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AS3658F-BCTP Datasheet(PDF) 72 Page - ams AG

Part # AS3658F-BCTP
Description  Power and Audio Management Unit for Portable Devices
PDF  158 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3658F-BCTP Datasheet(HTML) 72 Page - ams AG

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AS3658
Data Sheet Confidential - Detail ed Descri ption-Power Management Functions
Figure 28. sdX_dis_curmin=1 operation
1: LX voltage, 2:coil current (1mV=1mA) 3: Vout
High efficiency operation (default setting):
Bit settings:
sdX_dis_curmin=0
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 29. sdX_dis_curmin=0 operation
1: LX voltage, 2:coil current (1mV=1mA) 3: Vout
It’s also possible to switch between these two modes during operation:
For Example:
sdX_dis_curmin=0: System is in idle state. No audio, RF signal. Decreased supply current preferred. Increased ripple
doesn’t affect system performance.
sdX_dis_curmin=1: System is operating. Audio signal on and/or RF signal used. Decreased ripple and noise preferred.
Increased power supply current can be tolerated.



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