MAX1757 Maxim, MAX1757 Datasheet - Page 7

• Manufacturer Part Number: MAX1757
• Description: Stand-Alone / Switch-Mode Li Battery Charger with Internal 14V Switch
• Manufacturer: Maxim

(Circuit of Figure 1, V
unless otherwise noted.)
1000
4.45
4.40
4.35
4.30
4.25
4.20
4.15
4.10
4.05
4.00
3.95
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
100
0.1
10
0
1
0.1
0
0
Li+ Battery Charger with Internal 14V Switch
TIMEOUT vs. TIMER1 CAPACITANCE
VOLTAGE MODE
0.5
0.2
vs. CHARGING CURRENT
1.0 1.5 2.0
0.4
CHARGING CURRENT (A)
BATTERY VOLTAGE
vs. VADJ VOLTAGE
VOLTAGE LIMIT
PREQUALIFICATION MODE
CAPACITANCE (nF)
VADJ VOLTAGE (V)
TOP-OFF MODE
0.6
_______________________________________________________________________________________
DCIN
0.8
1
2.5 3.0 3.5 4.0 4.5
1.0
= 12V, V
1.2
1.4
SHDN
10
1.6
= V
VL
, V
4.215
4.210
4.205
4.200
4.195
4.190
4.185
1000
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
100
CELL
10
0
1
-40
0.1
0
= GND, V
0.5 1.0
-20
vs. TIMER2 CAPACITANCE
FAST-CHARGE TIMEOUT
vs. ISETOUT VOLTAGE
REFERENCE VOLTAGE
CHARGING CURRENT
Stand-Alone, Switch-Mode
vs. TEMPERATURE
0
ISETOUT VOLTAGE (V)
TEMPERATURE (°C)
1.5 2.0
CAPACITANCE (nF)
VADJ
20
1
2.5 3.0 3.5 4.0 4.5
= V
40
Typical Operating Characteristics
REF
60
/2, V
80
ISETIN
100
10
= V
ISETOUT
4.202
4.201
4.200
4.199
4.198
4.197
4.196
4.195
4.194
120
100
100
INPUT CURRENT-SENSE REGULATION VOLTAGE
80
60
40
20
90
80
70
60
50
0
6
0
0
= V
100
1 CELL
0.5
REFERENCE LOAD REGULATION
REF
200 300 400 500
1.0
8
vs. ISETIN VOLTAGE
, see Figure 1, T
vs. INPUT VOLTAGE
REFERENCE LOAD (µA)
ISETIN VOLTAGE (V)
INPUT VOLTAGE (V)
1.5 2.0 2.5 3.0 3.5 4.0 4.5
EFFICIENCY
2 CELLS
10
600 700 800 900 1000
I
CHG
12
A
= +25°C,
= 1.0A
14
7