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| UNISONIC TECHNOLOGIES CO., LTD L11815B 1.5A CMOS LDO DESCRIPTION The UTC L11815B is a positive, linear regulator. One of its features is the very low quiescent current typically as low as 45A and the dropout voltage is extremely low. The internal circuit includes thermal shutdown and current fold-back mechanism to prevent device failure when the circuit is operated in the bad conditions. In application, the UTC L11815B needs a low noise and regulated supply. For stability, the output capacitance value should be 4.7F or more. The UTC L11815B is an ideal for battery applications, such as instrumentations, portable electronics, wireless devices, cordless phones, PC peripherals, and battery powered widgets. The output voltage values are set during manufacturing and their accuracy is trimmed to within 1.5%. Preliminary CMOS IC FEATURES * Quiescent current (45A typ.) * Accurate :1.5% * Very low dropout voltage * Guaranteed 1.5A output * Over-temperature shutdown * With current limiting * Short circuit current fold-back * Power-saving shutdown mode * Low temperature coefficient * Halogen Free ORDERING INFORMATION Ordering Number Package L11815BG-xx-S08-R SOP-8 Note: xx: Output Voltage, refer to Marking Information. Packing Tape Reel www.unisonic.com.tw Copyright (c) 2009 Unisonic Technologies Co., Ltd 1 of 6 QW-R502-352.a L11815B MARKING INFORMATION PACKAGE VOLTAGE CODE Preliminary CMOS IC MARKING SOP-8 AD: ADJ Voltage Code UTC L11815BG XX Date Code Lot Code PIN CONFIGURATION PIN DESCRIPTION PIN NO 1 2 3 4 5~8 PIN NAME EN VIN VOUT ADJ GND DESCRIPTION Enable pin. When pulled low, the PMOS pass transistor turns off, current consuming less than 1A. Input voltage pin. It should be decoupled with 1F or greater capacitor. LDO voltage regulator output pin. It should be decoupled with a 4.7F or greater value low ESR ceramic capacitor. Feedback output voltage for adjustable device. Ground connection pin. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R502-352.a L11815B BLOCK DIAGRAM VIN Preliminary CMOS IC OCP VOUT OTP EN EA ADJ VREF=1.242V GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R502-352.a L11815B ABSOLUTE MAXIMUM RATING PARAMETER Input Voltage Input Voltage (EN) Output Voltage Preliminary CMOS IC RATINGS UNIT -0.3 ~ +8 V -0.3 ~ +8 V -0.3 ~ VIN + 0.3 V PD Output Current IOUT mA VIN - VOUT Power Dissipation PD 810 mW Junction Temperature TJ 150 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. SYMBOL VIN VEN VOUT THERMAL DATA PARAMETER SYMBOL Junction to Ambient JA Junction to Case (Note) JC Note: JC on center of molding compound if IC has on tab MIN TYP MAX 150 60 UNIT C/W C/W ELECTRICAL CHARACTERISTICS (VIN =VOUT+2V, VEN =VIN , Ta =25C, unless otherwise specified) PARAMETER Input Voltage Output Voltage Accuracy ADJ Reference Voltage Line Regulation Load Regulation Output Current Current Limit Short Circuit Current Minimum Load Current Ground Pin Current ADJ Input Bias Current Dropout Voltage Over Temperature Shutdown Over Temperature Hysteresis Temperature Coefficient of Output Voltage Power Supply Rejection Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current Note: VIN(MIN)=VOUT+VDROPOUT SYMBOL VIN VOUT VREF VOUT VOUT VOUT VOUT TEST CONDITIONS VEN = VEH(MIN), IOUT=1mA VOUT<2.0V IOUT=1mA 4.0 >VOUT2.0V VIN=VOUT+1~VOUT+2 4.0VVOUT IOUT=1mA ~ 1.5A VOUT>1.2V VOUT>1.2V VOUT<0.4V IOUT=1mA ~ 1.5A VIN = 5V , VADJ = 1.242V 1.5V UNIT V % V % % % % mA mA mA mA A A mV mV mV C C ppm/C dB dB Vrms V V A A A IOUT ILIM ISC IMIN IGND IADJ VD OTS OTH TCVO PSRR eN VEH VEL IEH IEL ISD IO=100mA, f=1kHz CO=4.7F ceramic f=10kHz f=10Hz~100kHz, IOUT=10mA, CO=4.7F 2.0 0 VIN= 7V VEN=0V, VIN= 7V VIN = 5V , VO=0V, VEN=0V 50 20 30 VIN 0.4 0.1 0.5 2 0.5 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R502-352.a L11815B DETAILED DESCRIPTION Preliminary CMOS IC The UTC L11815B of CMOS regulators insist of a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. The error amplifier, over-current shutdown, and thermal protection circuits provides data for P-channel pass transistor. The error amplifier takes output voltage for a precision reference in the normal operation and the normal operation is restored when the junction temperature drops below 120C. Over-current and Thermal shutdown circuits start to work when the junction temperature is higher than 140C, or the current is higher than 2.2A. The output voltage stays low when the thermal shutdown is in active. The UTC L11815B behaves like a current source when the load reaches 2.2A. But the current would fall back to 600mA to prevent excessive power loss when the load impedance value is below 0.3.Normal operation is restored when the load resistance value is higher than 0.75 . EXTERNAL CAPACITORS The UTC L11815B has an output capacitor to ground of 4.7F or more in the stable operation. Ceramic capacitors can provide the lowest ESR with the best AC performance. Aluminum Electrolytic capacitors, in contrast, have the highest ESR with poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. So we can parallel a 0.1F ceramic capacitor with a 10F Aluminum Electrolytic. The result is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize input voltage. To get an ideal effect the value of the input capacitor should be at least 0.1F. A third capacitor can be connected between the bypass pin and ground. This capacitor can be a low cost Polyester Film varies in the range of 0.001 ~ 0.01F. A larger capacitor improves the AC ripple rejection, but also makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges. At last, all the capacitors should keep a close proximity to the pins; you can achieve this with a star connection. ENABLE When pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1A. This pin behaves much like an electronic switch. 100k resistor is necessary between VEN source and EN pin when VEN is higher than VIN. (Note: There is no internal pull-up for EN PIN.) ADJUSTABLE VERSION The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to 5.0V. VADJ is trimmed to 1.242V and VOUT is given by the equation: VOUT = VADJ (1 + R1 / R2) Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1 + R2 will reduce stability. In general, R1 and R2 in the 10's of k will produce adequate stability, given reasonable layout precautions. To improve stability characteristics, keep parasitics on the ADJ pin to a minimum, and lower R1 and R2 values. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R502-352.a L11815B VIN Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT VIN VOUT R1 VOUT UTC L11815B GND EN ADJ C1=1F R2 C2=4.7F 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-R502-352.a |
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