XC6229 데이터 시트보기 (PDF) - TOREX SEMICONDUCTOR

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XC6229

300mA Ultra Small High Speed LDO Regulator, Built-in Inrush Current Protection

TOREX SEMICONDUCTOR 

■ OPERATIONAL EXPLANATION

XC6229

Series

XC6229 Series, Type D

XC6229 Series, Type H

The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The P-channel

MOSFET which is 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 operate in relation to the level of output

current and heat dissipation. Further, the IC’s internal circuitry can be shutdown via the CE pin signal.

<Low ESR Capacitor>

The XC6229 series needs an output capacitor CL for phase compensation. Please place an output capacitor (CL) at the output pin

(VOUT) and the ground pin (VSS) as close as possible. Please use the output capacitor (CL) is 1.0μF or larger. For a stable power input,

please connect an input capacitor (CIN) of 1.0μF between the VIN pin and the VSS pin.

<Current Limiter, Short-Circuit Protection>

The XC6229 has current limiter and droop shape of fold-back circuit. When the load current reaches the current limit, the droop current

limiter circuit operates and the output voltage drops. When the output voltage dropped, the fold-back circuit operates and the output current

goes to decrease. The output current finally falls at the level of 50mA when the output pin is short-circuited.

<CE Pin>

The IC's internal circuitry can be shutdown via the signal from the CE pin. In shutdown mode, the XC6229 series enables the electric

charge at the output capacitor (CL) to be discharged via the internal switch located between the VOUT and VSS pins, and as a result the VOUT

pin quickly returns to the VSS level. The XC6229 series has a pull-down resistor at the CE pin inside, so that the CE pin input current flows.

<Thermal Shutdown>

When the junction temperature of the built-in driver transistor reaches the temperature limit, the thermal shutdown circuit operates and the

driver transistor will be set to 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 the thermal shutdown release voltage.

<Inrush Current Protection>

The inrush current protection circuit is built in the XC6229 type H.

When the IC starts to operate, the protection circuit limits the inrush current from input pin (VIN) to output pin (VOUT) to charge CL capacitor.

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