
4.0V
4.7V
5.0V
VOLTAGE
CODE
33
35
36
38
40
47
50
3
2
MARKING
1
LD
VOLTAGE
CODE
4
5
BLOCK DIAGRAM
Vin
CURRENT
LIMIT
Vout
SHDN
START-UP
SHUTDOWN
REFERENCE
VOLTAGE
ERROR
AMPLIFIER
DRIVER
BYPASS
TERM. PROTEC.
GND
ABSOLUTE MAXIMUM RATINGS
PARAMETER
DC Input Voltage
INHIBIT Input Voltage
Output Current
Power Dissipation
Storage Temperature Range
Operating Junction Temperature Range
SYMBOL
V
i
V
INH
I
o
P
tot
T
stg
T
op
RATINGS
7
7
Internally limited
Internally limited
-65 ~ +150
-40 ~ +125
UNIT
V
V
℃
℃
THERMAL DATA
PARAMETER
Thermal Resistance Junction-case
SYMBOL
R
thj-case
RATINGS
81
UNIT
℃/W
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R102-021,B
UTC LD1985
PARAMETER
Operating Input Voltage
Output Voltage
LINEAR INTEGRATED CIRCUIT
SYMBOL
Vop
Vo
ELECTRICAL CHARACTERISTICS FOR LD1985 V
O
±1.0%
(T
J
=25℃, V
i
=Vo+1V, Io=1mA, V
SHDN
=2V, C
i
=1μF, Co=1μF, unless otherwise specified)
TEST CONDITIONS
V
i
=2.5V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=2.8V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=3.5V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
MIN
2.5
1.485
1.462
1.447
1.782
1.755
1.737
2.475
2.4375
2.4125
2.772
2.730
2.702
2.821
2.778
2.750
2.970
2.925
2.895
3.069
3.022
2.9915
3.168
3.120
3.088
3.267
3.2175
3.1845
3.465
3.412
3.377
3.564
3.510
3.474
3.762
3.705
3.667
3.96
3.9
3.86
4.653
4.582
4.5355
4.95
4.875
4.825
TYP
1.5
MAX
7
1.515
1.538
1.553
1.818
1.845
1.863
2.525
2.5625
2.5875
2.828
2.870
2.898
2.879
2.921
2.950
3.030
3.075
3.105
3.131
3.1775
3.2085
3.232
3.280
3.312
3.333
3.3825
3.4155
3.535
3.587
3.622
3.636
3.690
3.726
3.838
3.895
3.933
4.04
4.1
4.14
4.747
4.817
4.8645
5.05
5.125
5.175
UNIT
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
V
V
V
V
V
V
V
V
V
V
V
V
V
Output Voltage
Vo
1.8
Output Voltage
Vo
2.5
Output Voltage
Vo
V
i
=3.8V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=3.85V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.0V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.1V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.2V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.3V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.5V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.6V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.8V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=5.0V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=5.7V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=6.0V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
2.8
Output Voltage
Vo
2.85
Output Voltage
Vo
3.0
Output Voltage
Vo
3.1
Output Voltage
Vo
3.2
Output Voltage
Vo
3.3
Output Voltage
Vo
3.5
Output Voltage
Vo
3.6
Output Voltage
Vo
3.8
Output Voltage
Vo
4
Output Voltage
Vo
4.7
Output Voltage
Vo
5
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R102-021,B
UTC LD1985
PARAMETER
Short Circuit Current
Line Regulation
LINEAR INTEGRATED CIRCUIT
SYMBOL
Isc
△Vo/△V
i
TEST CONDITIONS
R
L
=0
V
i
=Vo+1V ~ 16V, Io=1mA
V
i
=Vo+1V ~ 16V, Io=1mA
T
J
=-40 ~ 125℃
MIN
TYP
400
0.003
MAX
0.014
0.032
UNIT
mA
%/V
i
%/V
i
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
dB
V
V
μA
μA
μV
Dropout Voltage
V
d
Io=0
T
J
=-40 ~ 125℃, Io=0
Io=1mA
Io=1mA, T
J
=-40 ~ 125℃
Io=10mA
Io=10mA, T
J
=-40 ~ 125℃
Io=50mA
Io=50mA, T
J
=-40 ~ 125℃
Io=150mA
Io=150mA, T
J
=-40 ~ 125℃
1
7
40
120
280
80
100
200
600
2000
0
3
5
10
15
60
90
150
225
350
575
100
150
150
200
300
400
900
1200
3000
4000
2
Quiescent Current
I
d
Io=0
T
J
=-40 ~ 125℃, Io=0
Io=1mA
Io=1mA, T
J
=-40 ~ 125℃
Io=10mA
Io=10mA, T
J
=-40 ~ 125℃
Io=50mA
Io=50mA, T
J
=-40 ~ 125℃
Io=150mA
Io=150mA, T
J
=-40 ~ 125℃
OFF MODE V
INH
<0.18V
OFF MODE V
INH
<0.18V
T
J
=-40 ~ 125℃
C
BYP
=0.01μF, Co=10μF, f=1KHz
T
J
=-40 ~ 125℃
T
J
=-40 ~ 125℃
T
J
=-40 ~ 125℃, V
SHDN
=5V
T
J
=-40 ~ 125℃, V
SHDN
=0V
B=300Hz ~ 50KHz
C
BYP
=0.01μF, Co=10μF
Supply Voltage Rejection
Control Input Logic Low
Control Input Logic High
Control Input Current
Output Noise Voltage
SVR
V
IL
V
IH
I
iNH
eN
45
0.15
2
5
0
30
15
-1
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R102-021,B
UTC LD1985
PARAMETER
Operating Input Voltage
Output Voltage
LINEAR INTEGRATED CIRCUIT
SYMBOL
Vop
Vo
V
i
=2.5V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=2.8V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=3.5V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=3.8V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=3.85V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.0V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.1V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.2V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.3V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.5V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.6V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=4.8V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=5.0V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=5.7V
Io=1 ~ 150mA
Io=1 ~ 150mA, T
J
=-40 ~ 125℃
V
i
=6.0V
Io=1 ~ 150mA
ELECTRICAL CHARACTERISTICS FOR LD1985 V
O
±1.5%
(T
J
=25℃, V
i
=Vo+1V, Io=1mA, V
SHDN
=2V, C
i
=1μF, Co=1μF, unless otherwise specified)
TEST CONDITIONS
MIN
2.5
1.477
1.455
1.440
1.773
1.746
1.728
2.4625
2.425
2.4
2.758
2.716
2.688
2.807
2.764
2.736
2.955
2.91
2.88
3.0535
3.007
2.976
3.152
3.104
3.072
3.2505
3.201
3.168
3.447
3.395
3.360
3.546
3.492
3.456
3.743
3.686
3.648
3.94
3.88
3.84
4.6295
4.559
4.512
4.925
4.85
TYP
1.5
MAX
7
1.523
1.545
1.560
1.827
1.854
1.872
2.5375
2.575
2.6
2.842
2.884
2.912
2.893
2.935
2.964
3.045
3.09
3.12
3.1465
3.193
3.224
3.248
3.296
3.328
3.3495
3.399
3.432
3.552
3.605
3.640
3.654
3.708
3.744
3.857
3.914
3.952
4.06
4.12
4.16
4.7705
4.841
4.888
5.075
5.15
UNIT
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
V
V
V
V
V
V
V
V
V
V
V
V
Output Voltage
Vo
Output Voltage
Vo
Output Voltage
Vo
1.8
2.5
2.8
Output Voltage
Vo
2.85
Output Voltage
Vo
3.0
Output Voltage
Vo
3.1
Output Voltage
Vo
3.2
Output Voltage
Vo
3.3
Output Voltage
Vo
3.5
Output Voltage
Vo
3.6
Output Voltage
Vo
3.8
Output Voltage
Vo
4
Output Voltage
Vo
4.7
Output Voltage
Vo
5
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R102-021,B
