Maxim's MAX16928 is a highly integrated automotive TFT-LCD display power supply that integrates a boost converter (up to 6W, output up to 18V), a 1.8V/3.3V regulated controller (500mA current) and two gates Extreme voltage regulator, the positive gate voltage regulator can provide 20mA current at 28V, high frequency 2.2MHz operation, provide soft start and over temperature shutdown function. Mainly used in car dashboard, car center information Display and car navigation system. This article describes the main features of the MAX16928, block diagram, positive output and negative output voltage multi-level charge pump circuit and typical application circuit.
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Automotive TFT-LCD Power Supply with Boost Converter and Gate Voltage Regulators
The MAX16928 is a highly integrated power supply for automotive TFT-LCD applications. The device integrates one boost converter, one 1.8V/3.3V regulator controller, and two gate voltage regulators. The device comes in several versions to satisfy common automotive TFT-LCD Power-supply requirements.
The boost converter uses spread-spectrum modulation to reduce peak interference and to optimize EMI performance.
The sequencing input (SEQ) allows flexible sequencing of the positive-gate and negative-gate voltage regulators. The power-good indicator (PGOOD) indicates a failure on any of the converters or regulator outputs. Integrated thermal shutdown circuitry protects the device from overheating .
The MAX16928 is available in a 20-pin TSSOP package with exposed pad and operates over the -40NC to +105NC temperature range.
Key features of the MAX16928:
High-Power (Up to 6W) Boost Output Providing Up to 18V
1.8V or 3.3V Regulator Provides 500mA with External npn Transistor
One Positive-Gate Voltage Regulator Capable of Delivering 20mA at 28V
One Negative-Gate Voltage Regulator
High-Frequency 2.2MHz Operation
Flexible Stand-Alone Sequencing
True ShutdownTM Boost Converter
Internal Soft-Start
Overtemperature Shutdown
-40NC to +105NC Operation
AEC-Q100 Qualified
MAX16928 application:
Automotive Dashboards
Automotive Central Information Displays
Automotive Navigation Systems
Figure 1. Functional Block Diagram of the MAX16928 Boost Converter
Figure 2. Multi-level charge pump circuit with positive output voltage
Figure 3. Multi-level charge pump circuit with negative output voltage
Figure 4. MAX16928 application circuit diagram
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