UNISONIC TECHNOLOGIES CO., LTD
LD2985 LINEAR INTEGRATED CIRCUIT
www.unisonic.com.tw 1 of 23
Copyright © 2010 Unisonic Technologies Co., Ltd QW-R102-024.G
VERY LOW DROP AND LOW
NOISE VOLTAGE REGULATOR
LOW ESR CAP. COMPATIBLE,
WITH INHIBIT FUNCTION
DESCRIPTION
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, CBYP=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 (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
* Low Output Noise Voltage 30μVrms
ORDERING INFORMATION
Ordering Number
Lead Free Plating Halogen Free Package Packing
LD2985L-xx-AF5-R LD2985G-xx-AF5-R SOT-25 Tape Reel
Note: xx: Output Voltage, refer to Marking Information.
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 2 of 23
www.unisonic.com.tw QW-R102-024.G
MARKING INFORMATION
PART NO. VOLTAGE VOLTAGE CODE MARKING
LD2985-1.5V 1.5V A5
LD2985-1.8V 1.8V A8
LD2985-2.5V 2.5V B5
LD2985-2.8V 2.8V B8
LD2985-2.85V 2.85V BJ
LD2985-3.0V 3.0V C0
LD2985-3.1V 3.1V C1
LD2985-3.2V 3.2V C2
LD2985-3.3V 3.3V C3
LD2985-3.5V 3.5V C5
LD2985-3.6V 3.6V C6
LD2985-3.8V 3.8V C8
LD2985-4.0V 4.0V D0
LD2985-4.7V 4.7V D7
LD2985-5.0V 5.0V E0
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO. PIN NAME DESCRIPTION
1 IN Input port
2 GND Ground pin
3 INHIBIT
Control switches 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
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 3 of 23
www.unisonic.com.tw QW-R102-024.G
BLOCK DIAGRAM
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 4 of 23
www.unisonic.com.tw QW-R102-024.G
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL RATINGS UNIT
DC Input Voltage ViN 16 V
INHIBIT Input Voltage VINH 16 V
Output Current IOUT Internally limited
Power Dissipation PD Internally limited
Operating Junction Temperature TOPR -20 ~ +125 °C
Storage Temperature TSTG -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 RATINGS UNIT
Junction to Case θJC 81 °C/W
ELECTRICAL CHARACTERISTICS
(TJ=25°C, VI N=VOUT+1V, IOUT=1mA, VSHDN=2V, CI =1μF, CO=1μF, unless otherwise specified)
FOR VOUT=1.5V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=2.5V 1.470 1.5 1.530 V
Output Voltage VOUT IOUT=1 ~ 150mA 1.455 1.545 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 5 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=1.8V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=2.8V 1.764 1.8 1.836 V
Output Voltage VOUT IOUT=1 ~ 150mA 1.746 1.854 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, Co=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IiNH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, Co=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 6 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=2.5V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=3.5V 2.450 2.5 2.550 V
Output Voltage VOUT IOUT=1 ~ 150mA 2.425 2.575 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, Co=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, Co=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 7 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=2.8V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=3.8V 2.744 2.8 2.856 V
Output Voltage VOUT IOUT=1 ~ 150mA 2.716 2.884 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, Co=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, Co=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 8 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=2.85V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=3.85V 2.793 2.85 2.907 V
Output Voltage VOUT IOUT=1 ~ 150mA 2.764 2.936 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 9 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=3.0V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=4.0V 2.940 3.0 3.060 V
Output Voltage VOUT IOUT=1 ~ 150mA 2.910 3.090 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 10 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=3.1V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=4.1V 3.038 3.1 3.162 V
Output Voltage VOUT IOUT=1 ~ 150mA 3.007 3.193 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 11 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=3.2V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=4.2V 3.136 3.2 3.264 V
Output Voltage VOUT IOUT=1 ~ 150mA 3.104 3.296 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 12 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=3.3V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=4.3V 3.234 3.3 3.366 V
Output Voltage VOUT IOUT=1 ~ 150mA 3.201 3.399 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 13 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=3.5V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=4.5V 3.430 3.5 3.570 V
Output Voltage VOUT IOUT=1 ~ 150mA 3.395 3.605 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 14 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=3.6V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=4.6V 3.528 3.6 3.672 V
Output Voltage VOUT IOUT=1 ~ 150mA 3.492 3.708 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 15 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=3.8V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=4.8V 3.724 3.8 3.876 V
Output Voltage VOUT IOUT=1 ~ 150mA 3.686 3.914 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 16 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=4.0V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=5.0V 3.920 4 4.080 V
Output Voltage VOUT IOUT=1 ~ 150mA 3.880 4.120 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
IOUT=1mA 30 mV
IOUT=10mA 87 mV
IOUT=50mA 175 mV
Dropout Voltage VD
IOUT=150mA 280 350 mV
IOUT=0 80 100 μA
IOUT=1mA 100 150 μA
IOUT=10mA 200 300 μA
IOUT=50mA 600 1050 μA
IOUT=150mA 2000 3000 μA
Quiescent Current IQ
OFF MODE VINH<0.18V 0 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 17 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=4.7V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=5.7V 4.606 4.7 4.794 V
Output Voltage VOUT IOUT=1 ~ 150mA 4.559 4.841 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 18 of 23
www.unisonic.com.tw QW-R102-024.G
ELECTRICAL CHARACTERISTICS(Cont.)
FOR VOUT=5.0V
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Input Voltage VI(OPR) 16 V
VIN=6.0V 4.900 5 5.100 V
Output Voltage VOUT IOUT=1 ~ 150mA 4.850 5.150 V
Short Circuit Current ISC R
L=0 400 mA
Line Regulation V△OUT V
IN=VOUT+1V ~ 16V, IOUT=1mA 30 mV
IOUT=0 1 3 mV
TJ=-20 ~ 125°C, IOUT =0 5 mV
IOUT=1mA 7 10 mV
IOUT=1mA, TJ=-20 ~ 125°C 15 mV
IOUT=10mA 40 60 mV
IOUT=10mA, TJ=-20 ~ 125°C 90 mV
IOUT=50mA 120 150 mV
IOUT=50mA, TJ=-20 ~ 125°C 225 mV
IOUT=150mA 280 350 mV
Dropout Voltage VD
IOUT=150mA, TJ=-20 ~ 125°C 575 mV
IOUT=0 80 100 μA
TJ=-20 ~ 125°C, IOUT=0 150 μA
IOUT=1mA 100 150 μA
IOUT=1mA, TJ=-20 ~ 125°C 200 μA
IOUT=10mA 200 300 μA
IOUT=10mA, TJ=-20 ~ 125°C 400 μA
IOUT=50mA 600 1050 μA
IOUT=50mA, TJ=-20 ~ 125°C 1200 μA
IOUT=150mA 2000 3000 μA
IOUT=150mA, TJ=-20 ~ 125°C 4000 μA
OFF MODE VINH<0.18V 0 μA
Quiescent Current IQ
OFF MODE VINH<0.18V
TJ=-20 ~ 125°C 2 μA
Supply Voltage Rejection SVR CBYP=0.01μF, CO=10μF, f=1KHz 45 dB
Control Input Logic Low VIL T
J=-20 ~ 125°C 0.15 V
Control Input Logic High VIH T
J=-20 ~ 125°C 2 V
TJ=-20 ~ 125°C, VSHDN=5V 5 15 μA
Control Input Current IINH TJ=-20 ~ 125°C, VSHDN=0V 0 -1 μA
Output Noise Voltage eN B=300Hz ~ 50KHz
CBYP=0.01μF, CO=10μF 30 μV
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 19 of 23
www.unisonic.com.tw QW-R102-024.G
REVERSE CURR EN T TEST CIRCUIT
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 20 of 23
www.unisonic.com.tw QW-R102-024.G
APPLICATION IN FORMATION
EXTERNAL CAPACITORS
Like any low-dropout regulator, the UTC LD2985 requires external capacitors for regulator stability. This
capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. We
suggest soldering input and outputting capacitors as close as possible to the relative pins.
INPUT CAPACITOR
An input capacitor whose value is 1μF is required with the UTC LD2985 (amount of capacitance can be
increased without limit). This capacitor must be located a distance of not more than 0.5" from the input pin of the
device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for
this capacitor.
OUTPUT CAPACITOR
The UTC LD2985 is designed specifically to work with ceramic output capacitors. It may also be possible to use
Tantalum capacitors, but these are not as attractive for reasons of size and cost. By the way, the output capacitor
must meet both the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value.
Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output
capacitor value, if low E.S.R. ceramic type is used, is 1μF for output voltages equal or major than 3.8V, 2.2μF for VO
going from 1.8 ~ 3.3V, and 3.3μF for the other versions. However, if an output capacitor lower than the suggested
one is used, it's possible to make stable the regulator adding a resistor in series to the capacitor.
IMPORTANT:
The output capacitor must maintain its ESR in the stable region over the full operating temperature to assure
stability. Also, capacitor tolerance and variation with temperature must be considered to assure the minimum amount
of capacitance is provided at all times. This capacitor should be located not more than 0.5" from the output pin of the
device and returned to a clean analog ground.
INHIBIT INPUT OPERATION
The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current
consumption down to less than 1μA. When the inhibit feature is not used, this pin must be tied to Vi to keep the
regulator output ON at all times. To assure proper operation, the signal source used to drive the inhibit pin must be
able to swing above and below the specified thresholds listed in the electrical characteristics section under VIH VIL.
Any slew rate can be used to drive the inhibit.
REVERSE CURRENT
The power transistor used in the UTC LD2985 has not an inherent diode connected between the regulator input
and output. If the output is forced above the input, no current will flow from the output to the input across the series
pass transistor. When a VREV voltage is applied on the output, the reverse current measured flows to the GND
across the two feedback resistors. This current typical value is 160μA. R1 and R2 resistors are implanted type; typical
values are, respectively, 42.6KΩ and 51.150KΩ.
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 21 of 23
www.unisonic.com.tw QW-R102-024.G
TYPICAL CHARACTERISTICS (TJ=25°C, CI=1μF, CO=2.2μF, CBYP=100nF)
2.58
-25-50 25
0
2.46
2.50
2.56
75
2.54
2.48
2.44
50 100
Output Voltage vs Temperature
2.52
Tc (°C)
2.42
2.40
Output Voltage, VOUT (V)
VIN=3.5V
IOUT=1mA
2000
25075
50
400
1600
125
1200
100 150
Quiescent Current vs Load Current
800
Output Current, IOUT (mA)
0
Quiescent Current, IQ(μA)
VOUT=2.5V
Cby=10nF
125
2.60
175
-25-50 25
0
0.2
0.3
75
0.1
50 100
Dropout Voltage vs Temperature
0
Dropout Voltage, VD(V)
VOUT=2.5V
Cby=10nF
IOUT=150mA
IOUT=50mA
IOUT=10mA
IOUT=1mA
-25-50 25
0
2.0
3.5
75
1.5
50 100
Quiescent Current vs Temperature
0
Quiescent Current, IQ(mA)
VOUT=2.5V
Cby=10nF
IOUT=150mA
3.0
2.5
1.0
0.5
Tc (°C) Tc (°C)
125
25075
50
100
150
250
125
200
100 150
Dropout Voltage vs Output Current
Output Current, IOUT (mA)
50
0
Dropout Voltage, VD(mV)
VOUT=2.5V
-25-50 25
0
60
90
75
50
50 100
Supply Voltage Rejection vs Temperature
20
Supply Voltage Rejection, SVR (dB)
Co=10μF
80
70
40
30
Co=1μF
fosc=1KHz
VIN=3.5 ~ 6.5V
IOUT=10mA
Tc (°C)
125
175
0.4
125
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 22 of 23
www.unisonic.com.tw QW-R102-024.G
TYPICAL CHARACTERISTICS(Cont.) (TJ=25°C, CI=1μF, CO=2.2μF, CBYP=100nF)
80
25075
50
60
125
40
100 150
Supply Voltage Rejection vs Output Current
20
Output Current, IOUT (mA)
0
Supply Voltage Rejection, SVR (dB)
VIN=3.5 ~ 6.5V
CO=10μF
fosc=1KHz
70
60
40
Supply Voltage Rejection vs Frequency
20
Frequency, f (KHz)
0
Supply Voltage Rejection, SVR (dB)
50
30
10
10
1102103104
VIN=3.5 ~ 6.5V
IOUT=10mA
VOUT=2.5V
CO=1μF
80
25075
50
60
125
40
100 150
Supply Voltage Rejection vs Output Current
20
Output Current, IOUT (mA)
0
VIN=3.5 ~ 6.5V
CO=1μF
fosc=1KHz
Line Transient
VIN
VOUT
VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7μF, tr=tf=20ns
Ch1 500mV 20.0mV
CH2 M 10.0μsCh1 3.96V
Ch2
1
1
100
175
Supply Voltage Rejection, SVR (dB)
100
175
80
105
Line Transient
VIN
VOUT
VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7μF, tr=tf=1μs
500mV 20.0mV
CH2 M 10.0μsCh1 3.96V
1
Ch1 Ch2
2
Frequency, f (KHz)
70
60
40
Supply Voltage Rejection vs Frequency
20
0
Supply Voltage Rejection, SVR (dB)
50
30
10
10
1102103104
VIN=2.8 ~ 5.8V
IOUT=10mA
VOUT=1.8V
CO=10μF
105
Tek Run:5.00MS/s
Tek Run:5.00MS/s
LD2985 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 23 of 23
www.unisonic.com.tw QW-R102-024.G
TYPICAL CHARACTERISTICS(Cont.) (TJ=25°C, CI=1μF, CO=2.2μF, CBYP=100nF)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
