TS2596 Taiwan Semiconductor 3A / 150kHz Step-Down DC-DC Converter GENERAL DESCRIPTION FEATURES The TS2596 Series are step-down switching regulators Output voltage: 3.3V, 5V & adjustable version with all required active functions. It is capable of driving Adjustable output voltage range 1.23V~38.5V 3A load with excellent line and load regulations. These 150kHz fixed switching frequency devices are available in fixed output voltages of 3.3V, 5V, Voltage mode Non-synchronous PWM control and an adjustable output version. Thermal shutdown and current limit protection The TS2596 series operates at a switching frequency of ON/OFF shutdown control input 150kHz thus allowing smaller sized filter components than Short circuit protect (SCP) what would be needed with lower frequency switching Operating voltage can be up to 40V regulators. It substantially not only reduces the area of Output load current 3A board size but also the size of heat sink, and in some Low power standby mode cases no heat sink is required. The 4% tolerance on frequency accuracy is within 10%. External shutdown is Built-in switching transistor on chip Compliant to RoHS Directive 2011/65/EU and in accordance to WEEE 2002/96/EC. Halogen-free according to IEC 61249-2-21 included. Featuring 100A (typical) standby current. The APPLICATION output switch includes cycle-by-cycle current limiting, as Simple High-efficiency Step down Regulator well as thermal shutdown for full protection under fault On-Card Switching Regulators conditions. Positive to Negative Converter output voltage within specified input voltages and output load conditions is guaranteed. Also, the oscillator 2 TO-263-5L (D PAK) Pin Definition: 1. Input 2. SW Output 3. Ground 4. Feedback 5. Enable Notes: Moisture sensitivity level: level 3. Per J-STD-020 TYPICAL APPLICATIN CIRCUIT Adjustable Output Voltage Version VOUT = VFB x (1 + R1 ), VFB = 1.23V, R2 = 0.7k ~ 3k R2 1 Version: G1608 TS2596 Taiwan Semiconductor ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL LIMIT UNIT Maximum Supply Voltage VCC +45 V Recommend Operating Supply Voltage VOP +4.5 to +40 V VSW , VEN -0.3 to +40 V Feedback Pin Voltage VFB -0.3 to +12 V Power Dissipation PD Internally Limited W VOUT -1 V Storage Temperature Range TST -65 ~ +150 C Operating Temperature Range TOP -40 ~ +125 C 2 kV SYMBOL LIMIT UNIT Junction to Case Thermal Resistance RJC 2 C/W Junction to Ambient Thermal Resistance RJA 50 SW, EN Pin Input Voltage Output Voltage to Ground ESD Susceptibility (HBM) THERMAL INFORMATION PARAMETER C/W 2 Note: RJA is measured with the PCB copper area (need connect to GROUND pins) of approximately 1.5 in (Multi-layer) ELECTRICAL CHARACTERISTICS (VIN = 12V for 3.3V, 5V, Adjustable Version, ILOAD = 0.3A, TA = 25C unless otherwise noted) PARAMETER CONDITION Output Feedback ADJ Efficiency Output Feedback 3.3V 4.5V VIN 40V 0.2A ILOAD 3A VIN = 12V, ILOAD = 3A, VOUT = 5V 4.75V VIN 40V 0.2A ILOAD 3A Efficiency VIN = 12V, ILOAD = 3A Output Feedback 7V VIN 40V 0.2A ILOAD 3A 5V SYMBOL MIN TYP MAX UNIT VFB 1.180 1.23 1.280 V -- 77 -- % VFB 3.135 3.3V 3.465 V -- 75 -- % VFB 4.75 5 5.25 V Efficiency VIN = 12V, ILOAD = 3A -- 80 -- % Feedback Bias Current VFB =1.3V (Adj version only) IFB -- 10 100 nA FOSC 127 150 173 kHz Oscillator Frequency Soft-Start Time Rising edge of EN on to ICL TSS -- 3 -- ms Current Limit Pear Current, no outside circuit VFB =0V force driver on ICL 3.3 -- -- A When current limit occurred o and VFB <0.5V, Ta = 25 C FSCP 110 150 173 KHz Saturation Voltage IOUT=3A, No outside circuit VFB =0V force driver on VSAT -- 1.15 1.50 V ON/OFF Pin Logic Input Low (regulator ON) VIL -- 1.3 0.6 V Threshold Voltage High (regulator OFF) VIH 2.0 1.3 -- V Oscillator Frequency of Short Circuit Protect 2 Version: G1608 TS2596 Taiwan Semiconductor ELECTRICAL CHARACTERISTICS (VIN = 12V for 3.3V, 5V, Adjustable Version, ILOAD = 0.3A, TA = 25C unless otherwise noted) PARAMETER CONDITION ON/OFF Pin Logic Input Current SYMBOL MIN TYP MAX VLOGIC =2.5V (OFF) IH -- 5 15 VLOGIC =0.5V (ON) IL -- 0.02 5 -- 100 -- -- 0 -- -- 5 10 Maximum Duty Cycle (ON) VFB =0V force driver on Maximum Duty Cycle (OFF) VFB =12V force driver off Quiescent Current VFB =12V force driver off ON/OFF pin=5V Standby Quiescent Current SW Pin Leakage Current DC IQ ISTBY VIN =40V SW pin = 0 No outside circuit, VFB =12V force driver off SW pin = -1 VIN =12V ISWL --- 80 200 250 UNIT A % mA A -- 0.3 2 mA -- 7.5 30 mA ORDERING INFORMATION OUTPUT VOLTAGE PART NO. PACKAGE 2 PACKING 3.3V TS2596CM533 RNG TO-263-5L (D PAK) 800pcs / 13" Reel 5.0V TS2596CM550 RNG TO-263-5L (D2PAK) 800pcs / 13" Reel ADJ 2 TS2596CM5 RNG TO-263-5L (D PAK) 800pcs / 13" Reel BLOCK DIAGRAM 3 Version: G1608 TS2596 Taiwan Semiconductor PIN FUNCTION DESCRIPTION VCC This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground Circuit ground SW Output Internal 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 area connected to this pin should be minimized. Feedback Sense the regulated output voltage to complete the feedback loop. Enable Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 100A. 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 down. If this shutdown feature is not needed, the EN pin can be wired to the ground pin. Thermal Considerations The TS2596 (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 junction temperature for various conditions, but be aware that there are many factors that can affect the junction 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 best thermal performance, 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 thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. 4 Version: G1608 TS2596 Taiwan Semiconductor TYPICAL APPLICATIN CIRCUIT Adjustable Output Voltage Version VOUT = VFB x (1 + R1 ), VFB = 1.23V, R2 = 0.7k ~ 3k R2 VOUT R2 R1 5.0V 1.5k 4.7k 3.3V 1.5k 2.5k 2.5V 1.5k 1.5k Fixed Output Voltage Version L1 recommend value (IOUT=3A,) VOUT 2.5V 3.3V 5V 12V VIN=12V 33H 33H 33~47H NA VIN=24V 33H 33H 47H 68H 5 Version: G1608 TS2596 Taiwan Semiconductor ELECTRICAL CHARACTERISTICS CURVES (TC = 25C unless otherwise noted) Figure 1. Output Ripple Figure 2. Power On Test Wave (VIN=12V, VOUT=5V, IO=3A) (VIN=12V, VOUT=5V, IO=3A) Figure 3. Load Transient Response Figure 4. EN On Test Wave (VIN=12V, VOUT=5V, IO=0.2~3A) (VIN=12V, VOUT=5V, IO=3A) Figure 5. Efficiency Figure 6. Efficiency 6 Version: G1608 TS2596 Taiwan Semiconductor PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) 2 TO-263-5L (D PAK) SUGGESTED PAD LAYOUT (Unit: Millimeters) MARKING DIAGRAM Y M = Year Code = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr S =May T =Jun U =Jul V =Aug W =Sep X =Oct Y =Nov Z =Dec L = Lot Code XX = Voltage Code (3.3=3.3V, 5.0=5V) = Package Code for Adjustable type (CM5 = TO-263-5L) 7 Version: G1608 TS2596 Taiwan Semiconductor Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property 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 particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers 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 Version: G1608