Datasheet

MAX745
Switch-Mode Lithium-Ion
Battery Charger
4 _______________________________________________________________________________________
4.5
0
0 0.1 0.2 0.4 1.0
BATTERY VOLTAGE
vs. CHARGING CURRENT
1.0
4.0
MAX745/TOC-01
CHARGING CURRENT (A)
BATTERY VOLTAGE (V)
0.3 0.5 0.6 0.7 0.8 0.9
3.0
2.0
0.5
3.5
2.5
1.5
R1 = 0.2Ω
R16 = SHORT
R12 = OPEN CIRCUIT
200
0
0 0.5 1.5 4.0
CURRENT-SENSE VOLTAGE
vs. SETI VOLTAGE
40
160
MAX745/TOC-02
SETI VOLTAGE (V)
CURRENT-SENSE VOLTAGE (mV)
1.0 2.0 2.5 3.0 3.5
120
80
180
20
140
100
60
R1 = 0.2Ω
4.45
3.95
0 0.5 1.0 2.0 4.5
VOLTAGE LIMIT
vs. VADJ VOLTAGE
4.05
4.35
MAX745/TOC-03
VADJ VOLTAGE (V)
PER-CELL VOLTAGE LIMIT (V)
1.5 2.5 3.0 3.5 4.0
4.25
4.15
4.40
4.00
4.30
4.20
4.10
4.205
4.195
02550
REFERENCE VOLTAGE
vs. TEMPERATURE
4.197
4.203
MAX745/TOC-06
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
75 100
4.201
4.199
4.204
4.196
4.202
4.200
4.198
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, V
DCIN
= 18V, V
BATT
= 4.2V, CELL0 = CELL1 = GND, C
VL
= 4.7µF C
REF
= 0.1µF. Circuit of Figure 1, unless otherwise
noted.)
5.50
0
0 5 10 25
VL LOAD REGULATION
5.10
5.40
MAX745/TOC-04
VL OUTPUT CURRENT (mA)
VL OUTPUT VOLTAGE (V)
15 20
5.30
5.20
5.45
5.05
5.35
5.25
5.15
4.25
4.15
0 500 1000 3000
REFERENCE LOAD REGULATION
4.17
4.23
MAX745/TOC-05
REFERENCE CURRENT (µA)
REFERENCE VOLTAGE (V)
1500 2000 2500
4.21
4.19
4.24
4.16
4.22
4.20
4.18