Renesas EL7534IYZ

Overview

EL7534IYZ from Intersil is a synchronous, integrated-FET 600mA step-down DC/DC regulator in a Pb-free 10-lead MSOP package. It operates from 2.5V to 5.5V input, delivers adjustable output from 0.8V to VIN via external resistor divider, and features 1.5MHz PWM switching, internal compensation, and 100ms open-drain POR output - used in Li-ion–powered portable electronics requiring compact, high-efficiency power conversion.

For engineers reviewing the EL7534IYZ datasheet, EL7534IYZ pinout, EL7534IYZ application, or EL7534IYZ equivalent, key selection criteria include its 600mA continuous output, <1µA shutdown current, dual ground separation (PGND/SGND), thermal shutdown at 145°C, and compatibility with single-sided PCB layouts under 0.15 in² footprint.

Technical Context

The EL7534IYZ implements a voltage-mode PWM controller with fixed internal compensation, enabling stable operation using only two 10µF ceramic capacitors and a 1.8µH inductor. Its synchronous topology uses an integrated PMOS (70mΩ typical R_DS(ON)) and NMOS (45mΩ) switch pair, eliminating boot capacitor needs and supporting up to 100% duty cycle for near-input-output voltage operation.

It integrates functional blocks including soft-start (650µs), POR with 100ms delay referenced to V_FB, overcurrent protection (1.5A limit), and thermal shutdown with 15°C hysteresis (145°C trip / 130°C restart). The RSI pin provides asynchronous reset of POR timing without affecting regulation.

Key Specifications

Pinout & Package

EL7534IYZ is housed in a RoHS-compliant, Pb-free 10-lead MSOP package (MDP0043), 3.0mm × 4.9mm × 1.1mm profile, optimized for thermal performance on 2- or 4-layer boards (θ_JA = 125°C/W or 100°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRYR and RT8059GJ6, the EL7534IYZ provides unique integration of POR with RSI-triggered reset, dual-ground isolation, and internal compensation - reducing BOM count and layout complexity for portable systems requiring deterministic power sequencing.

Availability

EL7534IYZ is available at Aetrix Electronics and suitable for bar code readers, portable test equipment, SFP modules, cellular phones, and Li-ion–powered handheld devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for EL7534IYZ 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 EL7534IYZ belongs to Intersil's monolithic DC/DC regulator product line, engineered for space-constrained portable electronics needing high efficiency, low quiescent current, and integrated power-good signaling without external components.

FAQ

What is the maximum output current rating for the EL7534IYZ?

The EL7534IYZ is rated for 600mA continuous output current. Its current limit is set at 1.5A to handle transient overloads and short-circuit conditions. Derating is required above 85°C ambient per the thermal curves in the FN7431 datasheet, and allowable power dissipation depends on PCB copper area and layer count - e.g., 0.5W on a 4-layer board at 25°C ambient.

Does the EL7534IYZ require external compensation components?

No, the EL7534IYZ features an internally compensated voltage-mode PWM controller. This eliminates the need for external compensation networks and guarantees stability when using recommended 10–22µF ceramic input/output capacitors and a 1.5–2.2µH inductor - simplifying design and reducing BOM count.

How does the POR function work on the EL7534IYZ, and can it be disabled?

The EL7534IYZ generates a 100ms open-drain POR signal that stays low until the output reaches regulation, then remains low for 100ms before going high. It can be reset anytime via the active-HI RSI pin. To disable POR, leave the POR pin unconnected and tie RSI to ground - no pull-up resistor is needed unless POR is actively used as a power-good signal.

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

The EL7534IYZ separates signal ground (SGND, Pin 1) and power ground (PGND, Pin 2) to isolate noise-sensitive control circuitry from high-current switching paths. This prevents switching transients on PGND from modulating the feedback reference or oscillator, improving regulation accuracy and transient response - especially critical in noise-sensitive analog or RF subsystems.

Is the EL7534IYZ pin-compatible with other variants like EL7534IY or EL7534IYZ-T13?

Yes, the EL7534IYZ shares identical pinout, electrical specifications, and package (10-lead MSOP) with EL7534IY and EL7534IYZ-T13. The suffix differences indicate packaging (tape-and-reel vs. cut tape) and RoHS compliance (Pb-free anneal process), not functional or mechanical variation - making them direct replacements in existing designs.