USERS MANUAL ISL91107IRx-EVZ UG066 Rev.2.00 Evaluation Boards Aug 23, 2017 Description Key Board Features The ISL91107IR is a high-current buck-boost switching regulator Small, compact design for systems using new battery chemistries. It uses Intersils Jumper selectable EN (enabled/disabled) proprietary buck-boost algorithm to maintain voltage regulation, Jumper selectable MODE (auto-PFM/forced-PWM) while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage. The Connectors, test points, and jumpers for easy probing ISL91107IRN-EVZ and ISL91107IRA-EVZ platforms allow quick evaluation of the high performance features of the ISL91107IR Related Literature buck-boost regulator. For a full list of related documents, visit our website - ISL91107IR product page Specifications The boards are designed to operate at the following conditions: Ordering Information Input voltage rating from 1.8V to 5.5V PART NUMBER DESCRIPTION Resistor programmable output voltage on the ISL91107IRA-EVZ ISL91107IRN-EVZ Evaluation Board for ISL91107IRTNZ Fixed 3.3V output voltage on the ISL91107IRN-EVZ ISL91107IRA-EVZ Evaluation Board for ISL91107IRTAZ Up to 2A output current (P = 2.8V, V = 3.3V) VIN OUT 2.5MHz switching frequency Operating temperature range: -40C to +85C ISL91107IRAZ VIN PVIN LX1 GND VIN LX2 VOUT VOUT MODE FB GND EN SGND PGND FIGURE 1. ISL91107IRA-EVZ BLOCK DIAGRAM UG066 Rev.2.00 Page 1 of 6 Aug 23, 2017ISL91107IRx-EVZ load can be connected to the VOUT and GND headers on J2. Functional Description Measure the input and output currents. Calculate efficiency The ISL91107IRN-EVZ and ISL91107IRA-EVZ provide simple based on these measurements. platforms to demonstrate the features of the ISL91107IR TABLE 1. OUTPUT VOLTAGE PROGRAMMING FOR ISL91107IRA-EVZ buck-boost regulator. The ISL91107IRN-EVZ is for the fixed 3.3V output IC ISL91107IRTNZ. The ISL91107IRA-EVZ is for the DESIRED OUTPUT VOLTAGE R RESISTOR VALUE 2 (V) (k ) adjustable output IC ISL91107IRTAZ. The evaluation boards have been functionally optimized for best performance of the 2.0 124 ISL91107IR IC series. The input power and load connections are 2.5 88.7 provided through multi-pin connectors for high current operations. 3.0 68.1 The ISL91107IRA-EVZ evaluation board is shown in Figures 4 and 5. 3.3 60.4 The boards enable function is controlled by the on-board jumper 3.4 57.6 header J3. Similarly, the Mode function is controlled by the on-board jumper header J4. 3.6 53.6 The schematic of the ISL91107IRA-EVZ evaluation board is 4.0 46.4 shown in Figure 6 on page 4. The schematic for the ISL91107IRN-EVZ is shown in Figure 7 on page 5. The PCB layout images for all layers are shown in Figures 8 and 9 on page 6. The bill of materials of the ISL91107IRA-EVZ is shown in Table 2 on EN (2V/DIV) page 4. The bill of materials of the ISL91107IRN-EVZ is shown in Table 3 on page 5. Operating Range The V range of the boards is 1.8V to 5.5V. The adjustable V IN OUT V (1V/DIV) OUT range for the ISL91107IRA-EVZ is 1V to 5.2V. The I range of the OUT boards is 0 to 2A. The operating ambient temperature range is INDUCTOR CURRENT -40C to +85C. (200mA/DIV) Quick Start Guide For the ISL91107IRA-EVZ board, the default output voltage is set 1ms/DIV at 3.3V. If other output voltages are desired, resistor R can be FIGURE 2. ISL91107IR START-UP WITH V = 2V AND V = 3.3V 2 IN OUT set to a desired voltage as shown in Table 1 (use a resistor with 1% accuracy). Refer to the Quick Setup Guide to configure and power up the board for proper operation. During the power-on process, the expected waveforms are shown in Figures 2 and 3. EN (2V/DIV) Quick Setup Guide 1. Install a jumper on J3, shorting EN to VIN. 2. Install a jumper on J4, shorting MODE to VIN. 3. Connect the power supply to J1, with a voltage setting V (1V/DIV) between 1.8V and 5.5V. OUT 4. Connect the electronic load to J2. 5. Place scope probes on the VOUT test point and other test INDUCTOR CURRENT points of interest. (200mA/DIV) 6. Turn on the power supply. 1ms/DIV 7. Monitor the output voltage start-up sequence on the scope. The FIGURE 3. ISL91107IR START-UP WITH V = 4V AND V = 3.3V waveforms will look similar to that shown in Figures 2 and 3. IN OUT 8. Turn on the electronic load. 9. Measure the output voltage with the voltmeter. The voltage should regulate within datasheet specific limits. 10. To determine efficiency, measure the input and output voltages at J1 and J2 headers. The bench power supply can be connected to the PVIN and GND headers on J1. The electronic UG066 Rev.2.00 Page 2 of 6 Aug 23, 2017