Renesas EL7566DRE

Overview

EL7566DRE from Intersil is a monolithic synchronous step-down DC/DC regulator delivering up to 6A continuous output current with 96% peak efficiency. It operates from a 3V–6V input, supports adjustable output down to 0.8V, and integrates PMOS/NMOS power FETs in a 28-lead HTSSOP package. Used in FPGA core supplies and DSP point-of-load applications requiring tight voltage margining and thermal monitoring.

For engineers reviewing the EL7566DRE datasheet, EL7566DRE pinout, EL7566DRE application, or EL7566DRE equivalent, key selection considerations include its 100% duty cycle capability, ±5% programmable voltage margining, junction temperature indicator (VTJ), and synchronization-ready PWM architecture operating up to 1MHz.

Technical Context

The EL7566DRE employs peak current-mode control with on-chip resistorless current sensing for fast transient response. Its PWM controller uses a relaxation oscillator with external COSC capacitor tuning and supports external synchronization via STP/STN pins.

It integrates overtemperature shutdown (135°C trip, 20°C hysteresis), overvoltage protection (110% of VOUT), and digital soft-start (2ms default, extendable). The internal 20Ω VDD feed resistor and 2.5µA EN pull-up enable standalone operation without external bias components.

Key Specifications

Pinout & Package

EL7566DRE is housed in a thermally enhanced 28-lead HTSSOP (MDP0048) with exposed thermal pad, rated for 0°C to +85°C ambient operation. The package requires soldering of the thermal pad to PCB ground plane and use of thermal vias for reliable 6A operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54620RGYR and ISL85415EVAL1Z, the EL7566DRE uniquely combines 6A current capability, ±5% voltage margining, VTJ thermal monitoring, and multi-supply tracking in a single IC-making it optimal for production testability and thermal-aware embedded systems.

Availability

EL7566DRE is available at Aetrix Electronics and suitable for FPGA core supplies, DSP point-of-load converters, and CPU voltage regulators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for EL7566DRE 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 for industrial, computing, and communications markets.

The EL7566DRE belongs to Intersil's monolithic synchronous buck regulator product line, engineered for high-current, thermally demanding point-of-load applications where integration, accuracy, and built-in test features are critical.

FAQ

What is the maximum output voltage achievable with the EL7566DRE?

The EL7566DRE supports up to 100% duty cycle operation due to its integrated PMOS high-side switch, enabling VOUT as high as VIN minus conduction losses. With typical RDSON1 of 30mΩ and inductor DCR, the EL7566DRE can deliver ~4.9V from a 5V input. Output voltage is set externally via FB pin resistor divider per VOUT = 0.8V × (1 + R1/R2).

How does the EL7566DRE implement voltage margining for production testing?

The EL7566DRE implements ±5% voltage margining using dedicated TM and SEL pins. When TM = high and SEL = high, VOUT shifts +5%; when TM = high and SEL = low, VOUT shifts –5%. Both pins must be tied to SGND (directly or via 10kΩ) to disable margining. This feature is explicitly documented in Table 2 of the FN7102 datasheet and verified in Figure 16 waveforms.

Can the EL7566DRE synchronize its switching frequency to an external clock?

Yes, the EL7566DRE supports external synchronization via its STP and STN pins. As described in Figure 20 and the "Full Start-Up Control" section, an external sync source can be applied through a level-shifting circuit to force the PWM controller to align switching edges. The datasheet specifies selecting a self-switching frequency 20% lower than the sync frequency to accommodate component tolerances.

What thermal management practices are required for reliable 6A operation of the EL7566DRE?

Reliable 6A operation of the EL7566DRE requires soldering the exposed thermal pad to a PCB ground plane with ≥6 thermal vias (13–25 mil) connecting to inner-layer ground planes. Layout must separate PGND and SGND, minimize high-current loop area (LX→inductor→COUT→PGND), and maximize copper pour under the IC. Thermal resistance drops to 26°C/W with proper 2-layer PCB implementation, per Figure 9.

Does the EL7566DRE provide overvoltage protection, and how does it behave during fault conditions?

Yes, the EL7566DRE includes overvoltage protection that triggers when VOUT exceeds 110% of the regulated setpoint. Upon detection, it turns off the high-side PMOS, turns on the low-side NMOS, and pulls PG low. The device does not latch off; instead, it automatically initiates a new soft-start sequence once the fault condition clears, as confirmed in the "Protection Features" section on page 10 of FN7102 Rev 7.00.