UNISONIC TECHNOLOGIES CO., LTD
LD2985
VERY LOW DROP AND LOW
NOISE VOLTAGE REGULATOR
LOW ESR CAP. COMPATIBLE,
WITH INHIBIT FUNCTION
DESCRIPTION
LINEAR INTEGRATED CIRCUIT
The UTC
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 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 applications are in cellular phone, palmtop laptop
computer, personal digital assistant (PDA), personal stereo,
camcorder and camera.
FEATURES
* Very Low Dropout Voltage (280mV at 150mA and 7mV at 1mA load)
* Very Low Quiescent current
* 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
* Low Output Noise Voltage 30μVrms
ORDERING INFORMATION
Package
SOT-25
Packing
Tape Reel
Ordering Number
Lead Free
Halogen Free
LD2985L-xx-AF5-R
LD2985G-xx-AF5-R
Note: xx: Output Voltage, refer to Marking Information.
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Copyright © 2013 Unisonic Technologies Co., Ltd
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QW-R102-024.I
LD2985
MARKING INFORMATION
PACKAGE
VOLTAGE
1.5V
1.8V
2.5V
2.8V
2.85V
3.0V
3.1V
3.2V
3.3V
3.5V
3.6V
3.8V
4.0V
4.7V
5.0V
VOLTAGE CODE
A5
A8
B5
B8
BJ
C0
C1
C2
C3
C5
C6
C8
D0
D7
E0
LINEAR INTEGRATED CIRCUIT
MARKING
SOT-25
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
PIN NAME
DESCRIPTION
IN
Input port
GND
Ground pin
Control switches ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating.
INHIBIT
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 order to improve the thermal noise
Bypass
performances.
OUT
Output port
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LD2985
ABSOLUTE MAXIMUM RATINGS
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
RATINGS
UNIT
DC Input Voltage
V
iN
16
V
INHIBIT Input Voltage
V
INH
16
V
Output Current
I
OUT
Internally limited
Power Dissipation
P
D
Internally limited
Operating Junction Temperature
T
OPR
-40 ~ +85
°C
Storage Temperature
T
STG
-40 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
SYMBOL
θ
JC
RATINGS
81
UNIT
°C/W
Junction to Case
ELECTRICAL CHARACTERISTICS
(T
J
=25°C, V
I N
=V
OUT
+1V, I
OUT
=1mA, V
SHDN
=2V, C
I
=1μF, C
O
=1μF, unless otherwise specified)
FOR V
OUT
=1.5V
PARAMETER
Operating Input Voltage
Output Voltage
Short Circuit Current
Line Regulation
SYMBOL
V
I(OPR)
V
OUT
I
SC
△
V
OUT
TEST CONDITIONS
V
IN
=2.5V
I
OUT
=1 ~ 150mA
R
L
=0
V
IN
=V
OUT
+1V ~ 16V, I
OUT
=1mA
I
OUT
=0
I
OUT
=1mA
I
OUT
=10mA
I
OUT
=50mA
I
OUT
=150mA
I
OUT
=0
I
OUT
=1mA
I
OUT
=10mA
I
OUT
=50mA
I
OUT
=150mA
OFF MODE V
INH
<0.18V
C
BYP
=0.01μF, C
O
=10μF, f=1KHz
T
J
=-20 ~ 125°C
T
J
=-20 ~ 125°C
T
J
=-20 ~ 125°C, V
SHDN
=5V
T
J
=-20 ~ 125°C, V
SHDN
=0V
B=300Hz ~ 50KHz,
C
BYP
=0.01μF, C
O
=10μF
MIN
1.470
1.455
TYP
1.5
600
1
7
40
120
280
80
100
280
1050
2900
1.5
45
2
5
0
30
15
-1
30
3
10
60
150
350
100
150
330
1300
3300
MAX
16
1.530
1.545
UNIT
V
V
V
mA
mV
mV
mV
mV
mV
mV
μA
μA
μA
μA
μA
μA
dB
V
V
μA
μA
μV
Dropout Voltage
V
D
Quiescent Current
I
Q
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
0.15
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www.unisonic.com.tw
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