UNISONIC TECHNOLOGIES CO., LTD LR1125 CMOS IC 500mA, LOW-VOLTAGE LINEAR REGULATOR DESCRIPTION The UTC LR1125 is a positive LDO (voltage linear regulator) operates from a 2.25V ~ 5.5V supply and delivers a guaranteed 500mA load current with low 175mV dropout. Low dropout voltage and large output current can be provided by built-in low on-resistance transistor. Because an internal PMOS pass transistor allows low 210µA supply current, the LR1125 can be ideal for portable equipment such as PDAs, cellular phones, cordless phones, and other equipments including base stations and docking stations. It also includes an active-low, power-OK output that mean a 0.02µA shutdown mode, short-circuit protection and thermal-shutdown protection when the output is out of regulation. FEATURES * Low Dropout : 175mV Dropout at 500mA * High accuracy output voltage: +/- 1.5% * Guaranteed Output:500mA * Thermal-Overload Protection * Internal Current Limiting * Low 210µA Ground Current * 0.02µA Shutdown Current * VOUT Can Be Adjusted From 0.8V ~ 4.5V ORDERING INFORMATION Ordering Number LR1125G-S08-R LR1125G-SM1-R Package SOP-8 MSOP-8 www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd Packing Tape Reel Tape Reel 1 of 7 QW-R502-416.A LR1125 CMOS IC PIN CONFIGURATION PIN DESCRIPTION PIN NO PIN NAME 1, 2 IN 3 POK 4 SHDN 5 GND 6 SET 7, 8 OUT DESCRIPTION Input. Supply voltage: 2.25V ~ 5.5V. Bypass with a 1µF capacitor to GND. Connect both input pins together. Open-Drain, Active-Low Power-OK Output. While the output voltage (VOUT) is below the POK threshold, this pin remains low. Connect a 100kΩpullup resistor to OUT. Active-Low Shutdown Input. At this pin, a logic low reduces supply current to 0.02µA. In shutdown, the POK output is low. For normal operation Connect SHDN to IN. Ground. Voltage-Setting Input. For preset output, connect this pin to GND. Connect an external resistive voltage-divider from OUT to this pin to set the output voltage from 0.8V to 4.5V. This pin regulation voltage is 800mV. Regulator Output (up to 500mA). This pin should be bypassed with a 10µF low-ESR capacitor to GND. Connect both OUT pins together. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 7 QW-R502-416.A LR1125 CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT IN, SHDN, POK, SET to GND -0.3~+6 V OUT to GND -0.3~(VIN+0.3) V Output Short-Circuit Duration ID continuous Power Dissipation (Ta=70°C) PD 1.95 W Junction Temperature TJ +150 °C Operating Temperature TOPR -40~+85 °C Storage Temperature Range TSTG -65~+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. ELECTRICAL CHARACTERISTICS (VIN=VOUT(SETPOINT)+500mV or VIN=2.25V which is greater, SET=GND, SHDN=IN, unless otherwise specified. Typical values are at Ta=25°C) Ta=0°C~85°C PARAMETER Input Voltage Input Undervoltage Lockout Output Voltage Accuracy (Preset Mode) SYMBOL TEST CONDITIONS VIN VUVLO Rising, 40mV hysteresis IOUT=100mA IOUT=1mA ~ 500mA VOUT Ta=0°C ~85°C, IOUT=1mA~500mA, VIN>VOUT+0.5V Adjustable Output Voltage SET Voltage Threshold (Adjustable Mode) Maximum Output Current Short-Circuit Current Limit SET Dual Mode Threshold SET Input Bias Current VSET IOUT ILIMIT ISET Ground-Pin Current IQ Dropout Voltage (Note 1) VD Line Regulation ∆VLNR Load Regulation Output Voltage Noise SHUTDOWN Shutdown Supply Current ∆VLDR SHDN Input Threshold SHDN Input Bias Current Startup Time IOFF VIH VIL I SHDN tSTART IOUT=100mA IOUT=1mA ~ 500mA Ta=0°C ~85°C, IOUT=1mA~500mA, VIN>VOUT+ 0.5V VOUT=0V VSET=0.8V IOUT=1mA IOUT=500mA IOUT= 500mA, VOUT=2.25V IOUT= 500mA, VOUT=2.8V IOUT= 500mA, VOUT=4V VIN from (VOUT+100mV)~5.5V, ILOAD=5mA IOUT=1mA ~500mA 10Hz~1MHz, CO=10µF(ESR<0.1Ω) TYP 2 MAX 5.50 2.15 +1.5 +2.5 -3 +3 0.8 788 780 4.5 812 820 774 800 500 600 1400 35 80 -100 210 575 259 201 147 UNIT V V % V mV 826 mA 2300 125 +100 600 mA mV nA µA 400 350 275 mV 0 0.125 %/V 15.5 300 35 ppm/mA 0.02 5 SHDN = GND or IN 10 0.6 100 CO=10µF,time from SHDN high to POK high 40 SHDN = GND, VIN= 5.5V µV RMS 1.6 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 2.25 1.85 -1.5 -2.5 µA V nA µs 3 of 7 QW-R502-416.A LR1125 CMOS IC ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER SYMBOL POK Output Low Voltage Operating Voltage Range for Valid POK Output VOL TEST CONDITIONS MIN TYP MAX UNIT 5 50 mV 5.5 V 100 nA 96 % POWER-OK Sinking 2mA Sinking 100µA Output High Leakage Current VPOK=5.5V Threshold THERMAL PROTECTION Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis Rising edge, referred to VOUT Ta=-40°C~85°C(Note 2) PARAMETER Input Voltage Input Under Voltage Lockout Output Voltage Accuracy (Preset Mode) Adjustable Output Voltage SET Voltage Threshold (Adjustable Mode) Maximum Output Current Short-Circuit Current Limit SET Dual Mode Threshold SET Input Bias Current Ground-Pin Current SHUTDOWN Shutdown Supply Current SHDN Input Threshold 1.0 90 TSHDN ∆TSHDN SYMBOL VIN VUVLO VOUT VOUT(ADJ) 93 170 20 TEST CONDITIONS Rising, 40mV hysteresis IOUT=1mA~500mA VSET IOUT ILIM IOUT=1mA~500mA VOUT=0V ISET IQ VSET=0.8V IOUT=1mA IOFF VIH VIL SHDN=GND, VIN=5.5V 2.5V < VIN < 5.5V 2.5V < VIN < 5.5V SHDN=GND or IN MIN 2.25 1.85 -4 TYP °C °C MAX 5.50 2.15 +4 UNIT V V % 0.8 4.5 V 766 500 600 35 -100 834 2500 125 +100 400 mV mA mA mV nA µA 5 µA 1.6 0.6 100 V I SHDN SHDN Input Bias Current 10 nA POWER-OK POK Output Low Voltage VOL Sinking 2mA 50 mV Operating Voltage Range for Valid Sinking 100µA 1.0 5.5 V POK Output Output High Leakage Current VPOK=5.5V 100 nA Threshold Rising edge, referred to VOUT 89 97 % Note 1. Dropout voltage is :VIN - VOUT. For 2.25V ≤ VOUT ≤ 4V, dropout voltage limits are linearly interpolated from the values listed. For VOUT < 4V, dropout voltage limit is equal to the value for VOUT = 4V. 2. Specifications to -40°C are guaranteed by design, not production tested. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 7 QW-R502-416.A LR1125 CMOS IC TYPICAL APPLICATION CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 7 QW-R502-416.A LR1125 CMOS IC TYPICAL CHARACTERISTICS (VOUT = 3.3V, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 10µF, TA = +25°C, unless otherwise noted.) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 7 QW-R502-416.A LR1125 CMOS IC 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 7 of 7 QW-R502-416.A