TS39300 3A Ultra Low Dropout Positive Voltage Regulator TO-263 Pin Assignment: 1. Input 2. Ground 3. Output 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 current output with a minimum of external components. The TS39300 offers extremely low dropout (typically 400mV at 3A) and low ground current (typically 36mA at 3A). The TS39300 is ideal for PC add-in cards that need to convert from standard 3.3V to 2.5V or 2.5V to 1.8V. A guaranteed maximum dropout voltage of 500mV over all operating 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 Ordering Information Dropout voltage typically 0.4V @Io=3A Output current up to 3A Low ground current Current limiting and Thermal shutdown Extremely fast transient response Reversed leakage protection Reverse battery protection Part No. TS39300CZxx TS39300CMxx Operating Temp. o -40 ~ +125 C Package TO-220 TO-263 Note: Where xx denotes voltage option, available are 50 = 5.0V 33 = 3.3V 25 = 2.5V 18 = 1.8V Applications Battery power equipment High efficiency linear power supplies LDO linear regulator for PC add-in cards High efficiency post regulator for switching supply TM PowerPC power supplies Low-voltage microcontrollers and digital logic Multimedia and PC processor supplies SMPS post regulator Absolute Maximum Rating (Note 1) Supply Voltage Vin -20V ~ +20 Enable Voltage Ven +20 Storage Temperature Range TSTG o Lead Soldering Temperature (260 C) 5 ESD TS39300 -65 ~ +150 (Note 3) 1-6 2005/12 rev. A V V o C S Operating Rating (Note 2) Operation Input Voltage Vin (operate) +2.5 ~ +16 V Operation Enable Voltage Ven (operate) +16 V Power Dissipation (Note 4) PD Internally Limited W Operating Junction Temperature Range TJ -40 ~ +125 o C Electrical Characteristics o Vin = Vout + 1V, Venable= 2.4V, Tj = 25 C, unless otherwise specified. Parameter Output Voltage Output Voltage Conditions IL=10mA Min 0.990|Vo| 10mA ≤ IL ≤ 3A, Vo+1V ≤ Vin ≤ 16V Typ 5.0/3.3 Max Unit 1.010|Vo| 0.980|Vo| 2.5/1.8 1.020|Vo| V Line Regulation IL=10mA, Vo+1V ≤Vin≤ 16V -- 0.06 0.5 % Load Regulation Vin=Vout+1V, 10mA≤IL≤3A -- 0.2 1.0 % Output Voltage Temp. Coefficient Note 5 -- 40 100 ppm/ C IL=100mA -- 65 200 IL=750mA -- 185 -- IL=1.5A -- 250 -- IL=3A -- 400 550 IL=100mA -- 6 10 IL=750mA -- 10 20 IL=1.5A -- 17 -- IL=3A -- 45 -- Vout=0, Vin=Vout+1V -- 4.5 -- Dropout Voltage (Note 6 & 8) Quiescent Current (Note 7) Current Limited ΔVout= -1% Vin=Vout+1V o mV mA A Thermal Performance Condition Package type Typ Thermal Resistance TO-220 2 Junction to Case Note: TO-263 2 Unit o C/W 1. Exceeding the absolute maximum ratings may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. 4. Pd(max) = (Tj(max) - Ta) + Өja, where Өja depends upon the printed circuit layout. See ”Applications Information”. o 5. Output voltage temperature coefficient is ΔVout (worst case) + (Tj(max) – Tj(min)) where Tj(max) is +125 C and Tj(min) o is -40 C. 6. Vdrop = Vin - 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-output voltage differential with the minimum input voltage being 2.5V. Minimum input operating 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) 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 performance low dropout voltage regulator suitable for moderate to high-current voltage regulator applications. Its 500mV dropout voltage at full load makes it especially valuable in battery-powered systems and a high-efficiency noise filter in post-regulator applications. Unlike older NPN-pass transistor designs, where the minimum dropout voltage is limited by the base-to-emitter voltage drop and collector-to-emitter saturation voltage, dropout performance of PNP output of these devices is limited only by the low V CE saturation voltage. A trade-off for the low dropout voltage is a varying base drive requirement. The TS39300 regulator is fully protected from damage due to fault conditions. Current limiting is provided. This limiting is linear, output current during overload conditions is constant. Thermal shutdown disables the device when the die temperature exceeds the mzximum safe operating temperature. 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 electrolytics can also be used, as long as the ESR of the capacitor is ≤1Ω. The value of the output capacitor can be increased without limit. Higher capacitance values help to improve transient response and ripple rejection and reduce output noise. Input Capacitor Requirement An input capacitor of 1uF or greater 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, ceramic chip capacitors can be is used for the bypassing. Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity of 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 load current is necessary for proper regulator. Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion Output Capacitor Requirement The TS39300 requires an output capacitor to maintain stability and improve transient reponse. Proper capacitor selection is important to ensure proper operation. The TS39300 output capacitor selection is dependent upon the ESR (equivalent series resistance) of the output capacitor to maintain stability. When the output capacitor is 47uF or greater, the output capacitor should have less than 1Ω of ESR. This will improve 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 The TS39300 has excellent transient response to variationis in input voltage and load current. 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, preferably tantalum, is all that is required. Larger values help to improve performance even further. By virtue of its low-dropout voltage, this device does not saturate into dropout as readily as similar NPN-based designs. When converting from 3.3V to 2.5V or 2.5V to 1.8V, the NPN-base regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater. To convert down to 2.5V without operating in dropout, NPN-based regulators require an input voltage of 3.7V at the very least. The TS39300 regulator will provide excellent performance with 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. 2005/12 rev. A Application Information (continues) Thermal Design Linear regulators are simple to use. The most complicated design parameters to consider are thermal characteristics. Thermal design requires four application-specific parameters: Maximum ambient temperature (Ta) Output Current (Iout) Output Voltage (Vout) Input Voltage (Vin) Ground Current (Ignd) Calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet, where the ground current is taken from data sheet. Pd = (Vin – Vout) x Iout + Vin x Ignd The heat sink thermal resistance is determined by: Өsa = (Tj(max) – Ta) / Pd – (Өjc + Өcs) o o 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 minimum input voltage is know and is large compared with the dropout voltage and distribute the heat between this resistor and the regulator. The low dropout properties of vertical PNP regulators allow significant reductions in regulator power dissipation and the associated heat sink without compromising performance. When this technique is employed, a capacitor of at least 1.0uF is needed directly between the input and regulator ground. TS39300 5-6 2005/12 rev. A TO-220 Mechanical Drawing K K B L L DIM C C AB A P P J J I I M D D E H E F G F G O O N N TO-220 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX A 10.000 10.500 0.394 0.413 B 3.240 4.440 0.128 0.175 C 2.440 2.940 0.096 0.116 D - 6.350 - 0.250 E 0.381 1.106 0.015 0.040 F 2.345 2.715 0.092 0.058 GM 4.690 5.430 0.092 0.107 H 12.700 14.732 0.500 0.581 I 8.382 9.017 0.330 0.355 J 14.224 16.510 0.560 0.650 K 3.556 4.826 0.140 0.190 L 0.508 1.397 0.020 0.055 M 27.700 29.620 1.060 1.230 N 2.032 2.921 0.080 0.115 O 0.255 0.610 0.010 0.024 P 5.842 6.858 0.230 0.270 TO-263 Mechanical Drawing E F A E F A I H B I H B DIM D G MILLIMETERS INCHES MIN MAX MIN MAX A 10.000 10.500 0.394 0.413 B 14.605 15.875 0.575 0.625 C 0.508 0.991 0.020 0.039 D 2.420 2.660 0.095 0.105 E 4.064 4.830 0.160 0.190 F 1.118 1.400 0.045 0.055 G 0.450 0.730 0.018 0.029 H 8.280 8.800 0.325 0.346 I 1.140 1.400 0.044 0.055 J 1.480 1.520 0.058 0.060 G C TO-263 DIMENSION C D TS39300 6-6 2005/12 rev. A H