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MAX1582EBE-T Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1582EBE-T Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 10 page 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 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 High-Efficiency, 26V Step-Up Converter for White LED Main and Subdisplay Backlighting ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 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. EVALU ATION KIT AVAIL ABLE 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 Pin Configurations MAX1582 INPUT 2.6V TO 5.5V 2.2 µF 0.022 µF 0.1 µF V+ VP CTRL EN1 EN2 COMP 22 µH LX OUT1 PGND OUT2 CS GND 2 TO 4 LEDS MAIN DISPLAY 2 TO 3 LEDS SUB- DISPLAY 7.5 Ω ANALOG OR DIRECT PWM DIMMING Typical Application Circuit MAX1582 1 V+ TOP VIEW 2 VP 3 CTRL OUT2 CS EN2 9 8 7 12 11 10 45 6 4mm x 4mm THIN QFN Pin Configurations continued at end of data sheet. *EP = Exposed paddle. UCSP is a trademark of Maxim Integrated Products, Inc. |
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