LG KE600 Service Manual - Page 51

USB charging circuit

Get LG KE600 - LG Cell Phone PDF manuals and user guides View all LG KE600 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 51 highlights

3. TECHNICAL BRIEF 3.14. USB charging circuit The USB charging circuit is a fully integrated USB VBUS voltage single-cell Li-ion battery charger circuit. The charger uses a CC/CV charge profile required by Li-ion batteries. CC charging current and End of charging current is programmable IREF & IMIN resistors. IREF resistor between this pin and the GND pin to set the charge current limit determined by the following equation: ICC = 12089/33K = 366mA The End Of Charging current is set by IMIN That can be programmed by the as following equation: IEOC = 11000/220K = 50mA USB_EOCn 2V72_IO R250 10K VBUS_USB R221 0 USB_CHG_ENn R216 0 U205 ISL6294 TP217 R251 C242 NA 1u 1 VIN 2 _PPR 3 _CHG 4 9 _EN PGND BAT 8 IREF 7 6 IMIN 5 GND VBAT C243 1u R218 220K R219 33K Figure 26 USB charging circuit - 52 -

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
3. TECHNICAL BRIEF
- 52 -
3.14. USB charging circuit
The USB charging circuit is a fully integrated USB VBUS voltage single-cell Li-ion battery charger
circuit. The charger uses a CC/CV charge profile required by Li-ion batteries. CC charging current and
End of charging current is programmable I
REF
& IMIN resistors.
I
REF
resistor between this pin and the GND pin to set the charge current limit determined by the
following equation:
I
CC
= 12089/33K = 366mA
The End Of Charging current is set by I
MIN
That can be programmed by the as following equation:
I
EOC
= 11000/220K = 50mA
2V72_IO
VBAT
2
R218
220K
U205
ISL6294
BAT
8
GND
5
6
IMIN
7
IREF
PGND
9
1
VIN
_CHG
3
4
_EN
_PPR
0
R221
10K
R250
1u
C243
R219
33K
R251
NA
0
R216
TP217
C242
1u
USB_CHG_ENn
USB_EOCn
VBUS_USB
Figure 26 USB charging circuit