AS3658F-BCTP datasheet(72/158 Pages) AMSCO

tên linh kiện	AS3658F-BCTP

Giải thích chi tiết về linh kiện	Power and Audio Management Unit for Portable Devices

PDF	158 Pages

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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.

AS3658F-BCTP bảng dữ liệu(PDF) 72 Page - ams AG