TS9007_07 Datasheet, PDF (3/8 Pages) Taiwan Semiconductor Company, Ltd – 300mA Low Noise CMOS LDO

TS9007
300mA Low Noise CMOS LDO
Application Information
Enable / Shutdown
The TS9007 comes with and active-high enable pin that allows the regulator to be enabled. Forcing the enable pin low
disables the regulator and puts it into the shutdown mode. This pin cannot be left floating as it may cause an
undetermined state.
Input / Output Capacitor
It is recommended to use a 0.47uF capacitor on the TS9007 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 TS9007 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 300mA. As shown in the functional block
diagram, the TS9007 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 TS9007 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 TS9007 will remain stable and in
regulation with no load, unlike many other voltage regulators.
Internal P-Channel Pass Transistor
The TS9007 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 TS9007
consumes only 90µA of quiescent current under most conditions.
Output Short-Circuit Current Limit
The TS9007 includes a current limiter, which monitors and controls the pass transistor’s gage voltage, limiting the
output current to about 200mA, for example, in a short-circuit output situation.
Shutdown
The TS9007 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.
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Version: C07