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White LED Camera-Flash
Boost Converter
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
—
NAME
GND
IN
MOV
STB
POK
EN1
EN2
OUT
LED
LX
EP
FUNCTION
Ground. Connect to exposed paddle.
Input Voltage Supply. Input voltage range is 2.6V to 5.5V. Bypass IN to GND with a 4.7μF ceramic capacitor.
Movie Current-Set Input. Connect a resistor from MOV to GND to set the LED current for movie-mode
operation. R MOV = 60 / I LED (where R MOV > 600k Ω ).
Strobe Current-Set Input. Connect a resistor from STB to GND to set the LED current for strobe-mode
operation. R STB = 600 / I LED (where R STB > 2k Ω ).
Power-OK Output. Pulled to GND during precharge mode. POK goes high impedance once V OUT reaches 24V.
Enable 1. EN1 and EN2 are digital inputs that determine the operational mode of the MAX1583. See Table 1.
Enable 2. EN1 and EN2 are digital inputs that determine the operational mode of the MAX1583. See Table 1.
Output-Voltage Sense Input. The boost-converter circuit in the MAX1583 is disabled once V OUT is greater
than 24V. When V OUT falls below 23.5V, the converter is enabled.
LED Return Input. Connect to the cathode of the series LEDs. Regulates to 0.6V in movie mode. LED is high
impedance during shutdown and precharge mode.
Inductor Connection. Drain of the internal power MOSFET. Connect to the switched side of the inductor. LX is
high impedance during shutdown.
Exposed Paddle. Connect to the circuit ground plane.
Functional Diagram
CURRENT-LIMIT
CURRENT-LIMIT
THERMAL
COMPARATOR
THRESHOLD
IN
MAX1583
LIMIT
LX
REFERENCE
MOVIE-MODE
BOOST-CONVERTER
CONTROL
POK CIRCUITRY
N
N
POK
FEEDBACK
COMPARATOR
POK
COMPARATOR
OUT
EN1
EN2
MOV
ENABLE
DECODE
STB
CURRENT REGULATOR
GND
N
LED
6
_______________________________________________________________________________________
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