UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 D Controlled Baseline D D D D D D D D D D D – One Assembly/Test Site, One Fabrication Site Extended Temperature Performance of –40°C to 105°C Enhanced Diminishing Manufacturing Sources (DMS) Support Enhanced Product Change Notification Qualification Pedigree† Precision 1% Reference Over-Current Sense Threshold Accurate to 5% Programmable Duty-Ratio Over-Current Protection D D D D 4.5 V to 36 V Operation 100 mA Output Drive, Source or Sink Under-Voltage Lockout Adjustable Current Limit to Current Sense Ratio Separate +VIN terminal Programmable Driver Current Limit Access to VREF and E/A(+) Logic-Level Disable Input DW PACKAGE (TOP VIEW) +VIN Comp/Shutdown E/A(+) +2V REF GND Logic Disable Limit Source † Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits. 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 Current Sense(+) Current Sense(–) Timer RC NC VADJ NC Sink E/A(–) NC = No Connect description The UC2832 series of precision linear regulators include all the control functions required in the design of very low dropout linear regulators. Additionally, they feature an innovative duty-ratio current limiting technique which provides peak load capability while limiting the average power dissipation of the external pass transistor during fault conditions. When the load current reaches an accurately programmed threshold, a gated-astable timer is enabled, which switches the regulator’s pass device off and on at an externally programmable duty-ratio. During the on-time of the pass element, the output current is limited to a value slightly higher than the trip threshold of the duty-ratio timer. The constant-current-limit is programmable on the UC2832 to allow higher peak current during the on-time of the pass device. With duty-ratio control, high initial load demands and short circuit protection may both be accommodated without extra heat sinking or foldback current limiting. Additionally, if the timer pin is grounded, the duty-ratio timer is disabled, and the IC operates in constant-voltage/constant-current regulating mode. These IC’s include a 2 Volt (±1%) reference, error amplifier, UVLO, and a high current driver that has both source and sink outputs, allowing the use of either NPN or PNP external pass transistors. Safe operation is assured by the inclusion of under-voltage lockout (UVLO) and thermal shutdown. ORDERING INFORMATION‡ –40°C to 105°C ORDERABLE PART NUMBER PACKAGE§ TA SOP – DW Tape and reel UC2832TDWREP TOP-SIDE MARKING UC2832TEP –40°C to 105°C SOP – DW Tube UC2832TDWEP UC2832TEP ‡ Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 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. Copyright 2003, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 block diagram Ordering Information UC 283 2 T DW R EP ENHANCED PLASTIC INDICATOR TAPE and REEL INDICATOR PACKAGE DW = Plastic SOIC TEMPERATURE INDICATOR T = –40_C to 105_C PRODUCT OPTION 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†‡ VIN supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V Driver output current (sink or source), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mA Driver sink to source voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V TRC pin voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 3.2 V Other input voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to supply voltage Operating jucntion temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55_C to 150_C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65_C to 150_C Lead temperature soldering 1,6 mm (1/16 inch) from case for 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. ‡ Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals. electrical characteristics, TA = –40_C to 105_C for the UC2832T-EP, +VIN = 15 V, Driver sink = +VIN, C/S(+) voltage = +VIN, and TA = TJ (unless otherwise stated) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input Supply Supply Su ly current +VIN = 6 V 6.5 10 +VIN = 36 V 9.5 15 Logic Disable = 2 V 3.3 10 mA Reference Section Output voltage IDRIVER = 10 mA Load regulation voltage IOUT = 0 to 10 mA Line regulation +VIN = 4.5 V to 36 V, TJ = 25_C 1.98 2 2.02 TJ = Full range 1.96 2 2.04 –10 –5 10 mV 0.033 0.5 mV/V 3.6 4.5 V V IDRIVER = 10 mA Under-voltage lockout threshold Logic Disable Input Threshold voltage 1.3 1.4 1.5 V Logic Disable = 0 V –5 –1 0.1 µA TJ = 25_C 95 100 105 TJ = Full range 93 100 107 VADJ = Open 110 135 170 VADJ = 1 V 180 235 290 VADJ = 0 V 250 305 360 Input bias current VCM = +VIN 65 100 135 µA Input offset current VCM = +VIN –10 10 µA Amplifier CMRR VCM = 4.1 V to +VIN + 0.3 V 80 dB Transconductance ICOMP = "100 µA 65 ms VADJ input current VADJ = 0 V –1 µA Input bias current Current Sense Section Comparator offset Amplifier Am lifier offset POST OFFICE BOX 655303 mV –10 • DALLAS, TEXAS 75265 mV 3 UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 electrical characteristics, TA = –40_C to 105_C for the UC2832T-EP, +VIN = 15 V, Driver sink = +VIN, C/S(+) voltage = +VIN, and TA = TJ (unless otherwise stated) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Timer Inactive leakage current C/S(+) = C/S(–) = +VIN, TRC pin = 2 V Active pull-up current C/S(+) = +VIN, TRC pin = 0 V C/S(–) = +VIN – 0.4 V, Duty ratio (See Note 1) ontime/period, RT = 200 kΩ, CT = 0.27 µF Period (See Notes 1 and 2) ontime + offtime, RT = 200 kΩ, CT = 0.27 µF –345 0.25 1 µA –270 –175 µA 4.8 % 36 ms Upper trip threshold (Vu) 1.8 V Lower trip threshold (Vl) 0.9 V 2.0 V/V Trip threshold ratio Vu / Vl Error Amplifier Section Input offset voltage VCM = VCOMP = 2 V –8 Input bias current VCM = VCOMP = 2 V –4.5 Input offset current VCM = VCOMP = 2 V –1.5 Open loop voltage gain (AVOL) VCOMP = 1 V to 13 V 50 70 dB Common mode rejection ratio (CMRR) VCM = 0 V to +VIN – 3 V 60 80 dB PSRR VCM = 2 V, +VIN = 4.5 V to 36 V 90 dB Transconductance ICOMP = "10 µA High-level output voltage (VOH) ICOMP = 0, Low-level output voltage (VOL) ICOMP = 0 Output high current (IOH) VCOMP = 2 V Output low current (IOL) VCOMP = 2 V 8 1.5 4.3 Volts below +VIN C/S(–) = +VIN mV µA –1.1 µA ms 0.95 1.3 V 4.5 0.7 V –700 –500 –100 µA 100 500 700 µA C/S(–) = +VIN – 0.4 V 2 6 mA NOTES: 1. These parameters are first-order supply-independent, however, both may vary with supply for +VIN less than about 4 V. This supply variation will cause a slight change in the timer period and duty cycle, although a high off-time/on-time ratio will be maintained. 2. With recommended RT value of 200 kΩ, TOFF ≈ RT CT * ln(Vu/Vl) "10%. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 electrical characteristics, TA = –40_C to 105_C for the UC2832T-EP, +VIN = 15 V, Driver sink = +VIN, C/S(+) voltage = +VIN, and TA = TJ (unless otherwise stated) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Driver Section Maximum current Driver limit and source pins common Limiting voltage Internal current sense resistance TJ = 25_C TJ = Full range 200 300 400 100 300 450 Driver limit to source voltage at current limit, ISOURCE = –10 mA, TJ = 25_C, See Note 3 TJ = 25_C, See Note 3 Driver sink = +VIN – 1 V Pull-up current at driver sink Compensation/Shutdown = 0.4 V Pull-down current at driver source Compensation/Shutdown = 0.4 V, Driver source = 1 V Saturation voltage sink to source Driver source = 0 V, Maximum source voltage Driver sink = +VIN, Driver current = 100 mA, Volts below +VIN UVLO sink leakage Maximum reverse source voltage +VIN = 36 V, Driver sink = 35 V 0.72 V Ω 2.4 –800 –300 –100 –1000 –300 –75 150 300 700 Driver current = 100 mA mA µA µA 1.5 V 3 V +VIN = C/S(+) = C/S(–) = 2.5 V, Driver sink = 15 V, Driver source = 0 V, TA = 25_C 25 µA Compensation/Shutdown = 0 V, ISOURCE = 100 µA, (+)VIN = 3 V 1.6 V 160 _C Thermal shutdown NOTES: 3. The internal current limiting voltage has a temperature dependence of approximately –2.0 mV/_C, or –2800 ppm/_C. The internal 2.4 Ω sense resistor has a temperature dependance of approximately +1500 ppm/_C. APPLICATION AND OPERATION INFORMATION Figure 1. NPN Pass (Medium Power, Low Drop-Out Regulator) POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 APPLICATION AND OPERATION INFORMATION Estimating Maximum Load Capacitance For any power supply, the rate at which the total output capacitance can be charged depends on the maximum output current available and on the nature of the load. For a constant-current current-limited power supply, the output will come up if the load asks for less than the maximum available short-circuit limit current. To ensure recovery of a duty-ratio current-limited power supply from a short-circuited load condition, there is a maximum total output capacitance which can be charged for a given unit ON time. The design value of ON time can be adjusted by changing the timing capacitor. Nominally, TON = 0.693 x 10 kΩ x CT. Typically, the IC regulates output current to a maximum of IMAX = K x ITH, where ITH is the timer trip-point current, and K+ Current Sense Amplifier Offset Voltage 100 mA and is variable from 1.35 to 3.05 with VADJ. For a worst-case constant-current load of value just less than ITH, CMAX can be estimated from: C ǒ ǒ Ǔ Ǔ T + K*1 MAX TH V ON OUT where VOUT is the nominal regulator output voltage. For a resistive load of value RL, the value of CMAX can be estimated from: C MAX T + ON R L ǒ ȱ Inȧ Ȳ 1 1* V K I Ǔ ȳȴȧ –1 OUT TH R L 320 300 Offset Voltage – mV 280 260 240 220 200 180 160 140 120 0 0.25 0.5 0.75 1 1.25 1.5 1.75 VADJ (Pin 11) – V 2 2.25 2.5 Figure 2. Current Sense Amplifier Offset Voltage vs VADJ 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 APPLICATION AND OPERATION INFORMATION NOTE A: VOS = 205 mV to 35 mV Figure 3. Timer Function Figure 4. Current Sense Input Configuration Figure 5. Load Current, Timing Capacitor Voltage, and Output Voltage of the Regulator Under Fault Conditions POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 APPLICATION AND OPERATION INFORMATION 8 Figure 6. UCx832 Error Amplifier Figure 7. UCx832 Current Sense Amplifier Figure 8. UCx832 Error Amplifier Figure 9. UCx832 Current Sense Amplifier POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 MECHANICAL DATA DW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 16 PINS SHOWN 0.020 (0,51) 0.014 (0,35) 9 0.050 (1,27) 16 0.010 (0,25) 0.419 (10,65) 0.400 (10,15) 0.010 (0,25) NOM 0.299 (7,59) 0.291 (7,39) Gage Plane 0.010 (0,25) 1 8 0°– 8° 0.050 (1,27) 0.016 (0,40) A Seating Plane 0.104 (2,65) MAX 0.012 (0,30) 0.004 (0,10) PINS ** 0.004 (0,10) 16 18 20 24 28 A MAX 0.410 (10,41) 0.462 (11,73) 0.510 (12,95) 0.610 (15,49) 0.710 (18,03) A MIN 0.400 (10,16) 0.453 (11,51) 0.500 (12,70) 0.600 (15,24) 0.700 (17,78) DIM 4040000/E 08/01 NOTES: B. C. D. E. All linear dimensions are in inches (millimeters). This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0.006 (0,15). Falls within JEDEC MS-013 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 MECHANICAL DATA MSOI003E – JANUARY 1995 – REVISED SEPTEMBER 2001 DW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 16 PINS SHOWN 0.020 (0,51) 0.014 (0,35) 9 0.050 (1,27) 16 0.010 (0,25) 0.419 (10,65) 0.400 (10,15) 0.010 (0,25) NOM 0.299 (7,59) 0.291 (7,39) Gage Plane 0.010 (0,25) 1 8 0°– 8° 0.050 (1,27) 0.016 (0,40) A Seating Plane 0.104 (2,65) MAX 0.012 (0,30) 0.004 (0,10) PINS ** 0.004 (0,10) 16 18 20 24 28 A MAX 0.410 (10,41) 0.462 (11,73) 0.510 (12,95) 0.610 (15,49) 0.710 (18,03) A MIN 0.400 (10,16) 0.453 (11,51) 0.500 (12,70) 0.600 (15,24) 0.700 (17,78) DIM 4040000/E 08/01 NOTES: A. B. C. D. All linear dimensions are in inches (millimeters). This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0.006 (0,15). Falls within JEDEC MS-013 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. 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