UNISONIC TECHNOLOGIES CO., LTD L11831A/B Preliminary CMOS IC MAXIMUM 3A, ULTRA LOW DROPOUT REGULATOR WITH ENABLE DESCRIPTION The UTC L11831A/B 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 1V,1.05V, 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 L11831A/B can be low to 1.4V. There are two additional pin in the UTC L11831A/B. One is EN pin and the other is POK pin. The UTC L11831A/B 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 * VIN as low as 1.4V and VDD voltage 5V * Maximum 3A low-dropout voltage regulator * High accuracy output voltage ±1.5% * When disable VO pull low resistance * Internal over current and over temperature protection ORDERING INFORMATION Ordering Number Note: L11831AG-xx-SH2-R L11831BG-xx-SH2-R xx: Output Voltage, refer to Marking Information. www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd Package Packing HSOP-8 HSOP-8 Tape Reel Tape Reel 1 of 6 QW-R502-A88.b L11831A/B Preliminary MARKING INFORMATION PACKAGE VOLTAGE CODE HSOP-8 12: 1.2v 15 : 1.5V 18: 1.8V 25: 2.5V CMOS IC MARKING PIN CONFIGURATION POK 1 EN 2 8 GND 7 ADJ GND VIN 3 6 VOUT VDD 4 5 NC PIN DESCRIPTION PIN NO. PIN NAME 1 POK 2 3 4 5 6 EN VIN VDD NC VOUT 7 ADJ 8 GND DESCRIPTION This pin will indicate high under this situation: VO reaches 90% of its rating voltage. Open-drain output. Chip enable (active-high) / (active-low) The pin of input voltage. This pin is for input voltage to control circuit. No internal connection Output voltage When this pin connected to the ground, VOUT will be set by the internal feedback resistors. Otherwise, if using external feedback resistors to decide the VOUT, VOUT = 0.8(R1+R2)/R2 Volts. Ground. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R502-A88.b L11831A/B Preliminary CMOS IC BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R502-A88.b L11831A/B Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Input Voltage VDD, VIN 6 V Power Dissipation PD Internally limited Junction Temperature TJ 150 °C Operation Temperature TOPR -40~+85 °C Storage Temperature 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. RECOMMENDED OPERATING CONDITIONS (Note 1) PARAMETER Supply Voltage Control Voltage (VDD≥VOUT+1.5V) Junction Temperature Range Ambient Temperature Range SYMBOL VIN VDD TJ TA RATINGS 1.4~5.5 3~5.5 -40~125 -40~85 UNIT V V °C °C SYMBOL θJA θJC RATINGS 143 14 UNIT °C/W °C/W THERMAL DATA PARAMETER Junction to Ambient Junction to Case UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R502-A88.b L11831A/B Preliminary CMOS IC ELECTRICAL CHARACTERISTICS (VIN=VOUT+500mV, VEN=VDD=5V, CIN=COUT=10µF, TA=TJ=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT POR Threshold 2.4 2.7 3 V POR Hysteresis 0.2 V Adjustable Pin Threshold VTH_ADJ IOUT=1mA 0.2 0.4 V Reference Voltage (ADJ Pin Voltage) VADJ IOUT=1mA 0.788 0.8 0.812 V Fixed Output Voltage Range ∆VOUT -1.5 0 1.5 % Line Regulation (VIN) ∆VLINE_IN VIN=VOUT+0.5V to 5V, IOUT=1mA 0.2 0.6 % Load Regulation (Note 2) ∆VLOAD VIN=VOUT+1V, IOUT=1mA~3A 0.4 1 % IOUT=2A 200 250 mV Dropout Voltage (Note 3) VDROP IOUT=3A 300 350 mV Quiescent Current (Note 4) IQ VDD=5.5V 0.9 mA Current Limit ILIM 3.2 5.5 A Short Circuit Current VOUT<0.2V 0.5 1.8 A VOUT Pull Low Resistance VEN=0V 100 Ω Chip Enable EN Input Bias Current IEN VEN=0V 12 µA L11831A 10 20 µA VDD Shutdown Current ISHDN VEN=0V L11831B 1 µA Logic-High VENH VDD=5V 1.2 V EN Threshold Voltage Logic-Low VENL VDD=5V 0.7 V Power Good POK Rising Threshold 90 93 % POK Hysteresis 3 10 % POK Sink Capability IPOK=10mA 0.2 0.4 V POK Delay 0.5 1.5 5 ms Thermal Protection Thermal Shutdown Temperature TSD 160 °C Thermal Shutdown Hysteresis ∆TSD 30 °C Notes: 1. The device is not guaranteed to function outside its operating conditions. 2. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested for load regulation in the load range from 1mA to 3A. 3. The dropout voltage is defined as VIN-VOUT, which is measured when VOUT is VOUT(NORMAL)-100mV. 4. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ=IIN-IOUT under no load condition (IOUT=0mA). The total current drawn from the supply is the sum of the load current plus the ground pin current. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R502-A88.b L11831A/B Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT 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 6 of 6 QW-R502-A88.b