ISL91108IIA-EVZ/ISL91108IIN-EVZ Evaluation Board User Guide
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1 Author: Sameer Dash ISL91108IIA-EVZ/ISL91108IIN-EVZ Evaluation Board User Guide Evaluation Board Features ISL91108 high efficiency buck-boost regulator Input voltage rating from 1.8V to 5.5V Resistor programmable output voltage on the ISL91108IIA-EVZ evaluation board Fixed 3.3V output voltage on the ISL91108IIN-EVZ evaluation board Up to 1.5A output current (PVIN = 3.0V, V OUT = 3.3V) 2.5MHz switching frequency Jumper selectable EN (enabled/disabled) Jumper selectable MODE (auto-pfm/forced-pwm) Connectors, testpoints, and jumpers for easy evaluation Required Equipment Power supply capable of delivering up to 5.5V and 4A Electronic load Multimeter to measure voltages and currents Oscilloscope Testpoints, Connectors, and Jumpers TEST POINT(S) TP1 TP2 TP3 CONNECTOR TABLE 1. DESCRIPTION OF TEST POINTS DESCRIPTION LX1 (Input side of power inductor) LX2 (Output side of power inductor) V OUT TABLE 2. DESCRIPTION OF CONNECTORS DESCRIPTION J1 Header for connecting input power. Includes S+ and S- sense lines. J2 Header for connecting external load. Includes S+ and S- sense lines. JUMPER J3 J4 TABLE 3. DESCRIPTION OF JUMPERS Quick Setup Guide DESCRIPTION Jumper to select EN input logic state. Set EN = V IN to enable device, or set EN = GND to disable device. Jumper to select MODE input logic state. Set MODE = V IN to enable auto-pfm mode, or set MODE = GND to select forced PWM mode. To use external sync feature, remove this jumper and apply an external clock between 2.75MHz and 3.25MHz on the center pin on the J4 header. 1. Install jumper on J3, shorting EN to VIN. 2. Install jumper on J4, shorting MODE to VIN. 3. Connect power supply to J1, with voltage setting between 1.8V and 5.5V. 4. Connect electronic load to J2. 5. Place scope probes on VOUT testpoint, and other testpoints of interest. 6. Turn on the power supply. 7. Monitor the output voltage startup sequence on the scope. The waveforms will look similar to that shown in Figures 1 and Turn on the electronic load. 9. Measure the output voltage with the voltmeter. The voltage should regulate within data sheet spec limits. 10. To determine efficiency, measure input and output voltages at the Kelvin sense testpoints (S+ and S-) which are part of J1 and J2 headers. The bench power supply can be connected to the PVIN and GND headers on J1. The electronic load can be connected to the VOUT and GND headers on J2. Measure the input and output currents. Calculate efficiency based on these measurements. 11. To test external sync, remove the jumper at J4, then apply an external clock between 2.75MHz and 3.25MHz on the MODE input (the center pin of header J4). AN CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures INTERSIL or Copyright Intersil Americas LLC 2013, All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners.
2 Typical Start-up Waveforms LX1 LX2 V OUT EN 400µs/DIV V IN = 2V V OUT = 3.3V I OUT = 200mA FIGURE 1. ISL91108 START-UP WITH V IN = 2V and V OUT = 3.3V Output Voltage Programming The ISL91108IIA-EVZ evaluation board uses resistors to program the output voltage. To change the output voltage, resistor R1 should be removed and replaced with a resistor value corresponding to the desired output voltage, as shown in Table 4. A precision resistor with 1% tolerance should be used. TABLE 4. OUTPUT VOLTAGE PROGRAMMING DESIRED OUTPUT VOLTAGE (V) R1 RESISTOR VALUE (kω) LX1 LX2 V OUT EN 400µs/DIV V IN = 4V V OUT = 3.3V I OUT = 200mA FIGURE 2. ISL91108 START-UP WITH V IN = 4V and V OUT = 3.3V 2 AN1903.1
3 ISL91108IIA-EVZ Evaluation Board Schematic FIGURE 3. ISL91108IIA-EVZ EVALUATION BOARD SCHEMATIC TABLE 5. ISL91108IIA-EVZ EVALUATION BOARD BILL OF MATERIALS ITEM# QTY DESIGNATORS PART TYPE FOOTPRINT DESCRIPTION VENDORS 1 1 U1 ISL91108IIAZ W4x5.20 WLCSP Intersil ISL91108 Buck-Boost Regulator with Adjustable Output Voltage INTERSIL 2 1 L1 1µH 3.2mmx2.5mm Power Inductor DFE322512C, 4.6A, 34mΩ TOKO 3 1 C1 330µF 7343 Capacitor, Tantalum ANY 4 2 C2, C3 10µF/16V/X5R 0603 Capacitor, Ceramic, GRM188R61C106MA73D Murata 5 2 C4, C5 22µF/10V/X5R 0603 Capacitor, Ceramic, GRM188R61A226M Murata 6 1 C6 22pF/50V/NP Capacitor, Generic ANY 7 1 C7 0.1µF 0402 Capacitor, Generic ANY 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 3 TP1, TP2, TP3 SCOPEPROBE SCOPEPROBE Test Point, Scope Probe TEKTRONIX 3 AN1903.1
4 ISL91108IIN-EVZ Evaluation Board Schematic FIGURE 4. ISL91108IIN-EVZ EVALUATION BOARD SCHEMATIC TABLE 6. ISL91108IIN-EVZ EVALUATION BOARD BILL OF MATERIALS ITEM# QTY DESIGNATORS PART TYPE FOOTPRINT DESCRIPTION VENDORS 1 1 U1 ISL91108IINZ W4x5.20 WLCSP Intersil ISL91108 Buck-Boost Regulator with Fixed 3.3V Output Voltage INTERSIL 2 1 L1 1µH 3.2mmx2.5mm Power Inductor DFE322512C, 4.6A, 34mΩ TOKO 3 1 C1 330µF 7343 Capacitor, Tantalum ANY 4 2 C2, C3 10µF/16V/X5R 0603 Capacitor, Ceramic, GRM188R61C106MA73D Murata 5 2 C4, C5 22µF/10V/X5R 0603 Capacitor, Ceramic, GRM188R61A226M Murata 6 1 C6 DNP 0402 ANY 7 1 C7 0.1µF 0402 Capacitor, Generic ANY 8 1 R1 0Ω 0402 Resistor, Generic ANY 9 1 R2 DNP 0402 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 3 TP1, TP2, TP3 SCOPEPROBE SCOPEPROBE Test Point, Scope Probe TEKTRONIX 4 AN1903.1
5 ISL91108 Evaluation Board Layout Application Note 1903 FIGURE 5. ISL91108 EVALUATION BOARD LAYOUT FIGURE 6. TOP LAYER 5 AN1903.1
6 ISL91108 Evaluation Board Layout (Continued) FIGURE 7. MID LAYER FIGURE 8. MID LAYER 2 6 AN1903.1
7 ISL91108 Evaluation Board Layout (Continued) FIGURE 9. BOTTOM LAYER Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see 7 AN1903.1
8 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Intersil: ISL91108IIA-EVZ ISL91108IIN-EVZ ISL91108IINR-EVZ
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