UNISONIC TECHNOLOGIES CO., LTD LR18120
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1 UNISONIC TECHNOLOGIES CO., LTD LR1812 2A LOW DROPOUT REGULATOR WITH ENABLE DESCRIPTION The UTC LR1812 is a positive voltage regulator with high performance. It has low dropout voltage and low input voltage, besides its output voltage can be fixed at 1.V, 1.2V, 1.5V, 1.8V, or 2.5V depending on internal feedback resistors or ADJ (not connected to the ground) with external feedback resistors. The input voltage of UTC LR1812 can be low to 1.4V. There are two additional pin in the LR1812. One is EN pin and the other is POK pin. The UTC LR1812 is specially made for applications with low input voltage, low dropout voltage, and low output voltage which is almost the same as the input voltage. Typical applications include motherboards, notebooks, set top boxes, network cards and peripheral cards. FEATURES * V IN as Low as 1.4V and V PP Voltage 5V * V D I OUT =2A, =1.2V * Internal Over Current and Over Temperature Protection * With Enable Pin * Output Voltage: ±2% * 1.V, 1.2V, 1.5V, 1.8V and 2.5V Output Voltage Adjustable Externally Using Resistors * When Disable Pull Low Resistance ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package Packing LR1812XL-xx-S8-R LR1812xG-xx-S8-R SOP-8 Tape Reel LR1812XL-xx-SH2-R LR1812xG-xx-SH2-R HSOP-8 Tape Reel 1 of 8 Copyright 217 Unisonic Technologies Co., Ltd
2 LR1812 MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING SOP-8 HSOP-8 1: 1.V 12:1.2V 15:1.5V 18:1.8V 25:2.5V PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION 1 POK This pin will Indicate high under this situation: V O reaches 92% of its rating voltage. Open-drain output. 2 V EN The enable control Input pin. As while as this pin s voltage falls below.4v,the LR1812 will stop working. When there s nothing connected with this pin, for active High version, the device will be enabled, for active Low version,the device will be shutdowned 3 V IN The pin of input voltage. Placing large capacitance closely to this pin is necessary. There should be connected a 1µF ceramic capacitor. 4 V PP This pin is for input voltage to control circuit. 5 NC Connected nothing. 6 The voltage output pin. 7 ADJ When this pin connected to the ground, will be set by the internal feedback resistors. Otherwise, if using external feedback resistors to decide the, =.8(R1+R2)/R2 Volts. 8 GND Ground. UNISONIC TECHNOLOGIES CO., LTD 2 of 8
3 LR1812 BLOCK DIAGRAM Enable Threshold Level High: Enable Threshold Level Low: UNISONIC TECHNOLOGIES CO., LTD 3 of 8
4 LR1812 ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Input Voltage V PP, V IN 7 V Power Dissipation P D Internally limited Junction Temperature T J 15 C Ambient Operation Temperature T OPR -4~ +85 C Storage Temperature T STG -65~ +15 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. RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL RATINGS UNIT V IN Voltage V IN 1.4 ~5.5 V V PP Voltage V PP 4.5~5.5 V Ambient Operation Temperature T OPR -4 C T OPR +85 C C THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient SOP-8 15 C/W θ JA HSOP C/W Junction to Case SOP-8 2 C/W θ JC HSOP-8 14 C/W ELECTRICAL CHARACTERISTICS V PP =5V, V IN =3.3V, V EN =V PP, I OUT =1mA, C IN =1µF, C OUT =1µF, T A =T J =25 C, unless otherwise specified. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT V IN Input Voltage Range V IN V Quiescent Current (Ground Current) I Q =2.5V 1 2 ma V PP V PP Voltage Range V PP V V PP Current I PPH =2.5V.23.5 ma I PPL V EN =V 36 6 μa Output Voltage (Internal Fixed Voltage) V IN = +.5V, =2.5V V Line Regulation VOUT VIN VOUT V IN =( +.5V) ~ 5V.2 1 % Load Regulation 1mA I OUT 2A.2 1 % Dropout Voltage V D I OUT =2A 3 42 mv Short Circuit Current 1.4 A Pull Low Resistance V EN =V 9 Ω ADJ Reference Voltage V REF V ADJ = V Adjust Pin Current I ADJ 2 1 na Adjust Pin Threshold V V EN V EN Pin Voltage High V H(EN) 1.6 V V EN Pin Voltage Low V L(EN).4 V V EN Pin Bias Current I BIAS(EN) V EN =V 12 4 μa POK Power OK Voltage V THPOK 92 % Hysteresis V HYPOK 7 % OVER TEMPERATURE PROTECTION Over Temperature T OT 15 C Over Temperature Hysteresis T OTHY 3 C Note: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. UNISONIC TECHNOLOGIES CO., LTD 4 of 8
5 LR1812 TYPICAL APPLICATION CIRCUIT.8(R1+ R2) R2 UNISONIC TECHNOLOGIES CO., LTD 5 of 8
6 LR1812 TYPICAL CHARACTERISTICS (V CC = 3.3V, T A =25 C, unless otherwise specified.) 1 Quiescent Current vs. Input Voltage 1 Quiescent Current vs. Temperature.9.9 Quiescent Current, IQ (ma) Quiescent Current, IQ (ma) Temperature ( C) IPPH Current, IIPPH (ma) IPPH Current vs. Input Voltage IPPH Current, IIPPH (ma) IPPH Current vs. Temperature Temperature ( C) 4 IPPL Current vs. Input Voltage 4 IPPL Current vs. Temperature IPPL Current, IIPPL (µa) IPPL Current, IIPPL (µa) Temperature ( C) UNISONIC TECHNOLOGIES CO., LTD 6 of 8
7 LR1812 TYPICAL CHARACTERISTICS(Cont.) 2.55 Output Voltage vs. Input Voltage.812 Reference Voltage vs. Input Voltage Output Voltage, VO (V) I O =A 2.45 Reference Voltage, VREF (V) Max. Power Dissipation vs. PCB Top Copper Area 3.5 Max. Power Dissipation vs.t AMB (still air) Max. Dissipation Power, PD (W) Max. Dissipation Power, PD (W) A=1. in 2 A=1.5 in 2 A=5. in 2 A=4.5 in 2 A=2. in2 A=4. in 2 A=3.5 in 2 A=2.5 in 2 A=3. in 2 A=.5 in PCB Top Copper Area (in 2 ) T AMB ( C) Stop Load Transient Stop Short Circuit Current I OUT V IN =3.3V, =2.5V,I OUT = to 2A UNISONIC TECHNOLOGIES CO., LTD 7 of 8
8 LR1812 TYPICAL CHARACTERISTICS(Cont.) Stop V IN Start up Waveform Tek Stop V PP Start up Waveform V IN V PP V IN V PP V EN Start up Waveform Tek Stop V EN V PP V IN 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. UNISONIC TECHNOLOGIES CO., LTD 8 of 8
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UNISONIC TECHNOLOGIES CO., LTD 2.4A, 800V N-CHANNEL POWER MOSFET DESCRIPTION The UTC 2N80 is an N-channel mode power MOSFET using UTC s advanced technology to provide costumers planar stripe and DMOS technology.
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UNISONIC TECHNOLOGIES CO., LTD UTT30P04 Preliminary Power MOSFET -21A, -40V P-CHANNEL POWER MOSFET DESCRIPTION The UTC UTT30P04 is a P-channel power MOSFET providing customers with fast switching, ruggedized
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U74CBT3257 4-BIT 1-OF-2 FET MULTIPLEXER/ DEMULTIPLEXER UNISONIC TECHNOLOGIES CO., LTD CMOS IC DESCRIPTION The U74CBT3257 is a 4-bit 1-of-2 high-speed TTL-compatible FET multiplexer/demultiplexer. The low
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UNISONIC TECHNOLOGIES CO., LTD 7.4A, 600V N-CHANNEL POWER MOSFET DESCRIPTION The UTC 7N60 is a high voltage power MOSFET and is designed to have better characteristics, such as fast switching time, low
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UNISONIC TECHNOLOGIES CO., LTD UT50N03 50A, 30V N-CHANNEL POWER MOSFET FEATURES * R DS(ON) < 14 mω @ V GS = 10 V, I D = 30 A * Low capacitance * Optimized gate charge * Fast switching capability * Avalanche
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UNISONIC TECHNOLOGIES CO., LTD U74HCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS DIP-20 DESCRIPTION The U74HCT245 is designed for the asynchronous communication between data buses. While the direction-control(dir)
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UNISONIC TECHNOLOGIES CO., LTD 5A, 500V N-CHANNEL POWER MOSFET DESCRIPTION The UTC 5N50 is an N-channel power MOSFET adopting UTC s advanced technology to provide customers with DMOS, planar stripe technology.
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UNISONIC TECHNOLOGIES CO., LTD UTT80P06 Preliminary Power MOSFET -80A, -60V P-CHANNEL POWER MOSFET DESCRIPTION The UTC UTT80P06 is a P-channel power MOSFET using UTC s advanced technology to provide the
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UNISONIC TECHNOLOGIES CO., LTD 50A, 40V N-CHANNEL POWER MOSFET DESCRIPTION The UTC is a N-channel enhancement MOSFET using UTC s advanced technology to provide the customers with perfect R DS(ON) and high
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UNISONIC TECHNOLOGIES CO., LTD ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE DESCRIPTION The UTC LS1240A is monolithic integrated circuits and designed to be as a telephone ringer. It can drive a piezo-ceramic
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UNISONIC TECHNOLOGIES CO., LTD 10A, 650V N-CHANNEL POWER MOSFET DESCRIPTION The UTC 10N65 is a high voltage and high current power MOSFET, designed to have better characteristics, such as fast switching
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UNISONIC TECHNOLOGIES CO., LTD 6A, 6V N-CHANNEL POWER MOSFET DESCRIPTION The UTC 6N6 is N-channel enhancement mode power field effect transistors with stable off-state characteristics, fast switching speed,
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UNISONIC TECHNOLOGIES CO., LTD 20A, 150V N-CHANNEL POWER MOSFET DESCRIPTION The UTC 20N15V is a N-Channel POWER MOSFET, it uses UTC s advanced technology to provide customers with high switching speed
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UNISONIC TECHNOLOGIES CO., LTD DUAL OPERATIONAL AMPLIFIER DESCRIPTION The UTC LM358 consists of two independent high gain, internally frequency compensated operational amplifier. It can be operated from
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UNISONIC TECHNOLOGIES CO., LTD HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS DESCRIPTION The UTC UC3844/3845 are high performance fixed frequency current mode controllers that specifically designed for
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UNISONIC TECHNOLOGIES CO., LTD QS8M11 Preliminary Power MOSFET DUAL ENHANCEMENT MODE (N-CHANNEL/P-CHANNEL) DESCRIPTION The UTC QS8M11 uses UTC s advanced technology to provide the customers with low voltage
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UNISONIC TECHNOLOGIES CO., LTD ULN2003R Preliminary LINEAR INTEGRATED CIRCUIT HIGH VOLTAGE HIGH CURRENT DARLINGTON TRANSISTOR ARRAY DESCRIPTION The UTC ULN2003R is high-voltage, high-current darlington
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UNISONIC TECHNOLOGIES CO., LTD LOW POWER DUAL J-FET OPERATIONAL AMPLIFIER DESCRIPTION The UTC TL062 is a high speed J-FET input dual operational amplifier. It incorporates well matched, high voltage J-FET
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UNISONIC TECHNOLOGIES CO., LTD 60 Amps, 60 Volts N-CHANNEL POWER MOSFET DESCRIPTION The UTC 60N06 is n-channel enhancement mode power field effect transistors with stable off-state characteristics, fast
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UNISONIC TECHNOLOGIES CO., LTD 6A, 600V N-CHANNEL POWER MOSFET DESCRIPTION TO-220 TO-220F The UTC 6N60-P is a high voltage power MOSFET and is designed to have better characteristics, such as fast switching
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UNISONIC TECHNOLOGIES CO., LTD UC3842B/3843B HIGH PERFORMANCE CURRENT MODE CONTROLLERS DESCRIPTION The UTC UC3842B/3843B are specifically designed for off-line and dc-to-dc converter applications offering
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UNISONIC TECHNOLOGIES CO., LTD 2 CHANNEL LOW-DROPOUT VOLTAGE REGULATOR FEATURES *Dual output: 5.0V/1A, 3.3V/1A. *Output voltage precision of ±2%. *Output consists of PNP power transistor with low-dropout
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UNISONIC TECHNOLOGIES CO., LTD 1A, HIGHEFFICIENCY 1.5MHz/1MHz SYNCHRONOUS STEPDOWN CONVERTER DESCRIPTION The UTC UD05103 is a highfrequency, synchronous, rectified, stepdown, switchmode converter with
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