TS2576CM5RN

T S2 5 7 6 3A / 52KHz Buck Switching Regulator T O- 2 2 0 - 5 L TO-263-5L 2 (D PAK) Pin Definition: 1. Input 2. SW Output 3. Ground 4. Feedback 5. Enable General Description TS2576 Series are step-down switching r egulators with all required ac tive functions. It is capable of driving 3A load with excellent line and load regulations . These devices are available in fixed output voltages of 3.3V, 5V and adjustable output version. TS2576 series operates at a switching frequency of 52kHz thus allowing smaller sized filter components than what would be needed with low er frequency switching regulators. It subs tantially not only reduces the area of board size but also the size of heat sink , and in some cases no heat sink is required. The ±4% tolerance on output voltage within specified input voltages and output load conditions is guaranteed. Also, the oscillator frequency accuracy is within ±10%. External shutdown is included. Featuring 70µ A (typical) standby current. The output switch includes cycle-bycycle current limiting, as well as ther mal shutdown for full protec tion under fault conditions. Features ● ● ● ● ● ● ● ● ● ● ● ● Output Voltage: 3.3V, 5V & Adjus table version Adjus table Output Voltage Range 1.23V~37V ±4% 52kHz fix ed switching frequency Voltage Mode Non-synchronous PW M control Thermal Shutdown and C urrent Limit Protection ON/OFF Shutdown Control Input High Effic iency Shor t Circuit Protec t ( SC P) Operating Voltage C an be up to 40V Output Load Current 3A Low Power Standby Mode P+ Pr oduct Enhancement Tes ted Ordering Information Part No. Package Packi ng TS2576CZ5xx C0 TO-220-5L 50pc s / T ube TS2576C M5xx RN TO-263-5L 800pc s / 13” R ee l Note: W here xx denotes voltage option, available are 50= 5.0V 33= 3.3V Leave blank for adjus table version Application ● ● ● Simple High-efficiency Step dow n Regulator On-Card Switching Regulators Positive to Negative Conver ter Absolute Maximum Rating Parameter Maximum Supply Voltage Recommend Operating Supply Voltage SW , EN Pin Input Voltage Feedback Pin Voltage Power Dissipation Output Voltage to Ground Storage Temperature Range Operating Temperature Range ESD Susceptibility (H BM) Symbol VCC VOP VSW, VEN VFB PD VOUT TST TOP Limit +4 5 4.5 to 40 -0.3 to +25 -0.3 to +25 Inter nally Limited -1 - 65 t o + 150 - 40 t o + 125 2 Unit V V V V W V o o C C kV 1/8 Version: B07 T S2 5 7 6 3A / 52KHz Buck Switching Regulator Thermal Information Parameter Thermal R esistance (Junction to Case) Thermal R esistance (Junction to Ambient) TO-220-5L TO-263-5L TO-220-5L TO-263-5L Symbol ӨJ C ӨJ A Maxi mum 2 2 65 (note 1) 50 (note 2) Unit o C/W C/W o Note1: ӨJA is measured on the PCB with minimum copper area. 2 Note2: ӨJA is measured w ith the PC B copper area (need connec t to GROUND pins) of approximately 0.5 in Electrical Specifications (All Output Voltage Version) (Ta = 25 C unless otherwise noted, VIN=12V for 3.3V, 5V, Adjus table version. ILOAD =0.5A) o Parameter Output Feedback Efficiency Output Feedback Efficiency Output Feedback Efficiency Feedback Bias Current Oscillator Frequency Soft- Start Time Current Limit Saturation Voltage ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Logic Input Current Maximum Duty Cycle (ON) Maximum Duty Cycle (OFF) Quiescent Current Standby Quiescent Current SW Pin Leakage C ur r ent SW pin = 0 SW pin = -1 5V 3.3V ADJ Symbol VFB η VFB η VFB η IFB FOSC TSS ICL VSAT VIL VIH IL IH DC IQ ISTBY ISWL Test Conditi on 4.5V≤ VIN ≤40V 0.2A≤ ILOAD ≤3A VIN =12V, ILOAD =3A, VOUT =5V 4.75V≤ VIN ≤40V 0.2A≤ ILOAD ≤3A VIN =12V, ILOAD =3A 7V≤ VIN ≤40V 0.2A≤ ILOAD ≤3A VIN =12V, ILOAD =3A VOUT = 5V ( Adjus table Version) Rising edge of EN on to ICL Pear Current, no outs ide c ircuit VFB =0V force driver on IOUT=3A, No outside circuit VFB =0V force driver on Low (regulator ON) High (regulator OFF) VLOGIC =5V ( OFF) VLOGIC =0V ( ON) VFB =0V force driver on VFB =12V force driv er off VFB =12V force driv er off ON/OFF pin=5V VIN =40V No outside circuit, VFB =12V force driv er off VIN =12V Mi n 1.180 -3.135 -4.75 --47 -5.9 --2.2 --93 ------- Ty p 1.23 77 3.3V 75 5 77 50 52 3 -1.4 1.2 1.4 12 0 98 0 5 70 0.3 7.5 Max 1.280 -3.465 -5.25 -100 58 --1.8 1.0 -30 10 --10 200 250 2 30 Unit V % V % V % nA KHz mS A V V µA % mA µA mA mA 2/8 Version: B07 T S2 5 7 6 3A / 52KHz Buck Switching Regulator Block Diagram 3/8 Version: B07 T S2 5 7 6 3A / 52KHz Buck Switching Regulator Typical Application Circuit 1. Adj ustable Output Voltage Versi on 2. Fixed Output Voltage Versi on 3. Adj ustable Output Voltage Versi on with Delayed Startup 4/8 Version: B07 T S2 5 7 6 3A / 52KHz Buck Switching Regulator Pin Function Description Vcc This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor mus t be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground Circuit ground SW Output Inter nal switch. The voltage at this pin switches between (+Vcc – Vsat) and approximately – 0.5V, with a duty cycle of approximately Vout / Vcc. To minimize coupling to sensitive circuitry, the PC board copper ar ea connec ted to this pin should be minimized. Feedback Sense the regulated output voltage to complete the feedback loop. Enable Allows the sw itching regulator circuit to be shutdow n using logic level signals thus dropping the total input supply current to approximately 100uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of Vcc) shuts the regulator dow n. If this shutdow n feature is not needed, the EN pin can be wired to the ground pin. Ther mal Considerati ons The TS2576 is available in two packages , a TO-220-5L and TO-263-5L. The TO-220-5L package needs a heat sink under most conditions . The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The TS2576 junc tion temper ature rises above ambient temperature for a 3A load and different input and output voltages . The data for these curves w as taken o with the TS2576C Z5 ( TO-220-5L package) operating as a buck switching regulator in an ambient temperature of 25 C (still air). These temperature rise numbers are all approximate and there are many factors that can affect these temperatures. Higher ambient temperatures require more heat sinking. The TO-263-5L surface mount package tab is designed to be soldered to the copper on a printed circuit board. The copper and the board are the heat sink for this package and the other heat producing components , such2as the catch diode and inductor . The PC board copper area that the package is soldered to should be at leas t 0.8 in , and ideally should have 2 or more square inches of 2oz . 2Additional copper area improves the ther mal characteristics , but with copper areas gr eater than approximately 6 in , only small improvements in heat dissipation are realized. If further ther mal improvements are needed, double sided, multilayer PC board with large copper areas and/or airflow are recommended. The TS2576 ( TO-263-5L package) junction temperature rise above ambient temperature with a 3A load for various input and output voltages. This data was taken with the circuit operating as a buck switching regulator with all components mounted on a PC board to simulate the junction temperature under actual operating conditions. This curve can be used for a quick check for the approximate junc tion temperature for various conditions, but be aware that there are many factors that can affect the junc tion temperature. When load currents higher than 3A are used, double sided or multilayer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages . For the bes t thermal per for mance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (Once exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower ther mal resistance) to the surrounding air , and moving air lowers the ther mal resistance even further. 5/8 Version: B07 T S2 5 7 6 3A / 52KHz Buck Switching Regulator TO-220-5L Mechanical Drawing DIM A B C D E F G H I J K L M N TO-220-5L D IMEN SION MILLIMETER S INCH ES MIN MAX MIN MAX 10.00 10.50 0.394 0.413 3.240 4.440 0.128 0.175 2.440 2.940 0.096 0.116 0.260 1.020 0.010 0.040 1.570 1.830 0.062 0.072 13.31 14.13 0.524 0.556 4.475 5.225 0.176 0.206 1.170 1.370 0.046 0.054 27.60 29.44 1.087 1.159 2.175 2.925 0.086 0.115 0.297 0.477 0.012 0.019 8.280 8.800 0.326 0.346 6.010 6.510 0.237 0.256 14.29 15.31 0.563 0.603 Marking Diagram Y M = Year Code = Month C ode (A=Jan, B =Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oc t, K=Nov , L=Dec) L = Lo t C ode XXX = Voltage Code (3.3=3.3V, 5.0=5V) = Package Code for Adjustable type (CZ5 = TO-220-5L) 6/8 Version: B07 T S2 5 7 6 3A / 52KHz Buck Switching Regulator TO-263-5L Mechanical Drawing DIM A B C D E F G H I J TO-263-5L D IMEN SION MILLIMETER S INCH ES MIN MAX MIN MAX 9.70 10.54 0.382 0.415 14.60 15.87 0.575 0.625 0.69 0.94 0.027 0.037 1.524 2.032 0.060 0.080 4.30 4.70 0.169 0.185 1.22 1.40 0.048 0.055 2.24 2.82 0.088 0.111 0.36 0.56 0.014 0.022 8.50 9.20 0.330 0.362 1.40 MAX 0.055 MAX Marking Diagram Y M = Year Code = Month C ode (A=Jan, B =Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oc t, K=Nov , L=Dec) L = Lo t C ode XXX = Voltage Code (3.3=3.3V, 5.0=5V) = Package Code for Adjustable type (CM5 = TO-263-5L) 7/8 Version: B07 T S2 5 7 6 3A / 52KHz Buck Switching Regulator Notice Specifications of the produc ts displayed herein are s ubject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Infor mation contained herein is intended to pr ovide a product description only. N o license, express or implied, to any intellectual proper ty rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products , TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a par ticular purpose, merchantability, or infringement of any patent, copyright, or other intellectual proper ty right. The products shown herein are not designed for use in medical, life-saving, or life-sus taining applications . C ustomers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. 8/8 Version: B07