XC6222D251MR-G datasheet(8/26 Pages) TOREX

Part #	XC6222D251MR-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

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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.

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.)

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 it within the range

from VOUT(E) (actual output voltage value)or more to 6.0V or less. When the voltage less than VOUT(E) is applied to the VOUT pin by

adding a power supply or battery, a low level signal should be input to the CE pin for chip disable in order to protect a reverse

current at VIN < VOUT.

Example) The voltage less than VOUT(E) (actual output voltage value) is applied to the VOUT pin as "OR" connection.

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

* When the CE pin is connected to the VIN pin, an output voltage 2.8V

from the step-up DC/DC goes through to the VIN pin as reverse

current up to around 150mA if the USB connection is removed from

the VIN pin (VIN < VOUT). CE pin voltage should be maintained low

when the USB connection is removed from the VIN pin.

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