Renesas EL7563CREZ

Overview

EL7563CREZ from Intersil is a monolithic synchronous step-down DC/DC regulator delivering 4A continuous output current with adjustable 1.0V–2.5V output voltage, 95% peak efficiency, and constant-frequency PWM control. It integrates high- and low-side NMOS FETs, on-chip resistorless current sensing, junction temperature monitoring (VTJ), and power-good indication-designed for DSP/CPU core supplies in portable and desktop systems.

For engineers reviewing the EL7563CREZ datasheet, EL7563CREZ pinout, EL7563CREZ application, or EL7563CREZ equivalent, key selection considerations include its 28-pin HTSSOP package with thermal pad, 3V–3.6V input range, ±0.5% load/line regulation, internal soft-start, and auxiliary supply tracking for multi-rail sequencing.

Technical Context

The EL7563CREZ implements fixed-frequency current-mode PWM control with patented on-chip current sensing-eliminating external sense resistors while enabling cycle-by-cycle current limiting and fast transient response. Its oscillator supports external synchronization and adjustable frequency up to 1MHz via COSC capacitor.

Power tracking via STP/STN pins enables precise start-up sequencing of multiple converters; the VTJ pin provides a linear voltage output (1.2V – 0.00384×TJ) for real-time die temperature monitoring without external sensors. Over-temperature shutdown triggers at 135°C with 20°C hysteresis.

Key Specifications

Pinout & Package

EL7563CREZ is housed in a 28-pin HTSSOP package with exposed thermal pad (MDP0048), requiring PCB soldering of the pad for optimal thermal performance. Pin functions are validated per FN7296 Rev 2.00 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL85415EVAL1Z and TPS544B20RHLT, the EL7563CREZ delivers superior thermal performance (29°C/W) and tighter input voltage optimization (3.0–3.6V) for battery-powered 3.3V systems, while avoiding unnecessary digital overhead or wide-input design compromises.

Availability

EL7563CREZ is available at Aetrix Electronics and suitable for DSP core supplies, portable equipment power rails, and DC/DC converter modules requiring stable component supply, RoHS-compliant packaging, and proven thermal management in HTSSOP format.

Supply support for EL7563CREZ 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, with emphasis on efficiency, integration, and reliability for computing and communications markets.

The EL7563CREZ belongs to Intersil's monolithic synchronous buck regulator product line, engineered specifically for low-voltage, high-current core and I/O supplies in portable and desktop platforms where thermal density and sequencing precision are critical.

FAQ

What is the maximum recommended input voltage for EL7563CREZ?

The absolute maximum input voltage for EL7563CREZ is +4.5V, but the device is specified and optimized for operation between 3.0V and 3.6V. Operating above 3.6V degrades efficiency and increases thermal stress due to higher conduction losses in the integrated FETs. The datasheet explicitly defines performance curves and electrical specifications only within the 3.0–3.6V range, and EL7563CREZ is not rated for sustained use at 4.5V.

Does EL7563CREZ require an external current sense resistor?

No, EL7563CREZ does not require an external current sense resistor. It uses a patented on-chip resistorless current sensing technique that monitors inductor current through the high-side NMOS FET during conduction. This eliminates external components, reduces power loss, and maintains ±0.5% load regulation across 0.5A–4A output current-confirmed in the DC Electrical Specifications table of FN7296 Rev 2.00.

How is the output voltage set on EL7563CREZ?

The output voltage of EL7563CREZ is set using a resistor divider from VOUT to SGND connected to the FB pin. The internal reference is 0.992V (typical), so VOUT = 0.992V × (1 + R1/R2). For example, a 1.58kΩ (R1) and 1.0kΩ (R2) divider yields 2.5V. The FB pin has a 125nA internal pull-up current, which pulls VOUT to SGND if the divider is disconnected-providing fail-safe behavior confirmed on page 10 of FN7296.

What thermal management is required for EL7563CREZ in continuous 4A operation?

For continuous 4A operation, EL7563CREZ requires soldering of its exposed thermal pad to a minimum 1.0 in² copper area on a 2-layer PCB with 1 oz. copper on both sides. With this layout, θJA is 29°C/W (page 6, Figure 8), allowing operation up to 75°C ambient at full load. The VTJ pin must be used to verify actual die temperature, as thermal performance is highly dependent on PCB copper area and airflow-per Thermal Management section on page 14 of FN7296.

Can EL7563CREZ be synchronized to an external clock?

Yes, EL7563CREZ supports external oscillator synchronization via the 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 (e.g., 390pF for ~365kHz). Figure 22 on page 11 shows the recommended interface with BAT54S diode and 100pF AC-coupling capacitor-verified in the Oscillator section of FN7296 Rev 2.00.

What protection features are integrated into EL7563CREZ?

EL7563CREZ integrates over-current protection (cycle-by-cycle limiting at 5A peak), over-temperature shutdown (135°C trip, 20°C hysteresis), over-voltage protection (10% above target), under-voltage lockout (2.6V turn-on, 2.4V turn-off), and short-circuit protection. All are implemented in hardware without external components-documented in Features (page 1), Absolute Maximum Ratings (page 3), and Block Diagram (page 9) of FN7296 Rev 2.00.