XC6214_2 Datasheet, PDF (8/26 Pages) Torex Semiconductor – 500mA Output Current, High Speed LDO Regulators, Thermal Shutdown Function, Ceramic Capacitor Compatible

XC6214 Series
˙OPERATIONAL EXPLANATION
<Output Voltage Regulator Control>
The voltage, divided by resistors R1 & R2, which are connected to the VOUT pin is compared with the internal reference
voltage by the error amplifier. The P-channel MOSFET, which is connected to the VOUT pin, is then driven by the
subsequent output signal. The output voltage at the VOUT pin is controlled & stabilized by negative feedback. The
current limit circuit and over current protection operate in relation to the level of output current and heat.
VIN
Current Limit
S
Thermal
Shutdown
+
-
Voltage
Reference
VOUT
R1
S
R2
VSS
<Low ESR Capacitors>
With the XC6214 series regulator, a stable output voltage is achievable even if low ESR capacitors are used, as a phase
compensation circuit is built-in to the regulator. In order to ensure the stability of the load transient response and line
transient response, we suggest that an output capacitor (CL) be connected as close as possible, between the output pin
(VOUT) and the VSS pin. Please use an output capacitor (CL) with a capacitance more than 0.1ЖF. We also suggest an
input capacitor (CIN) of 0.1ЖF: this should be connected between VIN and VSS in order to stabilize input power source.
<Current Limiter, Short-Circuit Protection>
The XC6214 series regulator offers a combination of current limit and circuit protection by means of a built-in fixed
current limiter circuit and a foldback circuit. When the output pin is shorted, a current of about 50mA flows.
<Thermal Shutdown>
When the junction temperature of the built-in driver transistor reaches the temperature limit level (150ˆ TYP.), the
thermal shutdown circuit operates and the driver transistor will be set to OFF. The thermal shutdown function will be
released (automatically recovered) when the junction temperature decreases to the thermal shutdown release
temperature level (125ˆ TYP.) and the IC re-starts the operation.
˙NOTES ON USE
1. Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be
exceeded.
2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output
current. Please strengthen VIN and VSS wiring in particular.
3. Please wire the input capacitor (CIN) and the output capacitor (CL) as close to the IC as possible.
4. Output voltage may increase when the IC is used at light load current (around 0 to 2ЖA) depending on temperature
conditions, etc.
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