Datasheet

Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
0
1.0
0.5
2.5
2.0
1.5
4.0
3.5
3.0
4.5
01.00.5 1.5 2.0 2.5
BATTERY VOLTAGE
vs. CHARGING CURRENT
MAX1737 toc01
CHARGING CURRENT (A)
BATTERY VOLTAGE (V)
R18 = 0.1Ω
0
50
25
125
100
75
175
200
150
225
0 1.5 2.00.5 1.0 2.5 3.0 3.5 4.0 4.5
CHARGING CURRENT-SENSE VOLTAGE
vs. ISETOUT VOLTAGE
MAX1737 toc02
ISETOUT VOLTAGE (V)
CHARGING CURRENT-SENSE VOLTAGE (mV)
0
20
40
60
80
100
120
01.00.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5
INPUT CURRENT-SENSE VOLTAGE
vs. ISETIN VOLTAGE
MAX1737 toc03
ISETIN VOLTAGE (V)
INPUT CURRENT-SENSE VOLTAGE (mV)
3.95
4.05
4.00
4.15
4.10
4.25
4.20
4.30
4.40
4.35
4.45
0 1.0 1.5 2.00.5 2.5 3.0 3.5 4.0 4.5
VOLTAGE LIMIT vs. VADJ VOLTAGE
MAX1737 toc04
VADJ VOLTAGE (V)
VOLTAGE LIMIT (V)
4.175
4.185
4.180
4.195
4.190
4.200
4.205
-40 20 40-20 0 60 80 100
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1737 toc05
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
50
60
70
80
90
100
8 1216202428
EFFICIENCY vs. INPUT VOLTAGE
MAX1737 toc06
INPUT VOLTAGE (V)
EFFICIENCY (%)
CELL = FLOAT (2 CELLS)
V
BATT
= 7V
R18 = 0.1Ω (I
BATT
= 2A)
4.190
4.194
4.192
4.198
4.196
4.202
4.200
4.204
4.208
4.206
4.210
0 200 300 400100 500 600 700 900800 1000
REFERENCE LOAD REGULATION
MAX1737 toc07
REFERENCE CURRENT (μA)
REFERENCE VOLTAGE (V)
1000
0.1
0.1 1 10
TIMEOUT vs. TIMER1 CAPACITANCE
1
MAX1737 toc08
CAPACITANCE (nF)
TIMEOUT (MINUTES)
10
100
PREQUALIFICATION MODE
TOP-OFF MODE
FULL-CHARGE
MODE
1000
1
0.1 1 10
FAST-CHARGE TIMEOUT
vs. TIMER2 CAPACITANCE
10
MAX1737 toc09
CAPACITANCE (nF)
TIMEOUT (MINUTES)
100
Typical Operating Characteristics
(Circuit of Figure 1, V
DCIN
= +18V, ISETIN = ISETOUT = REF, V
VADJ
= V
REF
/ 2, T
A
= +25°C, unless otherwise noted.)
Maxim Integrated
7
MAX1737