P2576_1109 UTC | Alldatasheet
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UNISONIC TECHNOLOGIES CO., LTD P2576 LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 8 Copyright © 2011 Unisonic Technologies Co., Ltd QW-R101-025.G 3A STEP-DOWN VOLTAGE SWITCHING REGULATOR 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 50 μA standby current. As well as thermal shutdown for full protection under fault conditions, the output switch has cycle by cycle current limiting. FEATURES * 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 TO-220B TO-263-5 SOP-8 HSOP-8 TO-220-5 ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free P2576L-xx-TA5-T P2576G-xx-TA5-T TO-220-5 Tube P2576L-xx-TB5-T P2576G-xx-TB5-T TO-220B Tube P2576L-xx-TQ5-R P2576G-xx-TQ5-R TO-263-5 Tape Reel P2576L-xx-TQ5-T P2576G-xx-TQ5-T TO-263-5 Tube P2576L-xx-S08-R P2576G-xx-S08-R SOP-8 Tape Reel P2576L-xx-S08-T P2576G-xx-S08-T SOP-8 Tube P2576L-xx-SH2-R P2576G-xx-SH2-R HSOP-8 Tape Reel P2576L-xx-SH2-T P2576G-xx-SH2-T HSOP-8 Tube Note: xx: Output Voltage, refer to Marking Information.
P2576 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 8 www.unisonic.com.tw QW-R101-025.G PIN CONFIGURATION of SOP-8/HSOP-8
1 GND
PIN DESCRIPTIONS FOR SOP-8/HSOP-8 PIN NO. PIN NAME PIN DESCRIPTION
1 VIN Input voltage
2 V OUT Output voltage
3 FB Feed back. 4 OFF/ON OFF/ON select pin, when connected to the ground the chip in operating normally. 5,6,7,8 GND Ground FOR TO-220B/TO-220-5/TO-263-5 PIN NO. PIN NAME PIN DESCRIPTION
3 GND Ground
4 FB Feed back. 5 OFF/ON OFF/ON select pin, when connected to the ground the chip in operating normally. MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING TO-220B TO-220-5 TO-263-5 50:5.0V AD:ADJ
P2576 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 8 www.unisonic.com.tw QW-R101-025.G BLOCK DIAGRAM
P2576 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 8 www.unisonic.com.tw QW-R101-025.G ABSOLUTE MAXIMUM RATINGS (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNITS Supply Voltage V CC 40 V Maximum Supply Voltage V CC(MAX) 45 V OFF/ON Pin Input Voltage VON/OFF -0.3 ~ VIN V Output Voltage to Ground (Steady State) V OUT -1.0 V Power Dissipation P D Internally Limited mW Junction Temperature T J +150 °C Operating Temperature T OPR -40 ~ +125 °C Storage Temperature T STG -65 ~ +150 °C Note: Absolute maximum ratings are those values be yond 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 SYMBOL TEST CONDITIONS MIN TYP MAX UNIT P2576 - 5.0V Feedback Voltage VOUT VIN=12V, ILOAD=0.5A 4.900 5.0 5.100 V Efficiency η V IN = 12 V, ILOAD =3.0 A 77 % P2576 - ADJ Feedback Voltage VFB VIN=12V, ILOAD=0.5A, VOUT =5V 1.217 1.23 1.243 V Efficiency η V IN = 12 V, ILOAD =3.0 A, VOUT =5V 77 % ALL OUTPUT VOLTAGE Oscillator Frequency f OSC (Note 4) 42 52 63 kHz Saturation Voltage V SAT I OUT=3A (Note 1) 1.4 1.8 V Max Duty Cycle (ON) DC (Note 2) 93 98 % Current Limit I LIMIT (Note 1, 4) 4.2 5.8 6.9 A Output Leakage Current I I(LEAK) VIN=40V, Output=-1V (Notes 3) 2 mA Output=-1V 7.5 30 mA Quiescent Current IQ (Note 6) 5 10 mA Standby Quiescent Current I STBY OFF/ON Pin=5V (OFF) 50 200 μA ON/OFF Pin Logic Input Level VIH V OUT=0V 2.2 1.4 V VIL V OUT=Nominal Output Voltage 1.2 1.0 V ON/OFF Pin Input Current IIΗ OFF/ON Pin=5V (OFF) 12 30 μA IIL OFF/ON Pin=5V (ON) 0 10 μA Notes: 1. Output pin sourcing current. No diode, inductor or capacitor connected to output. Feedback pin removed from output and connected to 0V. Feedback pin removed from output and connected to +12V, to force the output transistor OFF. 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%.
P2576 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 8 www.unisonic.com.tw QW-R101-025.G APPLICATION CIRCUIT Feedback VIN GND CI 100μF ON/OFF Output 100μH +5V 3A Load CO 680μF1N5822 DC Input P2576
P2576 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 8 www.unisonic.com.tw QW-R101-025.G TYPICAL TEST CIRCUIT VIN GND CI 100μF Feedback Output L1 VOUT + CO 680μFMBR360 100μH LOADON/OFF P2576 VIN Unregulated DC Input CI : 100μF, 75V CO : 680μF, 25V D1 : Schottky, MBR360 L1 : 100μH R1 : 2K, 0.1% R2 : 6.12K, 0.1% VIN UTC P2576 - ADJ Output L1 COUT 680μF VOUT=5.0 V GND ON/OFF VIN MBR360 +7V-40V Unregulated DC Input CIN 100μF LOAD 100μH Feedback Note: )R R(VV REFOUT 21+= V(RR REF OUT 112 −= ( W h e r e VREF=1.23V, R1 between 1k and 5k.)
P2576 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 of 8 www.unisonic.com.tw QW-R101-025.G TYPICAL APPLICATION CIRCUIT (TA=25°C, VCC=12V, unless otherwise specified) Saturation Voltage (V) Output Current (A) Dropout Voltage 2.0 1.5 1.0 0.5 -75 0 25 125 150 Junction Temperature (°C) Input-Output Differential (V) -50 -25 100 50 75 Input Voltage (V) Quiescent Current (mA) 10 20 30 40 50 60 Quiescent Current VOUT=5V, Measured at Ground Pin T =25°C22 ILOAD=3A ILOAD=0.2A Standby Quiescent Current 0 25 125 Junction Temperature (°C) -50 -25 10050 75 Standby Quiescent Current (µA) ON/OFF PIN:5V VIN=40V VIN=12V Output Voltage Deviation(V) Time(ms) Load Transient Response Load Current(A) 0.01 VIN=12V, VOUT=5V@3A
P2576 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 8 of 8 www.unisonic.com.tw QW-R101-025.G TYPICAL APPLICATION CIRCUIT(Cont.) 20.0 Duty Cycle (％) Quiescent Current (mA) 2.5 5.0 17.5 15.0 12.5 10.0 7.5 20 40 60 80 100 Quiescent Current vs. Duty Cycle 20.0 Duty Cycle (％) Feedback Voltage Change (mV)-15.0 -10.0 15.0 10.0 -5.0 20 40 60 80 100 Feedback Voltage vs Duty Cycle 5.0 -20.0ILOAD=0.5A 40.0 22.5 25.0 37.5 35.0 32.5 30.0 27.5 Adjustable Version Only VIN=7V VIN=40V Feedback Pin Current (nA) Output Voltage(V) Inductor Current(A) 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 writ ten 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.