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| UNISONIC TECHNOLOGIES CO., LTD L11810 Preliminary CMOS IC 1A CMOS LOW DROPOUT VOLTAGE DESCRIPTION As UTC LDO, the features of the UTC L11810 include low quiescent current and very low dropout voltage. In order to prevent from the bad operating conditions, there are internal thermal shutdown and current fold-back. For stably operation, the UTC L11810 should be connected to an output capacitance of 2.2F or larger. The UTC L11810 is ideal for battery applications, such as portable electronics, wireless devices, cordless phones, PC peripherals and battery powered widgets. 1 FEATURES * Extra low dropout voltage * Output current: 1A (guaranteed) * Output voltage accuracy: 1.5% * Quiescent current: 30A * Internal Over-Temperature shutdown * With Current limiting * Internal short circuit current fold-back * Pre-set output voltages in factory * Very low temperature coefficient * Halogen Free SOT-223 ORDERING INFORMATION Ordering Number Package L11810G-xx-AA3-A-R SOT-223 L11810G-xx-AA3-D-R SOT-223 Note: Pin Assignment: G:GND O:VOUT I:VIN xx: Output Voltage, refer to Marking Information. G I Pin Assignment O I G O Packing Tape Reel Tape Reel www..com www.unisonic.com.tw Copyright (c) 2010 Unisonic Technologies Co., Ltd 1 of 6 QW-R502-329.c L11810 MARKING INFORMATION PACKAGE VOLTAGE CODE Preliminary CMOS IC MARKING SOT-223 28 :2.8V 33 :3.3V PIN CONFIGURATION PIN DESCRIPTION PIN NO 1 2 3 PIN NAME VIN GND VOUT DESCRIPTION Input voltage pin which should be decoupled with 1F or greater capacitor. Ground. Output voltage pin which should be decoupled with a ceramic capacitor (value: 2.2F or larger and low ESR). www..com UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R502-329.c L11810 BLOCK DIAGRAM VIN Preliminary CMOS IC Overcurrrent Shutdown Thermal Shutdown VREF=1.215V AMP VOUT R1 R2 GND www..com UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R502-329.c L11810 ABSOLUTE MAXIMUM RATING Preliminary CMOS IC PARAMETER SYMBOL RATINGS UNIT Input Voltage VIN 8 V Input ,Output Voltage GND - 0.3 ~ VIN + 0.3 V Output Current IOUT 1.2 A Power Dissipation PD 900 mW Junction Temperature TJ 125 C Operating 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. THERMAL DATA PARAMETER Junction to Ambient Junction to Case (Note) Note: Measure JC on backside center of tab SYMBOL JA JC RATINGS 120 25 UNIT C/W C/W ELECTRICAL CHARACTERISTICS (Ta = 25C, unless otherwise specified.) PARAMETER Input Voltage Output Voltage Accuracy Line Regulation Load Regulation Output Current Current Limit Short Circuit Current Quiescent Current Ground Pin Current Dropout Voltage Over Temperature Shutdown Over Temperature Hysteresis Temperature Coefficient of Output Voltage Power Supply Ripple Rejection SYMBOL TEST CONDITIONS VIN VOUT IOUT =1mA 1.8VVOUT2.0V VOUT IOUT =1mA, 2.0V www..com UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R502-329.c L11810 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT APPLICATION INFORMATION 1. Detailed Description Internal circuits include: a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. The data through the error amplifier, over-current shutdown, and thermal protection circuits, then to the P-channel pass transistor. As soon as the junction temperature exceeds 150C or the current exceeds 1100mA, over-current and thermal shutdown circuits start working. When the junction temperature drops below 120C, normal operation is restored. When the load exceeds the rated output current, for preventing the over stress, the chip switches from voltage mode to current mode. 2. External Information When considering the external capacitors, the L11810 is stable with an output capacitor to ground of 2.2F or greater. As we know, the ceramic capacitors have the lowest ESR but can offer the best AC performance; the aluminum electrolytic capacitors exhibit the highest ESR but offer the poorest AC response. And also large value ceramic capacitors are expensive. Consider all the situation, the best way is to parallel a 0.1F ceramic capacitor with a 10F Aluminum Electrolytic (low ESR, high capacitance, and low overall cost). For better beneficial effecting, the input capacitor should be at least 0.1F. www..com UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R502-329.c L11810 Preliminary CMOS IC UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even www..com 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-R502-329.c |
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