XC6221C081GR-G datasheet(8/23 Pages) TOREX

Part #	XC6221C081GR-G

Description	Low ESR Caps Compatible High Speed LDO Voltage Regulators with ON/OFF Switch

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Manufacturer	TOREX [Torex Semiconductor]

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8 / 23 page

8/23

XC6221 Series

each

circuit

ON/OFF

Control

CE

VIN

VSS

VOUT

R1

R2

Error

Amp

-

+

CE

CE/

Voltage

Reference

Current

Limit

CE/

Rdischg

●

Except USPN-4

OUTPUT VOLTAGE (V)

OUTPUT CAPACITOR VALUE

0.8V～1.15V

CL ≧4.7μF

1.2V～1.35V

CL ≧2.2μF

1.4V～4.0V

CL ≧1.0μF

4.05V～5.0V

CL ≧2.2μF

●

USPN-4

OUTPUT VOLTAGE (V)

OUTPUT CAPACITOR VALUE

1.2V～4.0V

CL ≧2.2μF

4.05V～5.0V

CL ≧4.7μF

■

OPERATIONAL EXPLANATION

The voltage divided by resistors R1 & 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 & stabilized by a system of negative feedback. The current limit circuit and short protect circuit

operate in relation to the level of output current. Further, the IC's internal circuitry can be shutdown via the CE pin's signal.

The XC6221 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, the 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.

XC6221B/D series can discharge the electric charge in the output capacitor (CL), when a low signal to the CE pin, which

enables the whole IC circuit to be turned off, is inputted via the N-channel transistor located between the VOUT pin and

the VSS pin (cf. BLOCK DIAGRAM). The CL auto-discharge resistance value is set at 780Ω(VOUT=4.0V @ VIN=6.0V at

typical). The discharge time of the output capacitor (CL) is set by the CL auto-discharge resistance (R) and the output

capacitor (CL). By setting the time constant of the CL auto-discharge resistance value [RDCHG] and the output capacitor

value (CL) as τ(τ=C x RDCHG), the output voltage after discharge via the N-channel transistor is calculated by the

following formula.

V = VOUT(E) x e

–t/τ, or t=τIn ( V / VOUT(E) )

where

V : Output voltage after discharge

VOUT (E) : Output voltage

t : Discharge time

τ

: CL auto-discharge resistance RDCHG×Output capacitor (CL) value C)

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XC6221C081GR-G Datasheet(PDF) 8 Page - Torex Semiconductor

XC6221C081GR-G Datasheet(HTML) 8 Page - Torex Semiconductor

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