ADP2105ACPZ-R7 datasheet(11/32 Pages) AD

11 / 32 page

ADP2105/ADP2106/ADP2107

Rev. 0 | Page 11 of 32

CH1 50mV

CH4 200mAΩ

CH3 2V

M 2µs

A CH3

3.88V

INDUCTOR CURRENT

OUTPUT VOLTAGE (AC-COUPLED)

LX NODE

(SWITCH NODE)

CH1 20mV

17.4%

CH4 1AΩ

CH3 2V

M 1µs

A CH3

3.88V

LX NODE (SWITCH NODE)

OUTPUT VOLTAGE (AC-COUPLED)

INDUCTOR CURRENT

Figure 28. PFM Mode of Operation at Very Light Load (10 mA)

Figure 31. PWM Mode of Operation at Medium/Heavy Load (1.5 A)

CH1 50mV

17.4%

CH4 200mAΩ

CH3 2V

M 400ns

A CH3

3.88V

LX NODE (SWITCH NODE)

OUTPUT VOLTAGE (AC-COUPLED)

INDUCTOR CURRENT

CH1 1V

45%

CH4 1AΩ

CH3 5V

M 4µs

A CH3

1.8V

INDUCTOR CURRENT

OUTPUT VOLTAGE

CHANNEL 3

FREQUENCY

= 336.6kHz

Δ: 2.86A

@: 2.86A

LX NODE (SWITCH NODE)

Figure 29. DCM Mode of Operation at Light Load (100 mA)

Figure 32. Current Limit Behavior of ADP2107 (Frequency Foldback)

CH1 20mV

13.4%

CH4 1AΩ

CH3 2V

M 2µs

A CH3

1.84V

LX NODE (SWITCH NODE)

OUTPUT VOLTAGE (AC-COUPLED)

INDUCTOR CURRENT

CH1 1V

20.2%

CH4 500mAΩ

CH3 5V

M 400µs

A CH1

1.84V

ENABLE VOLTAGE

INDUCTOR CURRENT

OUTPUT VOLTAGE

Figure 30. Minimum Off Time Control at Dropout

Figure 33. Startup and Shutdown Waveform (CSS = 1 nF

→ SS Time = 1 ms)

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