ISL8126 ISL8126 ISL8126 DATASHEET ISL8126 FN7892 Rev.2.00 Dual/n-Phase Buck PWM Controller with Integrated Drivers January 29, 2015 The ISL8126 integrates two voltage-mode PWM leading-edge Features modulation control with input feed-forward synchronous buck Wide V range operation: 3V to 26.5V PWM controllers to control dual independent voltage IN regulators or a 2-phase single output regulator. It also - VCC operation from 3V to 5.60V integrates current sharing control for the power module to Excellent output voltage regulation: 0.6V internal reference operate in parallel, which offers high system flexibility. Frequency synchronization with programmable phase delay The ISL8126 integrates an internal linear regulator, which up to 12-phase applications generates ICs bias voltages for applications with only one Fault spreading capability for high system reliability single supply rail. The internal oscillator is adjustable from 150kHz to 1.5MHz, and is able to synchronize to an external Digital soft-start with precharged output start-up capability clock signal for frequency synchronization and phase Dual independent channel enable inputs with precision paralleling applications. Its PLL circuit can output a voltage monitor and voltage feed-forward capability phase-shift-programmable clock signal for the system to be - Programmable input voltage POR and its hysteresis with a expanded to 3-, 4-, 6- and 12- phases with desired interleaving resistor divider at EN input phase shift. Extensive circuit protection functions: output overvoltage, The ISL8126s Fault Spreading feature protects any channel undervoltage, overcurrent protection, over-temperature and from overloading/stressing due to system faults or phase pre-power-on-reset overvoltage protection option failure. The undervoltage fault protection features are also designed to prevent a negative transient on the output voltage Applications during falling down. This eliminates the Schottky diode that is used in some systems for protecting the load device from Power supply for Datacom/Telecom and POL reversed output voltage damage. Paralleling power module Wide and narrow input voltage range buck regulators Related Literature TB389 PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages AN1713, ISL8126EVAL1Z Evaluation Board User Guide o VO 0 VO1 VIN VIN o o Vo 0 90 VO2 o 180 o o 180 270 DUAL REGULATOR TWO-PHASE REGULATOR FOUR-PHASE REGULATOR FIGURE 1. TYPICAL APPLICATION DIAGRAM FN7892 Rev.2.00 Page 1 of 39 January 29, 2015 VIN ISL8126ISL8126 Table of Contents Pin Configuration 3 Functional Pin Descriptions . 3 Ordering Information 5 Controller Block Diagram . 6 Integrated Driver Block Diagram . 7 Typical Application Circuits . 8 2-Phase Operation with DCR Sensing .8 2-Phase Operation with rDS(ON) Sensing 9 Dual Regulators with DCR Sensing and Remote Sense 10 Double Data Rate I or II 11 3-Phase Regulator with Precision Resistor Sensing . 12 4-Phase Operation with DCR Sensing . 13 Multiple Power Modules in Parallel with Current Sharing Control 14 3-Phase Regulator with Resistor Sensing and 1-Phase Regulator . 15 6-Phase Operation with DCR Sensing . 16 Absolute Maximum Ratings 17 Thermal Information 17 Recommended Operating Conditions . 17 Electrical Specifications 17 Typical Performance Curves . 21 Modes of Operation . 22 Functional Description 25 Initialization 25 Voltage Feed-forward 25 Soft-start . 26 PRE-POR Overvoltage Protection (PRE-POR-OVP) . 28 Over-Temperature Protection (OTP) 28 Overcurrent Protection . 29 Current Sharing Loop 30 Current Share Control in Multiphase Single Output with Shared COMP Voltage 31 Current Share Control Loop in Multi-Module with Independent Voltage Loop 32 Internal Series Linear and Power Dissipation 32 Oscillator . 33 Frequency Synchronization and Phase Lock Loop 33 Differential Amplifier for Remote Sensing . 34 Internal Reference and System Accuracy 35 DDR and Dual Mode Operation 36 Layout Considerations 36 Routing UGATE, LGATE and PHASE Traces . 37 Current Sense Component Placement and Trace Routing 37 General PowerPAD Design Considerations 37 Revision History 38 About Intersil 38 Package Outline Drawing 39 FN7892 Rev.2.00 Page 2 of 39 January 29, 2015