OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX1582ETC+

P1-P3P4-P6P7-P9P10-P10
General Description
The MAX1582/MAX1582Y drive up to six white LEDs in
series with a constant current to provide display back-
lighting for two (main and sub-) displays in cell phones
and other handheld devices. This configuration elimi-
nates the need for ballast resistors and expensive fac-
tory calibration. The proprietary dual-output, step-up
pulse-width modulation (PWM) converter includes a low
R
DSON
n-channel MOSFET switch for high efficiency and
maximum battery life.
The MAX1582/MAX1582Y utilize 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 equipment. Integrated overvoltage protection (27V
for the MAX1582 and 18V for the MAX1582Y) 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
without 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/MAX1582Y are 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 Handheld Devices with Dual Displays
Features
♦ Accurate Current Regulation for Uniform
Illumination
♦ Lights Up Two LED Sections for Main and
Subdisplays
♦ Up to 84% Efficiency
♦ Internal High-Power, 30V MOSFET
♦ Low 15mV
P-P
Input Ripple
♦ Flexible Dimming Control
Analog DAC Controlled
Direct-Digital PWM (No RC Required)
from 200Hz to 200kHz
♦ Overvoltage Protection to Eliminate Zener Diode
♦ Constant 1MHz PWM Operation
♦ Low-Profile Inductor and Capacitors
♦ Soft-Start Eliminates Inrush Current
♦ 2.6V to 5.5V Input
♦ 0.01µA (typ) Shutdown Current
♦ Tiny UCSP (2.1mm
✕ 2.1mm ✕ 0.61mm) and Thin
QFN (4mm ✕ 4mm) Packages
MAX1582/MAX1582Y
High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2783; Rev 2; 8/05
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.
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
M A X1 5 8 2 E BE - T
-40°C to +85°C
16 UCSP-16
1582EBE
M AX 1582E BE + T
-40°C to +85°C
16 UCSP-16
1582EBE
MAX1582ETC
-40°C to +85°C 12 Thin QFN-EP*
AACE
MAX1582ETC+
-40°C to +85°C 12 Thin QFN-EP*
AACE
Pin Configurations
MAX1582
INPUT
2.6V TO 5.5V
2.2μF
0.022μF
0.1μF
V+
VP
CTRL
EN1
EN2
COMP
22μH
LX
OUT1
PGND
OUT2
CS
GND
2 TO 4 LEDS
MAIN
DISPLAY
2 TO 3 LEDS
SUB-
DISPLAY
7.5Ω
ANALOG OR
DIRECT PWM
DIMMING
Typical Application Circuit
MAX1582
MAX1582Y
1V+
TOP VIEW
2VP
3CTRL
OUT2
CS
EN2
9
8
7
12 11 10
456
PGND
LX
OUT1
COMP
GND
EN1
4mm x 4mm
THIN QFN
+
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configurations continued at end of data sheet.
*EP = Exposed paddle.
+Denotes lead-free package.
UCSP is a trademark of Maxim Integrated Products, Inc.
Ordering Information continued at end of data sheet.
MAX1582/MAX1582Y
High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
V+
= +3.0V, V
OUT1
= 20V, L1 = 22µH, C
OUT
= 0.1µF, C
COMP
= 0.022µF, R
SENSE
= 7.5Ω, V
CTRL
= +1.5V, EN1 = EN2 = V+, T
A
=
0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V+, VP, CTRL to GND............................................-0.3V to +6.0V
PGND to GND .......................................................-0.3V to +0.3V
LX, OUT1 to GND ...................................................-0.3V to +30V
OUT2 to GND .........................................................-0.3V to +14V
COMP, CS, EN1, EN2 to GND ....................-0.3V to (V
V+
+ 0.3V)
I
LX ....................................................................................................
1A
R
MS
Continuous Power Dissipation (T
A
= +70°C)
12-Pin Thin QFN (derate 16.9mW/°C above +70°C) ....1349mW
16-Pin UCSP (derate 6.5mW/°C above +70°C)..............518mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS
MIN TYP MAX
Supply Voltage 2.6 5.5 V
Undervoltage Lockout (UVLO)
Threshold
V+
rising or falling
2.10 2.38 2.55
V
UVLO Hysteresis 40 mV
Quiescent Current No switching, V
CTRL
= V
CS
= +0.25V
0.40 0.56
mA
T
A
= +25°C
0.01
1
Shutdown Supply Current EN1 = EN2 = GND, OUT1 = V+
T
A
= +85°C 0.1
µA
MAX1582 26 27 29
Overvoltage Lockout (OVLO)
Threshold (Rising)
MAX1582Y 17 18 19
V
MAX1582 2
OVLO Hysteresis
MAX1582Y 1.3
V
MAX1582, V
OUT1
= +26V, EN1 = EN2 = V+ 20 40 65
MAX1582Y, V
OUT1
= +16V, EN1 = EN2 = V+ 20 40 65
T
A
= +25°C 0.01
1
OUT1 Input Bias Current
OUT1 = V+, EN1 = EN2 = GND
T
A
= +85°C 0.05
µA
MAX1582
(V
V+
-
V
DIODE
)
25.5
Output Voltage Range (Note 2)
MAX1582Y
(V
V+
-
V
DIODE
)
17.0
V
ERROR AMPLIFIER
CTRL to CS Regulation V
CTRL
= +1.0V, V
V+
= +2.6V to +5.5V
0.095 0.100 0.106
V
T
A
= +25°C 0.01
1
CS Input Bias Current V
CS
= V
CTRL
/ 10
T
A
= +85°C
1
µA
CTRL Input Resistance 0 < V
CTRL
< +1V
290 500
780 kΩ
CS to COMP Transconductance V
COMP
= +1.0V 32 50 82 µS
OSCILLATOR
Operating Frequency
0.80
1.0
1.25
PWM mode 12
Minimum Duty Cycle
Pulse skipping 0
%
Maximum Duty Cycle CTRL = V+, CS = GND 91 94 %
MAX1582/MAX1582Y
High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
V+
= +3.0V, V
OUT1
= 20V, L1 = 22µH, C
OUT
= 0.1µF, C
COMP
= 0.022µF, R
SENSE
= 7.5Ω, V
CTRL
= +1.5V, EN1 = EN2 = V+, T
A
=
0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
N-CHANNEL SWITCH
LX On-Resistance
1.50 2.25
Ω
T
A
= +25°C
0.01
5
LX Leakage Current V
LX
= +28V
T
A
= +85°C
0.02
µA
LX Current Limit Duty cycle = 90%
450 650
950 mA
MAIN AND SUBDISPLAY ON/OFF SWITCHES
OUT1 to OUT2 On-Resistance EN1 = GND, EN2 = V+ 2.5 Ω
OUT2 to CS On-Resistance EN1 = V+, EN2 = GND 2.5 Ω
OUT1 to OUT2 Leakage Current
E N 1 = E N 2 = V + , V
OU T 1
= 25V , V
OU T 2
= + 9V , T
A
= + 85° C 0.05
µA
OUT2 to CS Leakage Current EN1 = EN2 = V+, V
OUT2
= 12V, V
CS
= 0, T
A
= +85°C
0.05
µA
EN1 and EN2 Logic Input Voltage
High
+2.6V < V
V+
< +5.5V 1.6 V
EN1 and EN2 Logic Input Voltage
Low
+2.6V < V
V+
< +5.5V 0.6 V
T
A
= +25°C
0.02
1
EN1 and EN2 Input Leakage V
V+
= V
EN1
= V
EN2
= +5.5V
T
A
= +85°C 0.1
µA
ELECTRICAL CHARACTERISTICS
(V
V+
= +3.0V, V
OUT1
= +20V, L1 = 22µH, C
OUT
= 0.1µF, C
COMP
= 0.022µF, R
SENSE
= 7.5Ω, V
CTRL
= +1.5V, EN1 = EN2 = V+, T
A
=
-40°C to +85°C, unless otherwise noted.) (Notes 1, 3)
PARAMETER CONDITIONS
MIN MAX
UNITS
Supply Voltage 2.6 5.5 V
Undervoltage Lockout (UVLO)
Threshold
V+
rising or falling
2.10 2.55
V
Quiescent Current No switching, V
C
= +0.25V
0.56
mA
MAX1582 26 29
Overvoltage Lockout (OVLO)
Threshold (Rising)
MAX1582Y 17 19
V
OUT1 Input Bias Current V
OUT1
= +26V, EN1 = EN2 = V+ 20 65 µA
ERROR AMPLIFIER
CTRL to CS Regulation V
CTRL
= +1.0V, V
V+
= +2.6V to +5.5V
0.093 0.107
V
CTRL Input Resistance 0 < V
CTRL
< +1.0V
290
780 kΩ
CS to COMP Transconductance V
COMP
= 1.0V 32 85 µS
OSCILLATOR
Operating Frequency
0.75 1.30
MHz
P1-P3P4-P6P7-P9P10-P10

MAX1582ETC+

Mfr. #:
Buy MAX1582ETC+
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers Step-Up Converter for White LED Main
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet