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MAX1582 Fiches technique(PDF) 1 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) 1 Page - Maxim Integrated Products

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General Description
The MAX1582 drives up to six white LEDs in series with
a constant current to provide display backlighting for
two (main and sub-) displays in cell phones and other
hand-held devices. This configuration eliminates the
need for ballast resistors and expensive factory calibra-
tion. The proprietary dual-output, step-up pulse-width
modulation (PWM) converter includes a 30V, low RDSON
N-channel MOSFET switch for high efficiency and maxi-
mum battery life.
The MAX1582 utilizes 1MHz current-mode PWM control
to allow small input and output capacitors and a small
inductor, while minimizing ripple on the input supply and
avoiding interference to sensitive circuitry in the equip-
ment. Integrated overvoltage protection eliminates the
need for an external zener diode to protect the IC from
open circuit. Flexible dimming control utilizes either an
analog control signal or direct digital PWM control with-
out external RC filtering. This also increases dimming
accuracy at low brightness levels. The PWM dimming
signal can be any frequency from 200Hz to 200kHz.
Soft-start eliminates inrush current during startup.
The MAX1582 is available in tiny 4 4 chip-scale
(UCSP™) and 12-pin thin QFN packages.
Applications
Cell Phones with One or Two Displays
Smart Phones, Palmtops, and Wireless
Handhelds
Other Hand-Held Devices with Dual Displays
Features
o Accurate Current Regulation for Uniform
Illumination
o Lights Up Two LED Sections for Main and
Subdisplays
o Up to 84% Efficiency
o Internal High-Power, 30V MOSFET
o Low 15mVP-P Input Ripple
o Flexible Dimming Control
Analog DAC Controlled
Direct-Digital PWM (No RC Required)
from 200Hz to 200kHz
o Overvoltage Protection to Eliminate Zener Diode
o Constant 1MHz PWM Operation
o Low-Profile Inductor and Capacitors
o Soft-Start Eliminates Inrush Current
o 2.6V to 5.5V Input
o 0.01µA (typ) Shutdown Current
o Tiny UCSP (2.1mm 2.1mm 0.61mm) and Thin
QFN (4mm 4mm) Packages
High-Efficiency, 26V Step-Up Converter
for White LED Main and Subdisplay Backlighting
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-2783; Rev 0; 4/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALU
ATION
KIT
AVAIL
ABLE
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX1582ETC
-40
°C to +85°C 12 Thin QFN-EP*
AACE
MAX1582EBE-T-40
°C to +85°C 16 UCSP-16
1582EBE
Pin Configurations
MAX1582
INPUT
2.6V TO 5.5V
2.2
µF
0.022
µF
0.1
µF
V+
VP
CTRL
EN1
EN2
COMP
22
µH
LX
OUT1
PGND
OUT2
CS
GND
2 TO 4 LEDS
MAIN
DISPLAY
2 TO 3 LEDS
SUB-
DISPLAY
7.5
ANALOG OR
DIRECT PWM
DIMMING
Typical Application Circuit
MAX1582
1
V+
TOP VIEW
2
VP
3
CTRL
OUT2
CS
EN2
9
8
7
12
11
10
45
6
4mm x 4mm
THIN QFN
Pin Configurations continued at end of data sheet.
*EP = Exposed paddle.
UCSP is a trademark of Maxim Integrated Products, Inc.


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