Maxim’s MAX16928 is an automotive TFT-LCD Display power solution with a boost converter and gate voltage regulator that integrates a boost converter, a 1.8V/3.3V regulator controller, and two gates Voltage regulators (one 28V provides 20mA, one negative gate voltage). High-power boost output up to 6W, output voltage up to 18V, operating frequency 2MHz, mainly used in car dashboards, information displays and navigation systems.
The MAX16928 is a highly integrated power supply for automotive TFT-LCD applications. The device integrates a boost converter, a 1.8V/3.3V regulator controller, and two gate voltage regulators. The device is available in several versions to meet the requirements of general automotive TFT-LCD power supplies. The boost converter uses spread spectrum modulation to reduce spikes and optimize EMI performance. The sequencing input (SEQ) allows flexibility in the sequencing of the positive and negative gate voltage regulators. A power good indicator (PGOOD) can indicate the failure of any one converter or regulator output. An integrated thermal shutdown circuit prevents the device from overheating. The MAX16928 is currently available in a 20-pin TSSOP package with exposed pads and operates over a -40NC to 105NC temperature range.
Figure 1 Typical application circuit diagram of MAX16928
Figure 2. Functional block diagram of the MAX16928 boost converter
MAX16928 Key Features
• High power (up to 6W) boost output voltage up to 18V
• 1.8V or 3.3V regulator external NPN Transistor, 500mA available
• A positive gate voltage regulator capable of outputting 20mA at 28V
• A negative gate voltage regulator
• Can work at 2.2MHz
• Flexible independent sequences
• True Shutdown boost converter
• Internal soft start
• Thermal shutdown
• Can work in -40NC~105NC temperature range
• AEC-Q100 compliant
• Car dashboard
• Car central information display
• Car navigation system
MAX16928 Evaluation Kit
The MAX16928 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that provides the required voltages and functions for automotive thin-film transistors (TFTs) and liquid crystal displays (LCDs). The evaluation board includes a boost converter and 3.3V regulator controller with external NPN transistors, two gate voltage regulators, a single-stage positive charge pump, and a single-stage negative charge pump. The evaluation board has an input operating voltage of 4.5V~5.5V and is optimized for automotive TFT-LCD applications.
Its boost converter is configured for a 12V output and provides a minimum of 400mA. The output of the regulator controller is 3.3V and provides a minimum current of 500mA. The positive gate voltage regulator provides 18V output, while the negative gate voltage regulator provides -5.9V.
Figure 3 MAX16928 EV kit circuit diagram
Figure 4. MAX16928 evaluation board PCB layout. Agilent introduces a new family of products for radar and defense electronics test and measurement.
Key Features of the MAX16928 EV Kit
• 4.5V~5.5V input range
•The output voltage:
– 12V output at 400mA (boost converter)
– 3.3V output at 500mA (regulator controller)
-18V output (positive gate voltage regulator)
– -5.9V output (negative gate voltage regulator)
• Can work at high frequency
– 2.2MHz (boost converter)
• Single stage positive/negative charge pump
• Proven PCB layout
• Fully assembled and tested