The MAX16831 is a current-mode, high-brightness LED (HBLED) driver designed to regulate the current of a single string of LEDs by controlling two external n-channel MOSFETs. The MAX16831 integrates all the features needed for a wide range of brightness control, fixed frequency HBLED drivers. The .MAX16831 can be configured as a buck, boost or buck-boost current regulator. Application circuit diagram of MAX16831 The above picture is the schematic diagram of the Maxim's MAX16831 reference design. The constant current part and the buck-boost part are two MOS tubes working separately, which can effectively improve the gray level adjustment capability, and can drive up to 20pcs 1W LED. If it is 3W LED power Up to 60W. I am confirming the actual driving situation, and news will be announced immediately! TVS Changzhou Changyuan Electronic Co., Ltd. , https://www.cydiode.com
The current mode with leading edge blanking simplifies the design of the control loop. Internal slope compensation keeps the current loop stable when the duty cycle exceeds 50%. The MAX16831 operates over a wide input voltage range and can withstand automotive load dumps. Events. Multiple MAX16831s can be synchronized to each other or to an external clock. The MAX16831 includes a floating luminance driver that drives the n-channel MOSFETs in series with the LED string for brightness control.
The MAX16831-based HBLED driver delivers over 90% efficiency in automotive applications. The MAX16831 also includes a gate driver that sources 1.4A and sinks 2.5A for driving in high-power LED driver applications. Switching MOSFETs, such as lamp assemblies, etc. Brightness control allows for a wide range of PWM dimming with frequencies up to 2 kHz. Dimming ratios of up to 1000:1 can be achieved at lower dimming frequencies.
The MAX16831 is available in a 32-pin thin QFN package with an exposed pad and operates from -40°C to +125°C automotive temperature.
Basic parameters:
Wide input range: 6V to 76V; integrated LED current sense differential amplifier; can drive n-channel MOSFET; with floating brightness drive capability; LED current accuracy: 5%; 200Hz on-chip ramp generator, can be synchronized to external PWM brightness signal; Programming switching frequency (125kHz to 600kHz), can be synchronized; output overvoltage, open load, LED short circuit, overheat protection; as low as 107mV LED current detection can improve efficiency; enable / turn off input, shutdown current is less than 45μA. 
The design concept of Maxim's company likes to externally install the MOS tube. The disadvantage is that the line is relatively complicated. The advantages can be adjusted as needed in the application design, and the higher power can be designed according to its actual ability.