Renesas EL7534IYZ-T13

Overview

EL7534IYZ-T13 from Intersil is a synchronous, integrated-FET 600mA step-down DC/DC regulator with internal compensation, operating from 2.5V to 5.5V input and delivering adjustable output from 0.8V to VIN. It features 1.5MHz PWM switching, <1µA shutdown current, 100ms open-drain POR output, and over-temperature/short-circuit protection in a 10-lead MSOP package.

For engineers reviewing the EL7534IYZ-T13 datasheet, EL7534IYZ-T13 pinout, EL7534IYZ-T13 application, or EL7534IYZ-T13 equivalent, key selection considerations include its internally compensated voltage-mode control, 70mΩ PMOS/45mΩ NMOS R_DS(ON), 94% peak efficiency at 600mA, -40°C to +85°C operation, and Pb-free MSOP10 footprint optimized for space-constrained Li-ion–powered portable devices.

Technical Context

The EL7534IYZ-T13 implements a fixed-frequency (1.4–1.75MHz) voltage-mode PWM controller with internal compensation, eliminating external loop components. Its synchronous dual-FET architecture-70mΩ PMOS high-side and 45mΩ NMOS low-side-enables 100% duty-cycle operation near VIN and eliminates boot capacitor requirements.

It integrates a bandgap reference, soft-start (650µs), POR with 100ms delay and reset-triggering via RSI, thermal shutdown at 145°C with 15°C hysteresis, and current limiting at 1.5A. The separate SGND and PGND pins enforce clean signal/power ground separation critical for stability and EMI performance.

Key Specifications

Pinout & Package

EL7534IYZ-T13 is housed in a Pb-free, RoHS-compliant 10-lead MSOP package (MDP0043), 3.0mm × 4.9mm × 1.1mm max height, with fused leads for improved thermal resistance (θ_JA = 115°C/W on 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRVR and RT8059NGSP, EL7534IYZ-T13 delivers full 600mA with integrated POR, RSI reset, and internal compensation - reducing component count, PCB area, and validation effort for space- and reliability-critical portable designs.

Availability

EL7534IYZ-T13 is available at Aetrix Electronics and suitable for PDA power management, barcode reader subsystems, cellular phone baseband supplies, portable test equipment, and SFP module point-of-load regulation requiring stable component supply across industrial temperature ranges.

Supply support for EL7534IYZ-T13 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 IC designer known for high-performance DC/DC regulators, precision amplifiers, and interface solutions.

The EL7534 product line was designed specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, low-noise, and highly integrated step-down conversion with minimal external components.

FAQ

What is the maximum output current supported by the EL7534IYZ-T13?

The EL7534IYZ-T13 supports 600mA continuous output current and is rated for 800mA peak current. Its current limit is set at 1.5A to handle transient surges without triggering thermal shutdown under normal operating conditions. The actual deliverable current depends on ambient temperature, PCB copper area, and input/output voltage differential - for example, at 5V_IN/1.8V_OUT, full 600mA is achievable within the -40°C to +85°C range with adequate thermal design.

Does the EL7534IYZ-T13 require external compensation components?

No, the EL7534IYZ-T13 features an internally compensated voltage-mode PWM controller, eliminating the need for external compensation capacitors or resistors. This simplifies design, reduces BOM cost, and improves layout robustness - especially critical in high-density portable applications. The fixed compensation is optimized for 10–22µF ceramic output capacitors and 1.5–2.2µH inductors, as specified in the datasheet.

How does the POR function work on the EL7534IYZ-T13?

The EL7534IYZ-T13 provides a 100ms open-drain Power-On-Reset (POR) output that goes low immediately upon power-up and remains low for 80–120ms after the output voltage reaches regulation. Asserting the active-HI RSI pin resets the POR timer, causing POR to go low again for the same duration. When unused, RSI must be grounded and the POR pull-up resistor omitted. With R4 installed, POR acts as a delayed Power-Good signal for system sequencing.

What is the purpose of separate SGND and PGND pins on the EL7534IYZ-T13?

The EL7534IYZ-T13 separates Signal Ground (SGND, Pin 1) and Power Ground (PGND, Pin 2) to prevent high di/dt switching noise from coupling into sensitive control circuitry. SGND serves as the reference for FB, EN, RSI, and internal error amplifier; PGND carries high-current return paths for VIN and LX. They must connect at a single point - ideally near the IC - to avoid ground loops while maintaining noise isolation critical for stability and low output ripple.

Can the EL7534IYZ-T13 operate with input voltage equal to the desired output voltage?

Yes, the EL7534IYZ-T13 supports 100% duty-cycle operation due to its PMOS high-side switch, enabling output voltages up to ~VIN – (I_O × (R_DS(ON)-PMOS + R_L)). For example, with 3.3V input and 600mA load, it can sustain ~3.1V output. As VIN drops near VO, the controller enters 100% duty mode - the upper PFET stays fully on, bypassing the inductor. Output ripple may increase slightly in this region, so verify stability with larger output capacitance if operating near VIN.