XC6207B Ver la hoja de datos (PDF) - TOREX SEMICONDUCTOR

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XC6207B

High Speed Green Operation LDO Voltage Regulators

TOREX SEMICONDUCTOR 

XC6207

Series

■OPERATIONAL EXPLANATION

<Output Voltage Control>

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 & stabilized by a system of negative feedback. The current limit circuit and short

protect circuit operate in relation to the level of output current. The GO function monitors the output current and switches a

supply current to two values according to the level of output current. Further, the IC's internal circuitry can be shutdown via

the CE pin's signal.

ON/OFF

CE

Control

CE /CE

each circuit

GO

- Error

Amp

+

Current

Limit

Green

Operation

R1

VIN

VOUT

Voltage

Reference

R2

VSS

<Green Operation>

XC6207 series can be set as a fixed high-speed mode or a green operation (GO) mode via a signal to the green operation

(GO) pin. Under the condition that the output current becomes IGOR or less, the IC operates in the fixed high-speed mode

when the GO pin is at high level and the IC operates in the power save (PS) mode when the GO pin is at low level. The

GO mode enables the IC to switch automatically the supply current to the high speed (HS) mode or the power save (PS)

mode according to the level of output current. While having both high-speed operation and low supply current state, the

XC6207 series can acquire high efficiency. At the HS/PS automatic switching mode (GO mode), the switching point of the

HS mode and the PS mode is being fixed inside the IC. When the output current becomes IGOR 0.3mA (TYP.) or below,

the mode changes automatically to the PS mode after the delay time of hundreds µsec(s), and it can reduce supply current

in light load. For applications, most of portable equipment control the system current, which is the output current to the IC,

and control the supply current according to the system condition. Furthermore, the high-speed operation might be

required. In such a case, at the automatic switching mode (GO mode), when the output current becomes IGO or more,

the mode will automatically switch to the HS mode. In the HS mode, the response of the output voltage during the output

current fluctuation is better than the PS mode. Automatic switching PS mode to HS mode causes the switching delay

time of tens of µsec(s), the output voltage drops more than in the fixed HS mode. If the GO pin voltage is at high level {tens

of µsec(s) before the output current fluctuation occurs} and the IC is used in the HS mode, the output current fluctuation

will be suppressed to as low as the fixed HS mode. (cf. the following item: Load Transient Response by Switching Mode

with GO pin.)

The output current at the HS/PS mode should be adjusted to 2.0mA or more / 0.3mA or less respectively when you use the

IC in the HS/PS automatic switching mode (GO mode).

It is suggested that you use this IC with either a VIN voltage or a VSS voltage input at the GO pin. If this IC is used with the

correct specifications for the GO pin, the IC will operate normally. However, supply current may increase as a result of

through current in the IC's internal circuitry when medium voltage is input.

Data Sheet

ud200527

11

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