Advanced Analogic Technologies has developed two advanced Power Management ICs designed specifically for driving and controlling the brightness of up to six white LEDs used to backlight colour LCDs used in mobile phones, smart-phones and PDAs, etc. The AAT3113 and AAT3114 are low noise, constant frequency charge pump ICs, that use fractional (1,5 X) conversion to optimise efficiency in white LED applications.
The devices can be used to produce current levels of up to 20 mA for each output, from a 2,75 to 5,5 V battery input, with a minimum of external components. These devices use only four small (0805), 1 µF ceramic capacitors, and are ideally suited for use in battery-powered applications.
Unlike the common red LEDs, white LEDs require a much higher forward voltage in order for current to flow. In many portable applications, a single cell Lithium Ion battery is the battery of choice. However, during its discharge cycle, the battery voltage drops below the voltage necessary for diode conduction, necessitating the need of a charge pump boost converter. The AAT3113/4 can provide this function as well as regulate the current for uniform brightness. For higher current outputs, each of the output channels can be paralleled to produce up to 120 mA of constant current.
A single wire, serial digital input pin is provided to enable, disable and set the LED drive current. Thirty-two levels of current are obtainable on a logarithmic scale, allowing the brightness to be increased linearly. Unlike other LED driver chips, which use additional components to PWM the output, once the brightness level has been programmed, no further data input is required until a new brightness level is desired. Coupled with the built in soft start, this reduces noise and increases efficiency. When shutdown the device only consumes 1 µA of supply current.
Power efficiency and robustness in electronics design
Power Electronics / Power Management
Mouser Electronics recently announced a new eBook in collaboration with Analog Devices highlighting essential strategies for optimising power systems.
Read more...USB Type-C-powered controllers Future Electronics
Power Electronics / Power Management
Diodes Incorporated has released two USB Type-C PD 3.1 extended power range sink controllers that can be embedded into battery-powered devices.
Read more...Multicell battery monitoring Altron Arrow
Power Electronics / Power Management
The LTC6811 from Analog Devices is a multicell battery stack monitor that measures up to 12 series connected battery cells with a total measurement error of less than 1,2 mV.
Read more...Full telemetry in tiny DC-DC converters RS South Africa
Power Electronics / Power Management
The FS160* series of µPOL DC-DC converters from TDK all offer full telemetry, provide increased performance, and are remarkable for extraordinary power density in the smallest sizes.
Read more...Power IC supplies 1650 W EBV Electrolink
Power Electronics / Power Management
Power Integrations has announced a two-fold increase in power output from the HiperLCS-2 chipset with the new device now being able to deliver up to 1650 W of continuous output power.
Read more...High-voltage step-down DC-DC converter Altron Arrow
Power Electronics / Power Management
The MAX17793 is a high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operating over an input voltage range of 3 to 80 V.
Read more...High-voltage contactors RS South Africa
Power Electronics / Power Management
TDK Corporation has announced two new additions to its high-voltage contactor portfolio for harsh environments: the HVC43MC with integrated mirror contact and the HVC45 with enhanced short-circuit current handling capability.
Read more...Chokes rated at 36 A RS South Africa
Power Electronics / Power Management
TDK Corporation has launched the EPCOS SurfIND series, a new range of current-compensated ring core double chokes for high currents and surface mounting.
Read more...RF arrestor provides robust protection RFiber Solutions
Power Electronics / Power Management
NexTek’s range of coaxial RF surge and lightning arrestors are designed and built to provide robust protection for any radio or coaxial RF transmission application.
Read more...Wide-Bandgap Developer Forum 2025
Power Electronics / Power Management
To give designers the ultimate in design flexibility, the entire range of WBG power semiconductors will be provided including discretes, modules, and highly integrated solutions ranging from 40 V to 700 V for GaN and 400 V to 3,3 kV for SiC.
printer friendly version