MAX1577Y Datasheet, PDF (2/11 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
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)
OUT Short Circuit to GND ..........................................Continuous
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
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 = 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
IN Operating Voltage
Undervoltage-Lockout Threshold V_IN rising
Undervoltage-Lockout Hysteresis
Supply Current
Shutdown Supply Current
Soft-Start Time
1MHz switching, no load
1x LDO mode, no switching
EN1 = EN2 = GND
T_A = +25°C
T_A = +85°C
OUT Overvoltage Protection
MAX1577Z, T_A = +25°C,
I_OUT = 100mA
EN1 or EN2 = IN
OUT Voltage Regulation Mode
MAX1577Y, T_A = +25°C,
I_OUT = 100mA
EN1 = GND, EN2 = IN
EN1 = IN, EN2 = GND
EN1 = EN2 = IN
CS Voltage-Mode Threshold
(V_OUT - V_CS)
CS Regulation Voltage
(V_OUT - V_CS)
EN1 = GND, EN2 = IN
EN1 = IN, EN2 = GND
EN1 = EN2 = IN
CS Threshold Accuracy
Maximum OUT Current
Open-Loop OUT Resistance
T_A = +25°C
V_IN = 2.7V to 5.5V, TA = -40°C to +85°C
V_LED = 4.1V, EN1 = EN2 = IN ^{VIN = 3.1V}
V_IN = 3.4V
1x LDO mode
2x mode, V_IN = 3.4V
OUT Internal Pulldown in
Shutdown
EN1 = EN2 = GND
Switching Frequency
MIN TYP MAX UNITS
2.7
5.5
V
2.3 2.45 2.6
V
35
mV
5
mA
0.225 0.3
0.01
1
µA
0.2
0.5
ms
5.3
V
4.95 5.10 5.25
3.17 3.40 3.60
V
4.40 4.60 4.80
4.95 5.10 5.25
24
mV
60
100
mV
300
-2
±0.5 +2
%
-3
+3
600 900
mA
800 1200
0.6
Ω
2
3
5
kΩ
0.80
1.0
1.25
MHz
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