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TS9005 Datasheet(PDF) 3 Page - Taiwan Semiconductor Company, Ltd

Part No. TS9005
Description  600mA Low Noise CMOS LDO
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Maker  TSC [Taiwan Semiconductor Company, Ltd]
Homepage  http://www.taiwansemi.com
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TS9005 Datasheet(HTML) 3 Page - Taiwan Semiconductor Company, Ltd

   
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TS9005
600mA Low Noise CMOS LDO
3/7
Version: A07
Application Information
Input / Output Capacitor
It is recommended to use a 0.47uF capacitor on the TS9005/A input and a 0.47uF capacitor on the output. For high
regulation performance, larger input capacitor values and lower ESRs provide better noise rejection and line-transient
response. The output noise, load-transient response, stability, and power-supply rejection can be improved by using
large output capacitors. Low ESR ceramic capacitors provide optimal performance and save space.
Power Supply Rejection and Transient Response
The PSRR and transient response can be improved by increasing the values of the input and output bypass
capacitors, and through passive filtering techniques
Function Description
Description
The TS9005/A is an ultra-low-noise, low-quiescent current, low-dropout linear regulator. It is supplied in a SOT-25
package for difference applications. This device can supply loads up to 600mA. As shown in the functional block
diagram, the TS9005/A consists of a reference and noise bypass circuit, error amplifier, output drive transistor, internal
feedback voltage divider, thermal sensor, and short circuit current limiter. The internal reference is connected to the
error amplifier’s inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the
difference. If the feedback voltage is lower than the reference voltage, the pass transistor gate is pulled low. This allows
more current to pass to the output and increases the output voltage.
Stability
The TS9005/A is a high performance LDO emphasizing stability with low output capacitance. It is able to maintain
stability with an output capacitor can also be increased to optimize performance. The TS9005/A will remain stable and
in regulation with no load, unlike many other voltage regulators.
Internal P-Channel Pass Transistor
The TS9005/A features a low impedance P-channel MOSFET pass transistor. This provides several advantages over
similar designs using a PNP pass transistor, including low operating power and longer battery life. The TS9005/A
consumes only 100µA of quiescent current under most conditions.
Output Short-Circuit Current Limit
The TS9005/A includes a current limiter, which monitors and controls the pass transistor’s gage voltage, limiting the
output current to about 420mA, for example, in a short-circuit output situation.
Shutdown
The TS9005/A also features a low-power active shutdown mode. It has a switch that turns off the device when disabled.
This allows the output capacitor and load to discharge and de-energize the load. In the shutdown mode, the internal
functional blocks, such as voltage reference and the error amplifier, are turned off completely, and the quiescent current
is less than 1µA.
Thermal Protection Shutdown
The thermal protection shutdown function protects the device from operating in over temperature condition. When the
junction temperature exceeds +160oC, the thermal sensor signals the shutdown logic, turning off the pass transistor
and allowing the IC to tool down. The thermal sensor turns the pass transistor on again after the IC’s junction
temperature drops to +140oC.
Soft-Start Circuitry
The TS9005/A includes a soft-start circuitry to limit inrush current at turn-on. During power up, the output capacitor and
output load are charged with a reduce output current. Shortly after the initial power up, the soft-start feature is
terminated and normal operation is resumed.


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