EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX16927 Automotive TFT-LCD Power Supply with Boost, Buck, and Cuk Converters, VCOM Buffers, Gate Drivers, and SPI Interface General Description Benefits and Features The MAX16927 is a highly integrated power Operating Voltage Range of 4.5V to 16V (IN3) or 3V supply for automotive TFT-LCD applications. The device to 5.5V (INA) integrates one buck converter, one boost converter, one Cuk 16V Input, 2A Buck Converter Provides 3.3V Output converter, two gate-voltage controllers, and two VCOM to TFT Bias-Supply Circuitry and/or Other External buffers, one of which supports negative output voltages. Circuitry The device is designed to operate from a supply voltage Flexible Configuration Allows Single High-Power between 4.5V and 16V, making it ideal for automotive TFT- Positive Output (18V/200mA) or Positive Output LCD applications. Alternatively, the device can operate (18V, 100mA) and Negative Output (-12V/100mA) from an available 3V to 5.5V supply. One Positive Gate-Voltage Regulator The device uses an integrated SPI interface for control One Negative Gate-Voltage Controller and diagnostics. The SPI interface adjusts the VCOM buffer output through an internal 7-bit DAC up to +1V. DAC-Controlled VCOM Buffers with Offset of The startup and shutdown sequences can be controlled 0V to +1V through SPI or using one of the three preset stand-alone High-Frequency Operation modes. 2.1MHz (Buck Converter) The device is optimized for low EMI. Peak interference is 1.2MHz (Boost and Cuk Converters) reduced by using the spread-spectrum feature. Spread Converters Run Out-of-Phase for Lower EMI spectrum is always enabled for the buck converter, but Externally Controlled Spread-Spectrum Switching for enabled through an external input (SSEN) for the boost Boost and Cuk and Cuk converters. Additional EMI enhancement is achieved by running the boost and Cuk converters 180 Very Flexible Sequencing in Both Stand-Alone and out-of-phase. SPI-Controlled Modes The device includes a control output for an nMOS switch True Shutdown Boost Converter to enable flexible sequencing of the negative VSL output. Low-Current Shutdown Mode (< 10A) A drive output is also included for a series pMOS switch SPI Control Interface for the boost converter allowing True Shutdown. Internal Soft-Start The device is available in a 48-lead TQFN package with an exposed pad, and operates over the -40C to +105C Overtemperature Shutdown temperature range. -40C to +105C Operation AEC-Q100 Qualified Applications Automotive Dashboards Ordering Information Automotive Central Information Displays Automotive Navigation Systems PART TEMP RANGE PIN-PACKAGE MAX16927GTM/V+ -40C to +105C 48 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. *EP = Exposed pad. Block Diagram and Typical Operating Circuits appear at True Shutdown is a trademark of Maxim Integrated Products, end of data sheet. Inc. 19-5571 Rev 6 5/18MAX16927 Automotive TFT-LCD Power Supply with Boost, Buck, and Cuk Converters, VCOM Buffers, Gate Drivers, and SPI Interface Absolute Maximum Ratings IN3, LXN, LXP, LX3, VCOMP, EN3 to GND...........-0.3V to +20V VCOMN to GND....................................................-7.5V to +0.3V BST to GND............................................................-0.3V to +26V VCOMP to GND......................................................-0.3V to +20V BST to LX3................................................................-0.3V to +6V VSLS to GND..........................................................-20V to +0.3V VCP, VGH to GND..................................................-0.3V to +24V PGOOD, SYNC, AVL to GND...................................-0.3V to +6V DRVN to GND.........................................................-25V to +0.3V GND to PGND3, PGNDP, PGNDN........................-0.3V to +0.3V FLT, INA to GND......................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A CS, CLK, DIN, EN1, EN2, ENP, REF, FBP, TQFN (derate 38.5mW/C above +70C)...................3076mW FBGH, GATE to GND...........................-0.3V to (V + 0.3V) Operating Temperature Range...........................-40C to +105C INA FBGL, FBN, DOUT, SSEN, COMPP, Junction Temperature Range............................ -40C to +150C COMPN to GND.................-0.3V to (V + 0.3V) Storage Temperature Range..............................-65C to +150C INA FB3 to GND............................................................-0.3V to +12V Lead Temperature (soldering, 10s)...................................+300C VCOMH, VCINH to GND........................................-0.3V to +20V Soldering Temperature (reflow)........................................+260C VCOML, VCINL to GND (Note 1)..........................-1.5V to +1.5V Note 1: Pin protection is temperature dependent. Temperature behavior T = -40C, 1.8V T = +150C, 0.9V. J J Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics (Note 2) TQFN Junction-to-Ambient Thermal Resistance ( )...........26C/W Junction-to-Case Thermal Resistance ( )..................1C/W JA JC Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (V = 12V, V = 3.3V, T = T = -40C to +105C, unless otherwise noted. Typical values are at T = T = +25C.) (Note 3) IN3 INA A J A J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS BUCK CONVERTER Supply Voltage Range V V = 3.3V 4.5 16 V IN3 OUT V = 0V 10 A EN3 Supply Current I IN3 V = V , no load 5.3 mA EN3 IN3 AVL rising 2.7 3 Undervoltage Lockout (UVLO) V Hysteresis 0.1 AVL Voltage 6V V 16V 5 V IN3 AVL Voltage (Skip Mode) 6V V 16V, V = 0V, I = 0A 3.3 V IN3 SYNC LOAD Spread-Spectrum Range 6 % Switching Frequency f Internally generated 1.925 2.1 2.275 MHz SW SYNC Input Frequency Range 1.8 2.6 MHz Continuous mode 3.2% 3.3 3.36% 4.75V V 16V, IN3 Output Voltage V V OUT3 I < 2A Skip mode (Note 4) 3.17% 3.3 3.43% LOAD High-Side DMOS On-Resistance R I = 1000mA, V = V = 5V 100 250 m DS ON(3) LX IN3 AVL DMOS Current-Limit Threshold 2.72 3.4 4.08 A Soft-Start Ramp Time t 0.25 0.419 0.65 ms SS Guaranteed Output Current I 4.75V V 16V 2 A OUT3(MIN) IN3 Duty-Cycle Range 15 99 % Maxim Integrated 2 www.maximintegrated.com