DATASHEET ISL8205M FN8755 Rev 4.00 5A Single Channel High Efficiency DC/DC Step-Down Power Module October 25, 2016 The ISL8205M power module is a single channel synchronous Features step-down complete power supply, capable of delivering up to 5A single channel complete power supply 5A of continuous current. Operating from a single 2.6V to 5.5V input power rail and integrating controller, power inductor and - Integrates controller, MOSFETs and inductor MOSFETs, the ISL8205M only requires a few external - Pin/function compatible with the 3A ISL8202M components to operate and is optimized for space constrained 2.6V to 5.5V input voltage range and portable battery operated applications. Adjustable output voltage range Based on current mode PWM control scheme, the ISL8205M - As low as 0.6V with 1.6% accuracy over provides a fast transient response and excellent loop stability line/load/temperature as well as a very low duty cycle with an adjustable output -Up to 95% efficiency voltage as low as 0.6V and better than 1.6% accuracy over line and load conditions. Operation frequency is selectable through Default 1.8MHz current mode control operations an external resistor, with a 1.8MHz default setting, or may be - 680kHz to 3.5MHz resistor adjustable synchronized with an external clock signal up to 3.5MHz. The - External synchronization up to 3.5MHz ISL8205M also implements a selectable PFM mode to improve light-load efficiency and a 100% duty cycle LDO mode - Selectable light-load efficiency mode to extend battery life. A programmable soft-start reduces the - 100% duty cycle LDO mode inrush current required from the input supply while an Programmable soft-start automatic output discharge ensures a soft stop. Dedicated enable pin and power-good flag allow for easy system power Soft-stop output discharge rails sequencing. Dedicated enable pin and power-good flag An array of protection features, including input Undervoltage UVLO, over-temperature, overcurrent, overvoltage and Lockout (UVLO), over-temperature, overcurrent/short-circuit negative overcurrent protections with hiccup mode, overvoltage and negative overcurrent, - Overcurrent/short-circuit hiccup mode guarantees safe operations under abnormal operating conditions. 4.5mmx7.5mmx1.85mm 22 Ld QFN package The ISL8205M is available in a compact RoHS compliant Applications 22 Ld 4.5x7.5x1.85mm QFN package. DC to DC POL power module Related Literature C/P, FPGA and DSP power TB389, PCB Land Pattern Design and Surface Mount Portable equipment Guidelines for QFN Packages Battery operated equipment UG072, ISL8205MEVAL1Z Evaluation Board User Guide 100.0 2.6V TO 5.5V ISL8205M 1.2V 5A 95.0 INPUT OUTPUT VIN VOUT 90.0 EN SW C COUT IN 85.0 2x22F 2x22F PG VSENSE 80.0 SYNC COMP 75.0 FS FB Vout=1.2V, Fsw=1.6MHz PWM SS 70.0 EPAD R SET Vout=1.2V, Fsw=1.6MHz PFM C FF 100k 820pF RFS SGND PGND Vout=3.3V, Fsw=3MHz PFM 65.0 124k Vout=3.3V, Fsw=3MHz PWM 60.0 0 0.5 1 1.5 22.5 33.5 44.5 5 LOAD CURRENT (A) FIGURE 1. TYPICAL APPLICATION DIAGRAM AT 5 , 1.2V , 1.6MHz f , 5A VIN OUT SW FIGURE 2. EFFICIENCY vs LOAD 5V IN FN8755 Rev 4.00 Page 1 of 25 October 25, 2016 EFFICIENCY (%)ISL8205M Table of Contents Functional Block Diagram 3 Pin Configuration 4 Pin Descriptions . 4 Ordering Information 5 Absolute Maximum Ratings . 6 Thermal Information . 6 Recommended Operating Conditions 6 Electrical Specifications . 6 Typical Performance Characteristics . 9 Efficiency .9 Output Voltage Ripple 9 Load Transient Response . 10 Start-Up 11 Short-Circuit Protection . 12 Overvoltage Protection . 13 Power Loss . 13 Derating . 13 Functional Description 15 PWM Control Scheme 15 PFM (Skip) Mode 15 Frequency Adjust 15 Overcurrent Protection . 15 Negative Current Protection . 16 Power-Good 16 UVLO 16 Soft Start-Up 16 External Synchronization Control . 16 Enable . 16 Discharge Mode (Soft-Stop) . 16 100% Duty Cycle 16 Thermal Shutdown 16 Applications Information 16 Programming the Output Voltage 16 Recommended Switching Frequency . 17 Input Capacitor Selection . 17 Output Capacitor Selection 17 Feed-Forward Capacitor Selection 17 Typical Application Circuit 18 Thermal Consideration and Current Derating 18 PCB Layout Recommendations . 19 Package Description . 20 PCB Layout Pattern Design . 20 Thermal Vias 20 Stencil Pattern Design . 20 Reflow Parameters 20 Revision History 21 About Intersil 21 Package Outline Drawing 22 FN8755 Rev 4.00 Page 2 of 25 October 25, 2016