19-2783; Rev 0; 4/03
High-Efficiency, 26V Step-Up Converter
for White LED Main and Subdisplay Backlighting
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 R
DSON
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
鉁?/div>
4 chip-scale
(UCSP鈩? and 12-pin thin QFN packages.
KIT
ATION
EVALU
LE
B
AVAILA
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 15mV
P-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
0.01碌A(chǔ) (typ) Shutdown Current
o
Tiny UCSP (2.1mm
鉁?/div>
2.1mm
鉁?/div>
0.61mm) and Thin
QFN (4mm
鉁?/div>
4mm) Packages
MAX1582
Applications
Cell Phones with One or Two Displays
Smart Phones, Palmtops, and Wireless
Handhelds
Other Hand-Held Devices with Dual Displays
PART
MAX1582ETC
Ordering Information
TEMP RANGE
PIN-PACKAGE
TOP
MARK
AACE
1582EBE
-40擄C to +85擄C 12 Thin QFN-EP*
MAX1582EBE-T -40擄C to +85擄C 16 UCSP-16
*EP
= Exposed paddle.
Typical Application Circuit
INPUT
2.6V TO 5.5V
2.2碌F
22碌H
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations
OUT1
10
9
OUT2
CS
EN2
8
7
4
COMP
5
GND
6
EN1
V+
VP
LX
PGND
12
V+
VP
CTRL
1
2
3
TOP VIEW
MAX1582
OUT1
0.1碌F
2 TO 4 LEDS
MAIN
DISPLAY
11
ANALOG OR
DIRECT PWM
DIMMING
CTRL
PGND
EN1
EN2
COMP
CS
GND
OUT2
MAX1582
2 TO 3 LEDS
SUB-
DISPLAY
0.022碌F
7.5鈩?/div>
4mm x 4mm
THIN QFN
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
LX
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