MAX8901A
Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN Package
Drive a String of 2 to 6 WLEDs for 1.5in to 4in LCD Backlighting Used in Battery Operated Devices
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Overview
Features and Benefits
- Cost-Effective and Flexible Solution for Wide Range of Backlighting Applications
- Supplies from 2 to 6 WLEDs with 1.3% LED Current Accuracy
- 2.6V to 5.5V Input Voltage Range
- Fixed-Frequency Operation
- Flexible Dimming Control
- Direct PWM Dimming (MAX8901A)
- 32-Step, Single-Wire Serial Dimming (MAX8901B)
- Protection Features Improve System Reliability
- WLED Overvoltage Protection (25V typ)
- Internal Soft-Start and Thermal Shutdown
- Input Undervoltage Lockout
- Input Overvoltage Lockout
- High Efficiency Extends Battery Life
- Up to 91% Efficiency
- 0.01µA (typ) Shutdown Current
- No WLED Current in Shutdown
- 8-Pin, 2mm x 2mm TDFN Package Saves Space
Product Details
The MAX8901A/MAX8901B step-up converters drive from two to six series-connected white LEDs (WLEDs) with constant current to provide uniform WLED intensity for LCD backlighting in cell phones, PDAs, and other handheld devices. The MAX8901_ operate at a fixed 750kHz (typ) switching frequency, allowing for tiny external components, and are optimized for the highest possible efficiency over the full 1-cell Li+/Li-Poly battery range.
These converters use a single input (ON) to enable the IC and to control WLED intensity. The MAX8901A requires a direct PWM input to regulate WLED intensity with the WLED current proportional to the PWM duty cycle. The MAX8901B uses single-wire, serial-pulse dimming that reduces the WLED intensity in 32 linear steps. Full-scale WLED current for serial-pulse dimming is 24.75mA (MAX8901B, 0.75mA/step).
The MAX8901_ feature an internal soft-start to eliminate inrush currents during startup, input overvoltage protection, WLED overvoltage protection, and a shutdown mode with 0.01µA (typ) shutdown current. No WLED current is present in shutdown provided the WLED forward voltage is greater than the input supply voltage. Additional features include undervoltage lockout (UVLO) and thermal shutdown.
The MAX8901_ are available in tiny 8-pin, 2mm x 2mm TDFN-EP packages (0.8mm max height).
Applications
- Cellular Phones
- Digital Cameras
- Display Backlight (from 2 to 6 WLEDs)
- MP3 and Portable Media Players
- PDAs and Smartphones
- Portable Navigation Devices
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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