MAX16927

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

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Overview

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

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.

Applications

Automotive Central Information Displays
Automotive Dashboards
Automotive Navigation Systems

Documentation

Data Sheet 1

MAX16927: Automotive TFT-LCD Power Supply with Boost, Buck, and Cuk Converters, VCOM Buffers, Gate Drivers, and SPI Interface Data Sheet (Rev.6) 05/03/2018

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX16927

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Features and Benefits

+6V to +16V Single-Supply Operation
+3V to +5.5V Single-Supply Operation
Output Voltages
- +3.3V Output at 2A (VCC3 Buck Converter)
- +7V Output at 200mA (VSH Boost Converter)
- -7V Output at 100mA (VSL Cuk Converter)
- +12V Output at 20mA (VGH Positive Gate-Voltage Linear Regulator)
- -12V Output at 20mA (VGL Negative Gate-Voltage Linear-Regulator Controller)
DAC-Controlled VCOM Buffers
- -1V to +1V DAC-Adjustable VCOML (±10mA), or
- +2.5V to +4.5V DAC-Adjustable VCOMH (±100mA)
2.1MHz PWM Switching Frequency (Buck Converter)
1.2MHz PWM Switching Frequency (Boost and Cuk Converters)
All Output Voltages are Resistor Adjustable (Except for the Buck Converter)
On-Board USB Interface Circuit Generates SPI-Compatible Signals
USB-PC Connection and Power (Cable Included)
PCB Header for User-Supplied SPI-Compatible Signals
Evaluates the MAX16927GTM/V+ in a 48-Pin TQFN (7mm x 7mm x 0.8mm) Package with an Exposed Pad
Windows 2000-, Windows XP-, and Windows Vista (32-Bit)-Compatible Software
Fully Assembled and Tested

Product Details

The MAX16927 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that provides the voltages and features required for display systems in automotive applications. The EV kit contains a buck converter, boost converter, Cuk converter, positive gate-voltage linear regulator, negative gate-voltage linear-regulator controller, DAC-adjustable positive VCOM buffer, and DAC-adjustable negative VCOM buffer.

The EV kit operates from +6V to +16V or +3V to +5.5V DC supply voltage ranges. The EV kit’s default input range is configured to +6V to +16V. The buck converter (VCC3) is configured for a +3.3V output providing at least 2A. The boost converter (VSH) is configured for a +7V output providing at least 200mA. The Cuk converter (VSL) is configured for a -7V output providing at least 100mA. The positive gate-voltage linear regulator (VGH) is configured for a +12V output providing at least 20mA. The negative gate-voltage linear-regulator controller (VGL) is configured for a -12V output providing at least 20mA. The negative VCOM buffer (VCOML) is DAC adjustable between -1V and +1V and can source or sink 10mA. The positive VCOM buffer (VCOMH) is DAC adjustable between +2.5V and +4.5V and can source or sink 100mA.

The EV kit provides an on-board USB interface circuit to communicate with the SPI interface circuits in the MAX16927 IC.

The EV kit also includes Windows® 2000-, Windows XP®-, and Windows Vista®-compatible software that provides the user interface for exercising the features of the IC. The program is menu driven and offers a graphical user interface (GUI).