USERS MANUAL ISL91133IIx-EVZ AN1958 Rev 0.00 Evaluation Board September 5, 2014 Description Key Features The ISL91133 is an integrated boost with bypass switching Jumper selectable EN (Enabled/Disabled) regulator for battery powered applications. The device provides Jumper selectable BYPS (Auto/Forced) a power supply solution for products using one cell Li-ion or Jumper selectable VSET (No offset/offset on V ) OUT Li-polymer battery. The device is capable of delivering up to 2.3A output current from V = 2.5V and V = 3.3V. The Connectors, test points, and jumpers for easy probing IN OUT no-load quiescent current is only 108 A in Boost mode and 45A in Forced Bypass mode, which significantly reduces the Related Literature standby consumption. The ISL91133 evaluation board allows For a full list of related documents, visit our website quick evaluation of the high performance features of this regulator. ISL91133 device page Specifications Ordering Information The boards are designed to operate at the following operating EVALUATION BOARD NUMBER V OPTION OUT conditions: ISL91133IIL-EVZ 3.15/3.3V (VSET L/H) Input voltage rating from 2.35V to 5.4V ISL91133IIM-EVZ 3.3/3.5V (VSET L/H) Output current: up to 2.3A (V = 2.5V, V = 3.3V) IN OUT ISL91133IIN-EVZ 3.5/3.7V (VSET L/H) Forced bypass or Auto Bypass modes with a 38m switch ISL91133IIO-EVZ 3.7/3.77V (VSET L/H) PFM mode at light-load currents ISL91133IIP-EVZ 4.5/4.76V (VSET L/H) 108A quiescent current minimizes standby consumption in Boost mode ISL91133IIQ-EVZ 5.0/5.2V (VSET L/H) 2.5MHz switching frequency FIGURE 1. ISL91133 TYPICAL APPLICATION SCHEMATIC AN1958 Rev 0.00 Page 1 of 7 September 5, 2014ISL91133IIx-EVZ 10. Measure the output voltage with the voltmeter. The voltage Functional Description should regulate within datasheet specification limits. The ISL91133 implements a complete boost switching regulator, 11. To determine efficiency, measure input and output voltages with PWM controller, internal switches, references, protection at the test points J1 and TP3. The bench power supply can be circuitry, and bypass control. The ISL91133 is designed to connected to the PVIN and GND headers on J1. The electronic support six fixed output voltage options. A voltage select pin load can be connected to the V and GND headers on J2 OUT (VSET) is available to scale up the output voltage by a small Measure the input and output currents and calculate offset to compensate the load transient droop. The evaluation efficiency based on these measurements. boards have been functionally optimized for best performance of the ISL91133. This part requires only an inductor and a few external components to operate. The 2.5MHz switching frequency further reduces the size of external components. The input power and load connections are provided through multi-pin connectors for high current operations. The ISL91133 evaluation board is shown in Figures 3 and 4. The boards enable function is controlled by the on-board jumper header J3. Similarly, the VSET function is controlled by the on-board jumper header J4, and the BYPASS function can be set to Forced or Auto mode by controlling the on-board jumper header J5. The schematic of the ISL91133IIM-EVZ evaluation board is shown on page 4. The PCB layout images for all layers are shown in Figures 5 and 6. The bill of materials of the ISL91133IIx-EVZ is shown in Table 1 on page 4. Operating Range The V range of the boards is 2.35V to 5.4V. The V for the IN OUT ISL91133 can range from 3.15V to 5.2V. The I range of the OUT boards is 0 to 2.3A. The operating ambient temperature range is FIGURE 2. STARTUPWAVEFORM50 LOAD -40C to +85C. Layout Considerations Quick Start Guide 1. C is used to compensate for line drops on cables from the For the ISL91133 board, the default output can be selected 1 power supply to the IC, this is not required for the actual board based on Table 1. design. Refer to the following Quick Setup Guide to configure and ) close to the IC to reduce V 2. Place the input capacitor (C 2 IN power-up the board for proper operation. During the power-on spikes/noise. process, the expected waveforms are shown in Figure 2. 3. Place the output capacitors (C , C ) as close as possible to 3 4 the IC to minimize V spikes. OUT Quick Setup Guide 4. Connect the boost inductor (L ) between VIN and LX using 1 1. Install jumpers on J3 shorting EN to VIN. short and wide traces. It is recommended to use multiple vias 2. Install jumper on J5 shorting BYPS to VIN, Auto Bypass mode. between the LX pin and the inductor. Three vias of 7 mils width were used on the evaluation board. 3. Install jumper on J4 shorting VSET to GND or leave it as NC. 5. Renesas recommends maximizing the copper pour area for 4. Connect power supply to J1, with voltage setting between VIN, VOUT, and GND for better thermal performance. 2.35V and 5.4V. 6. Connect AGND and PGND of the IC to each other. It is crucial 5. Connect electronic load to J2. to connect these two grounds at a location very close to the IC. 6. Place scope probes on VOUT test point, and other test points of interest. 7. Turn on the power supply. 8. Monitor the output voltage (refer to ordering information) when V < V (Boost mode), V = V when V > V IN OUT IN OUT IN OUT 1.015 * V (Bypass mode), the supply current should be OUT ~110A (Boost mode) and ~95A (Auto Bypass mode). pin = GND), supply current In Forced Bypass mode (BYPS should be ~45A. 9. Turn on the electronic load. AN1958 Rev 0.00 Page 2 of 7 September 5, 2014