Click here for production status of specific part numbers. MAX16923 Automotive 4-Output Display Power Solution with Watchdog General Description Benefits and Features The MAX16923 is a 4-channel power-management IC de- High Integration signed to accommodate the main rails used in modern Complete Display Power Solution from Automotive automotive TFT displays. The MAX16923 and the Battery MAX20069 TFT power supply and LED backlight driver One High-Voltage 2.1A Buck Converter (5V or combine to provide a two-chip solution to all automotive 3.3V) display power supply requirements. One High-Voltage 100mA Low-I Linear Regulator Q (3.3V) The MAX16923 integrates a high-voltage buck converter One Low-Voltage 1.6A Buck Converter (3.3V, 1.8V, that transforms battery voltages into a 5V or 3.3V interme- 1.2V, or 1.1V) diate rail. In addition, a high-voltage, always-on, low qui- One Low-Voltage Linear Regulator (3.3V, 1.8V, escent current linear regulator supplies power at 3.3V. 1.5V, or 1.0V) The low-voltage section consists of a fully-integrated DC/ MAX16923GTPB: 75mA DC converter and an LDO running off the intermediate rail. MAX16923GTPC/MAX16923GTPE: 175mA Section output power is available in several low-voltage All other variants: 180mA combinations (see the Ordering Information table). In ad- Power-Good Outputs dition, an integrated watchdog timer guards against run- Integrated Watchdog Timer away code. Robust and Low EMI A single START control pin initiates the start-up sequence, Programmable Switching Frequency thereby simplifying device control. The MAX16923 s ex- Internal Spread Spectrum Oscillator ternal pMOSFET control block allows battery voltage to Slew-Rate Controlled Switching be switched to a downstream device, such as a backlight Thermal Shutdown Protection boost converter. Compact TQFN20 4mm x 4mm Package The MAX16923 is available in a TQFN package and oper- ates in the -40C to 105C temperature range. Ordering Information appears at end of datasheet. Applications Simplified Block Diagram Infotainment Displays BATT PGB WDI WAKE Central Information Displays BSTB LDO1 Instrument Clusters HV LDO PG1 HIGH- WATCH VOLTAGE LX -DOG BUCK FIN BIAS PGATE RT OSC. PGATE CONTROL V5 LOW- LDO2 LV LDO LXC VOLTAGE BUCK PGND TEMP SENSOR SEQUENCING V33 & PGOOD START CONTROL MAX16923MAX16923 GND 19-100619 Rev 3 10/19MAX16923 Automotive 4-Output Display Power Solution with Watchdog 2. Keep the high-current paths short, especially at the ground terminals. This practice is essential for stable, jitter-free operation. The high current pathconsisting of the input capacitor, the MAX16923 internal FETs, the inductor, the external diode, and the output capacitorshould be as short as possible. 3. Keep the power traces and load connections short. This practice is essential to achieving high efficiency. Use thick copper PCBs (2oz as opposed to 1oz) to enhance full-load efficiency. 4. Place the BIAS bypass capacitor as close as possible to the BIAS pin. 5. Refer to the MAX16923EVKIT evaluation kit for an example of an optimal layout template. Typical Application Circuits MAX16923A - HV Buck Operating at 400KHz Battery Backlight Input Circuit 10mF 0.1mF 20kW BSTB BATT PGATE LDO1 3.3V, always on 0.1mF 22mF 10mH 5V LX BIAS 3x22mF SBR3U60P 1mF LDO2 3.3V 10mF V5 MAX16923MAX16923 10kW RT 2.2mH PG1 3.3V LXC PGOOD 22mF System V33 PGB Interface START PGND FIN GND WAKE WDI www.maximintegrated.com Maxim Integrated 19