Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX16819/MAX16820, high-efficiency LED drivers
Edited by the Electronicstalk Editorial Team on 12 February 2007
MAX16819/MAX16820, high-efficiency LED
drivers
Maxim Integrated Products introduces the MAX16819/MAX16820, high-efficiency LED drivers for architectural, industrial, and automotive lighting applications.
Maxim Integrated Products introduces the MAX16819/MAX16820, high-efficiency LED drivers for architectural, industrial, and automotive lighting applications that make use of high-brightness light-emitting diodes (HB LEDs) The MAX16819/MAX16820 HB LED drivers require just one external MOSFET and only a few passive components to power LEDs that need up to 3A of current
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Each device is capable of delivering from 1W to more than 25W of output power with up to 94% efficiency, while driving as many as six white LEDs connected in series.
Packaged in a tiny 3x3mm TDFN, these devices are the smallest LED drivers to provide LED-driver designs with such a wide power range.
Moreover, a high-voltage current-sense amplifier and up to 2MHz switching frequency further reduce space and component-count requirements.
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These highly integrated devices minimise power dissipation, increase reliability, and reduce manufacturing costs, making them ideal for light sources such as the energy-efficient LED MR16 (an alternative to the traditional halogen MR16) and front and rear automotive lighting (RCL, DRL, and fog/low-beam lights).
Unlike the general-purpose buck controllers most commonly used to power HB LEDs, the MAX16819/MAX16820 LED drivers employ hysteretic control.
With this control technique, the drivers ensure rapid transient response and turn-on/-off times during PWM dimming, which translates into a wide dimming range (up to 5000:1) or the ability to dim at very high switching frequencies (up to 20kHz) using a dedicated DIM input.
Hysteretic control also offers a high level of input-supply rejection, as well as rapid response during LED dimming.
There is no control-loop compensation, which simplifies the design and further minimises component count.
High-side current sensing further differentiates these drivers from standard buck PWM controllers.
Because the voltage drop across the external sense resistor is only 200mV, the MAX16819/MAX16820 reduce power dissipation.
In addition, the high-side current sensing and integrated current-setting circuitry minimise the number of external components while delivering an LED current with +/-5% accuracy.
The MAX16819 and MAX16820 offer 30% and 10% LED current ripple, respectively, without the use of an output capacitor.
A wide input-voltage range (4.5V to 28V) allows the MAX16819/MAX16820 to be optimised for different input-voltage standards in architectural and ambient lighting, and ensures cold-start and load dump compliance in automotive applications.
These LED drivers are specified for the automotive temperature range (-40C to +125C) and are available in a lead-free, tiny, 3x3mm, 6-pin TDFN package with exposed pad.
Prices start at $0.58.
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