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1MHz PWM Boost Converter for 1.5A
White LED Camera Flash
ABSOLUTE MAXIMUM RATINGS
OUT, OUTS, EN1, EN2 to GND ................................-0.3V to +6V
FLSH, MOV, LED, COMP, LX to GND ....-0.3V to (V OUTS + 0.3V)
LGND, PGND to GND. ..........................................-0.3V to +0.3V
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
LX Current. ........................................................................2A RMS
Continuous Power Dissipation (T A = +70°C)
14-Pin TDFN 3mm x 3mm (derate 18.2mW/°C
above +70°C)..............................................................1455mW
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 EN1 = V EN2 = 5V, V OUT = V OUTS = 4V, C OUT = 10μF, T A = -40°C to +85°C. Typical values are at T A = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
Supply Voltage
Undervoltage-Lockout
Threshold
OUT Quiescent Current, Flash or Movie Mode
CONDITIONS
IC supplied from OUTS
V OUTS rising, 100mV (typ) hysteresis
LX switching, I LED = 0mA
MIN
2.7
2.25
TYP
2.38
4
MAX
5.5
2.65
UNITS
V
V
mA
OUT Quiescent Current, Shutdown Mode
EN1 = EN2 = GND
T A = +25°C
T A = +85°C
0.1
1
1
μA
Overvoltage limit, I LED = 0mA, V LED = 0V
5.3
5.5
5.7
OUT Regulation Voltage
V LED = 0.5V
Disco mode, I LED = 80mA
3.65
4.8
3.85
5.0
3.95
5.2
V
LED Current, Shutdown Mode
EN1 = EN2 = GND
R MOV = 2k ? ,
T A = +25°C
T A = +85°C
Flash mode
1200
0.01
0.5
1500
1
μA
Current-Source Guaranteed Sink Current
R FLSH = 2k ? ,
Movie mode
338
360
mA
V LED = 0.5V
Disco mode
80
Current-Source Multiplier in MOV Mode
(I LED / I MOV)
I MOV up to 300μA
1200
A/A
Current-Source Accuracy in MOV Mode
MOV Current-Source Dropout Voltage
Disco Current-Source Current Setting
R MOV = 2k ? ,
V LED = 0.5V
R MOV = 2k ?
V EN1 = 0V, V EN2 = 5V
T A ≥ 0°C (Note 2)
T A = -40°C
-3
-6
62
±0.5
±0.5
48
80
+3
+6
100
108
%
mV
mA
Current-Source Multiplier in FLSH Mode
(I LED / I FLSH)
Current-Source Accuracy in FLSH Mode
I FLSH up to 300μA
R FLSH = 2k ? , V LED = 0.5V, T A ≥ -40°C
(Note 2)
5000
±3
A/A
%
FLSH Current-Source Dropout Voltage
LX n-Channel Current Limit
MOV Regulation Voltage
FLSH Regulation Voltage
LED to COMP Transconductance
R FLSH = 2k ?
V COMP = 1.5V
200
4.4
600
600
60
420
mV
A
mV
mV
μS
2
_______________________________________________________________________________________
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