MAX8900A(2010) Ver la hoja de datos (PDF) - Maxim Integrated
Número de pieza
componentes Descripción
Fabricante
MAX8900A
(Rev.:2010)
(Rev.:2010)
Maxim Integrated
MAX8900A Datasheet PDF : 35 Pages
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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.)
THM NORMAL TO COLD CURRENT
FOLDBACK (T2) TO COLD SHUTOFF (T1)
MAX8900A toc16
60% OF AVL (T2)
VTHM
VBAT
74.5% OF AVL (T1)
3.6V
1V/div
2V/div
1200mA (T2 < T < T3)
IBAT
600mA
20ms/div
0V
200mA/div
0mA
0A
VCEN
CHARGER ENABLE
MAX8900A toc18
5V/div
VPVL
5V/div
VLX
5V/div
1.2A
IBAT
1A/div
0A
400µs/div
THM NORMAL TO HOT VOLTAGE FOLDBACK
(T3) TO HOT SHUTOFF (T4) THRESHOLD
MAX8900A toc17
34.7% OF AVL (T3)
VTHM
2V/div
4.2V
4.075V
22.5% OF AVL (T4)
VBAT
10I RESISTOR LOAD
IBAT
20ms/div
0V
2V/div
200mA/div
0A
EFFICIENCY vs. BATTERY VOLTAGE
(CONSTANT-CURRENT MODE)
85
83 VIN = 5.0V
81
79
77
75
73
IBAT = 100mA
71
69
67
65
2.5
3.0
3.5
4.0
4.5
VBAT (V)
EFFICIENCY vs. BATTERY VOLTAGE
(CONSTANT-CURRENT MODE)
95
VIN = 5.0V
90
85
80
75
70
IBAT = 500mA
IBAT = 800mA
IBAT = 1200mA
65
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
VBAT (V)
EFFICIENCY vs. CHARGE CURRENT
(CONSTANT-CURRENT MODE)
95
VIN = 5.0V
VBAT = 4.0V
90
85
80
VBAT = 3.0V VBAT = 3.6V
75
70
65
0
0.5
1.0
1.5
IBAT (A)
EFFICIENCY vs. BATTERY VOLTAGE
(CONSTANT-CURRENT MODE, IBAT = 1200mA)
95
IBAT = 1200mA, RSETI = 2.87kI
90
85
80
75
VIN = 5V
VIN = 8V
70
VIN = 7V
VIN = 6V
VIN = 8.5V
65
2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
VBAT (V)
10
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