MAX8731 Maxim Integrated Products, MAX8731 Datasheet - Page 11

• Manufacturer Part Number: MAX8731
• Description: SMBus Level 2 Battery Charger
• Manufacturer: Maxim Integrated Products

(Circuit of Figure 1, adapter = 19.5V, ChargeVoltage() = 16.8V, ChargeCurrent() = 3.854A, InputCurrent() = 3.584A, T
unless otherwise noted.)
SMBus Level 2 Battery Charger with
-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
3 CELLS
OUTPUT CAPACITOR = 10µF
20µs/div
12
ChargeVoltage( ) = 12.6V
4
4 CELLS
16
Typical Operating Characteristics (continued)
6
MAX8731 toc12
20
8
13.5V
13.0V
12.5V
CCS VOLTAGE
CCI VOLTAGE
500 mV/div
500 mV/div
INDUCTOR
CURRENT
CURRENT
CURRENT
ADAPTER
LOAD
-0.1
-0.2
-0.3
0.3
0.2
0.1
0.0
-10
-15
-20
-25
-30
-35
-40
-5
0
0
0
3 CELLS
1
BATTERY-VOLTAGE ERROR
SYSTEM LOAD TRANSIENT
20
LDO LOAD REGULATION
vs. CHARGE CURRENT
2 CELLS
Remote Sense
CHARGE CURRENT (A)
CCS
CCI
2
40
200µs/div
I
LDO
3
(mA)
60
4
CHARGER OFF
4 CELLS
80
CCS
MAX8731toc13
CCI
5
100
6
5A
0A
5A
0A
5A
0A
500mV/div
500mV/div
A
= +25°C,
11