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부품번호 MAX1582ETC 기능
기능 High-Efficiency / 26V Step-Up Converter for White LED Main and Subdisplay Backlighting
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MAX1582ETC 데이터시트, 핀배열, 회로
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 7.5
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.




MAX1582ETC pdf, 반도체, 판매, 대치품
High-Efficiency, 26V Step-Up Converter
for White LED Main and Subdisplay Backlighting
ELECTRICAL CHARACTERISTICS (continued)
(VV+ = +3.0V, VOUT1 = +20V, L1 = 22µH, COUT = 0.1µF, CCOMP = 0.022µF, RSENSE = 7.5, VCTRL = +1.5V, EN1 = EN2 = V+, TA =
-40°C to +85°C, unless otherwise noted.) (Notes 1, 3)
PARAMETER
CONDITIONS
MIN MAX UNITS
Maximum Duty Cycle
CTRL = V+, CS = GND
91 %
N-CHANNEL SWITCH
LX On-Resistance
2.25
LX Current Limit
Duty cycle = 90%
450 950 mA
Note 1: Limits are 100% production tested at TA = +25°C for UCSP parts. Limits over the entire operating temperature range are
guaranteed by design and characterization but are not production tested.
Note 2: The minimum output voltage is the input voltage minus the forward voltage drop of the Schottky diode:
VOUT(MIN) = VV+ - VDIODE
Note 3: Specifications to -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(See the Typical Applications Circuit, VV+ = VVP = 3.6V, ILED = 15mA, L1 = 22µH, COUT1 = 0.1µF, CCOMP = 0.022µF, RSENSE = 7.5,
VCTRL = 1.5V, 4 LEDs, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LED CURRENT
(vs. NUMBER of LEDs)
100
90
6 LEDs
80
70
4 LEDs
60 2 LEDs
50
40
0
5 10 15
LED CURRENT (mA)
20
INPUT RIPPLE vs. INDUCTANCE
40
35
30
25
20
15
10
5
0
0 5 10 15 20 25 30 35 40 45 50
INDUCTANCE (µH)
EFFICIENCY vs. LED CURRENT
(vs. INPUT VOLTAGE)
100
90 2.7 VIN
80
70 3.6 VIN
60 4.2 VIN
50
40
0
5 10 15
LED CURRENT (mA)
20
INPUT RIPPLE SPECTRUM
6
5
4
3
2
1
0
0 1 2 3 4 5 6 7 8 9 10
FREQUENCY (MHz)
EFFICIENCY vs. LED CURRENT
(vs. INDUCTANCE)
100
90 22µH
10µH
80
70 47µH
4.7µH
60
50
40
0
5 10 15
LED CURRENT (mA)
20
LED CURRENT vs. DIRECT-PWM
DIMMING DUTY CYCLE
25
20
15
10
5
VCTRL = SQUARE WAVE
200Hz < FREQ < 200kHz
0
0 10 20 30 40 50 60 70 80 90 100
DIRECT-PWM DIMMING DUTY CYCLE (%)
4 _______________________________________________________________________________________

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MAX1582ETC 전자부품, 판매, 대치품
High-Efficiency, 26V Step-Up Converter
for White LED Main and Subdisplay Backlighting
between the input and the LEDs through the inductor
and Schottky diode. To ensure the LEDs remain off
when the MAX1582 is in shutdown, the minimum input
forward voltage of the LED array must exceed the maxi-
mum input voltage. Typically, the leakage current
through the LEDs in shutdown is less than 1µA.
Soft-Start
The MAX1582 attains soft-start by charging CCOMP
gradually with a current source. When VCOMP rises
above 1.25V, the internal MOSFET begins switching,
but at a reduced duty cycle. When VCOMP rises above
2.25V, the duty cycle is at its maximum.
Overvoltage Protection
OVLO occurs when VOUT1 rises above 27V. The protec-
tion circuitry stops the internal MOSFET from switching
and causes VCOMP to decay to GND. The device
comes out of OVLO and into soft-start when VOUT1 falls
below 25V.
Design Procedure
Adjusting LED Current
Adjusting the MAX1582s output current changes the
brightness of the LEDs. The LED current is set by the
voltage at CTRL (VCTRL) and the sense-resistor value
(RSENSE):
ILED
=
VCTRL
10 × RSENSE
The VCTRL voltage range for adjusting output current is
0 to +1.62V. To set the maximum current, calculate
RSENSE when VCTRL is at its maximum as follows:
RSENSE
=
1.62
10 × ILED(MAX)
Power dissipation in RSENSE is typically less than 5mW;
therefore, a standard chip resistor is sufficient.
PWM Dimming Control
CTRL is also used as a digital input, allowing LED
brightness control with a logic-level PWM signal
applied directly to CTRL. The frequency range is from
200Hz to 200kHz, while 0% duty cycle corresponds to
zero current and 100% duty cycle corresponds to full
current. The error amplifier and compensation capaci-
tor form a lowpass filter, so PWM dimming results in DC
current to the LEDs without any additional RC filters
required.
Capacitor Selection
The exact values of input and output capacitors are not
critical. The typical value for the input capacitor is
2.2µF, and the typical value for the output capacitor is
0.1µF. Larger value capacitors can be used to reduce
input and output ripple, but at the expense of size and
higher cost.
CCOMP stabilizes the converter and controls soft-start.
Connect a 0.022µF capacitor from COMP to GND. The
minimum value for CCOMP is COUT / 10. The soft-start
time is found from:
tSS
=
CCOMP
×
1.25V
 5µA 
Inductor Selection
Recommended inductor values range from 10µH to
47µH. A 22µH inductor optimizes the efficiency for most
applications, while maintaining a low 15mVP-P input rip-
ple. With input voltages near 5V, a larger value of induc-
tance may be more efficient. To prevent core saturation,
ensure that the inductor saturation current rating exceeds
the peak inductor current for the application. Calculate
the peak inductor current with the following formula:
IPEAK
VOUT1(MAX) × ILED(MAX)
0.8 × VIN(MIN)
+
VIN(MIN) × 0.8µs
2× L
Schottky Diode Selection
The MAX1582s high switching frequency demands a
high-speed rectification diode (D1) for optimum
efficiency. A Schottky diode is recommended due to its
fast recovery time and low forward-voltage drop.
Ensure that the diodes average and peak current
rating exceeds the average output current and peak
inductor current. In addition, the diodes reverse break-
down voltage must exceed VOUT1. The RMS diode
current can be calculated from:
IDIODE(RMS) IOUT1 × IPEAK
Applications Information
PC Board Layout
Due to fast-switching waveforms and high-current
paths, careful PC board layout is required. An evalua-
tion kit (MAX1582EVKIT) is available to speed design.
_______________________________________________________________________________________ 7

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부품번호상세설명 및 기능제조사
MAX1582ETC

High-Efficiency / 26V Step-Up Converter for White LED Main and Subdisplay Backlighting

Maxim Integrated
Maxim Integrated

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