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XC6222A28BMR-G Datasheet(PDF) 8 Page - Torex Semiconductor

Part # XC6222A28BMR-G
Description  Reverse Current Protection, 700mA High Speed LDO Regulator
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Manufacturer  TOREX [Torex Semiconductor]
Direct Link  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC6222A28BMR-G Datasheet(HTML) 8 Page - Torex Semiconductor

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XC6222 Series
OPERATIONAL EXPLANATION
The voltage divided by two resistors R1 and R2 is compared with the internal reference voltage by the error amplifier. The
P-channel MOSFET connected to the VOUT pin, is then driven by the subsequent output signal. The output voltage at the VOUT
pin is controlled and stabilized by a system of negative feedback. The current limit and short protection operate in relation to
the level of output current. The thermal protection operates in relation to the level of heat generation. The reverse current
protection operates when VOUT voltage is higher than VIN voltage. Further, the IC's internal circuitry can be turned off via the CE
pin's signal.
<Input and Output Capacitors>
The XC6222 needs an output capacitor CL for phase compensation. Values required for the phase compensation are shown in
the chart below. If a loss of the capacitance happens, stable phase compensation may not be obtained. Please ensure to
use a capacitor which does not depend on bias or temperature too much. For a stable power input, please connect an input
capacitor CIN of 1.0μF between the VIN pin and the VSS pin.
OUTPUT VOLTAGE (V)
OUTPUT CAPACITOR VALUE
0.8V~2.05V
CL=6.8μF (MIN.)
2.1V~2.45V
CL=4.7μF (MIN.)
2.5V~5.0V
CL=2.2μF (MIN.)
<Reverse Current Protection>
The XC6222 series includes reverse current protection to prevent the damage to any connected products such as batteries as a
result of current flow from the VOUT pin to the VIN pin. When VIN is smaller than VOUT, the reverse current protection works and
suppress the reverse current to 1.5μA (MAX.). When VIN is smaller then VOUT, the VOUT pin sink current flows from the VOUT
pin to the VSS pin is 95μA (TYP.) as the IC operation current. With the XC6222A/C series, when a low level signal is inputted
to the CE pin, the sink current of the VOUT pin is minimized to 28μA (TYP.). However, with the XC6222B/D series, when a low
level signal is inputted to the CE pin, the sink current of the VOUT pin goes through the CL auto discharge circuit to the VSS pin
which may result in the IC being damaged. In this case, please do not connect a power supply to the VOUT pin.
Please also note when the XC6222A/C series connects external power supply to the VOUT pin, please use under 6.0V.
<Current Limiter, Short-Circuit Protection>
The XC6222 series’ fold-back circuit operates as an output current limiter and a short protection circuit for the output pin.
When the load current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. When
the output pin is short-circuited to the VSS pin, the current is decreased to a level of 55mA.
<Thermal Shutdown>
When the junction temperature of the built-in driver transistor reaches the temperature limit level (150℃ TYP.), the thermal
shutdown circuit operates and the driver transistor will be turned OFF. The IC resumes its operation when the thermal
shutdown function is released and the IC’s operation is automatically restored because the junction temperature drops to the
level of 125℃ (TYP.) as the thermal shutdown release voltage.
ON/OFF
Control
+
-
Error
Amp
Voltage
Reference
each
circuit
CurrentLimit
&
ThermalShutdown
R1
R2
CFB
XC6222Aseries
VIN
CE
VSS
VOUT
Reverce
Current
Protection
Output Capacitor (CL) Table


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