UCC283TDTR-3



 


     
    
      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 D Precision Positive Linear Series Pass D D D D D D D D D Voltage Regulation 0.45 V Dropout at 3 A 50 mV Dropout at 10 mA Quiescent Current Under 650 µA Irrespective of Load Adjustable (5-Lead) Output Voltage Version Fixed (3-Lead) Versions for 3.3-V and 5-V Outputs Logic Shutdown Capability Short-Circuit Power Limit of (3% × VIN × ISHORT) Low VOUT to VIN Reverse Leakage Thermal Shutdown TO−263−3 TD PACKAGE (FRONT VIEW) TO−263−5 TD PACKAGE (FRONT VIEW) 5 4 3 2 1 VOUT ADJ GND CT VIN 3 2 1 VOUT GND VIN TO−220−5 T PACKAGE (FRONT VIEW) + 5 4 3 2 1 VOUT ADJ GND CT VIN TO−220−3 T PACKAGE (FRONT VIEW) description The UCC283−3/−5/−ADJ family of positive linear series pass voltage regulators are tailored for low-drop-out applications where low quiescent power is important. Fabricated with a BiCMOS technology ideally suited for low input-to-output differential applications, the UCC283−5 passes 3 A while requiring only 0.45 V of typical input voltage headroom (ensured 0.6-V dropout). + 3 2 VOUT 1 VIN GND These regulators include reverse voltage sensing that prevents current in the reverse direction. Quiescent current is always less than 650 µA. These devices have been internally compensated in such a way that the need for a minimum output capacitor has been eliminated. UCC283−3 and UCC283−5 versions are in 3-lead packages and have preset outputs at 3.3 V and 5.0 V respectively. The output voltage is regulated to 1.5% at room temperature. The UCC283−ADJ version, in a 5-lead package, regulates the output voltage programmed by an external resistor ratio. Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning off after a tON time delay. The device then stays off for a period, tOFF, that is 32 times the tON delay. The device then begins pulsing on and off at the tON/(tON+tOFF) duty cycle of 3%. This drastically reduces the power dissipation during short-circuit and means heat sinks need only accommodate normal operation. On the 3-leaded versions of the device tON is fixed at 750 µs, on the adjustable 5-leaded versions an external capacitor sets the on time. The off time is always 32 × tON. The external timing control pin, CT, on the 5-leaded versions also serves as a shutdown input when pulled low. Internal power dissipation is further controlled with thermal overload protection circuitry. Thermal shutdown occurs if the junction temperature exceeds 165°C. The chip remains off until the temperature has dropped 20°C. The UCC283 series is specified for operation over the industrial range of −40°C to 85°C, and the UCC383 series is specified from 0°C to 70°C. These devices are available in 3- and 5-pin TO−220 and TO−263 power packages. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. Copyright  1998−2004, Texas Instruments Incorporated 
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      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 AVAILABLE OPTIONS(1) TA OUTPUT VOLTAGE (V) MIN −40°C −40 C to 85 85°C C TYP MAX TO−220−5 TD T 3.22 3.3 3.58 UCC283TD−3 — UCC283T−3 4.875 5.00 5.125 UCC283TD−5 — UCC283T−5 — — UCC283TD−ADJ — UCC283T−ADJ — UCC383T−3 — ADJ 0°C 70°C 0 C to 70 C PACKAGE DEVICES TO−263−5(2) TO−220−3 TO−263−3(2) — 3.22 3.3 3.58 UCC383TD−3 4.875 5.00 5.125 UCC383TD−5 — UCC383T−5 — — UCC383TD−ADJ — UCC383T−ADJ ADJ 1. For more package and ordering information, see the Package Option Addendum located at the end of this data sheet. 2. For 50 piece reel, add KTTT (e.g., UCC283TDKTTT−3); for 500 piece reel, add TR (e.g., UCC283TDTR−3). functional block diagram VIN *5 LEADED VERSION ONLY (ADJ) VOUT VPUMP CURRENT LIMIT ADJ* 4 A/ 7 A CURRENT REFERENCE R2 + + 0.65 V SD/CT* R1 1.25 V 3% DUTY CYCLE CURRENT LIMIT TIMER GND REVERSE VOLTAGE SENSE UVLO THERMAL SHUTDOWN R2 R1 0 OPEN UCC283−3 82k 50k UCC283−5 150k 50k UCC283−ADJ UDG−98133 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 


 


     
    
      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 electrical characteristics TA = 0°C to 70°C for the UCC383−x series, TA = −40°C to 85°C for the UCC283−x, VVIN = VVOUT + 1.5 V, IOUT = 10 mA, CIN = 10 mF, COUT = 22 mF. For the UCC283−ADJ, VVIN = 6.5 V, VOUT = 5.0 V, CT = 750 pF, TJ = TA unless otherwise stated PARAMETER TEST CONDITIONS MIN TYP MAX UNITS UCC283−5 Fixed 5 V, 3 A Family Output voltage Line regulation TJ = 25°C Over temperature 4.925 4.875 Load regulation VVIN = 5.15 V to 9 V IOUT = 10 mA to 3 A Dropout voltage, VDROPOUT = VVIN − VVOUT IOUT = 3 A, IOUT = 1.5 A, VOUT = 4.85 V VOUT = 4.85 V IOUT = 10 mA, VVOUT = 0 V VOUT = 4.85 V Peak current limit Overcurrent threshold Current limit duty cycle Overcurrent time out, tON VVOUT = 0 V VVOUT = 0 V Quiescent current No load Reverse leakage current Undervoltage lockout 5 1 V < VVIN < VVOUT, VVOUT ≤ 5.1 V, at VVOUT VIN where VOUT passes current 5.075 5.125 2 V V 10 mV 10 20 mV 0.4 0.6 V 0.2 0.45 V 50 150 mV 4 7 10 A 3 4 5.5 A 3% 5% 400 750 1400 µs 400 650 µA 30 75 µA 2.5 2.8 3 V 3.25 3.3 3.35 V UCC283−3 Fixed 3.3 V, 3 A Family Output voltage Line regulation voltage TJ = 25°C Over temperature 3.22 3.38 V Load regulation voltage VVIN = 3.45 V to 9 V IOUT = 10 mA to 3 A 7 15 mV VOUT = 3.15 V 0.5 1 V Dropout voltage, VDROPOUT = VVIN − VVOUT IOUT = 3A, IOUT = 1.5A, VOUT = 3.15 V 0.25 0.6 V IOUT = 10mA, VVOUT = 0 V VOUT = 3.15 V 50 150 mV Peak current limit 7 10 A A 4 Overcurrent threshold Current limit duty cycle 3 Overcurrent time out, tON VVOUT = 0 V VVOUT = 0 V Quiescent current No load Reverse leakage current Undervoltage lockout 400 1 V < VVIN < VVOUT, VVOUT ≤ 3.35 V at VVOUT VIN where VOUT passes current POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2.5 2 7 mV 4 5.5 3% 5% 750 1400 µs 400 650 µA 30 75 µA 2.8 3 V 3 


 


     
    
      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 electrical characteristics TA = 0°C to 70°C for the UCC383−x series, TA = −40°C to 85°C for the UCC283−x, VVIN = VVOUT + 1.5 V, IOUT = 10 mA, CIN = 10 mF, COUT = 22 mF. For the UCC283−ADJ, VVIN = 6.5 V, VOUT = 5.0 V, CT = 750 pF, TJ = TA unless otherwise stated PARAMETER TEST CONDITIONS MIN TYP MAX UNITS UCC283−ADJ Adjustable Output, 3 A Family Regulating voltage at ADJ pin Line regulation voltage, at ADJ input TJ = 25°C 1.23 Over temperature 1.22 Load regulation voltage, at ADJ input VVIN = VVOUT + 150 mV to 9 V IOUT = 10 mA to 3 A Dropout voltage, VDROPOUT = VIN − VOUT VOUT = 4.85 V, VOUT = 4.85 V, IOUT = 3 A IOUT = 1.5 A VOUT = 4.85 V, VVOUT = 0 V IOUT = 10 mA Peak current limit Overcurrent threshold Current limit duty cycle Overcurrent time out, tON Reverse leakage current VVOUT = 0 V VVOUT = 0 V No load At CT input Quiescent current in shutdown VVIN = 9 V VIN where VOUT passes current UVLO V V 3 mV mV 2 5 0.4 0.6 V 0.2 0.45 V 50 150 mV 4 7 10 A 3 4 5.5 A 3 5 % 300 575 1200 µs 30 100 µA 20 250 nA 400 650 µA Bias current at ADJ input Shutdown threshold 1.27 1.28 1 1 V < VVIN < VVOUT VVOUT ≤ 9 V, at VVOUT Quiescent current 1.25 0.25 0.65 V 40 75 µA 2.5 2.8 3 V absolute maximum ratings over operating free-air temperature (unless otherwise noted)† Input voltage VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 V CT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 3 V ADJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 9 V Storage Temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 150°C Lead Temperature (soldering, 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 


 


     
    
      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 pin descriptions ADJ: Adjust pin for the UCC283−ADJ version only. Feedback pin for the linear regulator. Program the output voltage with R1 connected from ADJ to GND and R2 connected from VOUT to ADJ. Output voltage is given by: V OUT + 1.25 V (R1 ) R2) R1 CT: Short-circuit timing capacitor and shutdown input for the UCC283−ADJ version. Pulling CT below 0.25 V turns off the regulator and places it in a low quiescent-current mode. A timing capacitor, C, from CT to GND programs the duration of the pulsed short-circuit on-time. On-time, tON, is approximately given by: t ON + 750 k C GND: Reference ground. VIN: Input voltage, This pin must be bypassed with a low ESL/ESR 1-µF or larger capacitor to GND. VIN can range from (VOUT + VDROPOUT) to 9 V. If VIN is reduced to zero while VOUT is held high, the reverse leakage from VOUT to VIN is less than 75µA. VOUT: Regulated output voltage. A bypass capacitor is not required at VOUT, but may be desired for good transient response. The bypass capacitor must not exceed a maximum value in order to insure the regulator can start. APPLICATION INFORMATION overview The UCC383 family of low dropout linear (LDO) regulators provide a regulated output voltage for applications with up to 3 A of load current. The regulators feature a low dropout voltage and short-circuit protection, making their use ideal for demanding high-current applications requiring fault protection. short-circuit-protection The UCC383 provides unique short-circuit protection circuitry that reduces power dissipation during a fault. When an overload situation is detected, the device enters a pulsed mode of operation at 3% duty cycle reducing the heat sink requirements during a fault. The UCC383 has two current thresholds that determine its behavior during a fault as shown in Figure 1. When the regulator current exceeds the overcurrent threshold for a period longer than tON, the UCC383 shuts off for a period (tOFF) which is 32 × tON. During an overload, the regulator actively limits the maximum current to the peak current limit value. The peak current limit is nominally 3 A greater than the overcurrent threshold. The regulator continues in pulsed mode until the fault is cleared as illustrated in Figure 1. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 


 


     
    
      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION PEAK CURRENT LIMIT OUTPUT CURRENT OVERLOAD OVER− CURRENT THRESHOLD IO (NOM) VO (NOM) ROLICL OUTPUT VOLTAGE TON 32 TON TON 32 TON TON 32 TON Figure 1. UCC383 Short-Circuit Timing A capacitive load on the regulator’s output appears as a short-circuit during start-up. If the capacitance is too large, the output voltage does not come into regulation during the initial tON period and the UCC383 enters pulsed mode operation. The peak current limit, tON period, and load characteristics determine the maximum value of output capacitor that can be charged. For a constant current load the maximum output capacitance is given as follows: C OUT(max) ǒ CL * ILOADǓ + I t V ON Farads OUT (1) For worst case calculations, the minimum values of on time (tON) and peak current limit (ICL) should be used. The adjustable version allows the tON time to be adjusted with a capacitor on the CT pin: t ON(adj) + 750, 000 C (m Farad) microseconds (2) For a resistive load (RLOAD) the maximum output capacitor can be estimated from: t C OUT(max) + ȡ R 6 ON(sec) LOAD ȏnȧ ȣ ȧ Ȥ Farads 1 VOUT 1* I R CL LOAD Ȣ POST OFFICE BOX 655303 (3) • DALLAS, TEXAS 75265 


 


     
    
      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION dropout performance Referring to the Block Diagram, the dropout voltage of the UCC383 is equal to the minimum voltage drop (VIN to VOUT) across the N-channel MOSFET. The dropout voltage is dependent on operating conditions such as load current, input and load voltages, as well as temperature. The UCC383 achieves a low Rds(on) through the use of an internal charge-pump (VPUMP) that drives the MOSFET gate. Figure 2 depicts typical dropout voltages versus load current for the 3.3-V and 5-V versions of the part, as well as the adjustable version programmed to 3.0 V. Figure 3 depicts the typical dropout performance of the adjustable version with various output voltages and load currents. Operating temperatures also affect the Rds(on) and dropout voltage of the UCC383. Figure 4 graphs the typical dropout for the 3.3-V and 5-V versions with a 3-A load over temperature. TYPICAL DROPOUT VOLTAGE vs. LOAD CURRENT 0.5 TYPICAL DROPOUT VOLTAGE vs. IOUT AND VOUT 0.8 VOUT = 3.3 V 0.7 0.6 VIN−VOUT (V) VIN−VOUT (V) 0.4 VOUT = 3 V 0.3 VOUT = 5 V 0.2 0.5 I OUT= 3 A 0.4 I OUT= 1.5 A 0.3 0.2 0.1 0.1 0 I OUT= 1 A 0 1 1.5 2 2.5 3 IOUT (A) 3 3.5 4 VOUT (V) 4.5 5 Figure 3 Figure 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 


 


     
    
      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION voltage programming and shutdown feature for adjustable version A typical application circuit based on the UCC383 adjustable version is shown in Figure 5. The output voltage is externally programmed through a resistive divider at the ADJ pin. TYPICAL DROPOUT VOLTAGE vs. CASE TEMPERATURE WITH A 3-A LOAD VIN − VOUT (V) 0.6 0.5 V OUT = 3.3 V 0.4 V OUT = 5 V 0.3 0.2 −40 10 60 Temperature (5C) Figure 4 V OUT + 1.25 ǒ1 ) R2 Ǔ Volts R1 (4) The maximum programmed output voltage is constrained by the 9-V absolute rating of the IC (this includes the charge pump voltage) and its ability to enhance the N-channel MOSFET. Unless the load current is below the 3-A rating of the device, output voltages above 7 V are not recommended. The minimum output voltage can be programmed down to 1.25 V. However, the input voltage must always be greater than the UVLO of the part. The adjustable version includes a shutdown feature, limiting quiescent current to 40 µA typical. The UCC383 is shut down by pulling the CT pin to below 0.25 V. As shown in Figure 5, a small logic level MOSFET or BJT transistor in parallel with the timing capacitor can be driven with a digital signal, putting the device in shutdown. If the CT pin is not pulled low, the IC internally pulls up the pin enabling the regulator. The CT pin should not be forced high, as this interferes with the short-circuit-protection feature. Selection of the timing capacitor is explained in Short-Circuit-Protection. The adjustable version can be used in applications requiring remote voltage sensing (i.e. monitoring a voltage other than or not directly tied to the VOUT pin). This is possible since the inverting input of the error-voltage amplifier (see Block Diagram) is brought out to the ADJ pin. 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 


 


     
    
      SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION thermal design The Package Information section of the Power Supply Control Products Data Book, Volume 3 (Literature No. SLUD003) contains reference material for the thermal ratings of various packages. The section also includes an excellent article Thermal Characteristics of Surface Mount Packages, that is the basis of the following discussion. Thermal design for the UCC383 family of linear regulators includes two modes of operation, normal and pulsed mode. In normal operation, the linear regulator and heat sink must dissipate power equal to the maximum forward voltage drop multiplied by the maximum load current. Assuming a constant current load, the expected heat rise at the regulator’s junction can be calculated as follows: t (q) + P RISE DISS ǒqjc ) qcaǓ °C (5) Where theta, (θ) is thermal resistance and PDISS is the power dissipated. The thermal resistance of both the TO−220 and TO−263 packages (junction to case) is 3°C per Watt. In order to prevent the regulator from going into thermal shutdown, the case to ambient theta must keep the junction temperature below 150°C. If the LDO is mounted on a 5-square inch pad of 1-ounce copper, for example, the thermal resistance from junction to ambient becomes 60°C per Watt. If a lower thermal resistance is required by the application, the device heat sinking would need to be improved. When the UCC383 regulator is in pulsed mode due to an overload or short-circuit in the application, the maximum average power dissipation is calculated as follows: P PULSE(avg) ǒ + V IN *V OUT Ǔ t I CL 33 ON Watts t ON (6) As seen in Equation 6, the average power during a fault is reduced dramatically by the duty cycle, allowing the heat sink to be sized for normal operation. Although the peak power in the regulator during the tON period can be significant, the thermal mass of the package generally keeps the junction temperature from rising unless the tON period is increased to tens of milliseconds. ripple rejection Even though the UCC383 family of linear regulators are not optimized for fast transient applications (Refer to the UC182 Fast LDO Linear Regulator), they do offer significant power supply rejection at lower frequencies. Figure 6 depicts ripple rejection performance in a typical application. The performance can be improved with additional filtering. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 


 


     
    
     SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION UCC383−ADJ 1 VINPUT VIN VOUT 5 10µF 10µF RLOAD R2 2 CT SHUTDOWN ADJ GND 4 R1 3 Figure 5. Typical Application for 5-Pin Adjustable Version Figure 6. Ripple Rejection vs. Frequency 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  PACKAGE OPTION ADDENDUM www.ti.com 14-Oct-2022 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) (3) Device Marking Samples (4/5) (6) UCC283T-ADJ ACTIVE TO-220 KC 5 50 RoHS & Green SN N / A for Pkg Type UCC283T-ADJ Samples UCC283TDKTTT-5 ACTIVE DDPAK/ TO-263 KTT 3 50 RoHS & Green SN Level-2-260C-1 YEAR UCC283TD-5 Samples UCC283TDTR-3 ACTIVE DDPAK/ TO-263 KTT 3 500 RoHS & Green SN Level-2-260C-1 YEAR UCC283TD-3 Samples UCC283TDTR-ADJ ACTIVE DDPAK/ TO-263 KTT 5 500 RoHS & Green SN Level-2-260C-1 YEAR UCC283TD-ADJ Samples UCC383T-ADJ ACTIVE TO-220 KC 5 50 RoHS & Green SN N / A for Pkg Type UCC383T-ADJ Samples UCC383TDKTTT-5 ACTIVE DDPAK/ TO-263 KTT 3 50 RoHS & Green SN Level-2-260C-1 YEAR UCC383TD-5 Samples UCC383TDTR-3 ACTIVE DDPAK/ TO-263 KTT 3 500 RoHS & Green SN Level-2-260C-1 YEAR UCC383TD-3 Samples UCC383TDTR-ADJ ACTIVE DDPAK/ TO-263 KTT 5 500 RoHS & Green SN Level-2-260C-1 YEAR UCC383TD-ADJ Samples -40 to 85 -40 to 85 0 to 70 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of