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Part Number: MAX1582
Description: The MAX1582 drives up to six white LEDs in series with a constant current to provide display backlighting for two (main...
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MAX1582
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DataSheet
General Description
MAX1582 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.
MAX1582 Maximum Ratings
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 (VV+ + 0.3V)
ILX ....................................................................................................1ARMS
Continuous Power Dissipation (TA = +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
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 (VV+ + 0.3V)
ILX ....................................................................................................1ARMS
Continuous Power Dissipation (TA = +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
MAX1582 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 15mVP-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
Illumination
Lights Up Two LED Sections for Main and
Subdisplays
Up to 84% Efficiency
Internal High-Power, 30V MOSFET
Low 15mVP-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 Typical Application
Cell Phones with One or Two Displays
Smart Phones, Palmtops, and Wireless
Handhelds
Other Hand-Held Devices with Dual Displays
Smart Phones, Palmtops, and Wireless
Handhelds
Other Hand-Held Devices with Dual Displays
MAX1582 Connection Diagram
MAX1582
PDF/DataSheet Download
- Datasheet: MAX1582
- File Size: 237765 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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