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PDF MAX1582ETC Data sheet ( Hoja de datos )
| Número de pieza | MAX1582ETC | |
| Descripción | High-Efficiency / 26V Step-Up Converter for White LED Main and Subdisplay Backlighting | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2783; Rev 0; 4/03
EVAALVUAAILTAIOBNLEKIT 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 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
Typical Application Circuit
INPUT
2.6V TO 5.5V
22µH
2.2µF
ANALOG OR
DIRECT PWM
DIMMING
0.022µF
V+ LX
VP MAX1582
OUT1
CTRL
PGND
0.1µF
2 TO 4 LEDS
EN1 OUT2
EN2
2 TO 3 LEDS
COMP
CS
GND 7.5Ω
MAIN
DISPLAY
SUB-
DISPLAY
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
Ordering Information
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
*EP = Exposed paddle.
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW
12 11 10
V+ 1
VP 2
CTRL 3
MAX1582
9 OUT2
8 CS
7 EN2
456
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’s website at www.maxim-ic.com.
1 page  
High-Efficiency, 26V Step-Up Converter
for White LED Main and Subdisplay Backlighting
Typical Operating Characteristics (continued)
(See the Typical Applications Circuit, VV+ = VVP = 3.6V, ILED = 15mA, L1 = 22µH, COUT1 = 0.1µF, CCOMP = 0.022µF, RSENSE = 7.5Ω,
VCTRL = 1.5V, 4 LEDs, TA = +25°C, unless otherwise noted.)
SWITCHING WAVEFORMS
MAX1582 toc07
VIN
10mV/div
VOUT
100mV/div
500ns/div
VLX
10V/div
DIRECT-PWM DIMMING
MAX1582 toc08
VCTRL
32kHz
1V/div
0V
VIN
50mV/div
IIN
50mA/div
0mA
VIN = 3.8V Li+ BATTERY
50µs/div
VOUT
5V/div
0V
PIN
QFN UCSP
1 A1
2 A2
3 A3
4 A4
5 B4
6 C4
7 D4
8 D3
9 D2
10 D1
11 C1
12 B1
EP —
Pin Description
NAME
FUNCTION
V+
VP
CTRL
COMP
GND
EN1
EN2
CS
OUT2
OUT1
LX
PGND
EP
Input Voltage Supply. Input voltage range is 2.6V to 5.5V. Connect a 2.2µF capacitor from V+ to
PGND.
High-Current Input Supply. Connect to V+.
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.
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.
Ground. Connect to PGND at a single point near the IC.
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.
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.
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.
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.
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.
Inductor Connection. During shutdown, this pin is high impedance.
Power Ground. Connect to GND at a single point near the IC.
Exposed Paddle. Connect directly to GND and PGND under the IC.
_______________________________________________________________________________________ 5
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