ADP5302

Data Sheet

Rev. B | Page 16 of 22

STOP SWITCHING

The ADP5302 includes the STOP input pin, allowing the user to

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 the switching immediately. When a

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

resumes the switching. Note that a delay time in tens of nano-

seconds exists from when the STOP signal goes high to when

the signal fully stops switching.

In some battery-powered systems, the microcontroller unit (MCU)

commands the regulator to stop switching via the STOP signal.

Then, the regulator relies on the output capacitor to supply the

load. In this period, a quiet system environment can be achieved to

benefit noise sensitive circuitry, such as data conversion, RF data

transmission, and analog sensors. After the noise sensitive circuitry

completes its task, the MCU controls the regulator as it resumes

the switching regulation mode.

Figure 40 shows the STOP switching functionality in ADP5302.

The STOP signal control is valid only when the regulator is

enabled with the EN pin pulled high. Otherwise, the STOP

signal is ignored if the EN pin is logic low.

DC TO DC OUTPUT

OUTPUT LOAD

DC TO DC SWITCHING

STOP SIGNAL

2µA

2.50V

2.54V

10ms OF mA

Figure 40. STOP Switching Operation Status

THERMAL SHUTDOWN

If the ADP5302 junction temperature exceeds 142°C, the thermal

shutdown circuit turns off the IC except for the internal linear

regulator. Extreme junction temperatures may be the result of

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

temperature. A 15°C hysteresis is included so that the ADP5302

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 is initiated for each enabled channel.