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FAN5400 Просмотр технического описания (PDF) - Fairchild Semiconductor

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FAN5400 USB-Compliant Single-Cell Li-Ion Switching Charger with USB-OTG Boost Regulator Fairchild
Fairchild Semiconductor Fairchild
FAN5400 Datasheet PDF : 37 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
Table 3. OREG Bits (OREG[7:2]) vs. Charger VOUT
(VOREG) Float Voltage
Decimal Hex VOREG Decimal Hex VOREG
0
00
3.50
32
20
4.14
1
01
3.52
33
21
4.16
2
02 3.54
34
22
4.18
3
03
3.56
35
23
4.20
4
04
3.58
36
24
4.22
5
05
3.60
37
25
4.24
6
06
3.62
38
26
4.26
7
07
3.64
39
27
4.28
8
08
3.66
40
28
4.30
9
09
3.68
41
29
4.32
10
0A 3.70
42
2A 4.34
11
0B 3.72
43
2B 4.36
12
0C 3.74
44
2C 4.38
13
0D 3.76
45
2D 4.40
14
0E 3.78
46
2E 4.42
15
0F 3.80
47
2F 4.44
16
10
3.82
48
30
4.44
17
11
3.84
49
31
4.44
18
12
3.86
50
32
4.44
19
13
3.88
51
33
4.44
20
14
3.90
52
34
4.44
21
15
3.92
53
35
4.44
22
16
3.94
54
36
4.44
23
17
3.96
55
37
4.44
24
18
3.98
56
38
4.44
25
19
4.00
57
39
4.44
26
1A 4.02
58
3A 4.44
27
1B 4.04
59
3B 4.44
28
1C 4.06
60
3C 4.44
29
1D 4.08
61
3D 4.44
30
1E 4.10
62
3E 4.44
The following charging parameters can be programmed by
the host through I2C:
Table 4. Programmable Charging Parameters
Parameter
Output Voltage Regulation
Battery Charging Current Limit
Input Current Limit
Charge Termination Limit
Weak Battery Voltage
Name
VOREG
IOCHRG
IINLIM
ITERM
VLOWV
Register
REG2[7:2]
REG4[6:4]
REG1[7:6]
REG4[2:0]
REG1[5:4]
A new charge cycle begins when one of the following occurs:
The battery voltage falls below VOREG - VRCH
VBUS Power On Reset (POR) clears and the battery
voltage is below the weak battery threshold (VLOWV).
This occurs for all versions except the FAN5401.
CE or HZ_MODE is reset through I2C write to
CONTROL1 (R1) register.
Charge Current Limit (IOCHARGE)
Table 5. IOCHARGE (REG4 [6:4]) Current as Function
of IOCHARGE Bits and RSENSE Resistor Values
DEC
BIN
HEX
VRSENSE IOCHARGE (mA)
(mV) 68m100m
0
000
00
37.4
550
374
1
001
01
44.2
650
442
2
010
02
51.0
750
510
3
011
03
57.8
850
578
4
100
04
64.6
950
646
5
101
05
71.4
1050
714
6
110
06
78.2
1150
782
7
111
07
85.0
1250
850
Termination Current Limit
Current charge termination is enabled when TE (REG1[3])=1.
Typical termination current values are given in Table 6.
Table 6. ITERM Current as Function of ITERM Bits
(REG4[2:0]) and RSENSE Resistor Values
FAN5400 - FAN5402 FAN5403 - FAN5405
ITERM
0
1
2
3
4
5
6
7
VRSENSE ITERM (mA) VRSENSE ITERM (mA)
(mV) 68m100m(mV) 68m100m
3.4
50
34
3.3
49
33
6.8 100 68
10.2 150 102
6.6
97
66
9.9 146 99
13.6 200 136
17.0 250 170
13.2 194 132
16.5 243 165
20.4 300 204
23.8 350 238
19.8 291 198
23.1 340 231
27.2 400 272 26.4 388 264
When the charge current falls below ITERM, PWM charging
stops and the STAT bits change to READY (00) for about
500ms while the IC determines whether the battery and
charging source are still connected. STAT then changes to
CHARGE DONE (10), provided the battery and charger are
still connected.
© 2009 Fairchild Semiconductor Corporation
FAN5400 Family • Rev. 1.0.7
18
www.fairchildsemi.com
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