Renesas EL7530IYZ

Overview

EL7530IYZ 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 (0.8V–VIN) for Li-Ion, 3.3V, or 5V rail conversion in space-constrained portable systems. It features automatic PFM/PWM mode switching, 1.4MHz nominal PWM frequency, and 120µA no-load quiescent current.

For engineers reviewing the EL7530IYZ datasheet, EL7530IYZ pinout, EL7530IYZ application, or EL7530IYZ equivalent, key selection criteria include its MSOP-10 footprint (<0.18in²), Power-Good open-drain output, <1µA shutdown current, 95% peak efficiency, and external synchronization capability up to 12MHz for EMI-sensitive designs.

Technical Context

The EL7530IYZ implements a voltage-mode synchronous buck controller with fixed internal compensation, supporting both auto PFM/PWM transition and forced PWM operation via the SYNC pin. Its dual-MOSFET power stage integrates a 70mΩ PMOS and 45mΩ NMOS (wafer-tested), enabling continuous conduction mode above ~150mA and discontinuous operation at light loads.

It delivers regulated output through an external resistor divider on FB/VO pins, with feedback reference trimmed to 800mV ±10mV. Protection includes cycle-by-cycle current limiting (1.2A), thermal shutdown at 145°C with 15°C hysteresis, and short-circuit foldback - all implemented without external components.

Key Specifications

Pinout & Package

EL7530IYZ is housed in a Pb-free, RoHS-compliant 10-lead MSOP package (MDP0043), measuring 3.0mm × 4.9mm × 1.1mm max height, rated for -40°C to +85°C ambient operation. The fused-lead construction provides improved thermal resistance (θJA = 115°C/W on high-conductivity board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with EL7530IYZ, ISL9106 offers lower I_Q but sacrifices output current, protection features, and system-level signaling; TPS62231DRYT matches pinout and current capability but trades PFM efficiency for tighter frequency stability and TI's long-term supply assurance.

Availability

EL7530IYZ is available at Aetrix Electronics and suitable for portable medical sensors, barcode scanners, SFP modules, and Li-Ion powered PDAs requiring stable component supply with RoHS compliance and extended temperature support.

Supply support for EL7530IYZ 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 amplifiers, and interface ICs.

The EL7530 product line was designed specifically for space- and power-constrained portable electronics, emphasizing minimal external component count, ultra-low quiescent current, and robust protection in a thermally enhanced MSOP package.

FAQ

What is the maximum recommended output current for EL7530IYZ in continuous operation?

The EL7530IYZ is rated for 600mA continuous output current under standard thermal conditions (-40°C to +85°C ambient, θJA = 115°C/W). Peak current capability reaches 800mA for short transients, but sustained operation above 600mA requires careful thermal design due to internal power dissipation limits. Derating is advised above 60°C ambient temperature.

Does EL7530IYZ support pre-biased output startup?

Yes, EL7530IYZ supports pre-biased output startup: when EN is asserted, the device begins in PFM mode regardless of existing output voltage, preventing reverse current flow into the output capacitor. This behavior is explicitly confirmed in the Applications Information section of the FN7434 datasheet and applies to all EL7530IYZ variants including the Pb-free EL7530IYZ.

What is the purpose of the phase-lead capacitor C4 in the EL7530IYZ application circuit?

The phase-lead capacitor C4 (typically 470pF–4700pF) compensates for control-loop instability during PFM-to-PWM transitions by introducing a zero and pole in the transfer function. As specified in the Component Selection section of FN7434, C4 improves phase margin to suppress output voltage perturbation during mode switching - a documented requirement for stable EL7530IYZ operation across load steps.

Can EL7530IYZ be synchronized to a 10MHz external clock?

Yes, EL7530IYZ supports external synchronization from 1.6MHz up to 12MHz, inclusive of 10MHz. The SYNC pin accepts TTL/CMOS-compatible clock signals; Figure 14 and Figure 15 in FN7434 confirm stable operation at 2MHz and 12MHz, and the Electrical Specifications table lists "up to 12MHz" as the absolute maximum, confirming 10MHz is fully supported for EMI reduction.

How does the Power-Good (PG) output of EL7530IYZ behave during thermal shutdown?

During thermal shutdown, the EL7530IYZ disables both power MOSFETs and pulls the PG pin low via its internal open-drain NMOS, signaling loss of regulation. PG remains low until junction temperature falls below 130°C (15°C hysteresis), at which point the device restarts and PG returns high only after output voltage stabilizes within ±5% of the target - as defined by the VPG specification (95% rising / 86% falling of VFB).