Datasheet

MAX1667
Chemistry-Independent,
Level 2 Smart Battery Charger
8 _______________________________________________________________________________________
-1.0
-0.6
-0.8
-0.2
-0.4
0.2
0
0.4
0.8
0.6
1.0
04k6k8k2k 10k 12k 14k 18k16k 20k
BATT VOLTAGE ERROR
vs. ChargingVoltage() CODE
MAX1667 TOC12
ChargingVoltage() CODE
BATT VOLTAGE ERROR (%)
I
LOAD
= 3mA
V
DCIN
= 20V
MEASURED AT AVAILABLE
ChargingVoltage() CODES
I
LOAD
= 600mA
-5
0
5
10
15
0 1000 2000 3000500 1500 2500 3500 4000
LOAD CURRENT ERROR
MAX1667 TOC13
CODE
BATT CURRENT ERROR (%)
V
DCIN
=20V
V
BATT
= 12.75V
MEASURED AT AVAILABLE
ChargingCurrent() CODES
Typical Operating Characteristics (continued)
(Circuit of Figure 7, T
A
= +25°C, unless otherwise noted.)
100
0.01
10
1.0
0.1
0.001
0 400 800 1200 1600 2000
OUTPUT V-I CHARACTERISTIC
(SWITCHING REGULATOR)
MAX1667 TOC10
LOAD CURRENT (mA)
DROP IN BATT OUTPUT VOLTAGE (%)
V
DCIN
= 20V
ChargingVoltage() = 17,408mV
ChargingCurrent() = 1920mA
V
REF
= 4.096V
0
5
1
3
4
8
02468101214161820
OUTPUT V-I CHARACTERISTIC
(LINEAR SOURCE)
MAX1667 TOC11
V
IOUT
(V)
I
IOUT
(mA)
2
6
7
V
DCIN
= 20V
ChargingVoltage() = 17,408mV
ChargingCurrent() = 1 to 127mA
4.080
4.100
4.085
4.090
4.095
4.110
-40 4020-20 0 60 80 100
V
REF
vs. TEMPERATURE
MAX1667 TOC07
TEMPERATURE (°C)
V
REF
(V)
4.105
V
DCIN
= 20V
50
70
55
60
65
100
020001000 3000 4000
EFFICIENCY vs. LOAD CURRENT
(VOLTAGE REGULATION)
MAX1667 TOC08
LOAD CURRENT (mA)
EFFICIENCY (%)
75
80
85
90
95
A: V
DCIN
= 20V, V
BATT
= 17V
B: V
DCIN
= 16V, V
BATT
= 12.75V
C: V
DCIN
= 20V, V
BATT
= 12.75V
D: V
DCIN
= 16V, V
BATT
= 8.5V
E: V
DCIN
= 20V, V
BATT
= 8.5V
A
B
C
E
D
50
70
55
60
65
100
0862 4 10 12 18
EFFICIENCY vs. BATT VOLTAGE
(CURRENT REGULATION)
MAX1667 TOC09
BATT VOLTAGE (V)
EFFICIENCY (%)
75
80
85
90
95
14 16
A: V
DCIN
= 16V, I
LOAD
= 2A
B: V
DCIN
= 20V, I
LOAD
= 2A
C: V
DCIN
= 20V, I
LOAD
= 600mA
A
B
C