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MAX1582 Fiches technique(PDF) 6 Page - Maxim Integrated Products

No de pièce MAX1582
Description  High-Efficiency, 26V Step-Up Converter for White LED Main and Subdisplay Backlighting
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1582 Fiches technique(HTML) 6 Page - Maxim Integrated Products

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Detailed Description
The MAX1582’s high efficiency and small size make it
ideally suited to drive up to six series-connected LEDs.
Separate enable inputs are provided to control the main
and subdisplay backlighting. The MAX1582 operates as
a boost DC-to-DC converter that regulates output current
rather than voltage. It provides even illumination by sourc-
ing the same output current through each LED, eliminat-
ing the need for expensive factory calibration. The fast
1MHz internal oscillator allows for a small inductor and
small input and output capacitors while minimizing input
and output ripple.
Shutdown for Main and Subdisplay
The MAX1582 has two enable inputs (EN1 and EN2)
used to enable or shutdown the main and subdisplay
LEDs. When EN1 and EN2 are both high, all LEDs are
lit. With EN1 high and EN2 low, the main-display LEDs
are lit, and the subdisplay LEDs are shorted by the
MAX1582. With EN1 low and EN2 high, the main-display
LEDs are shorted and the subdisplay LEDs are lit.
When both EN1 and EN2 are low, the MAX1582 enters
shutdown, reducing supply current to 0.01µA (typ).
Although the internal N-channel MOSFET does not
switch in shutdown, there is still a DC-current path
High-Efficiency, 26V Step-Up Converter
for White LED Main and Subdisplay Backlighting
6
_______________________________________________________________________________________
SLOPE COMP.
CURRENT SENSE
114k
336k
50k
PWM
CONTROL
CTRL
LX
CS
V+
UP TO 27V
2.6V TO 5.5V
DAC OR
PWM
COMP
OUT1
PGND
OVERVOLTAGE
PROTECTION
GND
EN1
EN2
2 TO 4 LEDS
2 TO 3 LEDS
OUT2
D1
1.25V CLAMP
UP TO 13V
VP
CIN
2.2
µF
COUT1
0.1
µF
L1
22
µF
ENABLE
INPUTS
MAIN DISPLAY
SUBDISPLAY
gm
CCOMP
0.022
µF
RSENSE
7.5
SHUTDOWN
fOSC
1.0MHz
MAX1582
Figure 1. Functional Diagram


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