Click here for production status of specific part numbers. MAX20069 Evaluation Kit Evaluates: MAX20069/MAX20069B General Description Benefits and Features The MAX20069 evaluation kit (EV kit) demonstrates the Demonstrates Robustness of MAX20069 MAX20069 IC, which is a highly integrated power sup- 2.8V to 5.5V Input Range for TFT Power Section ply plus LED backlight driver for automotive TFT-LCD 4.5V to 42V Input Range for LED Driver Section 2 applications. The EV kit is a fully assembled and tested 2.2MHz or 440kHz I C programmable Boost and surface-mount PCB that provides a complete power- Inverted Buck-Boost Switching Frequency with management solution for small-size automotive displays. Spread-Spectrum Option on TFT Power Section 2 The EV kit demonstrates one buck-boost converter, one 2.2MHz or 440kHz I C programmable Boost boost converter, two gate-voltage controllers, and a boost Frequency with Spread-Spectrum Option on LED converter that powers a quad-string LED driver. Driver Section with four 150mA LED drivers TFT Section Default Output Voltages (Stand-alone The EV kit can be configured to operate in stand-alone Mode) 2 mode or in I C mode. +6V Output at 150mA (Step-Up Switching Regulator) The TFT bias portion of the EV kit operates from a 2.8V to -6V Output at 100mA (Inverting Buck-Boost Switching 5.5V DC supply voltage. The step-up switching regulator Regulator) (POS) is configured for a 4V to 18V output that provides +16V Output at 3mA (Positive-Charge Pump) up to 150mA. The inverting buck-boost converter (NEG) -7V Output at 3mA (Negative-Charge Pump) generates a negative output that tracks the positive output HB LED String Output Currents Configurable for (down to a minimum of -7V) and provides up to 100mA. 20mA, 50mA, 100mA, 120mA or 150mA The gate-driver power supplies consist of regulated Demonstrates Cycle-by-Cycle Current-Limit and charge pumps that generate +28V (GVDD) and -21.5V Thermal-Shutdown Features on Boost LED Driver (GVEE) and can deliver up to 3mA each. Demonstrates Adaptive Voltage Optimization on LED The LED driver section demonstrates a step-up DC-DC Driver Section 2 pre-regulator followed by four channels of linear current I C Programmability sinks. The step-up pre-regulator switches at 2.2MHz or Dedicated GUI at 440kHz and operates as a current-mode-controlled Proven PCB Layout and Thermal Design regulator capable of providing up to 600mA for the linear Fully Assembled and Tested circuits. Each channel can operate up to 48V and pro- vides up to 150mA. The LED driver portion of the EV kit operates from a DC supply voltage of 4.5V up to the HB LED string-forward voltage. The EV kit can withstand a 52V load-dump con- dition. The EV kit also demonstrates the ICs features, Ordering Information appears at end of data sheet. such as adaptive voltage optimization, Overvoltage and Undervoltage protection, cycle-by-cycle current limit, thermal shutdown, and digital PWM dimming operation using a digital PWM input signal to control the brightness of the HB LEDs. 2 The EV kit provides an I C interface that can operate in conjunction with the MINIQUSB+ adapter board or a third- 2 party I C master. The EV kit also includes Windows - compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC. 19-100228 Rev 1 7/20MAX20069 Evaluation Kit Evaluates: MAX20069/MAX20069B 6) Verify that jumpers JMP1-JMP4 have shunts installed MAX20069 EV KIT FILES across pins 1-2 (bleed resistors connected, all current FILE DECRIPTION sinks enabled). MAX20069GUISetupV01.exe Windows GUI Installer 7) Verify that jumper I2C is open and that jumper J2 is closed (SEQ pin connected to GND through R1 = 10k resistor). Quick Start 8) Verify that a shunt is installed across pins 2-3 on Required Equipment jumper J12 (BATT pin connected to BATT PCB pad). MAX20069 EV kit 9) Verify that jumper 100mA is closed. 2.8 to 5.5V, 2A DC power supply 10) Connect the positive terminal of the 2.8V to 5.5V, 2A DC power supply to the TFT POWER INPUT PCB 5V to 36V, 4A DC power supply pad. Connect the negative terminal of the power sup- Two digital voltmeters (DVMs) ply to a PGND PCB pad. Four series-connected HB LED strings (6 LEDs 11) Connect the positive terminal of the 5V to 36V, 4A each) rated to no less than 150mA DC power supply to the BATT PCB pad. Connect Current probe to measure the HB LED current the negative terminal of the power supply to a PGND PCB pad. MINIQUSB+ interface board with USB cable 12) Connect a DVM across the OUT1 and AGND PCB Windows-compatible PC with a spare USB port pads. Note: In the following sections, text that has been bolded 13) Connect a DVM across one of the TFT output PCB refers to the MAX20069 GUI software. Text that is bold pads (POS, NEG, VGVDD, VGVEE) and the AGND and underlined refers to the Windows operating system. PCB pad. Procedure 14) Connect the four LED strings from VBOOST to the The EV kit is fully assembled and tested. Follow the steps OUT1, OUT2, OUT3 and OUT4 PCB pads. below to verify board operation. 15) Clip the current probe across the channel 1 HB LED+ Caution: Do not turn on the power supply until all wire to measure the LED current. connections are completed. 16) Turn on the 2.8V to 5.5V, 2A DC power supply and set Stand-Alone Mode it to 3.3V. The green LED (DS1) should be on at this point. 1) Verify that jumper J1 is closed (DS1 green LED con- nected). 17) Turn on the 5V to 36V, 4A DC power supply and set it to 12V. The LED strings should be on at this point. 2) Verify that jumper J9 is closed (FAULT signaling enabled). 18) Verify the presence of the following default TFT volt- ages: POS = - NEG = 6V VGVDD = 16V VGVEE = 3) Verify that jumper J23 is open (device enabled). -7V. 4) Verify that jumper J19 is closed (buck-boost converter 19) Measure the voltage from each of the OUT PCB input connected to TFT POWER INPUT PCB pad). pads to PGND and verify the lowest voltage is 5) Verify that jumpers J10, J11, J21 are open (FBP, approximately 1V. FBPG, FBNG feedback Inputs enabled). 20) Measure the LED current using the current probe and verify all channels. Maxim Integrated 2 www.maximintegrated.com