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1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
ABSOLUTE MAXIMUM RATINGS
IN, OUT, EN1, EN2 to GND ...................................-0.3V to +6.0V
OUT to GND During Shutdown....................-0.3V to (V IN + 0.3V)
OUT to CS .............................................................-0.6V to +0.6V
CS to GND................................................-0.3V to (V OUT + 0.3V)
CN to GND...................................................-0.3V to (V IN + 0.3V)
CP to GND .....-0.3V to the Greater of (V OUT + 1V) or (V IN + 1V)
Continuous Power Dissipation (T A = +70°C)
8-Pin TDFN (derate 18.2mW/°C above +70°C) ..........1455mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
OUT Short Circuit to GND ..........................................Continuous
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(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
IN Operating Voltage
Undervoltage-Lockout Threshold
V IN rising
CONDITIONS
MIN
2.7
2.3
TYP
2.45
MAX
5.5
2.6
UNITS
V
V
Undervoltage-Lockout Hysteresis
35
mV
Supply Current
1MHz switching, no load
1x LDO mode, no switching
5
0.225
0.3
mA
Shutdown Supply Current
EN1 = EN2 = GND
T A = +25 ° C
T A = +85 ° C
0.01
0.2
1
μA
Soft-Start Time
OUT Overvoltage Protection
0.5
5.3
ms
V
MAX1577Z, T A = +25 ° C,
I OUT = 100mA
EN1 or EN2 = IN
4.95
5.10
5.25
OUT Voltage Regulation Mode
MAX1577Y, T A = +25 ° C,
I OUT = 100mA
EN1 = GND, EN2 = IN
EN1 = IN, EN2 = GND
EN1 = EN2 = IN
3.17
4.40
4.95
3.40
4.60
5.10
3.60
4.80
5.25
V
CS Voltage-Mode Threshold
(V OUT - V CS )
EN1 = GND, EN2 = IN
24
60
mV
CS Regulation Voltage
(V OUT - V CS )
EN1 = IN, EN2 = GND
EN1 = EN2 = IN
100
300
mV
CS Threshold Accuracy
T A = +25 ° C
V IN = 2.7V to 5.5V, TA = -40 ° C to +85 ° C
-2
-3
±0.5
+2
+3
%
Maximum OUT Current
Open-Loop OUT Resistance
OUT Internal Pulldown in
Shutdown
Switching Frequency
V LED = 4.1V, EN1 = EN2 = IN
1x LDO mode
2x mode, V IN = 3.4V
EN1 = EN2 = GND
V IN = 3.1V
V IN = 3.4V
600
800
0.80
900
1200
0.6
2
5
1.0
3
1.25
mA
?
k ?
MHz
2
_______________________________________________________________________________________
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