ISL78264ARZ-T7A Renesas

Datasheet ISL78264 Automotive Dual Synchronous Buck Controller with Integrated Drivers The ISL78264 is a dual buck controller that can Features operate across a wide V range of 3.75V to 42V. It is IN V operating range: 3.75V to 42V IN designed to support wide duty-cycle operation for Low quiescent current: 6A typical, one channel switching frequencies from 200kHz up to 2.2MHz. To mitigate EMI, it supports synchronization to an Switching frequency: 200kHz to 2.2MHz external clock or programmable spread spectrum Dropout mode for high duty-cycle operation clocking. Its current-mode modulator is ideally suited to tolerate severe line transients. Also, the ISL78264 25ns on-times for low duty-cycle operation supports dropout operation and low 25ns on-time to External synchronization operate through automotive cranking and load dump Programmable spread spectrum clocking pulses. 180 phase shift between channels The ISL78264 integrates robust MOSFET drivers and readily supports step-down applications requiring high 2A Sourcing/3A sinking MOSFET drivers output currents in normal operation. For applications Boot UVLO and programmable boot refresh time that must also sustain extremely low power, Extensive protection mechanisms for always-on operation, its energy conservation mode OV/UV/OC/OT can reduce operating current to 6A. Integrated feedback for VOUT1 is provided for 3.3V or 5V Table 1. Output Configurations applications to eliminate the current otherwise flowing in external feedback resistors. An automatic VOUT1 Selection VOUT2 Selection switchover to an external supply is also supported to 3.3V Adjustable 0.8V to 32V maximize efficiency. A blocking diode is activated 5.0V after startup to prevent the external supply from Adjustable 0.8V to 5V back-biasing a low input voltage at VIN. The ISL78264 is qualified to AEC-Q100 Grade 1, Applications specified to operate across an ambient temperature Automotive 12V Systems range of -40C to 125C, and is available in a 5mmx5mm, 32 Ld WFQFN (Wettable Flank) package. Infotainment/Multimedia Systems Cockpit safety systems Related Literature Advanced Driver Assist Systems (ADAS) For a full list of related documents, visit our website: ISL78264 device page VCC VBAT ISL78264 VIN 100 VBAT BOOT2 90 HS2 EXTSUP VOUT2 LX2 80 LS2 VCC 70 ISEN2P 60 VSEL ISEN2N CNT FB2 CNT2 50 Eff-8Vin-ECM VBAT EN1 Eff-12Vin-ECM BOOT1 40 PGOOD1 HS1 Eff-16Vin-ECM VOUT1 COMP1 30 LX1 EN2 Eff-8Vin-CCM LS1 20 PGOOD2 Eff-12Vin-CCM ISEN1P COMP2 10 Eff-16Vin-CCM SYNC ISEN1N RT FB1 0 SGND PGND 0.01 0.1 1 10 I (A) OUT Figure 2. Buck 1 Efficiency VOUT1 = 5V at 400 kHz Figure 1. Typical Application Schematic R33DS0002EU0100 Rev.1.00 Page 1 of 31 Jul.24.20 Efficiency (%)ISL78264 Contents 1. Overview . 3 1.1 Typical Application Schematics . 3 1.2 Block Diagram 5 1.3 Ordering Information . 5 1.4 Pin Configuration 6 1.5 Pin Descriptions . 6 2. Specifications . 8 2.1 Absolute Maximum Ratings 8 2.2 Thermal Information 8 2.3 Recommended Operation Conditions 8 2.4 Electrical Specifications . 9 3. Typical Performance Curves 13 4. Functional Description 17 4.1 Functional Overview 17 4.2 Buck Stage (Converter 1) 18 4.3 Buck Stage (Converter 2) 20 4.4 Over-Temperature Shutdown 21 4.5 Energy Conservation Mode (ECM) . 21 5. Application Information 24 5.1 Buck Converter 24 6. Control Loop Compensation for the Buck Regulators . 27 7. Recommended PCB Layout 28 8. Revision History 30 9. Package Outline Drawing 31 R33DS0002EU0100 Rev.1.00 Page 2 of 31 Jul.24.20