Nokia RM-497 - Page 137

Table 10 USB switch mode charger
Symbol Parameter CONDITION Min Type Max Unit
VBUS USB Input
Operating
Range
ICHARGE =
100mA max,
VMBAT ≤
4.15V
4.35 5 5.5 V
ICHARGE =
500mA max,
VMBAT ≤
4.15V
4.75 5 5.5 V
VBUS
current
80mA
setting,
VMBAT <
4.2V, VBUS <
5.5V,
assuming
trim 1.5mA
LSB
73 85 95 mA
450mA
setting,
VMBAT<4.2V
, VBUS <
5.5V, quick
charge
enabled
407 450 494
η USB
Charging
Efficiency
ICHARGE =
80mA,
75 80 85 %
inductor DCR
= 100mΩ
ICHARGE =
450mA,
85 90 - %
inductor DCR
= 100mΩ
USB Charger
Insertion
Detection
Rising
Threshold
3.686 3.8 3.914 V
RM-497
System Module
Issue 1 COMPANY CONFIDENTIAL Page 5 – 23
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