UNISONIC TECHNOLOGIES CO., LTD LD2985
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.
LINEAR INTEGRATED CIRCUIT
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 LD2985L-xx-AF5-R LD2985G-xx-AF5-R Note: xx: Output Voltage, refer to Marking Information. Package SOT-25 Packing Tape Reel
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QW-R102-024.G
LD2985
MARKING INFORMATION
PART NO. LD2985-1.5V LD2985-1.8V LD2985-2.5V LD2985-2.8V LD2985-2.85V LD2985-3.0V LD2985-3.1V LD2985-3.2V LD2985-3.3V LD2985-3.5V LD2985-3.6V LD2985-3.8V LD2985-4.0V LD2985-4.7V LD2985-5.0V 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
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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R102-024.G
LD2985
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 23
QW-R102-024.G
LD2985
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
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 -40 ~ +85 Operating Junction Temperature TOPR °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 Junction to Case SYMBOL θJC RATINGS 81 UNIT °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 Operating Input Voltage VI(OPR) VIN=2.5V 1.470 1.5 Output Voltage VOUT 1.455 IOUT=1 ~ 150mA Short Circuit Current ISC RL=0 400 Line Regulation △VOUT VIN=VOUT+1V ~ 16V, IOUT=1mA IOUT=0 1 TJ=-20 ~ 125°C, IOUT =0 IOUT=1mA 7 IOUT=1mA, TJ=-20 ~ 125°C IOUT=10mA 40 Dropout Voltage VD IOUT=10mA, TJ=-20 ~ 125°C IOUT=50mA 120 IOUT=50mA, TJ=-20 ~ 125°C IOUT=150mA 280 IOUT=150mA, TJ=-20 ~ 125°C IOUT=0 80 TJ=-20 ~ 125°C, IOUT=0 IOUT=1mA 100 IOUT=1mA, TJ=-20 ~ 125°C IOUT=10mA 200 IOUT=10mA, TJ=-20 ~ 125°C Quiescent Current IQ IOUT=50mA 600 IOUT=50mA, TJ=-20 ~ 125°C IOUT=150mA 2000 IOUT=150mA, TJ=-20 ~ 125°C OFF MODE VINH
