UC282TDTR-3





 



        
  SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 D D D D D D D D Fast Transient Response 10-mA to 3-A Load Current Short Circuit Protection Maximum Dropout of 450-mV at 3-A Load Current Separate Bias and VIN Pins Available in Adjustable or Fixed-Output Voltages 5-Pin Package Allows Kelvin Sensing of Load Voltage Reverse Current Protection 5-PIN TO-220 T PACKAGE (TOP VIEW) 5-PIN TO-263 TD PACKAGE (TOP VIEW) Note: Tab = Ground description The UC382 is a low-dropout-linear regulator providing a quick response to fast load changes. Combined with its precision onboard reference, the UC382 excels at driving GTL and BTL buses. Due to its fast response to load transients, the total capacitance required to decouple the regulator’s output can be significantly decreased when compared to standard LDO linear regulators. Dropout voltage (VIN to VOUT) is only 450 mV maximum at 100°C and 350 mV typical at 3-A load. The onboard bandgap reference is stable with temperature and scaled for a 1.2-V input to the internal-power amplifier. The UC382 is available in fixed-output voltages of 1.5 V, 2.1 V, or 2.5 V. The output voltage of the adjustable version can be set with two external resistors. If the external resistors are omitted, the output voltage defaults to 1.2 V. block diagram VB 1 UC382−ADJ UC382−1 (1.5 V) UC382−2 (2.1 V) UC382−3 (2.5 V) R1 R2 OPEN 2k 2k 2k 0 500 Ω 1.5 k Ω 2.16 k Ω THERMAL SHUTDOWN 2 1.2 V BANDGAP REFERENCE VIN + R2 R1 SHORT CIRCUIT SENSE 3 5 4 GND ADJ VOUT UDG-00080 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  2000−2004, Texas Instruments Incorporated 
   ! "#$ !  %#&'" ($) (#"! "  !%$""! %$ *$ $!  $+! !#$! !(( ,-) (#" %"$!!. ($!  $"$!!'- "'#($ $!.  '' %$$!) POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 



 



        
   SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 absolute maximum ratings over operating free-air temperature (unless otherwise noted)†} VB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 V VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5 V Output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 V to 6.0 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. } Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages. AVAILABLE OPTIONS(1) PACKAGED DEVICES TO−263 (TD)(2) TO-220 (T) TJ OUTPUT VOLTAGE OUTPUT VOLTAGE 1.5 V 2.1 V 2.5 V 1.2 V or ADJ 1.5 V 2.1 V 2.5 V 1.2 V or ADJ –40°C to 100°C 282T-1 282T-2 282T-3 282T-ADJ 282TD-1 282TD-2 282TD-3 282TD-ADJ 0°C to 100°C 382T-1 382T-2 382T-3 382T-ADJ 382TD-1 382TD-2 382TD-3 382TD-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., UC282TDKTTT−1); for 500 piece reel, add TR (e.g., UC282TDTR−1). electrical characteristics, TA = −40°C to 100°C for the UC282-X series and 0°C to 100°C for the UC382-X, VB = 5 V, VIN = 3.3 V, VOUT = 2.5 V for the UC382-ADJ, TA = TJ, (unless otherwise stated) UC382-3 fixed 2.5 V, 3-A family PARAMETERS MIN TYP MAX UNITS UC382-3 TEST CONDITIONS 2.475 2.500 2.525 V Output voltage (IVOUT = 100 mA) UC282-3 2.450 2.500 2.525 V Load regulation IVOUT = 10 mA to 3 A 0.5 4 80 100 VIN PSSR VB PSSR VIN dropout voltage = VIN−VOUT VB dropout = VB−VOUT 50 dB 60 dB IVOUT = 3 A, IVOUT = 3 A, TJ = 25°C UC382-3 350 425 mV 350 450 mV IVOUT = 3 A, IVOUT = 3 A, UC282-3 350 500 mV UC382-3 1.8 2.10 V IVOUT = 3 A, UC282-3 1.8 2.20 V Short circuit current limit 3.3 VB current IVOUT = 10 mA IVOUT = 3 A VIN current IVOUT = 3 A 2 mV POST OFFICE BOX 655303 2.94 • DALLAS, TEXAS 75265 4.5 A 6 11 mA 18 60 mA 2.97 A 



 



        
  SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 electrical characteristics, TA = −40°C to 100°C for the UC282-X series and 0°C to 100°C for the UC382-X, VB = 5 V, VIN = 3.3 V, VOUT = 2.5 V for the UC382-ADJ, TA = TJ, (unless otherwise stated) UC382-2 fixed 2.1 V, 3-A family PARAMETERS MIN TYP MAX UNITS UC382-2 TEST CONDITIONS 2.079 2.100 2.121 V Output voltage (IVOUT = 100 mA) UC282-2 2.058 2.100 2.121 V Load regulation IVOUT = 10 mA to 3 A 0.5 4 80 100 VIN PSSR VB PSSR 52 VIN dropout voltage = VIN−VOUT VB dropout = VB−VOUT mV dB 62 dB IVOUT = 3 A, IVOUT = 3 A, TJ = 25°C UC382-2 350 425 mV 350 450 mV IVOUT = 3 A, IVOUT = 3 A, UC282-2 350 500 mV UC382-2 1.8 2.10 V IVOUT = 3 A, UC282-2 1.8 2.20 V Short circuit current limit 3.3 VB current IVOUT = 10 mA IVOUT = 3 A VIN current IVOUT = 3 A 2.94 4.5 A 6 11 mA 18 60 mA 2.97 A UC382-1 fixed 1.5 V, 3-A family PARAMETERS MIN TYP MAX UNITS UC382-1 TEST CONDITIONS 1.485 1.500 1.515 V Output voltage (IVOUT = 100 mA) UC282-1 1.470 1.500 1.515 Load regulation IVOUT = 10 mA to 3 A 0.5 4 VIN PSSR 80 VB PSSR VIN dropout voltage = VIN−VOUT VB dropout = VB−VOUT 55 100 V mV dB 65 dB IVOUT = 3 A, IVOUT = 3 A, TJ = 25°C UC382-1 350 425 mV 350 450 mV IVOUT = 3 A, IVOUT = 3 A, UC282-1 350 500 mV UC382-1 1.8 2.10 V IVOUT = 3 A, UC282-1 1.8 2.20 V Short circuit current limit 3.3 VB current IVOUT = 10 mA IVOUT = 3 A VIN current IVOUT = 3 A POST OFFICE BOX 655303 2.94 • DALLAS, TEXAS 75265 4.5 A 6 11 mA 18 60 mA 2.97 A 3 



 



        
   SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 electrical characteristics, TA = −40°C to 100°C for the UC282-X series and 0°C to 100°C for the UC382-X, VB = 5 V, VIN = 3.3 V, VOUT = 2.5 V for the UC382-ADJ, TA = TJ, (unless otherwise stated) UC382-ADJ adjustable, 3-A family PARAMETERS ADJ voltage (IVOUT = 100 mA) Load regulation MIN TYP MAX UNITS UC382-ADJ TEST CONDITIONS 1.188 1.200 1.212 V UC282-ADJ 1.176 1.200 1.212 V 0.5 4 80 100 VIN PSSR IVOUT = 10 mA to 3 A VOUT programmed for 2.5 V VB PSSR VOUT programmed for 2.5 V TJ = 25°C UC382-ADJ 350 425 mV VIN dropout voltage = VIN−VOUT IVOUT = 3 A, IVOUT = 3 A, 350 450 mV IVOUT = 3 A, IVOUT = 3 A, UC282-ADJ 350 500 mV UC382-ADJ 1.8 2.10 V IVOUT = 3 A, UC282-ADJ 1.8 2.20 V VB dropout = VB−VOUT 50 Short circuit current limit VB current VIN current IVOUT = 3 A 2.94 dB 60 3.3 IVOUT = 10 mA IVOUT = 3 A mV dB 4.5 A 6 11 mA 18 60 mA 2.97 A pin descriptions ADJ: In the adjustable version, the user programs the output voltage with two external resistors. The resistors should be 0.1% for high accuracy. The output amplifier is configured as a non-inverting-operational amplifier. The resistors should meet the criteria of R3 || R4 < 100 Ω. Connect ADJ to VOUT for an output voltage of 1.2 V. Note that the point at which the feedback network is connected to the output is the Kelvin sense point. For -1, -2, and -3 versions, ADJ pin is tied to VOUT to obtain specified output voltage. GND: For accurate results, the GND pin should be referenced to the load ground. VB: Supplies power to all circuits of the regulator except the collector of the output-power transistor. The 2-V headroom from VB to VOUT allows the use of a Darlington output stage for inherently-low-output impedance and fast response. (Dropout is derated for junction temperatures below 0°C.) VIN: Supplies the current to the collector of the output-power transistor only. The dropout (VIN−VOUT) is under 100 mV for light loads; maximum dropout is 450 mV at 3 A for TJ = 0°C to 100°C. (Dropout is derated for junction temperatures over 100°C.) At full load, the majority of the VB current is going to the load. VOUT: This pin should be connected to the load via a low impedance path. Avoid connectors which add significant inductance and resistance. Note that even though a Kelvin sense is available through a 5-pin package, care must be taken since voltage drops along wire traces add to the dropout voltage. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 



 



        
   SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 pin descriptions (continued) DROPOUT VOLTAGE (VB − VOUT) vs LOAD CURRENT DROPOUT VOLTAGE (VIN − VOUT) vs LOAD CURRENT 1.9 400 VDO - Dropout Voltage - mV VDO - Dropout Voltage - V TJ = 275C 1.8 1.7 1.6 0 1 2 3 TJ = 275C 300 200 100 100 mA IL − Load Current − A 1A 2A 3A IL - Load Current - A Figure 1 Figure 2 APPLICATION INFORMATION The UC382 is easy to use. The adjustable version requires two 0.1% resistors to set the output voltage. The fixed versions of the UC382 require no external resistors. All versions of the UC382 require decoupling capacitors on the input and output. In a typical application, VB and VIN are driven from switching power supplies which may have large filter capacitors at their outputs. If the UC382 is further than 12 inches from the power supply, it is recommended to add local decoupling as close as possible to the linear regulator. Decouple the output of the UC382 with at least 100 µF of high-quality tantalum or Sanyo OSCON capacitors close to the VOUT pin for maximum stability. Many applications involving Ultra-Fast GTL or BTL applications require additional capacitance close to the load. The exact amount will vary according to speed and magnitude of the load transients and the tolerance allowed for transients on VOUT. When specifying the decoupling capacitors, the series resistance of the capacitor bank is an important factor in its ability to filter load transients. The UC382 allows for Kelvin sensing the voltage at the load. This improves regulation performance and eliminates the voltage drops due to wire-trace resistance. This voltage drop must be added to the headroom (VIN to VOUT and VB to VOUT). The dropout of 450 mV is measured at the pins and does not include additional drops due to trace resistance. The minimum load current is 10 mA. Two or more UC382’s may be used in parallel. While stable, this arrangement does degrade the transient response. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 



 



        
   SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 OPEN LOOP PHASE vs FREQUENCY OPEN LOOP GAIN vs FREQUENCY 0 70 60 40 Phase - deg Gain - dB 50 30 −90 20 10 0 −180 −10 100 1k 10 k 100 k 1M 10 M 100 1k 10 k f − Frequency − Hz f − Frequency − Hz PSRR - Power Supply Rejection Ratio (VB INPUT) − dB Figure 3 Figure 4 POWER SUPPLY REJECTION RATIO (VB INPUT) vs FREQUENCY 60 50 40 30 20 10 0 100 1k 10 k 100 k 1M f − Frequency − Hz Figure 5 6 100 k POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 10 M 1M 10 M 



 



        
   SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 APPLICATION INFORMATION 5V 1 µF CER 1 3.3 V 2 + VIN 4.7 µF TANT VB VOUT 4 + 100 µF TANT UC382−ADJ GND ADJ IRF 520 VO = 1.2 V 121 Ω R1 PULSE GENERATOR 5 3 UDG-00081 Figure 6. Transient Test Circuit 10 mA to 3 A/ms Load Transient Response ∆ µ Figure 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 



 



        
   SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 APPLICATION INFORMATION +5 V + 4.7 µF CER KELVIN SENSE POINT 1 +3.3 V 2 VB VIN + 4.7 µF VOUT R3 60 Ω UC382−ADJ TANT GND ADJ +1.8 V OUTPUT 4 5 + 330 µF OSCON 2.2 µF CER R4 120 Ω 3 UDG-00082 Figure 8. Typical UC382-ADJ Application +5 V + 4.7 µF KELVIN SENSE POINT 1 2 VIN VB VOUT + 330 µF OSCON UC382−1 GND ADJ +1.5 V OUTPUT 4 2.2 µF CER 5 3 UDG-00083 Figure 9. Typical UC382-1, -2, or -3 Application 8 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) Device Marking (3) Samples (4/5) (6) UC282T-ADJ ACTIVE TO-220 KC 5 50 RoHS & Green SN N / A for Pkg Type -40 to 100 UC282T-ADJ Samples UC282TDKTTT-1 ACTIVE DDPAK/ TO-263 KTT 5 50 RoHS & Green SN Level-2-260C-1 YEAR -40 to 100 UC282TD-1 Samples UC282TDTR-3 ACTIVE DDPAK/ TO-263 KTT 5 500 RoHS & Green SN Level-2-260C-1 YEAR -40 to 100 UC282TD-3 Samples UC282TDTR-ADJ ACTIVE DDPAK/ TO-263 KTT 5 500 RoHS & Green SN Level-2-260C-1 YEAR -40 to 100 UC282TD-ADJ Samples UC382T-ADJ ACTIVE TO-220 KC 5 50 RoHS & Green SN N / A for Pkg Type UC382T-ADJ Samples UC382T-ADJG3 ACTIVE TO-220 KC 5 50 RoHS & Green SN N / A for Pkg Type 0 to 100 UC382T-ADJ Samples UC382TDKTTT-2 ACTIVE DDPAK/ TO-263 KTT 5 50 RoHS & Green SN Level-2-260C-1 YEAR 0 to 70 UC382TD-2 Samples UC382TDTR-ADJ ACTIVE DDPAK/ TO-263 KTT 5 500 RoHS & Green SN Level-2-260C-1 YEAR UC382TD-ADJ Samples (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