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MAX1582 Datasheet(Fiches technique) 5 Page - Maxim Integrated Products

Numéro de pièce MAX1582
Description  High-Efficiency, 26V Step-Up Converter for White LED Main and Subdisplay Backlighting
Télécharger  10 Pages
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1582 Datasheet(HTML) 5 Page - Maxim Integrated Products

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High-Efficiency, 26V Step-Up Converter
for White LED Main and Subdisplay Backlighting
_______________________________________________________________________________________
5
Pin Description
SWITCHING WAVEFORMS
MAX1582 toc07
VIN
10mV/div
VOUT
100mV/div
VLX
10V/div
500ns/div
DIRECT-PWM DIMMING
MAX1582 toc08
VCTRL
32kHz
1V/div
IIN
50mA/div
VIN
50mV/div
VOUT
5V/div
0mA
0V
0V
50
µs/div
VIN = 3.8V Li+ BATTERY
Typical Operating Characteristics (continued)
(See the Typical Applications Circuit, VV+ = VVP = 3.6V, ILED = 15mA, L1 = 22µH, COUT1 = 0.1µF, CCOMP = 0.022µF, RSENSE = 7.5
Ω,
VCTRL = 1.5V, 4 LEDs, TA = +25°C, unless otherwise noted.)
PIN
QFN
UCSP
NAME
FUNCTION
1A1
V+
Input Voltage Supply. Input voltage range is 2.6V to 5.5V. Connect a 2.2µF capacitor from V+ to
PGND.
2
A2
VP
High-Current Input Supply. Connect to V+.
3A3
CTRL
Brightness Control Input. LED brightness is controlled by the voltage applied to CTRL. Varying the
voltage from 0 to +1.62V adjusts the brightness from dim to bright, respectively. Any voltage
above +1.62V does not increase brightness.
4
A4
COMP
Compensation Input. Connect a 0.022µF capacitor (CCOMP) from COMP to GND. CCOMP
stabilizes the converter and controls soft-start. CCOMP discharges to GND when in shutdown.
5
B4
GND
Ground. Connect to PGND at a single point near the IC.
6
C4
EN1
Enable 1 Input. Drive EN1 high to enable the main-display LEDs. Pull EN1 low to turn off the main-
display LEDs. Pull both EN1 and EN2 low to place the IC in low-current shutdown mode.
7
D4
EN2
Enable 2. Drive EN2 high to enable the subdisplay LEDs. Pull EN2 low to turn off the subdisplay
LEDs. Pull both EN1 and EN2 low to place the IC in low-current shutdown mode.
8D3
CS
Current-Sense Feedback Input. Connect a resistor (RSENSE) from CS to GND to set the LED bias
current. The voltage at CS regulates to VCTRL / 10 or +0.162V, whichever is lower.
9
D2
OUT2
Display Switch Output. OUT2 is internally connected to CS when only the main display is lit. OUT2
is internally connected to OUT1 when only the subdisplay is lit. OUT2 is high impedance when
both displays are lit and when the IC is shut down.
10
D1
OUT1
Overvoltage Sense. When VOUT1 is greater than 27V, the internal N-channel MOSFET turns off until
VOUT1 drops below 25V, then the IC reenters soft-start. Connect a 0.1µF capacitor from OUT1 to
PGND.
11
C1
LX
Inductor Connection. During shutdown, this pin is high impedance.
12
B1
PGND
Power Ground. Connect to GND at a single point near the IC.
EP
EP
Exposed Paddle. Connect directly to GND and PGND under the IC.


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