9/32

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

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.

<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

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

below, the mode changes automatically to the PS mode after the delay time of hundreds

μs, 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, according to the system condition. Furthermore, the high-speed operation might be required. In such a case,

the mode will automatically switch to the HS mode at the automatic switching mode (GO mode), when the output current

than the PS mode. Automatic switching PS mode to HS mode causes the switching delay time of tens of

μs, the output

voltage drops more than in the fixed HS mode. If the GO pin voltage is at high level (tens of

μs (ΔT) 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 the IC is

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

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.