The MAX16833, MAX16833B, MAX16833C, MAX16833D, and MAX16833G are advanced LED drivers specifically designed for various topologies including boost, buck-boost, SEPIC, flyback, and high-side buck configurations. These drivers come equipped with an external p-channel dimming driver that enables efficient control of an LED string connected in series. This feature ensures precise and rapid PWM current switching for LEDs, minimizing transient overvoltage or undervoltage issues. Besides PWM dimming, the IC also supports analog dimming via the ICTRL pin, which accepts a DC input signal. The LED current is sensed on the high side of the LED string.
By connecting a single resistor from the RT/SYNC pin to ground, users can set the switching frequency between 100kHz and 1MHz. Alternatively, an external clock signal capacitively coupled to RT/SYNC allows synchronization with an external clock source. For certain models like the MAX16833/C/G, this switching frequency can be utilized for spread spectrum applications. The MAX16833B/D offers a 1.64V reference voltage with a 2% tolerance.
Operating within a wide supply range of 5V to 65V, the IC features a 3A sink/source gate driver capable of efficiently driving power MOSFETs in high-power LED driver applications. Additional features include a fault indicator output (FLT) for detecting short circuits or overheating conditions, and an overvoltage protection sense input (OVP). The high-side current sensing is combined with a p-channel dimming MOSFET, allowing the positive terminal of the LED string to be safely shorted to either the positive or negative input without causing any damage. This is a unique advantage of the IC.
Key advantages and features of the MAX16833 include:
- Integrated bill of materials to simplify high-brightness LED driver designs, reducing both space usage and costs.
- A wide input voltage range from +5V to +65V, with a maximum boost output of 65V.
- An integrated high-side pMOS dimming MOSFET driver, enabling a simple single-wire connection to the LED.
- The ICTRL pin for analog dimming.
- Built-in high-side current sense amplification.
- Full-scale high-side current detection voltage of 200mV.
- Efficient optimization of efficiency, board space, and input operating range for boost, SEPIC, and buck-boost single-channel LED drivers.
- A precise 1.64V reference voltage with 2% accuracy (for MAX16833B/D).
- Programmable operating frequency (100kHz to 1MHz) with synchronization capabilities.
- Frequency jitter for spread spectrum applications (for MAX16833/C/G).
- A thermally enhanced 5mm x 4.4mm, 16-pin TSSOP package with an exposed pad.
- Enhanced protection features and a wide temperature range (-40°C to +125°C) for improved system reliability, including overvoltage and overtemperature protection.
- A fault indicator output.
Applications for the MAX16833 include automotive exterior lighting such as high beams, low beams, signaling lights, position lights, daytime running lights (DRL), fog lights, and adaptive headlight assemblies. It is also suitable for commercial, industrial, and architectural lighting solutions.
For a more detailed understanding, refer to Figures 1 through 5, which provide functional block diagrams and simplified working circuits of the MAX16833B/D, MAX16833G, and an application circuit diagram.
Evaluation Board MAX16833 EVK:
The MAX16833 evaluation kit (EV kit) serves as a reliable platform for evaluating the MAX16833 high-voltage HB LED driver with integrated high-side current sensing. Configured for both boost and buck-boost setups, the EV kit operates from a 5V to 18V DC supply voltage. It is designed to deliver up to 1A of current to a string of LEDs, with the total LED string voltage ranging from 3V to 36V. The anode of the LED string connects to the LED+ terminal, while the cathode can connect to PGND (boost mode) or LED- (buck-boost mode). In boost mode, the input voltage must not exceed the LED string voltage.
The EV kit's PCB comes pre-installed with the MAX16833AUE+, a frequency jitter version. Additionally, it features a pin-compatible MAX16833BAUE+, which is the reference voltage output version.
Main features of the Evaluation Board MAX16833 EVK include:
- Configured for boost and buck-boost operations.
- Supports analog dimming control.
- Verified PCB layout for ease of use.
- Fully assembled and tested.
Refer to Figure 6 for the EVK circuit diagram and Figures 7 and 8 for the PCB design and bill of materials.
This comprehensive setup makes the MAX16833 EVK an excellent tool for engineers looking to explore the capabilities of the MAX16833 in real-world applications.
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