USERS MANUAL ISL85413DEMO1Z, ISL85412DEMO1Z AN1931 Rev 1.00 Wide VIN Synchronous Buck Regulator - Short Form Demonstration Boards March 13, 2015 Description Key Features The ISL85413DEMO1Z, ISL85412DEMO1Z kit is intended for Wide input voltage range 3.5V to 40V use for point-of-load applications sourcing from 3.5V to 40V. Synchronous operation for high efficiency The kit is used to demonstrate the performance of the No compensation required ISL85413, ISL85412 Wide V Low Quiescent Current High IN Efficiency Synchronous Buck Regulator with 300mA Integrated high-side and low-side NMOS devices (ISL85413) and 150mA (ISL85412) output current. Selectable PFM or forced PWM mode at light loads The ISL85413, ISL85412 is offered in a 3mmx3mm 8 Ld DFN Continuous output current up to 300mA (ISL85413) and package with 1mm maximum height. 150mA (ISL85412) Internal soft-start Recommended Equipment Minimal external components required The following materials are recommended to perform testing: Power-good and enable functions available 0V to 50V power supply with at least 2A source current capability References Electronic loads capable of sinking current up to 1.5A ISL85412 Datasheet Digital Multimeters (DMMs) ISL85413 Datasheet 100MHz quad-trace oscilloscope Signal generator Ordering Information PART NUMBER DESCRIPTION ISL85412DEMO1Z Demonstration Board (150mA Output Current) ISL85413DEMO1Z Demonstration Board (300mA Output Current) FIGURE 1. FRONT OF EVALUATION BOARD ISL85413DEMO1Z, ISL85412DEMO1Z AN1931 Rev 1.00 Page 1 of 4 March 13, 2015ISL85413DEMO1Z, ISL85412DEMO1Z Disabling/Enabling Function Quick Setup Guide The ISL85413DEMO1Z, ISL85412DEMO1Z boards have the EN 1. Ensure that the circuit is correctly connected to the supply and pin tied to V via R . This keeps the part enabled all the time. To CC 7 loads prior to applying any power. and populate R with a 0 resistor. disable the part, remove R 7 8 2. Connect the bias supply to VIN, the plus terminal to VIN (P4) MODE Control and the negative return to GND (P5). The ISL85413 and ISL85412 evaluation boards have a MODE pin 3. Turn on the power supply. that allows different mode operation. The Default board 4. Verify the output voltage is 3.3V for V OUT. configuration has R = 200k to V , which defaults to PWM 6 CC operation mode. If this pin is tied to GND the IC will operate in Evaluating the Other Output Voltage PFM mode. The ISL85413DEMO1Z, ISL85412DEMO1Z kit output is preset to 3.3V however, output voltages can be adjusted from 0.6V to 15V. and ISL85412 datasheet Please refer to application note AN1929 for further information. R1 90.9K 2 1 U1 C4 VO 1 8 MODE FB 1 8 C3 1 2 2 7 BOOT VCC 2 7 330PF 1 VIN PG P4 0.1UF 3 6 ISL85413 3 6 L1 P7 1 EN 2 12 4 5 PHASE 4 5 R2 33UH 9 C9 20K EP VO C1 C2 C5 1 1UF C10 C6 22UF 150UF 10UF 10UF OPEN L8.3X3H P5 A 1 A P9 1 A VCC VIN R6 R7 200K 200K MODE EN 1 P1 PG 1 P2 2 2 R8 R9 OPEN OPEN 1 1 A A NOTE: If the IC is used in an application where the input test leads have large parasitic inductance, the input electrolytic capacitor C may be added to prevent transient voltages on the input pin. 10 FIGURE 2. ISL85413DEMO1Z AND ISL85412DEMO1Z SCHEMATIC AN1931 Rev 1.00 Page 2 of 4 March 13, 2015 21 21 2 1 21 21 12