LED Charge Pumps Get Smarter

Jan. 20, 2005
Five tri-mode, high-efficiency charge pumps for white LED backlight and color LED applications combine a load switch (13) and a high-efficiency (1.53 or 23) charge pump with an internal sensing circuit that monitors the required voltage on each consta

Five tri-mode, high-efficiency charge pumps for white LED backlight and color LED applications combine a load switch (13) and a high-efficiency (1.53 or 23) charge pump with an internal sensing circuit that monitors the required voltage on each constant current-sink input. The load switch and charge pump modes are set based on the input battery voltage and current sink input voltage. Advanced Analogic Technologies' AAT3151/2/3/6 products can drive four or six individual LEDs with a maximum current of 30 mA per channel. They use the company's proprietary single-wire control interface to control current level for the LED channels. Each device requires only four external components: two small 1-µF ceramic capacitors for the charge pump flying capacitors, one 1-µF ceramic input capacitor, and one 0.33- to 1-µF ceramic charge-pump output capacitor. Meanwhile, the AAT3129 charge pump provides a single current source to deliver a regulated current to drive red, green, and blue LEDs, which have dramatically different forward-voltage requirements, via three internal switches. The single-wire serial interface is used to enable, disable, and set the duty cycle of each internal MOSFET switch. The AAT3151 and AAT3152 devices, in 12-pin 3- by 3-mm DFNs, cost $1.74 and $1.70, respectively. The AAT3153 and AAT3156 parts, in 16-pin 4- by 4-mm QFNs, sell for $1.86 and $1.90. The AAT3129 devices, in 12-pin TSOPJWs, sell for $1.58. All prices are based on 1000-unit quantities.

Advanced Analogic Technologieswww.analogictech.com

Sponsored Recommendations

TTI Transportation Resource Center

April 8, 2024
From sensors to vehicle electrification, from design to production, on-board and off-board a TTI Transportation Specialist will help you keep moving into the future. TTI has been...

Cornell Dubilier: Push EV Charging to Higher Productivity and Lower Recharge Times

April 8, 2024
Optimized for high efficiency power inverter/converter level 3 EV charging systems, CDE capacitors offer high capacitance values, low inductance (< 5 nH), high ripple current ...

TTI Hybrid & Electric Vehicles Line Card

April 8, 2024
Components for Infrastructure, Connectivity and On-board Systems TTI stocks the premier electrical components that hybrid and electric vehicle manufacturers and suppliers need...

Bourns: Automotive-Grade Components for the Rough Road Ahead

April 8, 2024
The electronics needed for transportation today is getting increasingly more demanding and sophisticated, requiring not only high quality components but those that interface well...

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!