DATASHEET ISL8117A FN8752 Rev 0.00 Synchronous Step-Down PWM Controller August 31, 2015 The ISL8117A is a synchronous buck controller to generate Features POL voltage rails and bias voltage rails for a wide variety of Wide input voltage range: 4.5V to 60V applications in industrial and general purpose segments. Its wide input and output voltage ranges make it suitable for Wide output voltage range: 0.6V to 54V telecommunication and after-market automotive applications. Light-load efficiency enhancement ISL8117A is a derivative from the ISL8117 by replacing its - Low ripple diode emulation mode with pulse skipping CLKOUT pin with COMP pin to provide flexibility to customers to configure the voltage loop compensation externally. Programmable soft-start The ISL8117A uses the valley current modulation technique to Supports prebiased output with SR soft-start bring a hassle-free power supply design with minimal number of Programmable frequency: 100kHz to 2MHz components and complete protection from unwanted events. External sync The ISL8117A offers programmable soft-start and enable PGOOD indicator functions along with a power-good indicator for ease of supply rail sequencing and other housekeeping requirements. In ideal Forced PWM situations, a complete power supply circuit can be designed Adaptive shoot-through protection with 10 external components and provide OV/OC/OT No external current sense resistor protections in a space conscious 16 Ld 4mmx4mm QFN - Use lower MOSFET r package. The package uses an EPAD to improve thermal DS(ON) dissipation and noise immunity. Low pin count, less number of Functional pins with default design values external components and default internal values, makes the - EN, RT, SS/TRK, MOD/SYNC, LGATE/OCS ISL8117A an ideal solution for quick to market simple power supply designs. The ISL8117A utilizes single resistor settings Complete protection for other functions such as operating frequency and - Overcurrent, overvoltage, over-temperature, undervoltage overcurrent protection. Its current mode control with V IN Pb-free (RoHS compliant) feed-forward enables it to cover various applications. The unique DEM/Skipping mode at light load dramatically lowers Applications standby power consumption with consistent output ripple over different load levels. PLC and factory automation Industrial equipments Related Literature Security surveillance UG049, ISL8117AEVAL1Z Evaluation Board User Guide Server and data centers UG050, ISL8117AEVAL2Z Evaluation Board User Guide Switcher and routers Telecom and datacom LED panels VIN 100 16 15 14 13 98 MOD 1 12 UGATE SYNC 96 2 11 PGOOD PHASE 94 ISL8117A SGND 92 3 RT ISEN 10 90 V = 60V IN SS VOUT V = 24V 4 VCC5V 9 IN TRK V = 48V 88 IN V = 18V IN V = 36V IN 86 5 6 7 8 84 0 2 4 6 8 10 12 14 16 OUTPUT CURRENT (A) FIGURE 2. EFFICIENCY FIGURE 1. TYPICAL APPLICATION FN8752 Rev 0.00 Page 1 of 23 August 31, 2015 COMP EN EXT FB BIAS PGND VIN LGATE BOOT OCS EFFICIENCY (%)ISL8117A Table of Contents Ordering Information 3 Pin Configuration 3 Pin Descriptions . 3 Block Diagram 5 Typical Application Schematics 6 Absolute Maximum Ratings . 7 Thermal Information . 7 Recommended Operating Conditions 7 Electrical Specifications . 7 Typical Performance Curves . 10 Functional Description 14 General Description 14 Input Voltage Range . 14 Internal 5V Linear Regulator (VCC5V) and External VCC Bias Supply (EXTBIAS) 14 Enable and Soft-Start Operation . 14 Output Voltage Programming . 14 Tracking Operation 15 Light-Load Efficiency Enhancement 15 Prebiased Power-Up .15 Frequency Selection . 15 Frequency Synchronization .15 Gate Control Logic . 15 Gate Driver . 15 Adaptive Dead Time . 16 Internal Bootstrap Diode 16 Power-Good Indicator 16 Protection Circuits 16 Undervoltage Lockout 16 Overcurrent Protection . 16 Overvoltage Protection . 17 Over-Temperature Protection 17 Feedback Loop Compensation . 17 Layout Guidelines 19 Layout Considerations 19 General PowerPAD Design Considerations 20 Component Selection Guideline 20 MOSFET Considerations 20 Output Inductor Selection . 20 Output Capacitor Selection 20 Input Capacitor Selection . 21 Revision History 22 About Intersil 22 Package Outline Drawing 23 FN8752 Rev 0.00 Page 2 of 23 August 31, 2015