ADP2371ACPZ-1.2-R7 datasheet(24/32 Pages) AD

24 / 32 page

ADP2370/ADP2371

Data Sheet

Rev. A | Page 24 of 32

M2.00µs A CH2

–57.0mV

20.0%

CH1 5.00V BW

CH3 200mA

Ω BW CH4 5.00V

CH2 50.0mV

VOUT

INDUCTOR CURRENT

SYNC

Figure 79. SYNC Transient 800 kHz to 1.2 MHz

POWER GOOD

The ADP2370/ADP2371 power-good (PG) output indicates the

state of the monitored output voltage. The PG function is an active

high, open-drain output, requiring an external pull-up resistor that

is typically supplied from the I/O supply rail, as shown in Figure 1.

When the sensed output voltage is below 87% of its nominal value,

the PG pin is held low. When the sensed output voltage rises above

92% of the nominal level, the PG line is pulled high after tRESET.

The PG pin remains high when the sensed output voltage is

above 92% of the nominal output voltage level.

The typical PG delay when the buck is in PWM mode is 20 μs.

Figure 80 shows the typical PG operation during startup. Figure 81

shows the PG operation when there is a large load transient that

causes the output voltage to fall just below the PG threshold.

When not using the PG function, remove the pull-up resistor

and leave the PG pin either open or shorted to ground.

M40.0µs

A CH3

3.40V

10.00%

CH1 500mV BW

CH3 5.00V BW

CH2 1.00V BW

VOUT

ENABLE

Figure 80. Typical PG Timing at Startup

M1.00µs

A CH3

740mA

10.00%

CH1 500mV

CH3

500mAΩ BW

CH2 1.00V BW

VOUT

LOAD CURRENT

Figure 81. Typical PG Timing with 200 mA to 1100 mA Load Transient

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