MAXIM MAX16838AUP/V+T

The MAX16838 is a dual-channel LED driver integrating a DC-DC switching boost regulator and two 150mA current sinks. A current-mode switching DC-DC controller provides the required voltage for two strings of HB LEDs. The MAX16838 accepts a wide input voltage range of 4.75V to 40V and can directly withstand automotive load-dump events. For a 5V ±10% input voltage, connect VIN to VCC. The wide input range enables powering HB LEDs for small to medium LCD displays in automotive and display backlighting applications.

The internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates over an adjustable frequency range of 200kHz to 2MHz. Current-mode control provides fast transient response and simplifies loop compensation. The MAX16838 also features an adaptive output voltage regulation scheme to minimize power dissipation in the LED current sink paths. The MAX16838 can be used in conjunction with the MAX15054 to implement a buck-boost LED driver with two integrated current sinks.

Channel current is adjustable from 20mA to 150mA via an external resistor. The external resistor sets both channels to the same current value. The device allows two strings to be connected in parallel to achieve a maximum current of 300mA in a single channel. The MAX16838 also features pulse dimming control via a logic input (DIM), with a minimum pulse width as low as 1Fs on both channels.

The MAX16838 includes output overvoltage protection, open-circuit LED detection, short-circuit LED detection, and overtemperature protection. The device operates over a temperature range of -40°C to +125°C. The MAX16838 is available in a 20-pin TSSOP package and a 4mm x 4mm, 20-pin TQFN package.

• Integrated 2-channel, 20mA to 150mA linear LED current sink
• Boost or SEPIC power topology for maximum flexibility
• Adaptive voltage optimization to minimize power dissipation in linear current sink
• 4.75V to 40V or 5V ±10% input operating voltage range
• 5000:1 PWM dimming at 200Hz
• Open-drain fault indicator output
• LED open/short circuit detection and protection
• Output overvoltage and overtemperature protection
• Programmable LED current foldback at lower input voltages
• 200kHz to 2MHz resistor-programmable switching frequency with external synchronization
• Current mode control switching stage with internal slope compensation
• Enable input
• Thermally enhanced 20-pin TQFN (4mm x 4mm) and 20-pin TSSOP packages

• Automotive display backlighting
• LCD display backlighting
• Automotive lighting applications