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MAX8731AETI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
MAX8731A
SMBus Level 2 Battery Charger
with Remote Sense
10 ______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, adapter = 19.5V, ChargeVoltage() = 16.8V, ChargeCurrent() = 3.854A, InputCurrent() = 3.584A, T
A
= +25°C,
unless otherwise noted.)
INPUT CURRENT-LIMIT ERROR
vs. INPUT CURRENT-LIMIT SETTING
INPUT CURRENT-LIMIT SETTING (A)
INPUT CURRENT-LIMIT ERROR (%)
MAX8731A toc01
0246810
-6
-2
-4
0
2
4
6
MAXIMUM
MINIMUM
TYPICAL
INPUT CURRENT-LIMIT ERROR
vs. SYSTEM CURRENT
SYSTEM CURRENT (A)
INPUT CURRENT-LIMIT ERROR (%)
MAX8731A toc02
01234
-0.4
-0.2
0
0.2
0.4
INPUT CURRENT LIMIT = 2.048A
INPUT CURRENT LIMIT = 3.584A
INPUT CURRENT
LIMIT = 4.096A
INPUT CURRENT-LIMIT ERROR
vs. SYSTEM CURRENT
SYSTEM CURRENT (A)
INPUT CURRENT-LIMIT ERROR (%)
MAX8731A toc03
01234
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
V
BATT
= 8.4V
V
BATT
= 16.8V
V
BATT
= 12.6V
INPUT CURRENT LIMIT = 3.584A
IINP ERROR vs. SYSTEM CURRENT
SYSTEM CURRENT (A)
IINP ERROR (%)
MAX8731A toc04
01.00.5 2.01.5 2.5 3.0 3.5 4.0
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
INPUT CURRENT LIMIT = 2.048A
INPUT CURRENT LIMIT = 3.584A
INPUT CURRENT LIMIT = 4.096A
OPERATING AT INPUT CURRENT LIMIT
IINP ERROR vs. SYSTEM CURRENT
SYSTEM CURRENT (A)
IINP ERROR (%)
MAX8731A toc05
01234
0
0.5
1.0
1.5
2.0
2.5
V
BATT
= 8.4V
V
BATT
= 12.6V
V
BATT
= 16.8V
INPUT CURRENT LIMIT = 3.584A
IINP ERROR vs. INPUT CURRENT
INPUT CURRENT (A)
IINP ERROR (%)
MAX8731A toc06
0123456
-10
-6
-8
-2
2
6
-4
0
4
8
10
MAXIMUM
MINIMUM
TYPICAL
NOT SWITCHING
CHARGE-CURRENT ERROR
vs. CHARGE CURRENT-LIMIT SETTING
CHARGE-CURRENT SETTING (A)
CHARGE-CURRENT LIMIT ERROR (%)
MAX8731A toc07
024 86
-10
-6
-8
-2
2
6
-4
0
4
8
10
MAXIMUM
MINIMUM
TYPICAL
CHARGE-CURRENT ERROR
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
CHARGE-CURRENT ERROR (%)
MAX8731A toc08
3 6 9 12 15 18
-4
-2
0
2
4
3.072A
3.968A
8.064A
TRICKLE-CHARGE CURRENT ERROR
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
TRICKLE-CHARGE CURRENT ERROR (%)
MAX8731A toc09
0 3 6 9 12 15 18
-30
-25
-15
-20
-10
-5
0
5
ChargeCurrent( ) = 128mA
CHARGE-VOLTAGE ERROR
vs. CHARGE-VOLTAGE SETTING
CHARGE-VOLTAGE SETTING (V)
CHARGE-VOLTAGE ERROR (%)
MAX8731A toc10
4 8 12 16 20
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
BATTERY-VOLTAGE ERROR
vs. CHARGE CURRENT
CHARGE CURRENT (A)
BATTERY-VOLTAGE ERROR (%)
MAX8731A toc11
0123456
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
3 CELLS
2 CELLS
4 CELLS
BATTERY REMOVAL
20μs/div
MAX8731A toc12
13.5V
13.0V
12.5V
V
OUT
OUTPUT CAPACITOR = 22μF
ChargeVoltage( ) = 12.6V
V
OUT
OUTPUT CAPACITOR = 10μF
SYSTEM LOAD TRANSIENT
200μs/div
MAX8731A toc13
LOAD
CURRENT
ADAPTER
CURRENT
INDUCTOR
CURRENT
CCS VOLTAGE
500mV/div
CCI VOLTAGE
500mV/div
5A
0A
0A
5A
5A
0A
500mV/div
500mV/div
CCI
CCS
CCI
CCS
EFFICIENCY vs. CHARGE CURRENT
CHARGE CURRENT (A)
EFFICIENCY (%)
MAX8731A toc14
02468
60
65
70
75
80
85
90
95
100
2 CELLS
3 CELLS
4 CELLS
LDO LOAD REGULATION
I
LDO
(mA)
LDO ERROR (mV)
MAX8731A toc15
0 20406080100
-40
-35
-30
-25
-20
-15
-10
-5
0
CHARGER OFF
MAX8731A
SMBus Level 2 Battery Charger
with Remote Sense
______________________________________________________________________________________ 11
Typical Operating Characteristics (continued)
(Circuit of Figure 1, adapter = 19.5V, ChargeVoltage() = 16.8V, ChargeCurrent() = 3.854A, InputCurrent() = 3.584A, T
A
= +25°C,
unless otherwise noted.)
Typical Operating Characteristics (continued)
(Circuit of Figure 1, adapter = 19.5V, ChargeVoltage() = 16.8V, ChargeCurrent() = 3.854A, InputCurrent() = 3.584A, T
A
= +25°C,
unless otherwise noted.)
MAX8731A
SMBus Level 2 Battery Charger
with Remote Sense
12 ______________________________________________________________________________________
SWITCHING FREQUENCY
V
ADAPTER
- V
BATTERY
(V)
FREQUENCY (kHz)
MAX8731A toc19
0 5 10 15 20
150
200
250
300
350
400
450
BATTERY-CHARGE CURVE
TIME (h)
CHARGE CURRENT (A)
MAX8731A toc20
BATTERY VOLTAGE (V)
10.0
10.5
11.0
11.5
12.0
12.5
13.0
0123456
0
1
2
3
4
5
BATTERY VOLTAGE
CHARGE CURRENT
2.8Ah x 3S3P BATTERY
ADAPTER CURRENT
vs. ADAPTER VOLTAGE
ADAPTER VOLTAGE (V)
ADAPTER CURRENT (mA)
MAX8731A toc21
0 5 10 15 20 25 30
0
0.5
1.0
1.5
2.0
2.5
3.0
NOT SWITCHING
SWITCHING, NO LOAD
ChargeVoltage( ) = 4.192V
BATTERY-LEAKAGE CURRENT
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
BATTERY CURRENT (μA)
MAX8731A toc22
0 5 10 15 20
0
0.5
1.0
1.5
2.0
2.5
ADAPTER PRESENT OR ABSENT
LDO LINE REGULATION
V
DCIN
(V)
LDO ERROR (mV)
MAX8731A toc16
8 131823
-6
-5
-4
-3
-2
-1
0
NOT SWITCHING
REF LOAD REGULATION
I
REF
(mA)
REF ERROR (%)
MAX8731A toc17
0 0.2 0.4 0.6 0.8 1.0
-0.20
-0.15
-0.10
-0.05
0
0.05
0.10
0.15
0.20
NOT SWITCHING
REF ERROR vs. TEMPERATURE
TEMPERATURE (°C)
REF ERROR (%)
MAX8731A toc18
-40 -20 0 20 40 60 80
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32

MAX8731AETI+

Mfr. #:
Buy MAX8731AETI+
Manufacturer:
Maxim Integrated
Description:
Battery Management SMBus Level 2 Battery Charger
Lifecycle:
New from this manufacturer.
Delivery:
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