XC6211(2003) Просмотр технического описания (PDF) - TOREX SEMICONDUCTOR

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XC6211
(Rev.:2003)

High Speed LDO Regulator

TOREX SEMICONDUCTOR 

XC6211 Series

Preliminary

High Speed LDO Regulator

Low ESR Cap. Compatible, On / Off Switch

„ Operational Explanation

Output voltage control with the XC6211 series:

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 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.

CE

ON/OFF

Control

each circuit

Current

Limit

R2

R1

Voltage

Reference

VIN

VOUT

VSS

Low ESR Capacitors

With the XC6211 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 (CL) is connected as close as possible to the output pin (VOUT) and the VSS pin. Please use an

output capacitor with a capacitance value of at least 1µF. Also, please connect an input capacitor (CIN) of 0.1µF

between the VIN pin and the VSS pin in order to ensure a stable power input.

Current Limiter, Short-Circuit Protection

The XC6211 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.

CE Pin

The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6211 series. In shutdown

mode, output at the VOUT pin will be pulled down to the VSS level via R1 & R2. The operational logic of the IC's CE

pin is selectable (please refer to the selection guide on page 3). Note that as the standard XC6211B type's

regulator 1 and 2 are both ' 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 increase when the IC is in operation. We suggest that you use this IC with either a VIN

voltage or a VSS voltage input at the CE pin. If this IC is used with the correct specifications for the CE pin, the

operational logic is fixed and the IC will operate normally. However, supply current may increase as a result of

through current in the IC's internal circuitry.

„ Notes on Use

1 Please use this IC within the stated absolute maximum ratings.

The IC is liable to malfunction should the ratings be exceeded.

2 Where wiring impedance is high, operations may become unstable due to noise and/or phase lag

depending on output current. Please keep the resistance low between VIN and VSS wiring in particular.

3 Please wire the input capacitor (CIN) and the output capacitor (CL) as close to the IC as possible.

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