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2015-03-0006 PT0433-4 05/06/15
4
PT7M8216
300mA, High PSRR, Tiny package, LDO Regulator
Block Diagram
Over-current
Protection Circuit
ON/OFF
Circuit
Ref erence
Voltage C ircuit
EN
VIN
VOUT
GND
Functional Description (Refer to Block Diagram)
Output Voltage
The divided output voltage is compared with the internal reference voltage by the error amplifier with internal phase
compensator. The output of the error amplifier then drives the P-channel MOSFET to maintain a stable and constant output
voltage.
Low ESR Capacitors
The internal phase compensator maintains the stable output voltage with low ESR ceramic input and output capacitors. 0.47F
low ESR (X5R/X7R) ceramic capacitor located as close as possible to the IC’s pins is recommended.
Current Limit and Thermal Shutdown Protections
Current limit protection is used to limit the output current when an overload condition occurs. As a result, the output voltage
will drop. Thermal shutdown protection will turn off the output to reduce the power dissipation when the operation junction
temperature exceeds 170°C .
EN Pin
The output of the regulator in PT7M8216 can be controlled with EN pin. The EN pin should be connected to a “VIN” or a
“GND” voltage as a floating input applied to inverter input of the enable circuitry will increase the current consumption.
NOTE ON USE
Please use this IC within the stated absolute maximum ratings.
Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output current.
Please keep the resistance low between VIN and GND wiring in particular.
Please wire the input capacitor (Cin) and the output capacitor (Cout) as close to the IC as possible.
