L11815B_10 UTC | Alldatasheet
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UNISONIC TECHNOLOGIES CO., LTD L11815B Preliminary CMOS IC www.unisonic.com.tw 1 of 6 Copyright © 2010 Unisonic Technologies Co., Ltd QW-R502-352.c 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 45 μA 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 4.7μF or more. The UTC L11815B is an ideal for battery applications, such as instrumentations, portable electron ics, 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%. FEATURES * Quiescent Current (45μA 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 Packing L11815BG-xx-x-S08-R SOP-8 Tape Reel Note: xx: Output Voltage, x: Pin Code; refer to Marking Information. (1) R: Tape Reel (2) S08: SOP-8 (3) x: Pin Code (4) xx: Refer to Marking Information (5) G: Halogen Free L11815BG-xx-x-S08-R (1) Packing Type (2) Package Type (3) Pin Code (4) Output Voltage Code (5) Halogen Free
L11815B Preliminary CMOS IC UNISONIC TECHNOLOGIES CO., LTD 2 of 6 www.unisonic.com.tw Q W - R 5 0 2 - 3 5 2 . c MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING SOP-8 AD: ADJ PIN CONFIGURATION PIN DESCRIPTION PIN NO PIN NAME Pin Code DESCRIPTION 1 EN Enable pin. When pulled low, the PMOS pass transistor turns off, current consuming less than 1μA. 2 V IN Input voltage pin. It should be decoupled with 1μF or greater capacitor.
3 V OUT
LDO voltage regulator output pin. It should be decoupled with a 4.7μF or greater value low ESR ceramic capacitor. 4 ADJ Feedback output voltage for adjustable device. 5~8 GND C Ground connection pin.
L11815B Preliminary CMOS IC UNISONIC TECHNOLOGIES CO., LTD 3 of 6 www.unisonic.com.tw Q W - R 5 0 2 - 3 5 2 . c BLOCK DIAGRAM OCP OTP EA EN VIN VREF=1.2V GND ADJ VOUT
L11815B Preliminary CMOS IC UNISONIC TECHNOLOGIES CO., LTD 4 of 6 www.unisonic.com.tw Q W - R 5 0 2 - 3 5 2 . c ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Input Voltage VIN -0.3 ~ +8 V Input Voltage (EN) V EN -0.3 ~ +8 V Output Voltage V OUT -0.3 ~ V IN + 0.3 V Output Current I OUT OUTIN D V-V P mA Power Dissipation P D 810 mW Junction Temperature T J 150 °C Operating Temperature T OPR -40~+85 °C Storage Temperature T STG -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 SYMBOL RATINGS UNIT Junction to Ambient θJA 150 °C/W Junction to Case (Note) θJC 60 °C/W Note: θJC on center of molding compound if IC has on tab ELECTRICAL CHARACTERISTICS (VIN =VOUT+2V, VEN =VIN , Ta =25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Input Voltage V IN Note1 7 V Output Voltage Accuracy V OUT VEN = VEH(MIN), IOUT=1mA -1.5 1.5 % ADJ Reference Voltage V REF 1.176 1.2 1.224 V OUT OUT V VΔ IOUT=1mA VIN=VOUT+1~VOUT+2 4.0V≤VOUT -0.4 0.4 % Load Regulation OUT OUT V VΔ IOUT=1mA ~ 1.5A -1 0.2 1 % Output Current I OUT V OUT>1.2V 1500 mA Current Limit I LIM V OUT>1.2V 1500 2000 mA Short Circuit Current I SC V OUT<0.4V 750 mA Minimum Load Current I MIN 1 mA Ground Pin Current I GND I OUT=1mA ~ 1.5A 45 μA ADJ Input Bias Current I ADJ V IN = 5V , VADJ = 1.242V 1 μA 1.5V<VOUT≤2.0V 1300 mV 2.0V<VOUT ≤2.8V 800 mV Dropout Voltage V D IOUT=1.5A, VOUT=VOUT -2.0% 2.8V<VOUT 600 mV Over Temperature Shutdown OTS 150 °C Over Temperature Hysteresis OTH 30 °C Temperature Coefficient of Output Voltage TCVO 30 ppm/°C f=1kHz 50 dB Power Supply Rejection PSRR IO=100mA, CO=4.7μF ceramic f=10kHz 20 dB Output Voltage Noise eN f=10Hz~100kHz, I OUT=10mA, CO=4.7μF 30 μVrms VEH 2.0 V IN V EN Input Threshold VEL 0 0.4 V IEH V IN= 7V 0.1 μA EN Input Bias Current IEL V EN=0V, VIN= 7V 0.5 μA Shutdown Supply Current I SD V IN = 5V , VO=0V, VEN=0V 0.5 2 μA Note: V IN(MIN)=VOUT+VDROPOUT
L11815B Preliminary CMOS IC UNISONIC TECHNOLOGIES CO., LTD 5 of 6 www.unisonic.com.tw Q W - R 5 0 2 - 3 5 2 . c DETAILED DESCRIPTION The UTC L11815B of CMOS regulators insist of a PMOS pass tr ansistor, 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 referenc e in the normal operation and the normal operation is restored when the junction temperature drops below 120°C. Over-current and Thermal shutdown circuits start to work when the junction temperature is higher t han 140°C, 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 Ω.Normal operation is restored when the load resistance value is higher than 0.75 Ω. EXTERNAL CAPACITORS The UTC L11815B has an output capacitor to ground of 4.7 μF or more in the stable operation. Ceramic capacitors can provide the lowest ESR with the best AC perfo rmance. Aluminum Electrolytic capacitors, in contrast, have the highest ESR with poorest AC response. Unfortu nately, large value ceramic capacitors are comparatively expensive. So we can parallel a 0.1 μF ceramic capacitor with a 10 μF Aluminum Electrolytic. The result is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input a nd ground to stabilize input voltage. To get an ideal effect the value of the input capacitor should be at least 0.1μF. 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 ~ 0.01 μF. A larger capacitor improves t he 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 1μA. This pin behaves much like an electronic switch. 100kΩ 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 resistor s to generate an output voltage anywhere from 1.5V to 5.0V. VADJ is trimmed to 1.2V 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 Ω 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.
L11815B Preliminary CMOS IC UNISONIC TECHNOLOGIES CO., LTD 6 of 6 www.unisonic.com.tw Q W - R 5 0 2 - 3 5 2 . c TYPICAL APPLICATION CIRCUIT UTC L11815B VIN EN GND ADJ VOUTVIN VOUT C2=4.7μFC1=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.