YB1230 Datasheet, PDF (7/10 Pages) YOBON TECHNOLOGIES,INC. – Low-Noise LDO Regulator

YB1230 – 600mA
Low-Noise LDO Regulator
including low operating power and longer
battery life. The YB1230 consumes only
90µA of quiescent current under most
conditions.
charged with a reduced output current.
Shortly after the initial power up, the
soft-start feature is terminated and normal
operation is resumed.
Output Short-Circuit Current Limit
Application Information
The YB1230 includes a current limiter,
which monitors and controls the pass
transistor’s gate voltage, limiting the output
current to about 380mA, for example, in a
short-circuit output situation.
Shutdown
The YB1230 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 +160°C, the thermal
sensor signals the shutdown logic, turning
off the pass transistor and allowing the IC
to cool down. The thermal sensor turns the
pass transistor on again after the IC’s
junction temperature drops to +140°C.
Enable/Shutdown
The YB1230 comes with an 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 2.2µF capacitor
on the YB1230 input and a 2.2µF 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.
Soft-Start Circuitry
The YB1230 includes a soft-start circuitry to
limit inrush current at turn-on. During power
up, the output capacitor and output load are
YB1230 MRev 1.4
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