TS39300

TS39300 3A Ultra Low Dropout Positive Voltage Regulator TO-263 Pin Assignment: 1. Input 2. Gr ound 3. O utput Low Dropout Voltage 0.4V (typ.) Output Current 3A Low Ground Current General Description The TS39300 series are 3A ultra low dropout linear voltage regulators that provide low voltage, high curren t output with a min imum o f exte rnal components. The TS39300 offe rs extremely low d ropout (typically 400mV at 3A) and low ground current (typically 36mA at 3A). The TS39300 is ideal fo r PC add-in cards that need to c onvert from standard 3 .3V to 2.5V o r 2.5V to 1 .8V. A guaranteed maximum dropout voltage of 500mV over all o perating conditions allows the TS39300 to provide 2.5V from a supply as low as 3V, and 1.8V from a supply as low as 2.5V. The TS39300 also has fast transient response for heavy switching applications. The device requires only 47uF of output capacitor to maintain stability and achieve fast transient response. Features        Dropout voltage typically 0.4V @Io=3A Output current up to 3A Low ground current Current lim iting and Thermal shutdown Extremely fast transient response Reversed leakage protection Reverse battery pro tection Ordering Information Part No. T S3 9 3 0 0 CZ x x T S 3 9 3 0 0 C Mx x Operat ing Temp. -40 ~ +125 C o Package TO-220 TO-263 Note: Whe re xx denotes voltage option, available are 50 = 5.0V 33 = 3.3V 25 = 2.5V 18 = 1.8V Applications    Battery power equipment LDO linear regulato r fo r PC add-in cards PowerPC TM    High efficiency linear power supplies High efficiency post regulato r fo r switching supply Low-voltage microcontrollers and digita l logic SMPS post regula tor power supplies  Multimedia and PC p rocessor supplies  Absolute Maximum Rating (Note 1) Supply Voltage Enable Voltage Storage Temperatu re Range Lead Soldering Temperature (260 C) ESD o Vin Ve n TSTG -20V ~ +20 +20 -65 ~ +150 5 (Note 3) V V o C S TS39300 1 -6 2005/12 rev. A Operating Rating (Note 2) Operation Input Voltage Operation Enable Voltage Power Dissipation (Note 4) Operating Junction Tempera ture Range Vin (operate ) Ven (operate) PD TJ +2.5 ~ +16 +16 Internally Limited -40 ~ +125 V V W o C Electrical Characteristics Vin = Vout + 1V, Venable= 2 .4V, T j = 25 C, unless otherwise specified. o Parameter Output Voltage Output Voltage Line Regulation Load Regulation Output Voltage Temp. Coefficient Conditions IL=10mA 10mA ≤ IL ≤ 3A, Vo+1V ≤ Vin ≤ 16V IL=10mA, Vo+1V ≤Vin≤ 16V Vin=Vout+1V, 10mA≤IL≤3A Note 5 IL=100mA Min 0.990|Vo| 0.980|Vo| ------------- Typ 5.0/3.3 2.5/1.8 0.06 0.2 40 65 185 250 400 6 10 17 45 4.5 Max 1.010|Vo| 1.020|Vo| 0.5 1.0 100 200 --550 10 20 ---- Unit V % % p p m/ C o Dropout Voltage (Note 6 & 8 ) ΔVout= -1% IL=750mA IL=1.5A IL=3A IL=100mA mV Quiescent Current (No te 7) Vin=Vout+1V IL=750mA IL=1.5A IL=3A mA Current L imited Vout=0, Vin=Vout+1V A Thermal Performance Condition Thermal Resistance Junction to Case Note: Package type TO-220 TO-263 Typ 2 2 Unit o C/W 1. Exceeding the absolute maximum ra tings may damage the device. 2. The device is not guaranteed to function outside its opera ting rating. 3. Devices are ESD sensitive. Handling precautions recomme nded. 4. Pd(max) = (Tj(max) - Ta) + Өja, where Өja depends upon the printed circuit layout. See ”Applications Info rmation”. 5. Output voltage tempera ture coefficient is ΔVout (w orst case) + (Tj(max) – Tj(min)) where Tj(max) is +125 C and Tj(min) o is -40 C. 6. Vdrop = V in - Vout when Vout decreases to 99% of its nominal output voltage with Vin =Vout – Vin + 1. For output voltages below 2.5V, dropout voltage is the input-to-outpu t v oltage differential w ith the minimu m input voltage being 2.5V. M inimum input opera ting voltage is 2.5V 7. Ignd is the quiescent current. Iin = Ignd + Iout 8. For 2 .5V device, Vin = 2.25V (device is in dropout) o TS39300 2 -6 2005/12 rev. A Typical Application Circuit Block Diagram TS39300 3 -6 2005/12 rev. A Application Information Application Information The TS39300 is a high perfo rmance low d ropout voltage regulator suitable for moderate to high-current voltage regulator applications. Its 500mV dropout voltage a t full load makes it especially valuable in battery-powered systems and a h igh-efficiency noise filter in post-regulator applications. Un like olde r NPN -pass transistor designs, where the minimum d ropout voltage is lim ited by the base-to -emitter voltage drop and collector-to-emitter satu ration voltage, dropout performance of PNP output o f these devices is limited only by the low V CE saturation voltage. A trade-off fo r the low dropout voltage is a varying base drive requirement. The TS39300 regulator is fully protected from damage due to fault conditions. Current lim iting is provided. This limiting is linea r, ou tput current du ring overload conditions is constant. Thermal shutdown disables the device when the die temperature exceeds the mzximum safe operating tempera ture. Transient proection allows device (and load) survival even when the input voltage spikes above and below nominal. The output structure of these regulators allows voltages in excess of the desired output voltage to be applied without reverse current flow. and provides good transient response and stability over temperature . Aluminum electroly tics can also be used, as long as the ESR o f the capacitor is ≤1 Ω. The value of the output capacitor can be increased without lim it. H igher capacitance values help to improve transient response and ripple rejection and reduce output noise. Input Capacitor Requirement An input capacitor of 1uF or greate r is recommended when the device is more than 4 inches away from the bulk as supply capacitance, or when the supply is a battery. Small, surface-mount, ceram ic chip capacitors can be is used for the bypassing. Large r values w ill help to imp rove ripple rejection by bypassing the input to the regulato r, fu rther improving the integrity o f the output voltage.. Minimum Load Current The TS39300 regulator is specified between finite loads. If the output current is too small, leakage dominate and the output voltage rises. A 10mA minimum regulator. load current is necessary for proper Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion The TS39300 has excellent transient response to variationis in input voltage and load curren t. The device has been designed to respond quickly to load current variations and input voltage variations. Large output capacitors are not required to obtain this performance. A standard 47uF output capacitor, pre ferably tanta lum, is all that is required. Larger values help to improve performance even further. By virtue o f its low -dropout voltage, th is device does not saturate into dropout as readily as sim ilar NPN-based designs. When converting from 3.3V to 2.5V or 2 .5V to 1.8V, the NPN-base regulators a re already operating in dropout, w ith typical dropout require ments of 1.2V or greater. To convert down to 2.5V without operating in dropout, NPN-based regulato rs require an input voltage of 3.7V a t the ve ry least. The TS39300 regulator will p rovide excellent performance w ith an input as low as 3.0V or 2.5V . This gives the PNP-based regulators a distinct advantage over older, NPN-base linear regulators. Output Capacitor Requirement The TS39300 requires an output capacitor to maintain stability and improve transient reponse. Proper capacitor selection is importan t to ensure proper operation. The TS39300 output capacitor selection is dependent upon the ES R (equivalent series resistance) of the output capacitor to ma intain stability. When the output capacitor is 47uF or greater, the output capacitor should have less than 1Ω of ESR. This will imp rove transient response as well as promote instability. The very low ESR levels may cause an oscillation and/or underdamped transient response. A low-ESR solid tantalum capacitor works extremely well TS39300 4 -6 2005/12 rev. A Application Information (continues) Thermal Design Linear regulators a re simple to use. The most complicated design parameters to consider are thermal characteristics. Thermal design requires four application-specific parameters: Maximum ambient tempe rature (Ta) Output Current (Iout) Output Voltage (Vout) Input Voltage (Vin ) Ground Curren t (Ignd) Calculate the power dissipation o f the regulato r from these numbers and the device paramete rs from this datasheet, where the ground current is taken fro m data sheet. Pd = (Vin – Vout) x Iout + Vin x Ignd The heat sink therma l resis tance is determ ined by: Өsa = (Tj(max) – Ta) / Pd – (Өjc + Өcs) Where Tj(max) ≤ 125 C and Өcs is between 0 C and o 2 C/W. The heat sink may by significantly reduced in applications where the m inimum input voltage is know and is la rge compared w ith the d ropout voltage and distribute the heat between this resisto r and the regulator. The low dropout p roperties of vertical PNP regulators allow significant reductions in regulator power dissipation and the associated heat sink w ithout compromising perfo rmance. When this technique is employed, a capacito r o f a t least 1 .0uF is needed directly between the input and regulato r ground. o o TS39300 5 -6 2005/12 rev. A TO-220 Mechanical Drawing A B A C B C K L K L DIM A B C D MIN TO-220 DIMENS ION MILLIMETERS MA X 10.500 4.440 2.940 6.350 1.106 2.715 5.430 14.732 9.017 16.510 4.826 1.397 29.620 2.921 0.610 6.858 10.000 3.240 2.440 0.381 2.345 4.690 12.700 8.382 14.224 3.556 0.508 27.700 2.032 0.255 5.842 INCHES MIN 0.394 0.128 0.096 0.015 0.092 0.092 0.500 0.330 0.560 0.140 0.020 1.060 0.080 0.010 0.230 MA X 0.413 0.175 0.116 0.250 0.040 0.058 0.107 0.581 0.355 0.650 0.190 0.055 1.230 0.115 0.024 0.270 P J I P J I M D E F GM H I J K L M N D F G TS39300 H A D H E F G E O N O N O P TO-263 Mechanical Drawing E A I H B B I H F E F DIM A B C D E F G H I J MIN TO-263 DIMENS ION MILLIMETERS MA X 10.500 15.875 0.991 2.660 4.830 1.400 0.730 8.800 1.400 1.520 10.000 14.605 0.508 2.420 4.064 1.118 0.450 8.280 1.140 1.480 INCHES MIN 0.394 0.575 0.020 0.095 0.160 0.045 0.018 0.325 0.044 0.058 MA X 0.413 0.625 0.039 0.105 0.190 0.055 0.029 0.346 0.055 0.060 G C D G C 6 -6 2005/12 rev. A