Renesas EL7583IRZ

Overview

EL7583IRZ from Intersil is a 3-channel DC/DC converter IC designed for TFT-LCD panel power management, integrating a PWM boost regulator (5V–17V output, up to 470mA at 12V), a positive charge pump (VON: +8V to +40V, 60mA), and a negative charge pump (VOFF: –5V to –40V, 60mA). It operates from 2.7V–14V input, features adjustable switching frequency (200–1000 kHz), soft-start control, and over-temperature shutdown at 130°C.

For engineers reviewing the EL7583IRZ datasheet, EL7583IRZ pinout, EL7583IRZ application, or EL7583IRZ equivalent, this page delivers verified technical context, package mapping to HTSSOP-20, confirmed pin functions including LX (triple-drain FET output), ENBN/ENP enable logic, and real-world design values for VBOOST load regulation (±0.5%), efficiency (>90% at 12V/470mA), and thermal protection hysteresis (40°C).

Technical Context

The EL7583IRZ implements a constant-frequency PWM boost controller with integrated 1.75A peak-current N-channel MOSFET, where output voltage is set via external resistor divider on FBB (1.300V reference) and switching frequency tuned by ROSC (200–1000 kHz range). Its dual regulated charge pumps operate at half the boost frequency and use independent feedback loops-FBP (1.310V) for VON and FBN (±80mV) for VOFF-with DRVN/DRVP gate drivers supporting external diode-capacitor networks.

Start-up sequencing is controlled by ENBN (enables boost + VOFF) and ENP (enables VON), with soft-start governed by SS pin current (12µA) charging an external capacitor to limit inrush. Over-temperature protection disables all channels when die temperature exceeds 130°C, re-enabling only after cooling to 90°C (40°C hysteresis), ensuring safe operation under sustained high-load conditions in compact LCD modules.

Key Specifications

Pinout & Package

The EL7583IRZ is housed in a Pb-free 20-lead HTSSOP package (MDP0048), featuring an exposed thermal pad for enhanced heat dissipation in high-power LCD applications. Pin numbering follows standard top-view orientation with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail LCD power supply applications.

Compared with TPS65105RGER and MAX1674AESE+, the EL7583IRZ uniquely combines independent enable control, adjustable frequency/soft-start, and fully integrated triple-output regulation - enabling precise power sequencing, EMI tuning, and reduced external component count in space-critical TFT-LCD systems.

Availability

EL7583IRZ is available at Aetrix Electronics and suitable for TFT-LCD panel manufacturing, portable medical display integration, and industrial HMI development requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for EL7583IRZ 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 consumer applications with emphasis on reliability and signal integrity.

The EL7583IRZ belongs to Intersil's TFT-LCD power management product line, engineered specifically to replace discrete boost and charge pump solutions in thin, high-resolution display modules requiring tightly regulated dual-polarity gate driver supplies.

FAQ

What is the maximum continuous output current capability of the EL7583IRZ boost converter?

The EL7583IRZ boost converter delivers up to 470mA at 12V output (VIN = 3.3V) and 370mA at 15V output, limited by internal 1.75A peak FET current and thermal dissipation in the HTSSOP package. Actual current depends on input voltage, output voltage, inductance, and ambient temperature - Table 1 in the FN7335 datasheet provides calculated IOMAX values across common operating points. The EL7583IRZ must be thermally derated above 85°C ambient per Figure 19.

How does the EL7583IRZ implement independent power sequencing for VBOOST, VON, and VOFF rails?

The EL7583IRZ uses two dedicated enable inputs: ENBN (pin 18) activates both the boost converter and VOFF charge pump, while ENP (pin 19) independently enables the VON charge pump. This allows designers to assert ENBN first to establish VBOOST, then delay ENP using an RC network to start VON after VBOOST stabilizes - preventing latch-up in cascaded gate driver circuits. The EL7583IRZ datasheet Figure 15 shows this staged power-up waveform.

What are the key layout requirements for stable operation of the EL7583IRZ charge pump sections?

Stable EL7583IRZ charge pump operation requires placing FBP and FBN feedback resistors directly at the VON/VOFF output nodes - after the output capacitor and diode - to avoid switching noise injection. All low-side resistors must connect to VSSB, which itself ties to PGND at a single point near pins 15/16. DRVN and DRVP traces should be short and symmetric, with matched parasitic inductance; external diodes (e.g., BAT54S) must be placed adjacent to the respective driver pins. The EL7583IRZ PCB Layout Guidelines on page 13 specify these practices.

Can the EL7583IRZ generate VON and VOFF outputs beyond the standard ±40V range?

No - the EL7583IRZ's internal charge pump regulators are specified for VON up to +40V and VOFF down to –40V, as defined by absolute maximum ratings and feedback reference tolerances. While external multi-stage diode-capacitor networks can extend voltage swing, the EL7583IRZ's FBP (1.310V) and FBN (±80mV) comparators lose regulation accuracy outside their designed range, and VDDP/VDDN supply limits (5V–17V) constrain practical extension. Exceeding ±40V risks violating absolute maximum ratings on DRVN/DRVP pins.

What thermal protection behavior does the EL7583IRZ exhibit during over-temperature events?

The EL7583IRZ features thermal shutdown with 130°C trip point and 40°C hysteresis, disabling all three output channels (VBOOST, VON, VOFF) when die temperature exceeds 130°C. Recovery occurs only after junction temperature falls below 90°C, preventing rapid cycling. This behavior is implemented via an internal temperature sensor and is independent of input voltage or load - confirmed in the Electrical Specifications table on page 3 of the FN7335 datasheet. The EL7583IRZ remains latched off until thermal recovery is complete.