Renesas EL7564CREZ-T7

Overview

EL7564CREZ-T7 from Intersil is a monolithic synchronous step-down DC/DC regulator delivering 4A continuous output current with adjustable 1.0V–3.8V output, 95% peak efficiency, and integrated high- and low-side NMOS FETs. It operates at fixed-frequency PWM up to 1 MHz, supports external synchronization, and includes junction temperature monitoring and power-good indication for DSP/CPU core supply applications.

For engineers reviewing the EL7564CREZ-T7 datasheet, EL7564CREZ-T7 pinout, EL7564CREZ-T7 application, or EL7564CREZ-T7 equivalent, key selection considerations include its 28-pin HTSSOP package with exposed thermal pad, ±0.5% load/line regulation, 135°C overtemperature shutdown, and auxiliary supply tracking for multi-rail sequencing in embedded power systems.

Technical Context

The EL7564CREZ-T7 implements current-mode control using patented on-chip resistorless current sensing, enabling cycle-by-cycle current limiting and fast step-load response. Its PWM controller sums feedback voltage, current sense signal, slope compensation ramp, and power tracking inputs via a direct-summing comparator.

It integrates dual NMOS power FETs (30–60 mΩ R_DS(on)), bootstrapped high-side gate drive (VHI/VDRV), and a precision 1.26 V bandgap reference with ±50 ppm/°C tempco. The device features internal soft start, overvoltage protection (±10% window), under-voltage lockout (4.0–4.35 V startup), and junction temperature monitoring via VTJ pin with linear 1.2 V offset and –0.00384 V/°C slope.

Key Specifications

Pinout & Package

EL7564CREZ-T7 uses a 28-pin HTSSOP package with exposed thermal pad (MDP0048), requiring soldering of the pad to PCB copper for optimal thermal performance (θ_JA = 29°C/W typical).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down regulator applications.

Compared with ISL8024IRZ-T7 and TPS544B20RTWR, the EL7564CREZ-T7 uniquely combines junction temperature monitoring, analog power tracking, and 5 V–optimized efficiency in a mature, drop-in-replaceable HTSSOP package-making it ideal for legacy and thermally constrained embedded power designs.

Availability

EL7564CREZ-T7 is available at Aetrix Electronics and suitable for DSP core supplies, CPU I/O rails, FPGA auxiliary power, and multi-rail sequencing systems requiring stable component supply and long-term industrial availability.

Supply support for EL7564CREZ-T7 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) is a U.S.-based analog and power management semiconductor company founded in 1967, specializing in high-performance DC/DC converters, precision references, and interface ICs.

The EL7564 product line was designed for high-current, low-voltage point-of-load regulation in DSP, CPU, and FPGA applications-emphasizing integration, thermal robustness, and analog sequencing capability without digital overhead.

FAQ

What is the maximum continuous output current supported by the EL7564CREZ-T7?

The EL7564CREZ-T7 delivers 4 A continuous output current under specified thermal conditions (T_A ≤ 85°C, proper PCB heatsinking). This rating assumes use of the 28-pin HTSSOP package with the exposed thermal pad soldered to ≥1 in² of 1 oz. copper on both PCB layers, achieving θ_JA ≈ 29°C/W. At full load and 5 V input, peak efficiency reaches 95%, minimizing power loss and thermal rise in the EL7564CREZ-T7.

Does the EL7564CREZ-T7 support external synchronization of its switching frequency?

Yes, the EL7564CREZ-T7 supports external oscillator synchronization via its COSC pin. To ensure reliable locking, the free-running frequency must be set at least 20% lower than the external sync source using the COSC capacitor. The minimum sync pulse width is 25 ns, and the internal oscillator operates from 105 kHz to 130 kHz nominal before adjustment. This capability allows the EL7564CREZ-T7 to align switching edges with other converters to reduce beat frequencies and EMI in multi-rail systems.

How does the junction temperature monitoring function work on the EL7564CREZ-T7?

The EL7564CREZ-T7 provides junction temperature monitoring through the VTJ pin, which outputs a linear voltage: V_TJ = 1.2 V − 0.00384 × T_J, where T_J is junction temperature in °C. A 2.2–3.3 nF capacitor to SGND filters noise. Measuring VTJ allows real-time die temperature calculation without external sensors. The EL7564CREZ-T7 also includes hardware thermal shutdown at 135°C with 20°C hysteresis, ensuring protection even if monitoring is unused.

What are the key differences between the EL7564CREZ-T7 and the EL7564CM variants?

The EL7564CREZ-T7 uses a 28-pin HTSSOP package with exposed thermal pad (θ_JA ≈ 29°C/W), while EL7564CM uses 20-pin SOIC (θ_JA ≈ 43°C/W). Output initial accuracy differs: EL7564CREZ-T7 is 0.977–1.007 V at 0 A load vs. 0.960–0.990 V for EL7564CM. Both share identical functional blocks, but the CRE variant offers superior thermal performance and higher current capability in compact layouts-making EL7564CREZ-T7 preferred for high-density, thermally demanding applications.

Can the EL7564CREZ-T7 be used with input voltages outside the 4.5 V to 5.5 V range?

No-the EL7564CREZ-T7 is specified only for 4.5 V to 5.5 V input operation per Absolute Maximum Ratings and Electrical Specifications. Operation below 4.5 V may cause under-voltage lockout (V_{DD_ON} = 4.0–4.35 V), while exceeding 5.5 V risks damage (absolute max VIN = +6.5 V). For wider input ranges, alternatives like TPS544B20RTWR (4.5–18 V) should be evaluated. The EL7564CREZ-T7's architecture is optimized for 5 V intermediate bus systems, not universal input.