UNISONIC TECHNOLOGIES CO., LTD L1188 Preliminary CMOS IC 800mA CMOS LDO DESCRIPTION As UTC LDO, the features of the UTC L1188 include low quiescent current and very low dropout voltage. In order prevent form the bad operating conditions, there are internal thermal shutdown and current fold-back. For stably operation, the UTC L1188 should be connected to an output capacitance of 2.2μF or larger. The UTC L1188 can be an ideal for battery applications, such as portable electronics, wireless devices, cordless phones, PC peripherals and battery powered widgets. 1 SOT-223 FEATURES * Extra Low Dropout Voltage * Output Current: 800mA (Guaranteed) * Output Voltage Accuracy:±1.5% * Quiescent Current: 30μA * Internal Over-Temperature Shutdown * With Current limiting * Internal Short Circuit Current Fold-Back * Pre-set Output Voltages In Factory * Very Low Temperature Coefficient ORDERING INFORMATION Ordering Number Lead Free Halogen Free L1188L-xx-AA3-A-R L1188G-xx-AA3-A-R Note: Pin Assignment: G:GND O:VOUT I:VIN xx: Output Voltage, refer to Marking Information. www.unisonic.com.tw Copyright © 2012 Unisonic Technologies Co., Ltd Package SOT-223 Pin Assignment 1 2 3 G O I Packing Tape Reel 1 of 4 QW-R502-324.d L1188 Preliminary MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING 28 :2.8V SOT-223 33:3.3V PIN CONFIGURATION PIN DESCRIPTION CMOS IC PIN NO. 1 PIN NAME GND 2 VOUT 3 VIN DESCRIPTION Ground. Output voltage pin which should be decoupled with a ceramic capacitor (Value: 2.2µF or larger and low ESR). Input voltage pin which should be decoupled with 1µF or greater capacitor. BLOCK DIAGRAM VIN Overcurrrent Shutdown Thermal Shutdown VREF=1.215V AMP VOUT R1 R2 GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 4 QW-R502-324.d L1188 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Input, Output Voltage GND - 0.3 ~ VIN + 0.3 V Input Voltage VIN 8 V Output Current IOUT 1 A Power Dissipation PD 800 mW Junction Temperature TJ 125 °C Ambient Operating Temperature TOPR - 40 ~ +85 °C Storage Temperature TSTG - 65 ~ +150 °C Notes: 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 θJC on backside center of tab. SYMBOL θJA θJC RATINGS 135 31 UNIT °C/W °C/W ELECTRICAL CHARACTERISTICS (TA = 25°C, 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 MIN TYP VIN Note1 VOUT IOUT = 1mA -1.5 -0.15 1.8V≤VOUT≤2.0V ΔVOUT IOUT=1mA 2.0V<VOUT<4.0V -0.1 0.02 VOUT VIN=VOUT+1~VOUT+2 VOUT≥4.0V -0.4 0.2 ΔVOUT 0.2 IOUT =1mA~800mA VOUT IOUT VOUT≥1.8V 800 ILIMIT VOUT≥1.8V 900 ISC VOUT<0.8V 400 IQ IOUT=0mA 30 IGND IOUT=1mA ~ 800mA 35 1.8V≤VOUT(NOM)≤2.0V IOUT=800mA VD 2.0V<VOUT(NOM)≤2.8V VOUT=VOUT(NOM)-2.0% 2.8V<VOUT(NOM) OTS 150 OTH 30 TCVO PSRR f=100Hz f=1kHz f=10kHz IOUT=10mA, COUT=2.2μF, f=10Hz~100kHz IOUT=100mA CO=2.2μF MAX 7 1.5 0.15 0.1 0.4 UNIT V % % % % 1 % 800 50 1400 1000 800 mA mA mA μA μA mV mV mV °C °C 30 ppm/°C 60 50 20 30 dB dB dB μVRMS Output Voltage Noise eN Notes: 1. VIN(MIN)=VOUT+VD 2. To prevent the Short Circuit Current protection feature from being prematurely activated, the input voltage must be applied before a current source load is applied. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 4 QW-R502-324.d L1188 Preliminary TYPICAL APPLICATION CIRCUIT APPLICATION INFORMATION CMOS IC 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 150°C or the current exceeds 900mA, over-current and thermal shutdown circuits start working. When the junction temperature drops below 120°C, 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 L1188 is stable with an output capacitor to ground of 2.2μF 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 0.1μF ceramic capacitor with a 10μF Aluminum Electrolytic (low ESR, high capacitance, and low overall cost). For better beneficial effecting, the input capacitor should be at least 0.1μF. 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 4 of 4 QW-R502-324.d