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 ● High efficiency what would be needed with lower frequency switching ● Short circuit protect (SCP) regulators. It substantially not only reduces the area of ● Operating voltage can be up to 40V board size but also the size of heat sink, and in some ● Output load current 3A cases no heat sink is required. The ±4% tolerance on ● Low power standby mode output voltage within specified input voltages and output ● Built-in switching transistor on chip load conditions is guaranteed. Also, the oscillator frequency accuracy is within ±10%. External shutdown is APPLICATION included. Featuring 100μA (typical) standby current. The ● Simple High-efficiency Step down Regulator output switch includes cycle-by-cycle current limiting, as ● On-Card Switching Regulators well as thermal shutdown for full protection under fault ● Positive to Negative Converter conditions. Pin Definition: 1. Input 2. SW Output 3. Ground 4. Feedback 5. Enable 2 TO-220-5L TO-263-5L (D PAK) Notes: Moisture sensitivity level: level 3. Per J-STD-020 TYPICAL APPLICATIN CIRCUIT Adjustable Output Voltage Version VIN=12V 1 C1 470uF C2 0.1uF 4 5 Vout=5.0V/3A 2 33uH U1 1 Vcc 2 SW L1 Vss 3 D1 B340A FB EN R1 4.7K C3 470uF C6 0.1uF R2 1.5K ON/OFF VOUT = VFB × (1 + R1 ), VFB = 1.23V, R2 = 0.7K ~ 3K R2 Document Number: DS_P0000277 1 Version: F15 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 LIMIT UNIT SW, EN Pin Input Voltage Output Voltage to Ground ESD Susceptibility (HBM) THERMAL INFORMATION PARAMETER SYMBOL TO-220-5L Junction to Case Thermal Resistance TO-263-5L 2 RӨJC TO-220-5L Junction to Ambient Thermal Resistance TO-263-5L °C/W 2 50 RӨJA °C/W 50 2 Note: RӨJA 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 = 25°C 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 η -- 77 -- % VFB 3.135 3.3V 3.465 V η -- 75 -- % VFB 4.75 5 5.25 V Efficiency VIN = 12V, ILOAD = 3A η -- 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 IOUT=3A, No outside circuit VFB =0V force driver on VSAT -- 1.15 1.50 V Oscillator Frequency of Short Circuit Protect Saturation Voltage Document Number: DS_P0000277 2 Version: F15 TS2596 Taiwan Semiconductor ELECTRICAL CHARACTERISTICS (VIN = 12V for 3.3V, 5V, Adjustable Version, ILOAD = 0.3A, TA = 25°C unless otherwise noted) PARAMETER CONDITION SYMBOL MIN TYP MAX ON/OFF Pin Logic Input Low (regulator ON) VIL -- Threshold Voltage High (regulator OFF) VIH 2.0 VLOGIC =2.5V (OFF) IH -- 5 15 VLOGIC =0.5V (ON) IL -- 0.02 5 -- 100 -- -- 0 -- -- 5 10 ON/OFF Pin Logic Input Current 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 --- 1.3 80 0.6 -- UNIT V µA % 200 250 mA µA -- 0.3 2 mA -- 7.5 30 mA ORDERING INFORMATION OUTPUT VOLTAGE 3.3V PART NO. TS2596CZ533 C0G PACKAGE PACKING TO-220-5L 50pcs / Tube 2 3.3V TS2596CM533 RNG TO-263-5L (D PAK) 800pcs / 13” Reel 5.0V TS2596CZ550 C0G TO-220-5L 50pcs / Tube 5.0V TS2596CM550 RNG ADJ TS2596CZ5 C0G ADJ TS2596CM5 RNG 2 TO-263-5L (D PAK) 800pcs / 13” Reel TO-220-5L 50pcs / Tube 2 TO-263-5L (D PAK) 800pcs / 13” Reel Note: 1. Compliant to RoHS Directive 2011/65/EU and in accordance to WEEE 2002/96/EC. 2. Halogen-free according to IEC 61249-2-21 definition. BLOCK DIAGRAM Document Number: DS_P0000277 3 Version: F15 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 100µA. 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 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 TS2596 junction temperature rises above ambient temperature for a 3A load and different input and output voltages. The data for these curves was taken with the TS2596 (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, such as the 2 catch diode and inductor. The PC board copper area that the package is soldered to should be at least 0.8 in , and ideally should have 2 or more square inches of 2 oz. Additional copper area improves the thermal characteristics, 2 but with copper areas greater than approximately 6 in , only small improvements in heat dissipation are realized. If further thermal improvements are needed, double sided, multilayer PC board with large copper areas and/or airflow are recommended. 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. Document Number: DS_P0000277 4 Version: F15 TS2596 Taiwan Semiconductor TYPICAL APPLICATIN CIRCUIT Adjustable Output Voltage Version VIN=24V 1 C1 470uF 4 C2 0.1uF 5 Vout=5.0V/3A 2 47uH U1 1 Vcc 2 SW L1 Vss 3 R1 4.7K D1 B340A FB C3 470uF C6 0.1uF R2 1.5K EN VOUT = VFB × (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 VIN=24V 1 C2 0.1uF C1 470uF 4 5 Vout=5.0V/3A 2 47uH U1 1 Vcc 2 SW L1 Vss 3 D1 B340A FB C3 470uF C6 0.1uF EN L1 recommend value (IOUT=3A,) VOUT 2.5V 3.3V 5V 12V VIN=12V 33uH 33uH 33~47uH NA VIN=24V 33uH 33uH 47uH 68uH Document Number: DS_P0000277 5 Version: F15 TS2596 Taiwan Semiconductor ELECTRICAL CHARACTERISTICS CURVES (TC = 25°C 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 Document Number: DS_P0000277 6 Version: F15 TS2596 Taiwan Semiconductor PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) TO-220-5L MARKING DIAGRAM = Year Code = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr V =Aug S =May T =Jun U =Jul 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 (CZ5 = TO-220-5L) Y M Document Number: DS_P0000277 7 Version: F15 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) Document Number: DS_P0000277 8 Version: F15 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. Document Number: DS_P0000277 9 Version: F15