MAX8848Z
High-Performance Negative Charge Pump for 7 White LEDs in 3mm x 3mm Thin QFN
Achieves Industry's Highest Efficiency Using a Negative Charge Pump to Independently Drive 7 White LEDs
Part Details
- Negative 1x/1.5x Charge Pump
- Adaptive Current Regulators
- Independent Voltage Supply for Each LED
- 24mA to 0.1mA Serial-Pulse Dimming (MAX8848Y)
- 24mA to 0mA PWM Dimming (MAX8848Z)
- 2% (max) LED Current Accuracy, 1% (typ) Matching
- Low 120µA Quiescent Current
- Low 0.4µA Shutdown Current
- Inrush Current Limit
- Temperature Derating Function
- 16-Pin, 3mm x 3mm Thin QFN Packages
The MAX8848Y/MAX8848Z negative charge pumps drive up to 7 white LEDs with regulated constant current for display backlight applications. By utilizing an inverting charge pump and extremely low-dropout adaptive current regulators, these ICs achieve very high efficiency over the full 1-cell Li+ battery voltage range even with large LED forward voltage mismatch. The 1MHz fixed-frequency switching allows for tiny external components. The regulation scheme is optimized to ensure low EMI and low input ripple. The MAX8848Y/MAX8848Z include thermal shutdown, open- and short-circuit protection.
The MAX8848Y/MAX8848Z support independent LED on/off and dimming control. The MAX8848Y dimming ranges are pseudo-logarithmic from 24mA to 0.1mA and off in 32 steps. All devices include a temperature derating function to safely allow bright 24mA full-scale output current while automatically reducing current gradually to protect LEDs at high ambient temperatures above +60°C.
The MAX8848Y/MAX8848Z are available in 16-pin, 3mm x 3mm thin QFN packages.
Applications
- Cellular Phones
- PDAs, Digital Cameras, and Camcorders
- White LED Backlighting
Documentation
This is the most up-to-date revision of the Data Sheet.
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