Evaluate: MAX16990/MAX16992 MAX16990/MAX16992 Evaluation Kits General Description Quick Start The MAX16990/MAX16992 evaluation kits (EV kits) Required Equipment are fully assembled and tested PCBs that contain a MAX16990 or MAX16992 EV kit 16W DC-DC converter for front-end preboost automotive 3V to 36V, 10A DC power supply applications. The devices integrate a low-side FET driver and current-mode control-loop circuitry for output-voltage Digital voltmeter (DVM) regulation, making them ideal for automotive boost or 2A load SEPIC converters. The MAX16990 integrated driver switches at 400kHz, while the MAX16992 integrated Output Testing driver switches at 2.2MHz using the default configuration. Each EV kit is fully assembled and tested. Follow the The MAX16990 can be synchronized with an external steps below to verify board operation. Caution: Do not clock source within the 100kHz to 1MHz range, and the turn on the power supply until all connections are MAX16992 within the 1MHz to 2.5MHz range. completed. The EV kits operate from a DC supply voltage of 4.5V 1) Verify that a shunt is installed on pins 1-2 on jumper (3V in bootstrapped mode) up to 36V. The EV kits can JU1 (device enabled). withstand a 42V load-dump condition for up to 400ms. 2) Verify that a shunt is installed on jumper JU3 (FB Each EV kit demonstrates the device features, such internal reference). as dynamic adjustable output voltage, external clock 3) Verify that a shunt is installed on pins 1-2 (normal synchronization, two-phase operation configurability, mode) or 2-3 (bootstrapped mode) on jumper JU2. cycle-by-cycle current limit, hiccup mode, and thermal shutdown. The boost converter regulates 8V and can 4) Connect the power supply to the VBAT PCB pad and supply a current up to 2A. Each EV kit includes an exter- the power supplys ground to the PGND PCB pad. nal p-MOSFET (P1) that can be used to disconnect the 5) Connect DVM across the VOUT and AGND test point. boost output from the load in a fault condition. The EV 6) Turn on the power supply and set it to 4.5V. kits also demonstrate a reference MAX16990 design for automotive applications. 7) Measure the voltage from the VOUT PCB pad to AGND and verify that it is 8V. Features 8) Apply the 2A load on the VOUT or SWITCHED VOUT 4.5V (3V in Bootstrapped Mode) Up to 36V Input PCB pad. Voltage Range 8V Up to 2A Output Demonstrates External Clock Synchronization Ordering Information appears at end of data sheet. Demonstrates SUP UVLO Demonstrates Cycle-by-Cycle Current Limit and Hiccup Mode Thermal-Shutdown Protection PGOOD Flag Demonstrates Dynamic Adjustable Output Switched Output Option Demonstrates Two Phases of Operation Proven PCB Layout and Thermal Design Fully Assembled and Tested 19-6788 Rev 0 9/13Evaluate: MAX16990/MAX16992 MAX16990/MAX16992 Evaluation Kits fault condition. The EV kits also demonstrate a reference Detailed Description of Hardware MAX16990 design for automotive applications. The MAX16990/MAX16992 EV kits are fully assembled and tested PCBs that contain a 16W DC-DC converter for Enable front-end preboost automotive applications. The devices The EV kits feature an enable input that can be used to integrate a low-side FET driver and current-mode control- enable and disable the device and place it in shutdown loop circuitry for output-voltage regulation, making them mode. To enable the EV kits whenever power is applied ideal for automotive boost or SEPIC converters. The to VIN and PGND, place the jumper on pins 1-2 on jumper MAX16990 integrated driver switches at 400kHz, while JU1. the MAX16992 integrated driver switches at 2.2MHz To enable the EV kit from an external enable signal, leave using the default configuration. The MAX16990 can be jumper JU1 disconnected. In this configuration, apply a synchronized with an external clock source within the logic signal on the ENABLE input pad on the EV kit. The 100kHz to 1MHz range, and the MAX16992 within the enable (EN) input should not be left unconnected. 1MHz to 2.5MHz range. Refer to the EN pin description in the MAX16990/ The EV kits operate from a DC supply voltage of 4.5V (3V MAX16992 IC data sheet for additional information. See in bootstrapped mode) up to 36V. The EV kits can with- Table 1 for jumper JU1 settings. stand a 42V load-dump condition for up to 400ms. Each EV kit demonstrates the device features such as dynamic Bootstrap Mode adjustable output voltage, external clock synchronization, For applications where the input voltage goes below 4.5V, two-phase operation configurability, cycle-by-cycle cur- use the device in bootstrapped mode, placing the jumper rent limit, hiccup mode, and thermal shutdown. The boost on pins 2-3 on JU2. In bootstrapped configuration, the converter regulates 8V and can supply a current up to 2A. device is supplied by the output of the boost regulator itself The EV kits include an external p-MOSFET (P1) that can and does not trigger the UVLO, even if the input voltage be used to disconnect the boost output from the load in a goes down to 3V. See Table 2 for jumper JU2 settings. Table 1. Enable (JU1) SHUNT POSITION EN PIN EV KIT OPERATION 1-2* Connected to SUP Enabled 2-3 Connected to AGND Disabled Unconnected Connected to an external controller External controller enabled *Default position. Table 2. Bootstrap Mode (JU2) SHUNT POSITION SUP PIN EV KIT OPERATION 1-2* Connected to SUP Normal 2-3 Connected to VOUT Bootstrapped *Default position. Maxim Integrated 2 www.maximintegrated.com