MAX8845Y Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8845Y
Maxim Integrated
MAX8845Y Datasheet PDF : 19 Pages
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28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
Typical Operating Characteristics (continued)
(VIN = 5V, VBATT = 4V, RPOK = RCHG = 200kΩ to 5V, EN = unconnected, RSETI = 2.8kΩ to GND, RMIN = 1.74kΩ to GND, RDETBAT =
4.7kΩ to GND, CBATT = 2.2µF, TA = +25°C, unless otherwise noted.)
BATTERY REGULATION ACCURACY
vs. AMBIENT TEMPERATURE
1.0
0.8
IBATT = 0
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-40 -15
10
35
60
85
AMBIENT TEMPERATURE (°C)
FAST-CHARGE CURRENT
vs. RSETI
1000
100
10
1
1
10
100
1000 10,000
RSETI (kΩ)
TOP-OFF CURRENT THRESHOLD
vs. 1/RMIN (kΩ)
600
550
500
450
TOP-OFF CURRENT RISING
400
350
300
250
200
150
TOP-OFF CURRENT FALLING
100
50
0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9
1/RMIN (kΩ)
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
700
600
VBATT = 4V
500
400
VBATT = 3.2V
300
200
100
0
-40
RSETI = 2.8kΩ
-20 0 20 40 60 80 100
AMBIENT TEMPERATURE (°C)
AUTOBOOT ENABLED BY ABI SIGNAL
(MAX8845Z)
MAX8845Z/Y/X/W toc14
VABI
VIN
VBATT
VABO
4µs/div
5V/div
0
5V/div
0
5V/div
0
5V/div
0
AUTOBOOT ENABLED BY INPUT VOLTAGE
(MAX8845Z)
MAX8845Z/Y/X/W toc15
VABI
VIN
VBATT
VABO
5V/div
0
5V/div
0
5V/div
0
5V/div
0
20µs/div
AUTOBOOT ENABLED BY ABI SIGNAL
(MAX8845Y/MAX8845X/MAX8845W)
MAX8845Z/Y/X/W toc16
5V/div
VABI
0
5V/div
VIN
0
VBATT
VABO
4µs/div
5V/div
0
5V/div
0
_______________________________________________________________________________________ 5
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