UNISONIC TECHNOLOGIES CO., LTD LD3870 Preliminary LINEAR INTEGRATED CIRCUIT LOW DROPOUT VOLTAGE REGULATOR DESCRIPTION The UTC LD3870 is low dropout voltage regulator designed for cellular phone application. FEATURES * High Ripple Rejection: 56dB≤RR(DC<f<60kHz) 66dB typ. (f=100Hz) 60dB typ. (f=1kHz) * Output Noise Voltage: eN=30ΜV , Cp=0.01μF * Output Current: IO(MAX)=150mA * High Precision Output: VO±2% * Low Dropout Voltage: VD=0.12V typ. (IO=60mA,Vo≥1.8V) * Input Voltage range: +2~+14V(VO =1.5V Version) * ON/OFF Control: Active High * Output capacitor with 4.7uF ceramic capacitor * Internal Short Circuit Current Limit * Internal Thermal Overload Protection ORDERING INFORMATION Ordering Number Lead Free Halogen Free LD3870L-AF5-R LD3870G-AF5-R Note: xx: Output Voltage, refer to Marking Information. www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., LTD Package Packing SOT-25 Tape Reel 1 of 5 QW-R105-028,Da LD3870 Preliminary LINEAR INTEGRATED CIRCUIT MARKING INFORMATION PACKAGE VOLTAGE CODE SOT-25 15:1.5V 18:1.8V 25:2.5V 27:2.7V 30:3.0V 33:3.3V 50:5.0V MARKING 4 5 MXX□ G: Halogen Free L: Lead Free Voltage Code 1 2 3 PIN CONFIGURATION VIN 5 VOUT 4 3 1 2 CONT GND NOISE BYPASS BLOCK DAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R105-028,Da LD3870 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (TA=25℃, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Input Voltage VIN +14 V Control Voltage VCONT +14(Note 2) V Power Dissipation PD 200 mW Operating Temperature TOPR -40 ~ +85 ℃ Storage Temperature TSTG -40 ~ +125 ℃ Note 1: 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. 2. When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage. ELECTRICAL CHARACTERISTICS (VIN=VOUT+1V, CIN=0.1μF, COUT=4.7μF, Cp=0.01μF, TA=25℃) PARAMETER SYMBOL TEST CONDITONS MIN TYP MAX UNIT Output Voltage VOUT IOUT=30mA -2% +2% V Quiescent Current IQ IOUT=0mA, expect lCONT 200 300 μA Quiescent Current IQ(OFF) VCONT=0V 100 nA At Control OFF Output Current IOUT VOUT-0.3V 150 200 mA Line Regulation △VOUT/△VIN VIN=VOUT+1V ~ VOUT+6V, IOUT=30mA 0.10 %/V Load Regulation △VOUT/△IOUT IOUT=0 ~ 100mA 0.03 %/mA Dropout Voltage VD IOUT=60mA 0.12 0.2 V eIN=200mVrms, f=1kHz, IOUT=10mA, 60 dB Ripple Rejection RR VIN=VOUT+2V, VOUT=3V Version TA=0~85℃, IOUT=10mA, Average Temperature △VOUT/△TA 0.2 mV/℃ Coefficient of Output Voltage VOUT=3V Version f=10Hz ~ 80kHz, IOUT=10mA, 30 μVrms Output Noise Voltage eN VOUT=3V Version ON VCONT(ON) 1.6 V Control Voltage OFF VCONT(OFF) 0.6 V Note: The above specification is a common specification for all output voltages. Therefore, it may be different from the individual specification for a specific output voltage. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R105-028,Da LD3870 Preliminary LINEAR INTEGRATED CIRCUIT TEST CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R105-028,Da LD3870 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATON For ON/OFF Control is not required: VIN 4.7 μF (ceramic or tantalum) 0.1 μF UTC LD3870 R (0~300kΩ) VOUT VOUT NOISE BYPASS GND CONTROL Cp=0.01 μF Connect control terminal to VIN terminal The quiescent current can be reduced by using a resistance “R”. Instead, it increases the minimum operating voltage. For further information, please refer to Figure ”Output Voltage vs. Control Voltage”. For In use of ON/OFF CONTROL: VIN VIN VOUT 0.1 μF UTC LD3870 VOUT 4.7 μF (ceramic or tantalum) R NOISE BYPASS GND CONTROL Cp=0.01 μF State of control terminal: * ”H” Æ Output is enables. * ”L”or “open” Æ Output is disabled. * Noise bypass Capacitance Cp - Noise bypass capacitance Cp reduces noise generated by hand-gap reference circuit. - Noise level and ripple rejection will be improved when larger Cp is used. - Use of smaller Cp value may cause oscillation. - Use the Cp value of 0.01uF greater to avoid the problem. 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 5 of 5 QW-R105-028,Da