The MAX16832A/MAX16832C step-down constant-current high-brightness LED (HB LED) drivers provide a cost-effective design solution for automotive interior/exterior lighting, architectural and ambient lighting, LED bulbs, and other LED illumination applications. The MAX16832A/MAX16832C operate from a +6.5V to +65V input voltage range. A high-side current-sense resistor adjusts the output current up to 700mA, and a dedicated pulse-width modulation (PWM) input enables pulsed LED dimming over a wide range of brightness levels. These devices are well suited for applications requiring a wide input voltage range. The high-side current sensing and an integrated current-setting circuitry minimize the number of external components while delivering an average output current with ±3% accuracy. A hysteretic control method ensures excellent input supply rejection and fast response during load transients and PWM dimming. The MAX16832A allows 10% current ripple, and the MAX16832C allows 30% current ripple. Both devices operate up to a 2MHz switching frequency, thus allowing the use of small-sized components. The MAX16832A/MAX16832C offer an analog dimming feature that reduces the output current by applying an external DC voltage below the internal 2V threshold voltage from TEMP_I to GND. TEMP_I also sources 25µA to a negative temperature coefficient (NTC) thermistor connected between TEMP_I and GND, thus providing an analog thermal-foldback feature that reduces the output current when the current reaches the rated value.
The MAX16832A and MAX16832C are step‑down constant‑current high‑brightness LED drivers that operate from a +6.5 V to +65 V input range and deliver up to 700 mA of output current. They feature an on‑board 65 V, 0.45 A power MOSFET, high‑side current‑sense resistor for accurate current programming, and a dedicated PWM input for dimming.
These devices are suited for automotive interior/exterior lighting, architectural and ambient lighting, and LED bulb applications. They include thermal‑foldback, thermal‑shutdown, analog dimming, and UVLO protection, and can switch at frequencies up to 2 MHz, enabling the use of small inductors in space‑constrained designs.
| Input Voltage Range | 6.5 V to 65 V |
|---|---|
| Maximum Output Current | 700 mA |
| Switching Frequency | up to 2 MHz |
| Operating Temperature Range | -40 °C to +125 °C |
| Current Ripple (MAX16832A) | 10 % |
| Current Ripple (MAX16832C) | 30 % |
| LED Current Accuracy | +3 % |
| Integrated MOSFET | On‑Board 65 V, 0.45 A Power MOSFET |
It operates from 6.5 V up to 65 V.
The LED current is programmed with a high‑side current‑sense resistor placed between the IN and CS pins.
Both devices can switch at frequencies up to 2 MHz.