TS5205_1

TS5205 150mA Low Noise LDO Voltage Regulator with Enable Pin assignment 1. Input 2. Ground 3. Enable 4. Bypass / Adjust 5. Output Low Power Consumption Low DropOut Voltage 0.275V Fixed and Adjustable Output Enable Shutdown General Description The TS5205 series is an efficient linear voltage regula tor w ith ultra low noise output, very low dropout voltage (typically 17mV at light loads and 165mV at 150mA), and very low power consumption (600uA at 100mA), provid ing high ou tput current even when the application requires very low dropou t voltage. The Chip Enable (CE) includes a CM OS o r TTL compatible input a llows the output to be turned off to prolo ng battery life . When shutdown, power consumption d rops nearly to zero . The TS5205 series is included a precision voltage refe rence, erro r correction circuit, a curren t limited output d river, over temperature shutdown, revered ba ttery protec tion and a refe rence bypass pin to improve its already excellent low -noise performance. The TS5205 series is available in fixed and adjustable output voltage version in 5 -pin SOT -25 package. Features       Ultra low noise outpu t. Output current up to 150mA Low dropout voltage Low power consumption “Zero” o ff-mode curren t Logic controlled electronic enable Internal cu rrent lim it and Thermal shutdown protection Typical Application Circuit  Applications      Cellular telephones Palmtops, notebook computers Battery powered equipmen t Consumer and personal electronics SMPS post regula tor and D C to DC modules High-efficiency linear powe r supplies  Ordering Information Part No. T S5 2 0 5 CX5 x x Operat ing Temp. -40 ~ +125 C o Package SOT-25 Note: Where xx denotes voltage option, available are 5.0V, 3 .3V, 3 .0V, 2.9V, 2.8V and 2.5V . Leave blank for adjustable version . Con tact factory for additional voltage options. TS5205 ser ies 1 -6 2004/09 rev. B Absolute Maximum Rating (Note 1) Input Supply Voltage Enable Input Voltage Power Dissipation (Note 2) Thermal Resistance Operating Junction Tempera ture Range Storage Temperatu re Range Lead Soldering Temperature (260 C) o Vin Vc e PD Өja Tj TSTG -20~ +20 -20~ +20 Internal lim ited 220 -40 ~ +125 -65 ~ +150 5 o V V C/W o o C C S Recommend Operating Rating (Note 3) Input Supply Voltage Enable Input Voltage Vin Vc e +2.5 ~ +16 0 ~ Vin V V Electrical Characteristics Vin=Vo+1V, Io=100uA, Cout=1uF, Vce≥2V, Tj = 25 C, unles s otherwise specified. o Parameter Output Voltage Output Voltage Temp. Coefficient Line Regulation Load Regulation (Note 5) Dropout Voltage (Note 6 ) (Note 4) Conditions Vin=Vo + 1V Min 0.99|Vo| ----------------- Typ Vo u t 40 0.005 0.02 17 110 140 165 0.01 -80 350 600 1300 300 75 0.05 260 Max 1.01|Vo| -0.05 0.2 50 150 250 275 1 5 125 600 1000 1900 500 ---- Unit V p p m/ C %/V %/V o Vo+1V ≤ Vin ≤ 16V 0.1mA ≤ Io ≤ 150mA Io=100uA Io=50mA Io=100mA Io=150mA mV Quiescent Current Vin≤0.4V (shutdown) Vin≤0.18V (shutdown) Vc e ≥ 2 V Io=100uA Io=50mA Io=100mA Io=150mA uA Ground Pin Cu rrent (Note 7) uA Output Current L imit Power Supply Rejection Ratio Thermal Regulation (Note 8) Output Noise Vout=0V At f=100Hz, Io=100uA, mA dB %/W nV√Hz Io=50mA, Cout=2.2uF, 470pF from bypass to G round -- Enable funct ion Enable Input Logic-Low Voltage Enable Input Logic-H igh Voltage Enable Input Current Regulation shutdown Regulation enable VIL≤ 0.4V VIH≥ 2.0V -2.0 ----0.01 5 0.4 --1 20 V V uA TS5205 ser ies 2 -6 2004/09 rev. B Electrical Characteristics (continued) Note 1: Exceeding the absolute maximum rating may damag e the device. Note 2: The maximum allowable power dissipation at any Ta is Pd(max) = [ Tj(max) - Ta] + Ө ja. Exceeding the maximum allowable powe r dissipation w ill result in excessive die tempera ture, and the regulato r will go into thermal shutdown. Note 3: The device is not guaranteed to function outside its o perating ra ting. Note 4: Output voltage temperatu re coefficient is defined as the worst case voltage change divided by the total temperature range. Note 5: Regulation is measured at constant junction tempera ture using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 1 mA to 150mA. C hanges in output voltage due to heating effects are covered by the the rmal regulation specification. Note 6: D ropout voltage is defined as the input to output d ifferential a t which the outpu t voltage drops 2% below its nominal value measured at 1V differential. Note 7: Ground pin current is the regula tor quiescent current plus pass transisto r base current. The tota l current drawn fro m the supply is the sum of the load current plus the ground pin current. Note 8: Thermal regulation is defined as the change in output voltage at a time “t” afte r a change in power dissipation is applied, excluding load o r line regula tion e ffects. Specifications are fo r a 150mA load pulse a t V in=16V for t=10mS. Block Diagrams TS5205 ser ies 3 -6 2004/09 rev. B Application Information Enable Input Most of tantalum or alum inum electroly tic capacitors TS5205 series feature an active-high (>2V) enable (EN ) input that a llows ON /OFF control of the regulato r. Current d rain reduces to “ze ro” when the device is shutdown, with only micro-a mperes of leakage curren t. The EN is compatible with C MOS logic inte rfacing. EN may be directly tied to Vin and pulled up to the maximum supply voltage. are adequate; film types will wo rk. Since many aluminum electrolytic have electrolytes that freeze at about –30 C, solid tan talums are recommended for operation below –25 C. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0 .47uF for current below 10mA or 0.33uF fo r currents below 1mA . o o Input Capacitor Requirement An input capacitor of 1uF or greate r is recommended when the device is mo re than 10 ” away from the bulk AC supply capacitance or when the supply is a batte ry. No Load Stability The TS5205 series iwill remain stable and in regulation with no load, unlike many other voltage regulators. This is especially importan t in CMOS RAM keep alive applications. Reference Bypass Capacitor Bypass is connected to the inte rnal voltage refe rence. A 470uF capacitor (Cbypass) connected from Bypass to Ground quiets this refe rence, providing a significant reduction in output noise. Cbypass reduces the regulator phase marg in; when using Cbypass, output capacitors of 2.2uF or greater a re generally required to maintain stability . The star up speed of the TS5205 is inversely proportional to the size o f the refe rence bypass capacitor. Applications requiring a slow ra mp up of output voltage should consider large r values of Cbypass. Likewise, if rapid turn on is necessary, consider omitting Cbypass. If output noise is not a major concern, om itted Cbypass and leave Bypass open. Adjustable Regulator Design The adjustable regulator versions can be adjusted to a specific output voltage by using two external resisto rs to programm ing the output voltage anywhere between 1.25 and the 16V maximum operating rating of the family. Two resistors a re used. Resis tors can be quite la rge up to 470kΩ, because of the very high input impedance and low bias cu rrent of the sense comparator, the resistor values a re calculated by: Vout = 1.242V * (R2 / R1 + 1) Output Capacitor Requirement The TS5205 series requires an output capacitor to maintain stability and improve transient response is necessary. The value o f this capacitor is dependent upon whether a refe rence bypass capacitor is used. 1uF minimum is recommended when Cbypass is not used. 2.2uF minimum is recommended when Cbypass is 470uF. Larger values improve the regula tor’s transient response. The outpu t capacitor value may be increased without limit. The output capacitor should have an ESR (e ffective series resistance) less than 5 Ω and a resonant frequency above 1MHz. Ultra low ES R capacitors can cause a low amplitude oscillation on the output and/or under damped transient response. A capacitor from Ad j to G round provides greatly improved noise perfo rmance. Dual Supply Operation When used in dual supply systems where the regulator load is retu rned to a negative supply, the output voltage must be diode clamped to ground. TS5205 ser ies 4 -6 2004/09 rev. B Application Information (continues) Thermal Characteristics TS5205 series is designed to provide 150mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum powe r dissipation of the package, use the junction-ambient the rmal resistance of the device and the follow ing basic equation: Pd(max) = [ Tj(max) – Ta ] /Θ ja Tj(max) is the maximum junction tempe rature o f the die(125 C), o Fixed Output Regulator Application Ultra Low No ise Fixed Voltage Application Includes a 470uF capacitor fo r low noise operation and shows EN connected to IN for an application where enable/shutdown minimum . is not required. Cout= 2 .2uF and Ta is the ambient operating temperature . Θja is layout dependent, the actual power dissipation of the regulato r circuit can be determined using the equation: Pd = ( Vin – Vout ) * Iout + Vin * Ignd Substituting Pd(max) fo r Pd and solving for the operating conditions that are c ritical to the application will give the maximum operating conditions fo r the regulator circuit. For example, when operating the TS5205CX533 at room tempe rature with a minimum footprint layout, the maximum input voltage for a set output current can be determ ined as follows: Pd(max) = (125 C – 25 C) / 220 C/W Pd(max) = 455mW The junction to a mbient therma l resistance fo r the minimum footp rint is 220 C/W, the maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 150mA, the maximum input voltage can be determined. Form t eh electrical characteristics table, the maximum ground curren t fo r 150mA output current is 2.5mA. 445mW = ( Vin – 3.3V ) * 150mA + V in * 2.5mA 445mW = Vin * 150mA – 3 .3 * 150mA + Vin * 2 .5mA 445mW = Vin * 150mA – 495mW + Vin * 2 .5mA 950mW = Vin * 152.5mA Vin(max) = 6.23v Therefore, a 3.3V application at 150mA o f output current can accept a maximum input voltage of 6.23V in a SOT-25 package. o o o o Low Noise Fixed Vo ltage Application An example of a low noise configura tion where Cbypass is not required. Cout= 1uF minimum TS5205 ser ies 5 -6 2004/09 rev. B SOT-25 Mechanical Drawing SOT-25 DIME NSION DIM A B C D E F H L MILLIMETERS MIN 2.70 0.25 MA X 3.00 0.50 INCHES MIN 0.106 0.010 MA X 0.118 0.020 1.90(typ) 0.95(typ) 1.50 1.05 2.60 1.70 1.35 3.00 0.075(typ) 0.037(typ) 0.059 0.041 0.102 0.067 0.053 0.118 0.60(typ) 0.024(typ) TS5205 ser ies 6 -6 2004/09 rev. B