AS3658 datasheet(45/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Detail ed Descri ption-Power Management Functions

8.7

External Step Down/Linear Charger

The inductive dcdc step down charger (or the external linear charger) converts the input voltage from VCHARGER to

VSUPPLY. The system (DCDC converters, LDOs…) are connected directly to VSUPPLY; the ideal diode and the internal

battery switch SINT (together with the external battery switch MBATSW) connect VSUPPLY to VBAT to allow charging of

the battery.

Figure 14. Step Down Charger Application Diagram with optional reverse polarity and short protection

If the input voltage can be up to 50V additional three transistors and a simple voltage regulator with a zener diode are

required. These circuit ‘isolates’ the AS3658 from the high input voltage and keep the pins VCHARGER, VOFF_B and

VGATE within its operating limits (<15V). The actual circuit is shown in the following figure:

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