MAX1908 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX1908 Datasheet PDF : 30 Pages
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MAX1908/MAX8724/MAX8765/MAX8765A
Low-Cost Multichemistry Battery Chargers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VDCIN = 20V, TA = +25°C, unless otherwise noted.)
VDCIN
10V/div
VBATT
500mV/div
LINE-TRANSIENT RESPONSE
MAX1908 toc04
INDUCTOR
CURRENT
500mA/div
ICTL = LDO
10ms/div
VCTL = LDO
ICHARGE = 3A
LINE STEP 18.5V TO 27.5V
REF VOLTAGE LOAD REGULATION
0
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-0.07
-0.08
-0.09
-0.10
0
100 200 300 400 500
REF CURRENT (µA)
LDO LOAD REGULATION
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
VLDO = 5.4V
-0.9
-1.0
012345678
LDO CURRENT (mA)
9 10
REF VOLTAGE ERROR vs. TEMPERATURE
0.10
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
-40 -15
10
35
60
85
TEMPERATURE (°C)
LDO LINE REGULATION
0.05
0.04
ILDO = 0
0.03
VLDO = 5.4V
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.05
8 10 12 14 16 18 20 22 24 26 28
VIN (V)
EFFICIENCY vs. CHARGE CURRENT
100
90
80
70
VBATT = 16V
60
VBATT = 12V
50
40
VBATT = 8V
30
20
10
0
0.01
0.1
1
10
CHARGE CURRENT (A)
FREQUENCY vs. VIN - VBATT
500
450
400
3 CELLS
350
4 CELLS
300
250
200
150
100
ICHARGE = 3A
VCTL = ICTL = LDO
50
0
0 2 4 6 8 10 12 14 16 18 20 22
(VIN - VBATT) (V)
OUTPUT V/I CHARACTERISTICS
0.5
0.4
2 CELLS
0.3
3 CELLS
0.2
0.1
0
-0.1
4 CELLS
-0.2
-0.3
-0.4
-0.5
0
1
2
3
4
BATT CURRENT (A)
BATT VOLTAGE ERROR vs. VCTL
0.08
0.07
0.06
0.05
0.04
0.03
0.02
4 CELLS
0.01
REFIN = 3.3V
NO LOAD
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
VCTL/REFIN (%)
Maxim Integrated
11
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