Renesas EL7584IR

Overview

EL7584IR from Intersil is a 4-channel TFT-LCD power supply IC integrating a high-efficiency DC/DC boost converter (5V–17V @ 370mA), dual regulated charge pumps (VON: +5V to +40V, VOFF: –40V to 0V, each up to 60mA), and a VCOM buffer (2V–13V @ 50mA). It operates from 2V–14V input, features adjustable switching frequency (200–1200 kHz), built-in power-up sequencing, and over-temperature protection at 130°C.

For engineers reviewing the EL7584IR datasheet, EL7584IR pinout, EL7584IR application, or EL7584IR equivalent, this device is selected for TFT-LCD panel power management where precise, sequenced, multi-rail generation-especially VCOM, VON, and VOFF-is required with minimal external components and thermal robustness in compact portable displays.

Technical Context

The EL7584IR implements constant-frequency PWM control for its main boost converter, using an internal N-channel MOSFET with 0.22Ω R_DS(on) and 1.75A peak current limit. Its switching frequency is set externally via ROSC (62kΩ typical) and ranges from 200 kHz to 1.2 MHz, directly governing both the boost stage and the half-frequency charge pumps (VON/VOFF).

Power sequencing is fully integrated: EN activation triggers VBOOST and VOFF first, followed by VCOM when regulation thresholds are met, then VON after a programmable delay (default ~3.5 ms, extendable via DP pin capacitor). The VCOM buffer delivers ±50mA with <±10 mV offset accuracy and 0.25Ω output impedance, optimized for capacitive LCD backplane driving.

Key Specifications

Pinout & Package

EL7584IR is housed in a 24-pin TSSOP package (MDP0044), thermally rated at θ_JA = 85°C/W on high-conductivity PCBs. Pin functions are validated per FN7317 Rev 2.00 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TFT-LCD power management applications.

Compared with TPS65105RGER and MAX1627EAP+, the EL7584IR uniquely integrates all four essential TFT-LCD rails-including a 370mA boost converter-into one RoHS-compliant TSSOP, enabling complete panel power with minimal external components and guaranteed sequencing, whereas alternatives require supplemental regulators or lack key outputs.

Availability

EL7584IR is available at Aetrix Electronics and suitable for TFT-LCD panels, portable display modules, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for EL7584IR 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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and consumer applications.

The EL7584IR belongs to Intersil's TFT-LCD power management product line, designed specifically to consolidate multiple display bias rails into a single IC with hardware-enforced sequencing and thermal resilience for portable and rugged display systems.

FAQ

What is the maximum continuous output current of the EL7584IR's VBOOST channel?

The EL7584IR's VBOOST channel delivers up to 370mA continuously at 15V output when supplied from a 3.3V input and operating at 1 MHz switching frequency, as specified in the FN7317 datasheet under typical conditions. Absolute maximum continuous current is rated at 800mA, but sustained operation above 370mA requires careful thermal design due to power dissipation limits in the 24-pin TSSOP package.

How does the EL7584IR implement power-up sequencing between VBOOST, VOFF, VCOM, and VON?

The EL7584IR executes fixed hardware sequencing: upon EN assertion, VBOOST and VOFF activate first; once VBOOST reaches regulation (V(FBB) > 1.13V) and VOFF stabilizes, VCOM enables; finally, VON activates after a default ~3.5ms delay (extendable via DP pin capacitor). This eliminates need for external microcontrollers or timers - all timing and dependency checking is internal to the EL7584IR.

Can the EL7584IR generate VON and VOFF outputs higher than ±40V?

No - the EL7584IR's VON and VOFF outputs are limited to +5V to +40V and –40V to 0V respectively, as defined by its internal reference and feedback comparator architecture. While external diode-capacitor multiplier stages can extend voltage magnitude, the EL7584IR itself regulates only within those bounds and does not support >±40V output directly. Exceeding these ranges risks loss of regulation or damage to external components.

What is the role of the SS pin on the EL7584IR, and how is it used in circuit design?

The SS (Soft-Start) pin on the EL7584IR controls the ramp rate of the boost converter's current limit during startup by charging an external capacitor with a 12µA internal current source. This limits inrush current into large output capacitors and prevents overshoot. A typical 0.1µF capacitor yields controlled VBOOST rise time - critical for reliable startup into heavy capacitive loads common in TFT-LCD panels powered by the EL7584IR.

Does the EL7584IR support Pb-free assembly, and what is its RoHS status?

Yes - the EL7584IR is RoHS compliant and Pb-free, as confirmed in the "Ordering Information" table of FN7317 Rev 2.00. The EL7584IRZ variants explicitly denote Pb-free construction with 100% matte tin termination, but the base EL7584IR also meets RoHS Directive 2011/65/EU requirements and is compatible with both SnPb and Pb-free reflow profiles per IPC/JEDEC J-STD-020.