MAX158 Maxim, MAX158 Datasheet
MAX158
Manufacturer Part Number
MAX158
Description
High-Efficiency / 26V Step-Up Converter for White LED Main and Subdisplay Backlighting
Manufacturer
Maxim
Datasheet
1.MAX158.pdf
(10 pages)
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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
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
(UCSP™) and 12-pin thin QFN packages.
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.
DIRECT PWM
2.2µF
ANALOG OR
0.022µF
DIMMING
2.6V TO 5.5V
for White LED Main and Subdisplay Backlighting
INPUT
Cell Phones with One or Two Displays
Smart Phones, Palmtops, and Wireless
Handhelds
Other Hand-Held Devices with Dual Displays
Typical Application Circuit
V+
VP
CTRL
EN1
EN2
COMP
MAX1582
________________________________________________________________ Maxim Integrated Products
22µH
GND
PGND
General Description
OUT1
OUT2
CS
LX
High-Efficiency, 26V Step-Up Converter
0.1µF
Applications
2 TO 4 LEDS
2 TO 3 LEDS
✕
7.5Ω
4 chip-scale
MAIN
SUB-
DISPLAY
DISPLAY
DSON
o Accurate Current Regulation for Uniform
o Lights Up Two LED Sections for Main and
o Up to 84% Efficiency
o Internal High-Power, 30V MOSFET
o Low 15mV
o Flexible Dimming Control
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
*EP = Exposed paddle.
UCSP is a trademark of Maxim Integrated Products, Inc.
MAX1582ETC
M AX 1582E BE - T -40°C to +85°C 16 UCSP-16
Pin Configurations continued at end of data sheet.
Illumination
Subdisplays
QFN (4mm
Analog DAC Controlled
Direct-Digital PWM (No RC Required)
from 200Hz to 200kHz
PART
TOP VIEW
P-P
✕
CTRL
-40°C to +85°C 12 Thin QFN-EP*
TEMP RANGE PIN-PACKAGE
4mm) Packages
VP
V+
Input Ripple
1
2
3
Ordering Information
✕
4mm x 4mm
12
4
THIN QFN
2.1mm
MAX1582
Pin Configurations
11
5
10
6
✕
0.61mm) and Thin
9
8
7
OUT2
CS
EN2
Features
1582EBE
MARK
AACE
TOP
1
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