AS3715 datasheet(53/159 Pages) AMSOSRAM

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Page 52

ams Datasheet

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[v1-03] 2015-Aug-10

AS3715 − Detailed Description – Power Management Functions

Figure 52:

USB Input Selection

Dual Power Path Diagram: Shows the priority of the charger input depending on en_usb2 setting and the

charger input voltages

Parameter

Figure 53:

Charger Parameter

VUSB2 > VBAT+VCHMIN and

VUSB2 > 3.95V

VUSB2 < VBAT+VCHMIN or

VUSB2 < 3.95V

en_usb2=0

VUSB1 > VBAT+VCHMIN and

VUSB1 > 3.95V

Device is powered from VUSB1

VUSB1 < VBAT+VCHMIN or

VUSB1 < 3.95V

No charge

en_usb2=1

VUSB1 > VBAT+VCHMIN and

VUSB1 > 3.95V

Device is powered from VUSB1

VUSB1 < VBAT+VCHMIN or

VUSB1 < 3.95V

Device is powered from VUSB2

No charge

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VCHDET

Charger Detection

threshold

VUSB-VBAT

Hysteresis is > 40mV

105

VCHMIN

020

VSOFT

Apply ISOFT charging

current below that VBAT

voltage

1.8

ISOFT

Charging current if VBAT is

below VSOFT

VTRICKLE

Trickle to CC current

threshold

VBAT rising

2.9

ITRICKLE

Trickle/EOC current limit

Programmable in 60mA steps

60..

240

VCHOFF

Charge termination

threshold

Programmable in 20mV steps

between 3.5 and 4.44V

3.5..

4.44

@ ChVoltEOC=35 (4.2V)

4.15

4.20

4.242

@ ChVoltEOC= 47 (4.34V)

4.29

4.34

4.38

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