Renesas EL7566DREZ

Overview

EL7566DREZ from Intersil is a monolithic synchronous step-down DC/DC regulator delivering up to 6A continuous output current with 96% peak efficiency, operating from 3V–6V input and supporting adjustable output voltages from 0.8V to near VIN. It integrates PMOS/NMOS power FETs, features 100% duty cycle capability, internal soft-start, ±5% voltage margining, and junction temperature monitoring - deployed in FPGA core supplies and high-density point-of-load applications.

For engineers reviewing the EL7566DREZ datasheet, EL7566DREZ pinout, EL7566DREZ application, or EL7566DREZ equivalent, key selection considerations include its 28-pin HTSSOP package with exposed thermal pad, fixed 0°C to +85°C ambient rating, integrated overtemperature and overvoltage protection, and programmable switching frequency up to 1MHz for compact PCB layout.

Technical Context

The EL7566DREZ employs peak current-mode control with on-chip resistorless current sensing derived from the upper PMOS switch, enabling fast transient response and stable operation across load and line variations. Its PWM oscillator supports external synchronization and adjustable frequency (300–440 kHz typical) via COSC capacitor, while digital soft-start enforces a 2ms controlled voltage ramp.

Thermal management relies on the exposed thermal pad of the HTSSOP-28 package, with junction temperature monitored via VTJ pin (1.2V + 3.84mV/°C offset), and shutdown triggered at 135°C with 20°C hysteresis. Protection includes overcurrent (7.8A peak limit), overvoltage (110% of VOUT), input undervoltage lockout (~2.8V POR), and thermal shutdown.

Key Specifications

Pinout & Package

EL7566DREZ is housed in a RoHS-compliant 28-pin HTSSOP package (MDP0048) with an exposed thermal pad requiring solder connection to PCB ground plane for thermal performance. Pin functions are validated per FN7102 Rev 7.00 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with MP2315DJ-LF-Z and TPS54620RGYT, EL7566DREZ uniquely combines 6A capability with voltage margining, junction temperature monitoring, and true 100% duty cycle - making it optimal for FPGA/CPU core supplies requiring manufacturing testability and ultra-low dropout in 3V–6V systems.

Availability

EL7566DREZ is available at Aetrix Electronics and suitable for FPGA core supplies, DSP processor rails, and logic/bus power distribution requiring stable component supply across industrial temperature grades and long-term production continuity.

Supply support for EL7566DREZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation (now part of Renesas Electronics) designs high-performance analog and power management ICs, emphasizing precision, efficiency, and integration for demanding embedded and industrial applications.

The EL7566 product line targets high-current, low-voltage point-of-load regulation in FPGA, CPU, and DSP systems - prioritizing thermal intelligence, startup flexibility, and test-ready features like voltage margining and junction monitoring.

FAQ

What is the operating temperature range for EL7566DREZ?

The EL7566DREZ is specified for 0°C to +85°C ambient operating temperature. This rating is confirmed in the Ordering Information table of FN7102 Rev 7.00, where EL7566DREZ is explicitly listed with "0 to 85" under TEMP RANGE. It does not support the -40°C extended range offered by the EL7566AIREZ variant.

Does EL7566DREZ support 100% duty cycle operation, and how is it achieved?

Yes, EL7566DREZ supports true 100% duty cycle operation, enabling output voltages approaching VIN. This is achieved using an integrated PMOS high-side switch instead of NMOS, eliminating the need for a bootstrap capacitor and allowing continuous conduction mode down to zero voltage drop across the high-side FET.

How is voltage margining implemented on EL7566DREZ?

Voltage margining on EL7566DREZ is implemented via two dedicated pins: TM (pin 6) and SEL (pin 7). As defined in Table 2 of FN7102 Rev 7.00, pulling TM high and setting SEL high yields +5% output shift, SEL low yields -5%, and both low maintains nominal output - all without external components or firmware changes.

What thermal protection mechanisms does EL7566DREZ include?

EL7566DREZ incorporates overtemperature shutdown at 135°C junction temperature with 20°C hysteresis, and provides real-time die temperature monitoring via the VTJ pin (1.2V + 3.84mV/°C). These features are documented in Absolute Maximum Ratings and Detailed Description sections of FN7102 Rev 7.00.

Is EL7566DREZ pin-compatible with EL7566AIREZ?

Yes, EL7566DREZ and EL7566AIREZ share identical 28-pin HTSSOP packaging (MDP0048), identical pinout, and identical electrical functionality per FN7102 Rev 7.00. The only differences are ambient temperature rating (0°C–85°C vs. -40°C–85°C) and presence of overvoltage protection (included in EL7566DREZ, omitted in EL7566AIREZ).