XC6225 データシートの表示（PDF） - TOREX SEMICONDUCTOR

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XC6225

30mA High Speed LDO Regulator

TOREX SEMICONDUCTOR 

XC6225

Series

■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 and stabilized by a system of negative feedback. The current limit circuit and short-circuit protection circuit operate in

relation to the level of output current. Further, the IC’s entire circuitry is turned off by the input signal to the CE pin.

●BLOCK DIAGRAM

CE

ON/OFF

Control

CE

CE/

each

circuit

-

Error

Amp

+

Current

Limit

V IN

R1 Rdischg

CE/

V OUT

Voltage

Reference

R2

VSS

<Input and Output Capacitors>

The XC6225 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.

OUTPUT VOLTAGE

0.8V～1.15V

1.2V～1.35V

1.4V～4.0V

4.05V～5.0V

OUTPUT CAPACITOR

CL=4.7μF

CL=2.2μF

CL=1.0μF

CL=2.2μF

<CL Auto-Discharge Function>

XC6225B 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 (refer

to BLOCK DIAGRAM). The CL auto-discharge resistance value is set at 780Ω(VOUT=4.0V @ VIN=6.0V at TYP.). 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) ×e-t / τ or ｔ= τln（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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