ADP5300ACPZ-2-R7 datasheet(16/21 Pages) AD

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ADP5300

Data Sheet

Rev. 0 | Page 16 of 21

STOP SWITCHING

The ADP5300 includes a stop input pin (STOP) that can

temporarily stop the regulator switching in hysteresis mode.

When a logic high level is applied to the STOP pin, the buck

regulator is forced to stop switching immediately. When a logic

low level is applied to the STOP pin, the buck regulator resumes

switching. Note that tens of nanoseconds delay time exists from

when the STOP signal goes high to fully stop switching.

In some battery-powered systems, the microcontroller unit

(MCU) can command the regulator to stop switching via the

STOP signal, and the regulator then relies on the output

capacitor to supply the load. In this period, a quiet system

environment can be achieved which benefits the noise sensitive

circuitry, such as data conversion, RF data transmission, and

analog sensing. After the noise sensitive circuitry completes its

task, the MCU can control the regulator and resume switching

regulation mode. If needed, the VOUTOK signal can monitor

the output voltage in the event it dips too low to latch up the

system. Figure 40 shows the STOP switching operation status in

ADP5300.

When the regulator is enabled with EN pin pulled high, the

STOP signal control is valid, and when EN pin is logic low, the

STOP signal is ignored.

DC TO DC OUTPUT

OUTPUT LOAD

DC TO DC SWITCHING

STOP SIGNAL

2µA

2.500V

2.540V

2.175V TO VOUTOK THRESHOLD

VOUTOK FLAG

10ms OF mA

Figure 40. STOP Switching Operation Status

THERMAL SHUTDOWN

If the ADP5300 junction temperature exceeds 142°C, the thermal

shutdown circuit turns off the IC except for the internal linear

regulator. Extreme junction temperatures can be the result of

high current operation, poor circuit board design, or high ambient

temperature. A 15°C hysteresis is included so that the ADP5300

does not return to operation after thermal shutdown until the

junction temperature falls below 127°C. When the device exits

thermal shutdown, a soft start initiates for each enabled channel.

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