MAX8900A MAXIM [Maxim Integrated Products], MAX8900A Datasheet - Page 10

• Manufacturer Part Number: MAX8900A
• Manufacturer: MAXIM [Maxim Integrated Products]

(Circuit of Figure 1, V
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
10
95
90
85
80
75
70
65
2.5
EFFICIENCY vs. BATTERY VOLTAGE
V
2.7
IN
(CONSTANT-CURRENT MODE)
= 5.0V
2.9
V
V
V
V
THM
I
I
BAT
BAT
CEN
V
BAT
PVL
LX
3.1
FOLDBACK (T2) TO COLD SHUTOFF (T1)
3.3
1200mA (T2 < T < T3)
IN
60% OF AVL (T2)
V
THM NORMAL TO COLD CURRENT
BAT
= 6V, V
3.5
(V)
3.7
CHARGER ENABLE
I
I
I
BAT
BAT
BAT
3.9
BAT
= 500mA
= 800mA
= 1200mA
20ms/div
400µs/div
4.1
= 3.6V, T
4.3
600mA
74.5% OF AVL (T1)
3.6V
4.5
1.2A
A
MAX8900A toc16
MAX8900A toc18
= +25NC, unless otherwise noted.)
0mA
Typical Operating Characteristics (continued)
95
90
85
80
75
70
65
0
1V/div
2V/div
0V
200mA/div
0A
5V/div
5V/div
5V/div
1A/div
0A
V
EFFICIENCY vs. CHARGE CURRENT
IN
= 5.0V
(CONSTANT-CURRENT MODE)
V
BAT
0.5
= 3.0V
I
BAT
(A)
V
V
BAT
BAT
V
V
1.0
THM
I
= 3.6V
BAT
BAT
= 4.0V
85
83
81
79
77
75
73
71
69
67
65
THM NORMAL TO HOT VOLTAGE FOLDBACK
2.5
(T3) TO HOT SHUTOFF (T4) THRESHOLD
10I RESISTOR LOAD
EFFICIENCY vs. BATTERY VOLTAGE
V
4.2V
IN
(CONSTANT-CURRENT MODE)
= 5.0V
1.5
3.0
4.075V
20ms/div
V
BAT
3.5
95
90
85
80
75
70
65
(CONSTANT-CURRENT MODE, I
I
BAT
(V)
34.7% OF AVL (T3)
2.5
22.5% OF AVL (T4)
= 100mA
I
EFFICIENCY vs. BATTERY VOLTAGE
BAT
2.7
= 1200mA, R
4.0
2.9
MAX8900A toc17
0V
3.1
3.3
4.5
SETI
V
BAT
2V/div
2V/div
200mA/div
0A
3.5
= 2.87kI
(V)
3.7
3.9
BAT
V
V
V
V
V
IN
IN
IN
IN
IN
4.1
= 1200mA)
= 5V
= 8V
= 7V
= 6V
= 8.5V
4.3
4.5