UNISONIC TECHNOLOGIES CO., LTD LR2125 LINEAR INTEGRATED CIRCUIT 300mA SELECTABLE FIXED/ADJUSTABLE LOW DROPOUT LINEAR REGULATOR DESCRIPTION As a low dropout linear regulator, the UTC LR2125 only needs low input voltage (2.8~6V) and can deliver current to 300mA for setting the output voltage. The UTC LR2125 is an ideal for being used in such battery-powered equipments notebook, personal computer and cellular phone. Its typical dropout voltage is 230mV at loading current 300mA. For setting the output voltage, the UTC LR2125 has two output voltage operation modes: fixed mode senses the output voltage on VOUT, ADJ mode needs two resistors as a voltage divider. To protect itself against current over-loads and over temperature, the LR2125 has current limit and thermal shutdown functions. FEATURES * Operating Voltage: 2.8~6V * Low Voltage Dropout * Output Current Guaranteed 300mA * For Setting Output Voltage Two Modes – Fixed mode :Fixed Output Voltage 1~5V – ADJ mode: Adjustable Output Voltage 0.8~5.5V * Internal Current Limit Protection * With Soft-Start * Internal thermal Protection * Work stably with Low ESR Ceramics Capacitor ORDERING INFORMATION Ordering Number Lead Free Halogen Free LR2125L-xx-AF5-R LR2125G-xx-AF5-R www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd Package Packing SOT-25 Tape Reel 1 of 8 QW-R102-038.F LR2125 LINEAR INTEGRATED CIRCUIT MARKING INFORMATION PACKAGE VOLTAGE CODE 18 :1.8V SEXX□ 25 :2.5V AD :ADJ 1 PIN CONFIGURATION PIN DESCRIPTION PIN NO PIN NAME 1 SHDN 2 3 4 GND VIN VOUT 5 SET 4 5 12 :1.2V SOT-25 MARKING 2 3 G: Halogen Free L: Lead Free Voltage Code DESCRIPTION Control pin for shutdown Logic High: enable Logic Low: shutdown Ground Voltage supply Output pin When this pin is connected to ground, turns to fixed output voltage operation. When this pin is connected to an external resistor divider, turns to adjustable output voltage mode operation. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R102-038.F LR2125 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R102-038.F LR2125 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA = 25°С, Unless otherwise specified) PARAMETER VIN Supply Voltage (VIN to GND) SHDN Input Voltage ( SHDN to GND) SYMBOL VIN VSHDN RATINGS -0.3 ~ +6.5 UNIT V -0.3 ~ +6.5 V Power Dissipation PD 380 mW Junction Temperature TJ -40~ +125 °С Storage Temperature TSTG -65 ~ +150 °С 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 VIN VOUT IOUT CIN COUT TOPR VIN Supply Voltage Output Voltage VOUT Output Current Input Capacitor Output Capacitor Junction Temperature RATINGS 2.8 ~ 6 0.8 ~ 5.5 0 ~ 300 0.22 ~ 100 1.5 ~ 33 -40 ~ +85 UNIT V V mA μF μF °С ELECTRICAL CHARACTERISTICS (VIN = VOUT+1V (min VIN=2.8V), IOUT=0~300mA, CIN = 1μF, COUT = 2.2μF, TA = 25°С, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Output Voltage VOUT 0.8 5.5 V Input Voltage VIN 2.8 6 V Line Regulation ΔVOUT ΔVIN × VOUT △VOUT%/△VIN, IOUT=10mA -0.06 +0.06 %/V Load Regulation ΔVOUT ΔIOUT × VOUT △VOUT%/△IOUT -0.2 +0.2 %/A +2 % 0.8 0.816 V 135 230 170 45 160 500 160 360 300 0.4 μA mV mV dB μVRMS mA V V 1 μA Output Voltage Accuracy Reference Voltage VREF Quiescent Current IQ Dropout Voltage VD Power Supply Ripple Rejection Ratio Output Voltage Noise Current Limit Shutdown Threshold Shutdown Supply Current PSRR eN ILIMIT VIH VIL IOFF VOUT Discharge MOSFET RDS(ON) Thermal Shutdown Temperature Thermal Shutdown Hysteresis SET Input Threshold for Fixed/Adjustable Output Voltage Mode SET Input Bias Current Soft-Start Interval Fixed output voltage, IOUT=10mA -2 Measured on SET, VIN=2.8V, 0.784 IOUT=10mA IOUT =10mA ~300mA VOUT = 2.5V, IOUT = 300mA VOUT = 3.3V, IOUT = 300mA f = 10kHz, IOUT = 300mA f = 80Hz ~ 100KHz, IOUT = 300mA 400 1.6 SHDN = Low TSHDN DTSHDN 60 Ω 160 40 °С °С 100 mV -100 TSS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 0.1 SHDN = Low, VIN = 6V 650 100 60 nA μs 4 of 8 QW-R102-038.F LR2125 LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION Input Capacitor Value： Larger than 1µF, at least a 1µF ceramic capacitor Place： Be placed near the VIN very closely Purpose and Advantage Description： To prevent the input rail from dropping, this capacitor can provide surge current as while as the circuit’s stepping load transients. Output Capacitor Value： Larger than 2.2µF Place： Be placed at the load and near the GND pin very closely. Purpose and Advantage Description： Mainly make sure the circuit’s operating stability. And the large value capacitor also can reduce noise and improve transient response. Additionally, it can affect power on issue. COUT(max) = 87 × (0.55 - 0.1155 ) VOUT Output Capacitor,COUT(µF) Maximum Output Capacitor’s Value (µF) and the Output Voltage (V)’s Value’s Relationship Maximum Output Capacitor’s Changing Over VOUT. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 8 QW-R102-038.F LR2125 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUITS For Fixed Output Voltage Mode For Adjustable Output Voltage Mode VOUT = 0.8 × (1+ UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw R1 ) R2 6 of 8 QW-R102-038.F LR2125 TYPICAL CHARACTERISTICS Quiescent Current vs. Output Current Output Voltage vs. Input Voltage 3.0 180 IOUT=0mA Quiescent Current, IQ(µA) Output Voltage,VOUT (V) 2.5 2.0 IOUT=300mA 1.5 1.0 0.5 0 0 1 2 3 4 5 160 140 VIN=4.5V 100 80 60 6 VIN=5.5V 120 0 Input Voltage,VIN (V) Dropout Voltage,VDROP(mV) 150 100 IOUT=0mA 1 2 3 4 150 200 250 300 Dropout Voltage vs. Output Current IOUT=300mA 0 100 300 200 50 50 Output Current, IOUT(mA) Quiescent Current vs. Input Voltage 250 Quiescent Current,IQ(µA) LINEAR INTEGRATED CIRCUIT 5 6 250 200 150 100 50 0 0 50 100 150 200 250 Input Voltage,VIN(V) Output Current,IOUT(mA) Line Transient Load Transient CIN=1µF,COUT=2.2µF, 300 VIN=3.0V,CIN=1µF,COUT=2.2µF VOUT VIN VOUT CH1:VIN,1V/div,DC CH2:VOUT,20mV/div,AC Time:100µs/div UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw IOUT CH2:VOUT,50mV/div,AC CH3:IOUT,200mA/div,DC Time:100µs/div 7 of 8 QW-R102-038.F LR2125 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS(Cont.) 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 www.unisonic.com.tw 8 of 8 QW-R102-038.F