1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 3.6V, circuit of Figure 2, EN1 = EN2 = IN, R CS = 60 ? , C IN = 4.7μF, C1 = 2.2μF, C OUT = 10μF, T A = -40°C to +85°C, unless
otherwise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
EN_ Logic-High Voltage
EN_ Logic-Low Voltage
V IN = 4.2V to 5.5V
V IN = 2.7V to 4.2V
V IN = 2.7V to 5.5V
1.6
1.4
0.4
V
V
Logic Input Current
Thermal-Shutdown Threshold
V EN _ = 0V or 5.5V
T J rising
T A = +25°C
T A = +85°C
0.02
0.02
+160
1
μA
° C
Thermal-Shutdown Hysteresis
20
° C
Note 1: Limits are 100% production tested at T A = +25 ° C. Limits over the operating temperature range are guaranteed by design.
Typical Operating Characteristics
(V IN = 3.6V, circuit of Figure 2, R CS = 0.27 ? , Luxeon LXCL-PWF1 LED, T A = +25 ° C, unless otherwise noted.)
LED CURRENT vs. SUPPLY VOLTAGE
EFFICIENCY vs. SUPPLY VOLTAGE
BATTERY CURRENT vs. SUPPLY VOLTAGE
1200
1000
800
1100mA AT 3.78V F
100
90
80
70
R CS = 0.27?
2500
2000
R CS = 0.27?
1100mA AT 3.78V F
60
1500
600
400
200
370mA AT 3.33V F
50
40
30
20
220mA AT 3.15V F
370mA AT 3.33V F
1100mA AT 3.78V F
1000
500
370mA AT 3.33V F
220mA AT 3.15V F
R CS = 0.27 ?
220mA AT 3.15V F
10
0
0
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
SUPPLY VOLTAGE (V)
LED CURRENT vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
EFFICIENCY vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
BATTERY CURRENT vs. SUPPLY VOLTAGE
900
800
700
100
90
80
770mA AT 3.66V F
1800
1600
1400
R CS = 0.39?
600
500
400
770mA AT 3.66V F
250mA AT 3.21V F
70
60
50
40
1200
1000
800
770mA AT 3.66V F
250mA AT 3.21V F
300
200
30
20
150mA AT 3.06V F
250mA AT 3.21V F
600
400
150mA AT 3.06V F
100
0
R CS = 0.39 ?
150mA AT 3.06V F
10
0
R CS = 0.39?
200
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
3
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