XC6222 TOREX [Torex Semiconductor], XC6222 Datasheet - Page 8

• Manufacturer Part Number: XC6222
• Description: Reverse Current Protection, 700mA High Speed LDO Regulator
• Manufacturer: TOREX [Torex Semiconductor]

■OPERATIONAL EXPLANATION
<Input and Output Capacitors>
The XC6222 needs an output capacitor C
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 C
<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 V
suppress the reverse current to 1.5μA (MAX.). When V
pin to the V
to the CE pin, the sink current of the V
level signal is inputted to the CE pin, the sink current of the V
which may result in the IC being damaged. In this case, please do not connect a power supply to the V
Please also note when the XC6222A/C series connects external power supply to the V
<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 V
<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.
8/26
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 V
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 V
pin's signal.
●Output Capacitor (C
OUTPUT VOLTAGE (V)
VIN
CE
XC6222
0.8V～2.05V
2.1V～2.45V
2.5V～5.0V
IN
SS
of 1.0μF between the V
pin is 95μA (TYP.) as the IC operation current. With the XC6222A/C series, when a low level signal is inputted
ThermalShutdown
ON/OFF
Control
CurrentLimit
Protection
Reverce
Current
XC6222Aseries
&
circuit
each
L
Series
) Table
Error
OUT
Amp
+
-
Reference
OUT
voltage is higher than V
Voltage
CFB
pin to the V
OUTPUT CAPACITOR VALUE
IN
OUT
SS
OUT
R1
pin and the V
L
R2
C
C
C
pin, the current is decreased to a level of 55mA.
for phase compensation. Values required for the phase compensation are shown in
pin is minimized to 28μA (TYP.). However, with the XC6222B/D series, when a low
L
L
L
pin, is then driven by the subsequent output signal. The output voltage at the V
=6.8μF (MIN.)
=4.7μF (MIN.)
=2.2μF (MIN.)
IN
VOUT
VSS
pin. When V
SS
IN
pin.
voltage. Further, the IC's internal circuitry can be turned off via the CE
IN
is smaller then V
OUT
IN
is smaller than V
pin goes through the C
OUT
, the V
OUT,
the reverse current protection works and
OUT
OUT
L
pin, please use under 6.0V.
pin sink current flows from the V
auto discharge circuit to the V
OUT
pin.
SS
OUT
OUT
pin