MAX8847Z 查看數據表（PDF） - Maxim Integrated
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MAX8847Z
Maxim Integrated
MAX8847Z Datasheet PDF : 13 Pages
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MAX8847Y/MAX8847Z
High-Performance Negative Charge Pump
for 6 White LEDs in 3mm x 3mm Thin QFN
Typical Operating Characteristics
(VIN = 3.6V, VEN_ = VIN, circuit of Figure 1, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. SUPPLY VOLTAGE
(6 MATCHED LEDs)
100
20.8mA/LED
90
16.0mA/LED
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(6 MATCHED LEDs)
100
20.8mA/LED
90
EFFICIENCY vs. SUPPLY VOLTAGE
(6 MISMATCHED LEDs)
100
90
20.8mA / LED
80
70
60
50
2.7
6.4mA/LED
1.6mA/LED
VIN FALLING
3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
80
16mA/LED
70
6.4mA/LED
1.6mA/LED
60
50
4.2 3.9 3.8 3.7 3.6 3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME WEIGHTED)
80
70
16.0mA/LED
60
1.6mA/LED
50
2.7 3.0
6.4mA/LED
VIN FALLING
3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(6 MISMATCHED LEDs)
100
20.8mA/LED 16mA/LED
90
80
70
6.4mA/LED
1.6mA/LED
60
50
4.2 3.9 3.8 3.7 3.6 3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME WEIGHTED)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(6 MATCHED LEDs)
200
VIN FALLING
150
20.8mA / LED
16.0mA / LED
100
50
0
2.7
6.4mA / LED
1.6mA / LED
3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. Li+ BATTERY
VOLTAGE (6 MATCHED LEDs)
200
150
20.8mA / LED
16mA / LED
100
50
6.4mA / LED
1.6mA / LED
0
4.2 3.9 3.8 3.7 3.6 3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME WEIGHTED)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(6 MISMATCHED LEDs)
200
VIN FALLING
SUPPLY CURRENT vs. Li+ BATTERY
VOLTAGE (6 MISMATCHED LEDs)
200
150
150
20.8mA / LED
20.8mA / LED
16.0mA / LED
16mA / LED
100
100
50
0
2.7
6.4mA / LED
1.6mA / LED
3.0 3.3 3.6 3.9 4.2
SUPPLY VOLTAGE (V)
50
6.4mA / LED
1.6mA / LED
0
4.2 3.9 3.8 3.7 3.6 3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME WEIGHTED)
4
Maxim Integrated
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