MAX8731A Maxim Integrated Products, MAX8731A Datasheet - Page 11

• Manufacturer Part Number: MAX8731A
• Description: SMBus Level 2 Battery Charger
• Manufacturer: Maxim Integrated Products

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(Circuit of Figure 1, adapter = 19.5V, ChargeVoltage() = 16.8V, ChargeCurrent() = 3.854A, InputCurrent() = 3.584A, T
unless otherwise noted.)
-0.2
-0.4
-0.6
100
______________________________________________________________________________________
0.6
0.4
0.2
0.0
95
90
85
80
75
70
65
60
4
0
EFFICIENCY vs. CHARGE CURRENT
vs. CHARGE-VOLTAGE SETTING
V
OUT
2 CELLS
CHARGE-VOLTAGE ERROR
CHARGE-VOLTAGE SETTING (V)
OUTPUT CAPACITOR = 22μF
8
2
BATTERY REMOVAL
V
CHARGE CURRENT (A)
OUT
SMBus Level 2 Battery Charger
3 CELLS
OUTPUT CAPACITOR = 10μF
20μs/div
12
ChargeVoltage( ) = 12.6V
4
4 CELLS
16
Typical Operating Characteristics (continued)
6
MAX8731A toc12
20
8
13.5V
13.0V
12.5V
CCS VOLTAGE
CCI VOLTAGE
INDUCTOR
500mV/div
500mV/div
CURRENT
CURRENT
CURRENT
ADAPTER
with Remote Sense
LOAD
-0.1
-0.2
-0.3
-10
-15
-20
-25
-30
-35
-40
0.3
0.2
0.1
-5
0
0
0
0
3 CELLS
1
BATTERY-VOLTAGE ERROR
SYSTEM LOAD TRANSIENT
20
LDO LOAD REGULATION
vs. CHARGE CURRENT
2 CELLS
CHARGE CURRENT (A)
CCI
CCS
2
40
200μs/div
I
LDO
3
(mA)
60
4
CHARGER OFF
4 CELLS
80
MAX8731A toc13
CCS
CCI
5
100
6
5A
0A
5A
0A
5A
0A
500mV/div
500mV/div
A
= +25°C,
11