Preliminary

! Operational Explanation

Output voltage control with the XC6205 series :

Low ESR Capacitors

Recommended Output Capacitor Values

Current Limiter, Short-Circuit Protection

CE Pin

5

The XC6205 series includes a combination of a fixed current limiter circuit & a foldback circuit which aid the

operations of the current limiter and circuit protection. When the load current reaches the current limit level, the

fixed current limiter circuit operates and output voltage drops. As a result of this drop in output voltage, the foldback

circuit operates, output voltage drops further and output current decreases. When the output pin is shorted, a

current of about 50mA flows. However, when the input/output voltage differential is quite small, this current will be

about 200mA.

XC6205 Series

High Speed LDO Regulators

Low ESR Cap. Compatible, Output On/Off Control

0.9V ~ 1.2V

1.25V ~ 1.75V

With the XC6205 series, a stable output voltage is achievable even if used with low ESR capacitors as a phase

compensation circuit is built-in. In order to ensure the effectiveness of the phase compensation, we suggest that an

output capacitor with a capacitance value as shown in the figure below. Also, please connect an input capacitor

The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6205 series. In shutdown

pin is selectable (please refer to the selection guide on page 2). Note that as the standard XC6205B type is ' High

Active/No Pull Down', operations will become unstable with the CE pin open. Although the CE pin is equal to an

inverter input with CMOS hysteresis, with either the pull-up or pull-down options, the CE pin input current will

input at the CE pin. If this IC is used with the correct specifications for the CE pin, the IC will operate normally.

However, supply current may increase as a result of through current in the IC's internal circuitry.

VOUT

CL

2.2

µF

4.7

µF

Current

Limiter

ON/OFF

Control

Voltage

Reference

each circuit

CE

R2

R1

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

& 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.