Application Note 1679 Author: Silas Lin ISL9111H30/33/50/ADJZEVAL1Z Evaluation Board User Guide Evaluation Board Features TABLE 2. DESCRIPTION OF JUMPERS • ISL9111H30/33/50/ADJZEVAL1Z is a low input voltage, high efficiency boost regulator with fixed (3.0/3.3/5.0V) and adjustable output voltage • Input voltage rating from 0.8V to 5.0V • 100mA output current at VIN = 0.9V and VOUT = 3.3V and 240mA at VIN = 1.8V and VOUT = 3.3V • 1.2MHz switching frequency • Connectors, test points and jumpers for easy evaluation • Electronic load • Multimeter to measure voltages and currents • Oscilloscope • Test Points, Connectors and Jumpers TABLE 1. DESCRIPTION OF CONNECTOR CONNECTOR DESCRIPTION J1 VIN (Input Supply) J2 GND (System ground) J3 Power supply for FAULT pin pull-up J4 VOUT (Output Voltage) J5 GND (System ground) J6 Fault Output (Fixed output version). JP1 Jumper to select EN input logic state. Set EN = VIN to enable device, or set EN = GND to disable device. JP3 Jumper to select LED indication for FAULT conditions. Quick Setup Guide 2. Connect electronic load to J4. • Jumper selectable for LED indication during FAULT conditions • Power supply capable of delivering up to 5.5V and 1A DESCRIPTION 1. Connect power supply to J1, with voltage setting between 0.8V and 5.0V. • Jumper selectable EN (enabled/disabled) Required Equipment JUMPER 3. Place scope probes on VOUT test point, and other test points of interest. 4. Turn on the power supply. 5. Assert EN pin high to enable the device. 6. Monitor the output voltage start-up sequence on the scope. The waveforms will look similar to Figure 1. 7. Turn on the electronic load. 8. Measure the output voltage with the voltmeter. The voltage should regulate within data sheet spec limits (FN7602). Typical Start-up Waveforms VIN = 3.6V, VOUT = 5.0V, ILOAD = 200mA FIGURE 1. ISL9111 START-UP WITH VIN = 3.6V AND VOUT = 5.0V November 30, 2011 AN1679.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011. 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. Application Note 1679 Output Voltage Programming (ADJ Version) R 1⎞ ⎛ V O = V FB • ⎜ 1 + -------⎟ R ⎝ 2⎠ Output Voltage Setting Resistor Selection The voltage divider resistors, R1 and R2, as shown in the evaluation board schematic for the ADJ version, set the desired output voltage values. The output voltage can be calculated using Equation 1: (EQ. 1) where VFB is the internal feedback reference voltage (0.8V typical). The current flowing through the divider resistors is calculated as VO/(R1 + R2). Large resistance is recommended to minimize the current into the divider; thus improving the total efficiency of the converter. Evaluation Board Schematics FIGURE 2. ISL9111H3.0/3.3/5.0EVAL1Z EVALUATION BOARD SCHEMATIC TABLE 3. ISL9111H3.0/3.3/5.0EVAL1Z EVALUATION BOARD BILL OF MATERIALS ITEM# QTY DESIGNATORS PART TYPE FOOTPRINT DESCRIPTION VENDORS 1 1 U1 ISL9111 or ISL9111A SOT23-6L Intersil ISL9111 Boost Regulator INTERSIL 2 1 L1 4.7µH 0.126”x0.126” CDRH2D18/HPNP-4R7NC SUMIDA 3 2 C1, C2 4.7µF/6.3V/X5R 0603 GRM21BR71C475KA73L MURATA 4 1 C3 Place Holder 0805 5 1 R1 OPEN 0402 Resistor, Generic ANY 6 1 R2 OPEN 0402 Resistor, Generic ANY 7 2 R3, R4 1kΩ 0603 Resistor, Generic ANY 8 1 R5 0Ω 0603 Resistor, Generic ANY 9 1 D1 LED 0805 LED, RED, SMD ANY 10 6 J1, J2, J3, J4, J5, J6 POWER POST Connectors ANY 11 2 JP1, JP3 JUMPER 2 HDR-3 ANY ANY AN1679.0 November 30, 2011 Application Note 1679 Evaluation Board Schematics (continued) FIGURE 3. ISL9111ADJEVAL1Z EVALUATION BOARD SCHEMATIC TABLE 4. ISL9111HADJ-EVAL1Z EVALUATION BOARD BILL OF MATERIALS ITEM# QTY DESIGNATORS PART TYPE FOOTPRINT DESCRIPTION VENDORS 1 1 U1 ISL9111 or ISL9111A SOT23-6L Intersil ISL9111 Boost Regulator INTERSIL 2 1 L1 4.7µH 0.126”x0.126” CDRH2D18/HPNP-4R7NC SUMIDA 3 2 C1, C2 4.7µF/6.3V/X5R 0603 GRM21BR71C475KA73L MURATA 4 1 C3 Place Holder 0805 5 1 R1 665k 0402 Resistor, Generic ANY 6 1 R2 166k 0402 Resistor, Generic ANY 7 2 R3, R4 1kΩ 0603 Resistor, Generic ANY 8 1 R5 0Ω 0603 Resistor, Generic ANY 9 1 D1 LED 0805 LED, RED, SMD ANY 10 6 J1, J2, J3, J4, J5, J6 POWER POST Connectors ANY 11 2 JP1, JP3 JUMPER 3 HDR-3 ANY ANY AN1679.0 November 30, 2011 Application Note 1679 Evaluation Board Layout FIGURE 4. ISL9111 EVALUATION BOARD SILKSCREEN TOP FIGURE 5. ISL9111 EVALUATION BOARD TOP COPPER 4 AN1679.0 November 30, 2011 Application Note 1679 Evaluation Board Layout (Continued) FIGURE 6. ISL9111 EVALUATION BOARD BOTTOM COPPER 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 www.intersil.com 5 AN1679.0 November 30, 2011