ams Datasheet

Page 9

[v1-04] 2015-Jun-19

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AS1382 − Detailed Description

High-Efficiency Operation

MODE pin = low

In this mode there is a minimum coil current necessary before

switching OFF the PMOS. As result there are less pulses at low

output load necessary, and therefore the efficiency at low

output load is increased. This results in higher ripple, and noisy

pulse skip operation up to a higher output current.

Figure 11:

AS1382 High Efficiency Mode

DC/DC Buck Burst Mode: Shows the DC/DC switching waveforms for high efficiency operation

It is also possible to switch between these two modes during

operation.

For Example:

MODE pin = low: System is in idle state. No audio, RF signal.

Decreased supply current preferred. Increased ripple doesn’t

affect system performance.

MODE pin = high: System is operating. Audio signal on and/or

RF signal used. Decreased ripple and noise preferred. Increased

power supply current can be tolerated.

VOUT (50mV/div)

LX (2V/div)

coil current (200mA/div)

time (20us/div)