TS5205 TSC | Alldatasheet
Document overview
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Technical content
Features
Ultra low noise output. Output current up to 150mA Low dropout voltage Low power consumption “Zero” off-mode current Logic controlled electronic enable Internal current limit and Thermal shutdown protection
Applications
Cellular telephones Palmtops, notebook computers Battery powered equipment Consumer and personal electronics SMPS post regulator and DC to DC modules High-efficiency linear power supplies
Ordering Information
Note: Where xx denotes voltage opti on, available are blank for adjustable version. Contact factory for additional voltage options. Part No. Operating Temp. Package TS5205CX5xx -40 ~ +125 oC SOT-25 Typical Application Circuit Pin assignment 1. Input 2. Ground 3. Enable 4. Bypass / Adjust 5. Output
TS5205 series 2-6 2004/09 rev. A Absolute Maximum Rating (Note 1) Input Supply Voltage Vin -20~ +20 V Enable Input Voltage Vce -20~ +20 V Power Dissipation (Note 2) P D Internal limited Thermal Resistance Өja 220 oC/W Operating Junction Temperature Range Tj -40 ~ +125 oC Storage Temperature Range T STG -65 ~ +150 oC Lead Soldering Temperature (260 oC) 5 S Recommend Operating Rating (Note 3) Input Supply Voltage Vin +2.5 ~ +16 V Enable Input Voltage Vce 0 ~ Vin V
Electrical Characteristics
Vin=Vo+1V, Io=100uA, Cout=1uF, Vce≥2V, Tj = 25 oC, unless otherwise specified. Parameter Conditions Min Typ Max Unit Output Voltage Vin=Vo + 1V 0.99|Vo| Vout 1.01|Vo| V Output Voltage Temp. Coefficient (Note 4) -- 40 -- ppm/ oC Line Regulation Vo+1V ≤ Vin ≤ 16V -- 0.005 0.05 %/V Load Regulation (Note 5) 0.1mA ≤ Io ≤ 150mA -- 0.02 0.2 %/V Io=100uA -- 17 50 Io=50mA -- 110 150 Io=100mA -- 140 250 Dropout Voltage (Note 6) Io=150mA -- 165 275 mV Quiescent Current Vin ≤0.4V (shutdown) Vin≤0.18V (shutdown) 0.01 uA Io=100uA -- 80 125 Io=50mA -- 350 600 Io=100mA -- 600 1000 Ground Pin Current (Note 7) Vce ≥2V Io=150mA -- 1300 1900 uA Output Current Limit Vout=0V -- 300 500 mA Power Supply Rejection Ratio At f=100Hz, Io=100uA, -- 75 -- dB Thermal Regulation (Note 8) -- 0.05 -- %/W Output Noise Io=50mA, Cout=2.2uF, 470pF from bypass to Ground -- 260 -- nV √Hz Enable function Enable Input Logic-Low Voltage R egulation shutdown -- -- 0.4 V Enable Input Logic-High Voltage Regulation enable 2.0 -- -- V VIL≤ 0.4V -- 0.01 -1 Enable Input Current VIH≥ 2.0V -- 5 20 uA
TS5205 series 3-6 2004/09 rev. A Electrical Characteristics (continued) Note 1: Exceeding the absolute maximum rating may damage the device. Note 2: The maximum allowable power dissipation at any Ta is Pd(max) = [ Tj(max) - Ta] + Өja. Exceeding the maximum allowable power dissipation will result in exce ssive die temperature, and the regulator will go into thermal shutdown. Note 3: The device is not guaranteed to function outside its operating rating. Note 4: Output voltage tem perature coefficient is defi ned as the worst case voltage change divided by the total temperature range. Note 5: Regulation is measur ed at constant junction temper ature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 1mA to 150mA. Changes in output vo ltage due to heating effects are covered by the thermal regulation specification. Note 6: Dropout voltage is defined as t he input to output differential at whic h the output voltage dr ops 2% below its nominal value measured at 1V differential. Note 7: Ground pin current is the regul ator quiescent current plus pass trans istor base current. The total current drawn from 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” after a change in power dissipation is applied, excluding load or line regul ation effects. Specifications are for a 150mA load pulse at Vin=16V for t=10mS. Block Diagrams
TS5205 series 4-6 2004/09 rev. A
Application Information
TS5205 series feature an active-high (>2V) enable (EN) input that allows ON/OFF control of the regulator. Current drain reduces to “zero” when the device is shutdown, with only micro- amperes of leakage current. The EN is compatible with CMOS logic interfacing. EN may be directly tied to Vin and pulled up to the maximum supply voltage. Input Capacitor Requirement An input capacitor of 1uF or greater is recommended when the device is more t han 10” away from the bulk AC supply capacitance or when the supply is a battery. Reference Bypass Capacitor Bypass is connected to the internal voltage reference. A 470uF capacitor (Cbypass) connected from Bypass to Ground quiets this reference, providing a significant reduction in output noise. Cbypass reduces the regulator phase margin; w hen using Cbypass, output capacitors of 2.2uF or great er are generally required to maintain stability. The star up speed of the TS5205 is inversely proportional to the size of the reference bypass capacitor. Applications r equiring a slow ramp up of output voltage should consi der larger values of Cbypass. Likewise, if rapid turn on is necessary, consider omitting Cbypass. If output noise is not a major concern, omitted Cbypass and leave Bypass open. Output Capacitor Requirement The TS5205 series requires an output capacitor to maintain stability and improv e transient response is necessary. The value of this capacitor is dependent upon whether a reference by pass capacitor is used. 1uF minimum is recommended when Cbypass is not used. 2.2uF minimum is recommended when Cbypass is 470uF. Larger values im prove the regulator’s transient response. The out put capacitor value may be increased without limit. The output capacitor shoul d have an ESR (effective series resistance) less than 5 Ω and a resonant frequency above 1MHz. Ultra low ESR capacitors can cause a low amplitude osc illation on the output and/or under damped transient response. Most of tantalum or alumi num electrolytic capacitors are adequate; film types will work. Since many aluminum electrolytic have el ectrolytes that freeze at about –30 oC, solid tantalums are recommended for operation below –25 oC. At lower values of output current, less output capacitanc e is required for output stability. The capacitor c an be reduced to 0.47uF for current below 10mA or 0.33uF for currents below 1mA. No Load Stability The TS5205 series iwill remain stable and in regulation with no load, unlike many other voltage regulators. This is especially important in CMOS RAM keep alive applications. Adjustable Regulator Design The adjustable regulator versions can be adjusted to a specific output voltage by us ing two external resistors to programming the output voltage anywhere between 1.25 and the 16V maximum operating rating of the family. Two resistors are used. Re sistors can be quite large up to 470k Ω, because of the very high input impedance and low bias cu rrent of the sense comparator, the resistor values are calculated by: Vout = 1.242V * (R2 / R1 + 1) A capacitor from Adj to Ground provides greatly improved noise performance. Dual Supply Operation When used in dual supply systems where the regulator load is returned to a negat ive supply, the output voltage must be diode clamped to ground.
TS5205 series 5-6 2004/09 rev. A 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 pow er dissipation of the package, use the junction-am bient thermal resistance of the device and the following basic equation: Pd(max) = [ Tj(max) – Ta ] /Θja Tj(max) is the maximum j unction temperature of the die(125 oC), and Ta is the ambient operating temperature. Θja is layout dependent, the actual power dissipation of the regulator circuit can be determined using the equation: Pd = ( Vin – Vout ) * Iout + Vin * Ignd Substituting Pd(max) for Pd and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For ex ample, when operating the TS5205CX533 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: Pd(max) = (125 oC – 25oC) / 220oC/W Pd(max) = 455mW The junction to ambient thermal resistance for the minimum footprint is 220 oC/W, the maximum power dissipation must not be ex ceeded for proper operation. Using the output voltage of 3.3V and an output current of 150mA, the maximu m input voltage can be determined. Formt eh electrical characteristics table, the maximum ground current for 150mA output current is 2.5mA. 445mW = ( Vin – 3.3V ) * 150mA + Vin * 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 applic ation at 150mA of output current can accept a maxi mum input voltage of 6.23V in a SOT-25 package. Fixed Output Regulator Application Ultra Low Noise Fixed Voltage Application Includes a 470uF capacitor for low noise operation and shows EN connected to IN for an application where enable/shutdown is not r equired. Cout= 2.2uF minimum. Low Noise Fixed Voltage Application An example of a low noise configuration where Cbypass is not required. Cout= 1uF minimum
TS5205 series 6-6 2004/09 rev. A SOT-25 Mechanical Drawing SOT-25 DIMENSION MILLIMETERS INCHES DIM MIN MAX MIN MAX A 2.70 3.00 0.106 0.118 B 0.25 0.50 0.010 0.020 C 1.90(typ) 0.075(typ) D 0.95(typ) 0.037(typ) E 1.50 1.70 0.059 0.067 F 1.05 1.35 0.041 0.053 H 2.60 3.00 0.102 0.118 L 0.60(typ) 0.024(typ)