TS5201_08 Datasheet, PDF (3/7 Pages) Taiwan Semiconductor Company, Ltd – 200mA Low Noise LDO Voltage Regulator with Enable

TS5201
200mA Low Noise LDO
Voltage Regulator with Enable
Electrical Specification (Continue)
Note:
1. Exceeding the absolute maximum rating may damage the device.
2. The maximum allowable power dissipation at any Ta is Pd(max) = [T_J(MAX) - Ta] + Ó¨_JA. Exceeding the maximum
allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
3. The device is not guaranteed to function outside its operating rating.
4, Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature
range.
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 200mA (5V version) and 1mA to 120mA (V_OUT<5V version). Changes
in output voltage due to heating effects are covered by the thermal regulation specification.
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.
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.
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 200mA load pulse at V_IN=16V for t=10mS.
Application Information
Enable Input
TS5201 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 V_IN and pulled up to the maximum supply voltage.
Input Capacitor Requirement
An input capacitor of 0.1uF 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.
Output Capacitor Requirement
The TS5201 series requires an output capacitor to maintain stability and improve transient response is necessary.
2.2uF minimum is recommended. 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 5Ω 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. Most of tantalum or aluminum electrolytic capacitors are adequate; film types will work. Since many
aluminum electrolytic have electrolytes that freeze at about –30^oC, solid tantalums are recommended for operation
below –25^oC. 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.
Reference Bypass Capacitor
Bypass is connected to the internal voltage reference. A 470pF capacitor (C_BYPASS) connected from Bypass to
Ground quiets this reference, providing a significant reduction in output noise. C_BYPASS reduces the regulator phase
margin; when using C_BYPASS, output capacitors of 2.2uF or greater are generally required to maintain stability.
The star up speed of the TS5201 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 C_BYPASS. Likewise, if rapid turn on is
necessary, consider omitting C_BYPASS. If output noise is not a major concern, omitted C_BYPASS and leave Bypass open.
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Version: B07