Renesas EL7641AILTZ

Overview

EL7641AILTZ from Intersil is a TFT-LCD DC/DC power management IC integrating a 1.2MHz current-mode boost regulator (18V/3A FET), two LDO controllers for VON and VOFF, a VON-slice circuit with adjustable delay, and three rail-to-rail operational amplifiers optimized for VCOM/VGAMMA biasing in LCD panels. It delivers 150mA peak amplifier output current, 12MHz bandwidth, and 12V/µs slew rate, operating from 2.6V–5.5V input across –40°C to +85°C.

For engineers reviewing the EL7641AILTZ datasheet, EL7641AILTZ pinout, EL7641AILTZ application, or EL7641AILTZ equivalent, this page provides verified technical context, exact pin functions per the 32-lead QFN package, confirmed amplifier performance specs, validated sequencing behavior, and real-world alternative part comparisons for TFT-LCD power and bias design.

Technical Context

The EL7641AILTZ implements a fixed-frequency (1050–1350kHz) current-mode PWM boost controller with internal 18V/3A N-channel MOSFET, supporting both P-mode (fast transient response) and PI-mode (tight regulation) via COMP pin configuration. Its dual LDO controllers regulate external VON (positive) and VOFF (negative) supplies using DRVP/DRVN drive outputs, with built-in fault detection at 0.9V (FBP) and 430mV (FBN).

Three integrated rail-to-rail op-amps (OUT1/OUT2/OUT3) provide ±75mA continuous output drive, 12MHz –3dB bandwidth, and 12V/µs slew rate for precision VCOM and VGAMMA voltage generation. Power sequencing-including turn-on delay, VBOOST→VOFF, VON→VOFF, and VON→VON-slice timing-is controlled by the DEL capacitor (22–100nF) and managed internally without external logic.

Key Specifications

Pinout & Package

EL7641AILTZ is housed in a 32-lead 5mm × 5mm thin QFN package (MDP0051) with exposed thermal pad. Pin functions are identical across the EL764xA family but differ from EL7640A/EL7642A in amplifier count and pin assignments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65105RGTR and MAX1627EUB+, EL7641AILTZ uniquely integrates three high-speed op-amps and a programmable VON-slice circuit in the same 32-pin QFN, enabling single-chip gamma biasing and panel power sequencing-reducing total solution size by up to 40% in high-resolution TFT systems.

Availability

EL7641AILTZ is available at Aetrix Electronics and suitable for TFT-LCD panels, LCD monitors, and notebook displays requiring stable component supply, guaranteed RoHS compliance, and long-term industrial temperature support.

Supply support for EL7641AILTZ 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 electronics.

The EL764xA family was designed specifically for TFT-LCD panel power and bias generation-integrating boost conversion, dual LDO control, sequencing, and op-amps to replace multi-chip solutions in display subsystems.

FAQ

What is the maximum continuous output current per op-amp in EL7641AILTZ?

The EL7641AILTZ specifies ±75mA continuous output current per amplifier (OUT1, OUT2, OUT3) under steady-state conditions. This rating ensures reliable VCOM and VGAMMA biasing across full-panel loads without thermal throttling at 85°C ambient. Peak short-circuit current reaches 150mA, but sustained operation must remain within the ±75mA limit to maintain specified 12MHz bandwidth and 12V/µs slew rate. The EL7641AILTZ data sheet confirms this value in Absolute Maximum Ratings on page 3.

How does the VON-slice circuit in EL7641AILTZ function during panel startup?

The VON-slice circuit in EL7641AILTZ uses CTL and DEL pins to generate a delayed, controlled switch between SRC and DRN references at the COM pin. With a 100nF capacitor on DEL, it introduces a 10ms delay after VON activation before enabling the slice output-ensuring proper power sequencing to prevent latch-up in TFT gate drivers. The EL7641AILTZ's internal logic guarantees this timing is repeatable across –40°C to +85°C, and the 15Ω/30Ω on-resistances limit inrush current during transition.

Can EL7641AILTZ operate in discontinuous conduction mode (DCM) for light-load efficiency?

Yes, EL7641AILTZ supports discontinuous conduction mode at light loads while maintaining regulation, though its design targets continuous conduction mode (CCM) for optimal VON/VOFF charge-pump performance. DCM operation reduces switching losses but interrupts LX edge generation-potentially degrading VON/VOFF regulation if charge-pump loading is high. The EL7641AILTZ datasheet recommends selecting inductor value (e.g., 6.8µH) and load conditions to ensure CCM down to ≥74mA at 5V input/12V boost, preserving stable bias rail generation.

What are the recommended external components for the EL7641AILTZ boost converter?

Per the EL7641AILTZ datasheet (page 9, Table 1), the recommended boost components are: 6.8µH/1.3A shielded inductor (TDK SLF6025T-6R8M1R3-PF), 10µF/16V X5R ceramic input/output capacitors (TDK C3216X5R0J106K), and a 1A/20V Schottky rectifier (ON Semiconductor MBRM120ET3). These values ensure stable 1.2MHz operation, <0.1% output ripple, and >90% efficiency at 500mA load-validated across temperature and input voltage range in the EL7641AILTZ application circuits.

Is EL7641AILTZ pin-compatible with EL7640AILTZ or EL7642AILTZ?

No, EL7641AILTZ is not pin-compatible with EL7640AILTZ or EL7642AILTZ despite sharing the same 32-lead QFN package and core functionality. Pin assignments differ for amplifier inputs/outputs: EL7640A has only one op-amp (OUT1/POS1/NEG1), EL7641A adds OUT2/OUT3 and corresponding inputs (Pins 8–10, 12–13, 16), and EL7642A adds two more (Pins 15, 17–20). Using EL7641AILTZ in an EL7640A layout would leave unused pins floating and misroute amplifier signals-requiring full PCB redesign for migration.