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TS9009 Datasheet(HTML) 3 Page - Taiwan Semiconductor Company, Ltd

Part No. TS9009
Description  80mA CMOS Low Dropout Voltage Regulator with Enable
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Maker  TSC [Taiwan Semiconductor Company, Ltd]
Homepage  http://www.taiwansemi.com
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TS9009 Datasheet(HTML) 3 Page - Taiwan Semiconductor Company, Ltd

   
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TS9009 series
3-5
2003/12 rev. B
Electrical Characteristics
Note 1: Exceeding the absolute maximum rating may damage the device.
Note 2: The device is not guaranteed to function outside its operating rating.
Note 3: The maximum allowable power dissipation at any Ta is Pd(max) = [ Tj(max) - Ta] * Өja. Exceeding the
maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into
thermal shutdown.
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 80mA. 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 80mA load pulse at Vin=16V for
t=10mS.
Applications Information
Input Capacitor
Place an 0.1uF capacitor from Vin to Gnd in applications where there is more than 10 inches of wire between the input
and the AC filter capacitor, or where a battery is used as the input.
Output Capacitor
As with any PNP-based regulator, the TS9009 requires an output capacitor to prevent oscillation. However, the TS9009
is extremely stable, and requires only 0.47uF of output capacitance for stability. It can be used with any type of
capacitor, but it works great with cheap, tiny ceramic capacitors, it also can be increased the output capacitor value
without limit to improve transient response.
Caveat: used a capacitor with a resonant frequency above 500KHz. Ceramic capacitors work great, but some
dielectrics have poor temperature coefficients, which affect the capacitance value over temperature. Tantalum
capacitors are very stable over temperature, but are larger and much more expensive. Aluminum electrolytic capacitors
also work, but they have electrolytes which freeze at –30
oC. So, used tantalum or ceramic capacitors for operation
below -25
oC.
No Load Stability
Unlike most regulators, the TS9009 will remain stable and in regulation with no load other than the internal voltage
divider. The makes TS9009 ideal for CMOS RAM keep alive applications.
Enable Input
The Ts9009 have practically zero off-mode current. When the chip enable input (CE) is held below 0.6V, the TS9009 is
powered off. Pulling CE high over 2V will be turned on the regulation. When the CE is held low, the regulator typically
draws only 15nA of current. While the logic threshold is TTL/CMOS compatible, CE may be pulled as high as 20V,
independent to Vin.


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