MAX1577Y Datasheet, PDF (3/11 Pages) Maxim Integrated Products – 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights

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 = 60Ω, 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
Logic Input Current
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
V_IN = 4.2V to 5.5V
V_IN = 2.7V to 4.2V
V_IN = 2.7V to 5.5V
V_{EN_} = 0V or 5.5V
T_J rising
T_A = +25°C
T_A = +85°C
1.6
V
1.4
0.4
V
0.02
1
µA
0.02
+160
°C
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 = 0.27Ω, Luxeon LXCL-PWF1 LED, T_A = +25°C, unless otherwise noted.)
LED CURRENT vs. SUPPLY VOLTAGE
1200
1000
1100mA AT 3.78V_F
800
600
370mA AT 3.33V_F
400
200
R_CS = 0.27Ω
0
220mA AT 3.15V_F
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
EFFICIENCY vs. SUPPLY VOLTAGE
100
90
R_CS = 0.27Ω
80
70
60
50
40
220mA AT 3.15V_F
30
370mA AT 3.33V_F
20
1100mA AT 3.78V_F
10
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
BATTERY CURRENT vs. SUPPLY VOLTAGE
2500
R_CS = 0.27Ω
2000
1100mA AT 3.78V_F
1500
370mA AT 3.33V_F
1000
220mA AT 3.15V_F
500
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
LED CURRENT vs. SUPPLY VOLTAGE
900
800
700
600
770mA AT 3.66V_F
500
400
250mA AT 3.21V_F
300
200
100
R_CS = 0.39Ω
0
150mA AT 3.06V_F
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
EFFICIENCY vs. SUPPLY VOLTAGE
100
770mA AT 3.66V_F
90
80
70
60
50
40
30 _{150mA AT 3.06VF}
20
250mA AT 3.21V_F
10
R_CS = 0.39Ω
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
BATTERY CURRENT vs. SUPPLY VOLTAGE
1800
R_CS = 0.39Ω
1600
1400
1200
770mA AT 3.66V_F
1000
800 ^{250mA AT 3.21VF}
600
150mA AT 3.06V_F
400
200
0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________ 3