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Maxim Integrated MAX16929

Automotive TFT-LCD Power Supply with Boost Converter and Gate Voltage Regulators

Overview

TopologyBuck Converter
Input voltage3.3-5.5 V
Switching frequency1980-2420 kHz
Output 15 V / 1.2 A
IC revision2

Description

The MAX16929 is a highly integrated power supply for automotive TFT-LCD applications. The device integrates one buck converter, 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 power-supply requirements (see the Ordering Information/Selector Guide table).Designed to operate from a single 4V to 28V supply or 5.5V to 28V supply, the device is ideal for automotive TFT-LCD applications.Both the buck and boost converters use 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 MAX16929 is available in a 28-pin TSSOP package with exposed pad, and operates over the -40NC to +105NC temperature range.

Features

  • Operating Voltage Range of 4V to 28V (Buck) or 3V to 5.5V (Boost)
  • Independent 28V Input Buck Converter Powers TFT Bias Supply Circuitry and External Circuitry
  • 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 Operation ◦ 2.1MHz (Buck Converter)
  • 2.2MHz (Boost Converter)
  • Flexible Stand-Alone Sequencing
  • True Shutdown™ Boost Converter
  • 6μA Low-Current Shutdown Mode (Buck)
  • Internal Soft-Start
  • Overtemperature Shutdown
  • -40°C to +105°C Operation

Remarks:

  • Refer page num 16 for more inductor values.

Typical applications

  • Automotive Navigation Systems
  • Automotive Central Information Displays
  • Automotive Dashboards