YB1210 – 300mA
Ultra-Low-Noise, High PSRR LDO Regulator
designs using a PNP pass transistor,
including low operating power and longer
battery life. The YB1210 consumes only
90µA of quiescent current under most
conditions.
up, the output capacitor and output load are
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 YB1210 includes a current limiter,
which monitors and controls the pass
transistor’s gate voltage, limiting the output
current to about 200mA, for example, in a
short-circuit output situation.
Enable/Shutdown
The YB1210 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.
Shutdown
The YB1210 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.
Input/Output Capacitor
It is recommended to use a 0.47µF
capacitor on the YB1210 input and a
0.47µF 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.
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.
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.
Soft-Start Circuitry
The YB1210 includes a soft-start circuitry to
limit inrush current at turn-on. During power
YB1210 MRev.1.5
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YOBON [ YOBON TECHNOLOGIES,INC. ]
