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PDF MAX8900AEWV Data sheet ( Hoja de datos )
| Número de pieza | MAX8900AEWV | |
| Descripción | 1.2A Switch-Mode Li+ Chargers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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EVALUATION KIT AVAILABLE
MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
General Description
The MAX8900_ is a high-frequency, switch-mode char-
ger for a 1-cell lithium ion (Li+) or lithium polymer
(Li-Poly) battery. It delivers up to 1.2A of current to the
battery from 3.4V to 6.3V (MAX8900A/MAX8900C) or
3.4V to 8.7V (MAX8900B). The 3.25MHz switch-mode
charger is ideally suited to small portable devices such
as headsets and ultra-portable media players because it
minimizes component size and heat.
Several features make the MAX8900_ perfect for high-
reliability systems. The MAX8900_ is protected against
input voltages as high as +22V and as low as -22V.
Battery protection features include low voltage prequali-
fication, charge fault timer, die temperature monitoring,
and battery temperature monitoring. The battery temper-
ature monitoring adjusts the charge current and termina-
tion voltage as described in the JEITA* specification for
safe use of secondary lithium-ion batteries.
Charge parameters are easily adjustable with external
components. An external resistance adjusts the charge
current from 50mA to 1200mA. Another external resis-
tance adjusts the prequalification and done current
thresholds from 10mA to 200mA. The done current thresh-
old is very accurate achieving Q1mA at the 10mA level.
The charge timer is adjustable with an external capacitor.
The MAX8900_ is available in a 0.4mm pitch, 2.44mm x
2.67mm x 0.64mm WLP package.
USB Charging
Headsets and Media
Players
Smartphones
Applications
Digital Cameras
GPS, PND
eBook
Ordering Information (continued)
PART
TEMP PIN-
RANGE PACKAGE
OPTIONS
MAX8900AEWV+T
-40NC to
+85NC
30 WLP
VOVLO = 6.5V
T1 = 0NC
2-pin status indicators
VPQUTH = 2.8V
Features
S 3.25MHz Switching Li+/Li-Poly Battery Charger
S JEITA Battery Temperature Monitor Adjusts
Charge Current and Termination Voltage
S 4.2V ±0.5% Battery Regulation Voltage (Alternate
4.1V Target Available on Request)
S Adjustable Done Current Threshold
Adjustable from 10mA to 200mA
±1mA Accuracy at 10mA
S High-Efficiency and Low Heat
S Uses a 2.0mm x 1.6mm Inductor
S Positive and Negative Input Voltage Protection
(±22V)
S Up to +20V Operating Range (Alternate OVLO
Ranges Available on Request)
S Supports No-Battery Operation
S Fault Timer
S Charge Status Outputs
S 2.44mm x 2.67mm x 0.64mm Package
Simplified Applications Circuit
1FH
BST CS
VIN
(-22V TO +22V) 0.47FF
25V
0603
OFF
ON
LX
IN
MAX8900_
STAT1
STAT2
STAT3
CEN
BAT
PGND
AVL
GND
THM
1.0FF
6.3V
0402
PVL
INBP
0.47FF
25V
CT SETI DNI
0603
2.2FF
6.3V
0603
T
SYSTEM
LOAD
Li+/
Li-POLY
MAX8900BEWV+T
-40NC to
+85NC
30 WLP
VOVLO = 9.0V
T1 = -15NC
3-pin status indicators
VPQUTH = 2.8V
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information continued at end of data sheet.
*JEITA (Japan Electronics and Information Technology
Industries Association) standard, “A Guide to the Safe Use
of Secondary Lithium Ion Batteries in Notebook-type Personal
Computers” April 20, 2007.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5063; Rev 3; 1/11
1 page  
MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 6V, VBAT = 4V, RSETI = 2.87kI, RDNI = 3.57kI, VTHM = VAVL/2, circuit of Figure 1, TA = -40NC to +85NC, unless otherwise
noted. Typical values are at TA = +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Minimum On-Time
Maximum On-Time
Minimum Off-Time
tON-MIN
tON-MAX
tOFF
90 ns
9 Fs
75 ns
BAT Regulation Voltage (Note 3)
VBATREG
IBAT = 0mA,
MAX8900A/
MAX8900B/
MAX8900C
(Figure 10)
TA = +25NC, VTHM between
T1 and T3
TA = -40NC to +85NC, VTHM
between T1 and T3
TA = +25NC, VTHM between
T3 and T4 (Note 5)
TA = -40NC to +85NC, VTHM
between T3 and T4 (Note 5)
4.179
4.158
4.055
4.034
4.200
4.200
4.075
4.075
4.221
4.242
4.095
4.100
V
Charger Restart Threshold
(Note 6)
VRSTRT
VTHM between T1 and T3
VTHM between T3 and T4
-70 -100 -125
-75
mV
BAT Prequalification Lower
Threshold (Figure 6)
VPQLTH VBAT rising,180mV hysteresis
2.1 V
BAT Prequalification Upper
Threshold (Figure 6) (Note 3)
VPQUTH
VBAT rising, 180mV MAX8900A/MAX8900B
typical hysteresis MAX8900C
2.7
2.9
2.8
3.0
2.9
3.1
V
Fast-Charge Current
VTHM between T2
and T4 (Figure 10)
RSETI = 2.87kI
RSETI = 6.81kI
1166
490
1190
500
1214
510
mA
IFC
RSETI = 34.0kI
99 101 103
VTHM between T1 and T2 (Figure 10); the
fast-charge current is reduced to 50% the
50
%
value programmed by RSETI
Fast-Charge Current Set Range
(Figure 5)
Minimum
Maximum
50
1200
mA
Fast-Charge Setting Resistor
Range
RSETI (Figure 5)
Minimum
Maximum
2.87
68.1
kI
Done Current
Prequalification Current
VTHM between T2
and T4 (Figure 10)
RDNI = 3.83kI
RDNI = 7.68kI
(Note 5)
(Note 5)
93
47
IDN
RDNI = 38.3kI
9.5
VTHM between T1 and T2 (Figure 10); the
done current threshold is reduced to 50%
the value programmed by RDNI
VTHM between T2 RDNI = 3.83kI (Note 5) 95
and T4 (Figure 10), RDNI = 7.68kI (Note 5) 49
IPQ VBAT = 2.6V
RDNI = 38.3kI (Note 5) 10
VTHM between T1 and T2 (Figure 10); the
prequalification current is reduced to 50%
the value programmed by RDNI
99
50
10.5
50
105
54
11.5
50
105
53
11.5
115
59
13
mA
%
mA
%
Maxim Integrated
5
5 Page 
MAX8900A/MAX8900B/MAX8900C
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 6V, VBAT = 3.6V, TA = +25NC, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
(CONSTANT-CURRENT MODE)
90
IBAT = 1200mA, RSETI = 2.87kI
88
86
VBAT = 4.0V
84
EFFICIENCY vs. CHARGE CURRENT
(CONSTANT-VOLTAGE MODE)
100
VIN = 5V, VBAT = 4.2V
95
90
BATTERY + LX LEAKAGE CURRENT
vs. INPUT VOLTAGE
1000
CEN = 1
VBAT = 4.0V
VBAT = 3.2V
82 VBAT = 3.6V
80
78
76 VBAT = 3.0V
74
5 6 7 8 9 10
VIN (V)
85
80
75
70
0
100
500 1000
IBAT (A)
10
1500 0 1 2 3 4 5
INPUT VOLTAGE (V)
BATTERY + LX LEAKAGE CURRENT
vs. BATTERY VOLTAGE
50
45
IN UNCONNECTED
STAT INDICATOR CURRENT
40 NOT INCLUDED
35
30
25
20
15
10
5
0
0123456
BATTERY VOLTAGE (V)
BATTERY + LX LEAKAGE CURRENT
vs. AMBIENT TEMPERATURE
60
IN UNCONNECTED
50
STAT INDICATOR CURRENT
NOT INCLUDED
40
30
20
10
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
AVL VOLTAGE vs. INPUT VOLTAGE
6
5
4 VOVLO
3
2
MAX8900x
VOVLO = 28V
VCEN = 0V
1 VBAT = 3.6V
RSETI = 2.87kI
0
0 5 10 15 20 25 30
VIN (V)
MAX8900_ CHARGE PROFILE
(CONSTANT-CURRENT TO DONE MODES)
4.3 1.4MAX8900A toc29
MAX8900_ CHARGE PROFILE
(CHARGER RESTART)
4.3 1.4MAX8900A toc30
4.2 CC
CV DONE 1.2
4.2 DONE
CV DONE 1.2
4.1
VBAT 1.0
4.1
4.0 0.8 4.0
1.0
VBAT
0.8
3.9 VIN = 5V
3.8
RSETI = 4.02kI
RDNI = 3.57kI
IBAT
CCT = 0.47µF
3.7 1300mAh BATTERY
IIN
3.6
500 2500 4500 6500 8500
TIME (s)
0.6
0.4
0.2
0
10,500
Maxim Integrated
3.9
3.8
3.7
3.6
0
VIN = 5V
RSETI = 4.02kI
RDNI = 3.57kI
CCT = 0.47µF
1300mAh BATTERY
IIN
IBAT
2000 4000 6000 8000
TIME (s)
0.6
0.4
0.2
0
10,000
11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX8900AEWV.PDF ] | |
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