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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 regulator with 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), providing high output current even when the application requires very low dropout voltage. The Chip Enable (CE) includes a CMOS or TTL compatible input allows the output to be turned off to prolong battery life. When shutdown, power consumption drops nearly to zero. The TS5205 series is included a precision voltage reference, error correction circuit, a current limited output driver, over temperature shutdown, revered battery protection and a reference 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 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
Typical Application Circuit
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
Part No.
TS5205CX5xx
Operating Temp.
-40 ~ +125 C
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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. Contact factory for additional voltage options.
TS5205 series
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 Temperature Range Storage Temperature Range Lead Soldering Temperature (260 C)
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Vin Vce PD ja Tj TSTG
-20~ +20 -20~ +20 Internal limited 220 -40 ~ +125 -65 ~ +150 5
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V V
C/W
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C C
S
Recommend Operating Rating (Note 3)
Input Supply Voltage Enable Input Voltage Vin Vce +2.5 ~ +16 0 ~ Vin V V
Electrical Characteristics
Vin=Vo+1V, Io=100uA, Cout=1uF, Vce2V, Tj = 25 C, unless otherwise specified.
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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
Vout 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 ppm/ C %/V %/V
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Vo+1V Vin 16V 0.1mA Io 150mA Io=100uA Io=50mA Io=100mA Io=150mA
mV
Quiescent Current
Vin0.4V (shutdown) Vin0.18V (shutdown)
uA
Ground Pin Current (Note 7)
Vce2V
Io=100uA Io=50mA Io=100mA Io=150mA
uA
Output Current Limit Power Supply Rejection Ratio Thermal Regulation (Note 8) Output Noise
Vout=0V At f=100Hz, Io=100uA,
mA dB %/W nVHz
Io=50mA, Cout=2.2uF, 470pF from bypass to Ground
--
Enable function
Enable Input Logic-Low Voltage Enable Input Logic-High 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 series
2-6
2004/09 rev. B
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] + ja. Exceeding the maximum allowable power dissipation will result in excessive 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 temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 6: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. Note 7: Ground pin current is the regulator quiescent current plus pass transistor 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 regulation effects. Specifications are for a 150mA load pulse at Vin=16V for t=10mS.
Block Diagrams
TS5205 series
3-6
2004/09 rev. B
Application Information Enable Input
Most of tantalum or aluminum electrolytic capacitors 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. are adequate; film types will work. Since many aluminum electrolytic have electrolytes that freeze at about -30 C, solid tantalums 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 for currents below 1mA.
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Input Capacitor Requirement
An input capacitor of 1uF or greater is recommended when the device is more than 10" away from the bulk AC supply capacitance or when the supply is a battery.
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.
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; when using Cbypass, output capacitors of 2.2uF or greater 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 requiring a slow ramp up of output voltage should consider 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.
Adjustable Regulator Design
The adjustable regulator versions can be adjusted to a specific output voltage by using 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. Resistors can be quite large up to 470k, because of the very high input impedance and low bias current of the sense comparator, the resistor values are 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 of this capacitor is dependent upon whether a reference 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 regulator's transient response. The output capacitor value may be increased without limit. The output capacitor should have an ESR (effective series resistance) less than 5 and a resonant frequency above 1MHz. Ultra low ESR capacitors can cause a low amplitude oscillation on the output and/or under damped transient response. 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 negative supply, the output voltage must be diode clamped to ground.
TS5205 series
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 power dissipation of the package, use the junction-ambient thermal resistance of the device and the following basic equation: Pd(max) = [ Tj(max) - Ta ] /ja Tj(max) is the maximum junction temperature of the die(125 C),
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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 minimum. is not required. Cout= 2.2uF
and
Ta
is
the
ambient
operating
temperature. ja 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 example, 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 C - 25 C) / 220 C/W Pd(max) = 455mW The junction to ambient thermal resistance for the minimum footprint 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. 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 application at 150mA of output current can accept a maximum input voltage of 6.23V in a SOT-25 package.
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Low Noise Fixed Voltage Application An example of a low noise configuration where Cbypass is not required. Cout= 1uF minimum
TS5205 series
5-6
2004/09 rev. B
SOT-25 Mechanical Drawing
SOT-25 DIMENSION DIM A B C D E F H L MILLIMETERS MIN 2.70 0.25 MAX 3.00 0.50 INCHES MIN 0.106 0.010 MAX 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 series
6-6
2004/09 rev. B

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