ISL91127IRA-EVZ

USER’S MANUAL ISL91127IRN-EVZ, ISL91127IRA-EVZ UG080 Rev 2.00 October 28, 2016 Evaluation Board User Guide Description Key Board Features The ISL91127IR is a high-current buck-boost switching regulator for systems using new battery chemistries. It uses Intersil’s proprietary buck-boost algorithm to maintain voltage regulation, while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage. The ISL91127IRN-EVZ and ISL91127IRA-EVZ platforms allow quick evaluation of the high performance features of the ISL91127IR buck-boost regulator series. • Small, compact design • Jumper selectable EN (enabled/disabled) • Jumper selectable MODE (auto-PFM/forced-PWM) • Connectors, test points and jumpers for easy probing References • ISL91127IR datasheet Specifications Ordering Information The boards are designed to operate at the following operating conditions: PART NUMBER DESCRIPTION • Input voltage rating from 1.8V to 5.5V ISL91127IRN-EVZ Evaluation Board for ISL91127IRNZ • Resistor programmable output voltage on the ISL91127IRA-EVZ ISL91127IRA-EVZ Evaluation Board for ISL91127IRAZ • Fixed 3.3V output voltage on the ISL91127IRN-EVZ • Up to 2A output current (PVIN = 2.5V, VOUT = 3.3V) • 2.5MHz switching frequency • Operating temperature range: -40°C to +85°C ISL91127IRAZ VIN GND PVIN LX1 VIN LX2 VOUT VOUT MODE FB GND EN SGND PGND FIGURE 1. ISL91127IRA-EVZ BLOCK DIAGRAM UG080 Rev 2.00 October 28, 2016 Page 1 of 7 ISL91127IRN-EVZ, ISL91127IRA-EVZ Functional Description The ISL91127IRN-EVZ and ISL91127IRA-EVZ provide simple platforms to demonstrate the features of the ISL91127IR buck-boost regulator. The ISL91127IRN-EVZ is for the fixed 3.3V output IC ISL91127IRNZ. The ISL91127IRA-EVZ is for the adjustable output IC ISL91127IRAZ. The evaluation boards have been functionally optimized for best performance of the ISL91127IR IC series. The input power and load connections are provided through multi-pin connectors for high current operation. 10. To determine efficiency, measure input and output voltages at J1 and J2 headers. The bench power supply can be connected to the PVIN and GND headers on J2. The electronic load can be connected to the VOUT and GND headers on J1. Measure the input and output currents. Calculate efficiency based on these measurements. TABLE 1. OUTPUT VOLTAGE PROGRAMMING FOR ISL91127IRA-EVZ DESIRED OUTPUT VOLTAGE (V) R2 RESISTOR VALUE (kΩ) The ISL91127IRA-EVZ and ISL91127IRN-EVZ evaluation boards are shown in Figures 4 and 5. The board’s enable function is controlled by the on-board jumper header J3. Similarly, the Mode function is controlled by the on-board jumper header J4. 2.0 124 2.5 88.7 3.0 68.1 The schematic of the ISL91127IRA-EVZ evaluation board is shown in Figure 6 and the schematic of the ISL91127IRN-EVZ is shown in Figure 7. The PCB layout images for all layers are shown in Figures 8 and 9. The bill of materials of ISL91127IRA-EVZ is shown in Table 2 and the bill of materials of ISL91127IRN-EVZ is shown in Table 3. 3.3 60.4 3.4 57.6 4.0 46.4 4.5 40.2 5.0 35.7 5.1 34.8 Operating Range The VIN range of the boards is 1.8V to 5.5V. The VOUT range for the ISL91127IRA-EVZ is 2V to 5V. The IOUT range of the boards is 0A to 2A. The operating ambient temperature range is -40°C to +85°C. Quick Start Guide For the ISL91127IRA-EVZ board, the default output voltage is set at 3.3V. If other output voltages are desired, resistor R2 can be set to a desired voltage as shown in Table 1 (use a resistor with 1% accuracy). Refer to the following 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. Quick Setup Guide LX1 2V/DIV LX2 2V/DIV VOUT 2V/DIV EN 2V/DIV IOUT = 200mA 400µs/DIV FIGURE 2. ISL91127IR START-UP WITH VIN = 2V AND VOUT = 3.3V 1. Install jumper on J3, shorting EN to VIN. 2. Install jumper on J4, shorting MODE to VIN. 3. Connect power supply to J2, with voltage setting between 1.8V and 5.5V. LX1 2V/DIV 4. Connect electronic load to J1. 5. Place scope probes on the VOUT test point and other test points of interest. LX2 2V/DIV 6. Turn on the power supply. VOUT 2V/DIV 7. Monitor the output voltage start-up sequence on the scope. The waveforms will look similar to that shown in Figures 2 and 3. 8. Turn on the electronic load. 9. Measure the output voltage with the voltmeter. The voltage should regulate within datasheet specification limits. EN 2V/DIV IOUT = 200mA 400µs/DIV FIGURE 3. ISL91127IR START-UP WITH VIN = 4V AND VOUT = 3.3V UG080 Rev 2.00 October 28, 2016 Page 2 of 7 ISL91127IRN-EVZ, ISL91127IRA-EVZ Evaluation Board Images FIGURE 4. ISL91127IRA-EVZ TOP VIEW FIGURE 5. ISL91127IRN-EVZ TOP VIEW UG080 Rev 2.00 October 28, 2016 Page 3 of 7 ISL91127IRN-EVZ, ISL91127IRA-EVZ TABLE 2. ISL91127IRA-EVZ EVALUATION BOARD BILL OF MATERIALS ITEM# QTY DESIGNATORS PART TYPE FOOTPRINT DESCRIPTION VENDORS 1 1 U1 ISL91127IRAZ 4mmx4mm QFN Intersil ISL91127IR Buck-Boost Regulator with Adjustable Output Voltage INTERSIL 2 1 L1 1µH 3.2mmx2.5mmx1.2mm Power Inductor Toko DFE322512C series, 4.6A (typ), 34mΩ (typ) TOKO 3 1 C1 150µF 7343 Capacitor, Tantalum ANY 4 2 C2, C3 10µF/16V/X5R 0603 Capacitor, Generic ANY 5 2 C4, C5 22µF/10V/X5R 0603 Capacitor, Generic ANY 6 1 C6 22pF 0402 Capacitor, 56pF 50V 5% NP0 0402 ANY 7 1 C7 DNP 0402 8 1 R1 187kΩ, 1% 0402 Resistor, Generic ANY 9 1 R2 60.4kΩ, 1% 0402 Resistor, Generic ANY 10 2 R3, R4 1MΩ, 5% 0603 Resistor, Generic ANY 11 2 J1, J2 HDR-6 HDR-6 Vert. Pin Header, 6-Pin, 0.1” Spacing, Generic ANY 12 2 J3, J4 HDR-3 HDR-3 Vert. Pin Header, 3-Pin, 0.1” Spacing, Generic ANY 13 6 TP1 to TP6 Power Post Connectors ANY ANY TABLE 3. ISL91127IRN-EVZ EVALUATION BOARD BILL OF MATERIALS ITEM# QTY DESIGNATORS PART TYPE FOOTPRINT 1 1 U1 ISL91127IRNZ 4mmx4mm QFN 2 1 L1 1µH 3 1 C1 150µF 7343 Capacitor, Tantalum ANY 4 2 C2, C3 10µF/16V/X5R 0603 Capacitor, Generic ANY 5 2 C4, C5 22µF/10V/X5R 0603 Capacitor, Generic ANY 6 1 C6 DNP 0402 ANY 7 1 C7 DNP 0402 ANY 8 1 R1 0Ω 0402 9 1 R2 DNP 0402 10 2 R3, R4 1MΩ, 5% 0603 Resistor, Generic ANY 11 2 J1, J2 HDR-6 HDR-6 Vert. Pin Header, 6-Pin, 0.1” Spacing, Generic ANY 12 2 J3, J4 HDR-3 HDR-3 Vert. Pin Header, 3-Pin, 0.1” Spacing, Generic ANY 13 6 TP1 to TP6 Power Post Connectors ANY UG080 Rev 2.00 October 28, 2016 DESCRIPTION Intersil ISL91127IR Buck-Boost Regulator with Fixed Output Voltage 3.2mmx2.5mmx1.2mm Power Inductor Toko DFE322512C series, 4.6A (typ), 34mΩ (typ) Resistor, Generic VENDORS INTERSIL TOKO ANY ANY Page 4 of 7 ISL91127IRN-EVZ, ISL91127IRA-EVZ ISL91127IRA-EVZ, ISL91127IRN-EVZ Schematics 73 /; 73 /; / /; /; 8+ 8 ,6/,5$   73 9,1 /;D /;E /;D /;E   73 9287 - -     39,1 & X) & & X) X)  3*1'  02'(  9287D 9287E 9287F 9287G     5 . 02'( & & & 8) 8) '13 & S) 9,1 (1 )% 1&       9287 3*1'   5 .     (1 39,1D 39,1E 39,1F 39,1G 3*1' 6*1'D 6*1'E JQG       73 *1' - 73 *1' -       39,1 02'( 5 . 39,1 (1 5 . FIGURE 6. ISL91127IRA-EVZ EVALUATION BOARD SCHEMATIC 73 /; 73 /; / /; /; 8+ 8 ,6/,51   73 9,1 /;D /;E /;D /;E   73 9287 - -     39,1 & X) & & X) X)  3*1'  02'(  9287D 9287E 9287F 9287G     9287 5  & & 8) 8) '13 & '13 9,1 (1 02'( & )% 1& 3*1'         5 '13     (1 39,1D 39,1E 39,1F 39,1G 3*1' 6*1'D 6*1'E JQG       73 *1' - 73 *1' -    39,1 02'( 5 .    39,1 (1 5 . FIGURE 7. ISL91127IRN-EVZ EVALUATION BOARD SCHEMATIC UG080 Rev 2.00 October 28, 2016 Page 5 of 7 ISL91127IRN-EVZ, ISL91127IRA-EVZ PCB Layout FIGURE 8. TOP LAYER FIGURE 9. BOTTOM LAYER UG080 Rev 2.00 October 28, 2016 Page 6 of 7 Notice 1. Descriptions of circuits, software and other related information in this document are provided only to illustrate the operation of semiconductor products and application examples. You are fully responsible for the incorporation or any other use of the circuits, software, and information in the design of your product or system. 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