UNISONIC TECHNOLOGIES CO., LTD P2576 LINEAR INTEGRATED CIRCUIT 3A STEP-DOWN VOLTAGE SWITCHING REGULATOR 1 TO-220B DESCRIPTION As a step-down (buck) switching regulator, the UTC P2576 provides drives 3A load. The UTC P2576 are simple because it only needs to use a minimum number of external components. Frequency compensation and a fixes-frequency oscillator are in it. UTC P2576 can perform with standard inductors, and simplifying the switch mode power supplies’ design. UTC P2576 guarantees output load conditions and ±10% on the oscillator frequency. Its external shutdown is included with 50μA standby current. As well as thermal shutdown for full protection under fault conditions, the output switch has cycle by cycle current limiting. 1 TO-252-5 1 TO-263-5 FEATURES SOP-8 * Output Current 3A * Input Voltage Range from 7V to 40V * Requires 4 External Components * Very High Efficiency * TTL Shutdown * Low Power Standby Mode * Thermal Shutdown, * Current Limit Protection * Internal Oscillator: 52 kHz Fixed Frequency HSOP-8 ORDERING INFORMATION Ordering Number Lead Free Halogen Free P2576L-xx-TB5-T P2576G-xx-TB5-T P2576L-xx-TN5-R P2576G-xx-TN5-R P2576L-xx-TQ5-R P2576G-xx-TQ5-R P2576L-xx-TQ5-T P2576G-xx-TQ5-T P2576L-xx-S08-R P2576G-xx-S08-R P2576L-xx-SH2-R P2576G-xx-SH2-R Note: xx: Output Voltage, refer to Marking Information. www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd Package Packing TO-220B TO-252-5 TO-263-5 TO-263-5 SOP-8 HSOP-8 Tube Tape Reel Tape Reel Tube Tape Reel Tape Reel 1 of 8 QW-R101-025.F P2576 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION of SOP-8/HSOP-8 VIN 1 8 GND VOUT 2 7 GND FB 3 6 GND ON/OFF 4 5 GND PIN DESCRIPTIONS PIN NO. 1 2 3 PIN NAME VIN VOUT FB 4 ON / OFF 5,6,7,8 GND PIN DESCRIPTION Input voltage Output voltage Feed back. ON / OFF select pin, when connected to the ground the chip in operating normally. Ground MARKING INFORMATION PACKAGE VOLTAGE CODE TO-220B TO-252-5 TO-263-5 50:5.0V AD:ADJ UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MARKING 2 of 8 QW-R101-025.F P2576 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R101-025.F P2576 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise specified) PARAMETER Supply Voltage Maximum Supply Voltage SYMBOL VCC VCC(MAX) RATINGS 40 45 -0.3 ~ VIN UNITS V V VON/OFF V ON / OFF Pin Input Voltage Output Voltage to Ground (Steady State) VOUT -1.0 V Power Dissipation PD Internally Limited mW Junction Temperature TJ +150 °C Operating Temperature TOPR -40 ~ +125 °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. ELECTRICAL CHARACTERISTICS (TJ=25°C, VIN=12V, ILOAD=500mA.) PARAMETER P2576 - 5.0V SYMBOL Feedback Voltage Efficiency P2576 - ADJ Feedback Voltage Efficiency ALL OUTPUT VOLTAGE Oscillator Frequency Saturation Voltage Max Duty Cycle (ON) Current Limit Output Leakage Current Quiescent Current Standby Quiescent Current ON/OFF Pin Logic Input Level ON/OFF Pin Input Current VOUT η VFB η fOSC VSAT DC ILIMIT II(LEAK) IQ ISTBY TEST CONDITIONS VIN=12V, ILOAD=0.5A 8V≤VIN≤40V, 0.5A≤ILOAD≤3.0A VIN = 12 V, ILOAD =3.0 A MIN 5.100 5.200 V V % VIN=12V, ILOAD=0.5A, VOUT =5V 1.217 1.23 1.243 8V≤VIN≤40V, 0.5A≤ILOAD≤3.0A, VOUT =5V 1.193 1.23 1.267 VIN = 12 V, ILOAD =3.0 A, VOUT =5V 77 V V % (Note 4) IOUT=3A (Note 1) (Note 2) (Note 1, 4) VIN=40V, Output=-1V (Notes 3) Output=-1V (Note 6) 4.900 4.800 TYP MAX UNIT 42 93 4.2 ON / OFF Pin=5V (OFF) 2.2 5.0 5.0 77 52 1.4 98 5.8 63 1.8 7.5 5 6.9 2 30 10 kHz V % A mA mA mA 50 200 μA 1.4 1.2 1.0 V V VIH VIL VOUT=0V VOUT=Nominal Output Voltage IIΗ ON / OFF Pin=5V (OFF) 12 30 μA IIL ON / OFF Pin=5V (ON) 0 10 μA Notes: 1. Output pin sourcing current. No diode, inductor or capacitor connected to output. 2. Feedback pin removed from output and connected to 0V. 3. Feedback pin removed from output and connected to +12V, to force the output transistor OFF. 4. The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self- protection feature lowers the Average power dissipation of P2576 by lowering the minimum duty cycle from 5% down to approximately 2%. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 8 QW-R101-025.F P2576 LINEAR INTEGRATED CIRCUIT APPLICATION CIRCUIT Feedback VIN DC Input P2576 100μH Output +5V 3A Load L1 GND + CI 100μF UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw ON/OFF + D1 1N5822 CO 680μF 5 of 8 QW-R101-025.F P2576 LINEAR INTEGRATED CIRCUIT TYPICAL TEST CIRCUIT Feedback VIN P2576 L1 Output VOUT 100μH GND ON/OFF VIN + Unregulated DC Input LOAD CI 100μF + D1 MBR360 CO 680μF CI : 100μF, 75V CO : 680μF, 25V D1 : Schottky, MBR360 L1 : 100μH R1 : 2K, 0.1% R2 : 6.12K, 0.1% Feedback VIN VIN UTC P2576 - ADJ Output L1 VOUT=5.0 V 100μH GND + 7V-40V Unregulated DC Input ON/OFF CIN 100μF R2 LOAD D1 MBR360 COUT 680μF R1 Note: VOUT = VREF (1 + R 2 = R1 ( R2 ) R1 VOUT − 1) VREF (Where VREF=1.23V, R1 between 1k and 5k.) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 8 QW-R101-025.F P2576 TYPICAL APPLICATION CIRCUIT (Ta=25°C, VCC=12V, unless otherwise specified) Output Current (A) Saturation Voltage (V) LINEAR INTEGRATED CIRCUIT Dropout Voltage VOUT=5V, Measured at Ground Pin T =25°C 22 1.5 1.0 0.5 20 18 ILOAD=3A 16 14 12 ILOAD=0.2A 10 8 0 -75 -50 -25 0 25 50 75 100 125 150 Junction Temperature (°C) 75 0 20 30 40 Input Voltage (V) 50 60 1 VIN=40V 60 50 ON/OFF PIN:5V VIN=12V 40 -25 0 25 50 75 100 125 Junction Temperature (°C) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Output Voltage Deviation(V) 70 30 -50 10 Load Transient Response Standby Quiescent Current 0 -1 Load Current(A) Standby Quiescent Current (µA) Quiescent Current 24 Quiescent Current (mA) Input-Output Differential (V) 2.0 VIN=12V, VOUT=5V@3A 3 0.01 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 Time(ms) 7 of 8 QW-R101-025.F P2576 TYPICAL APPLICATION CIRCUIT(Cont.) Quiescent Current vs. Duty Cycle 40.0 37.5 35.0 32.5 30.0 27.5 25.0 22.5 20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.5 0 VIN=7V VIN=40V ILOAD=0.5A 20 15.0 10.0 5.0 0 -5.0 -10.0 -15.0 -20.0 60 40 Duty Cycle (％) 80 100 0 20 60 40 Duty Cycle (％) 80 100 Inductor Current(A) Feedback Pin Current (nA) Output Voltage(V) 0 Feedback Voltage vs Duty Cycle 20.0 Adjustable Version Only Feedback Voltage Change (mV) Quiescent Current (mA) LINEAR INTEGRATED 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 8 of 8 QW-R101-025.F