Automotive TFT-LCD Power Supply with Boost, Buck, and Cuk Converters, VCOM Buffers, Gate Drivers, and SPI Interface

Complete Automotive TFT-LCD Bias Power Supply


The MAX16927 is a highly integrated power supply for automotive TFT-LCD applications. The device integrates one buck converter, one boost converter, one Cuk converter, two gate-voltage controllers, and two VCOM buffers, one of which supports negative output voltages. The device is designed to operate from a supply voltage between 4.5V and 16V, making it ideal for automotive TFT-LCD applications. Alternatively, the device can operate from an available 3V to 5.5V supply.

The device uses an integrated SPI interface for control and diagnostics. The SPI interface adjusts the VCOM buffer output through an internal 7-bit DAC up to +1V. The startup and shutdown sequences can be controlled through SPI or using one of the three preset stand-alone modes.

The device is optimized for low EMI. Peak interference is reduced by using the spread-spectrum feature. Spread-spectrum is always enabled for the buck converter but enabled through an external input (SSEN) for the boost and Cuk converters. Additional EMI enhancement is achieved by running the boost and Cuk converters 180 degrees out-of-phase.

The device includes a control output for an nMOS switch to enable flexible sequencing of the negative VSL output. A drive output is also included for a series pMOS switch for the boost converter allowing True Shutdown.

The device is available in a 48-lead TQFN package with an exposed pad, and operates over the -40°C to +105°C temperature range.
MAX16927: Typical Operating Circuit MAX16927: Typical Operating Circuit Enlarge+

Key Features

  • Operating Voltage Range of 4.5V to 16V (IN3) or 3V to 5.5V (INA)
  • 16V Input, 2A Buck Converter Provides 3.3V Output to TFT Bias-Supply Circuitry and/or Other External Circuitry
  • Flexible Configuration Allows Single High-Power Positive Output (18V/200mA) or Positive Output (18V, 100mA) and Negative Output (-12V/100mA)
  • One Positive Gate-Voltage Regulator
  • One Negative Gate-Voltage Controller
  • DAC-Controlled VCOM Buffers with Offset of 0V to 1V
  • High-Frequency Operation
    • 2.1MHz (Buck Converter)
    • 1.2MHz (Boost and Cuk Converters)
  • Converters Run Out-of-Phase for Lower EMI
  • Externally Controlled Spread-Spectrum Switching for Boost and Cuk
  • Very Flexible Sequencing in Both Stand-Alone and SPI-Controlled Modes
  • True Shutdown Boost Converter
  • Low-Current Shutdown Mode (< 10µA)
  • SPI Control Interface
  • Internal Soft-Start
  • Overtemperature Shutdown
  • -40°C to +105°C Operation
  • AEC-Q100 Qualified


  • Automotive Central Information Displays
  • Automotive Dashboards
  • Automotive Navigation Systems
Part Number Primary Topology Monitor/Control Features DC-DC/Power Features LCD/LED/Flash/CCD Features Interface Type VIN
Oper. Freq.
Inverting Outputs Package/Pins
min max min max
External Synch.
Low Batt./POK Output
Serial Interface
Avg. Current Mode Control
Current Limit
Internal Switch
Soft Start
TFT Bias
VCOM Buffer
SPI 4.5 16 -21 21 2 2 2000 1
See All Multifunction PMICs (70)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX16927EVKIT: Evaluation Kit for the MAX16927

Quality and Environmental Data

Request Reliability Report for: MAX16927 
Lead-Free Package Tin (Sn) Whisker Reports

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