Renesas EL7642ILTZ-T13

Overview

EL7642ILTZ-T13 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 (VON/VOFF), a VON-slice circuit with adjustable delay, and five rail-to-rail operational amplifiers for VCOM/VGAMMA generation. It delivers ±75mA continuous output per amplifier, 12MHz bandwidth, and 12V/µs slew rate, targeting high-resolution LCD panel bias supply in notebooks and LCD-TVs.

For engineers reviewing the EL7642ILTZ-T13 datasheet, EL7642ILTZ-T13 pinout, EL7642ILTZ-T13 application, or EL7642ILTZ-T13 equivalent, key selection criteria include its 5-channel amplifier count, integrated sequencing control, 32-pin 5×5mm QFN package, -40°C to +85°C operation, and compatibility with external charge-pump topologies for >36V VON or <-25V VOFF rails.

Technical Context

The EL7642ILTZ-T13 implements a fixed-frequency (1050–1350kHz) current-mode PWM boost controller with internal 18V N-channel MOSFET and selectable P-mode (fast transient response) or PI-mode (tight regulation) compensation. Its five independent op-amps feature rail-to-rail I/O, 150mA short-circuit current capability, and are optimized for gamma correction and common-voltage buffering in active-matrix LCDs.

Two dedicated LDO controllers manage external PNP/NPN pass transistors for VON (+15V to +36V) and VOFF (–5V to –25V), each with fault detection (VFBP trip at 0.9V, VFBN trip at 430mV), soft-start (2ms), and sequencing delays (tDEL1–tDEL3 up to 17ms). Power-up is controlled via a programmable delay capacitor (CDEL = 50–220nF) on pin DEL.

Key Specifications

Pinout & Package

EL7642ILTZ-T13 is housed in a 32-lead Pb-free thin QFN package (5mm × 5mm, MDP0051), with exposed thermal pad for enhanced thermal performance. Pin functions are fully defined per datasheet FN7415 Rev 2.00.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL97645A and TPS65150RGER, EL7642ILTZ-T13 uniquely offers five integrated gamma amplifiers plus VON-slice logic in a single 5×5mm QFN-making it the only option for legacy or high-channel-count LCD panels requiring hardware-programmable VON timing without external logic.

Availability

EL7642ILTZ-T13 is available at Aetrix Electronics and suitable for TFT-LCD panel manufacturing, notebook OEM production, and industrial LCD-TV design requiring stable component supply and long-term lifecycle support.

Supply support for EL7642ILTZ-T13 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 EL764x family was designed specifically for TFT-LCD panel power systems, integrating boost conversion, LDO control, and gamma/VCOM amplification to replace multi-chip solutions in notebook, monitor, and TV applications.

FAQ

What is the maximum number of gamma voltage channels supported by EL7642ILTZ-T13?

The EL7642ILTZ-T13 integrates five independent operational amplifiers (OUT1–OUT5), each with rail-to-rail I/O and 150mA short-circuit current capability. This allows direct driving of five distinct VGAMMA voltage levels in high-resolution TFT-LCD panels. The EL7642ILTZ-T13 is the only variant in the EL764x family with five amplifiers-EL7641 has three, and EL7640 has one.

Does EL7642ILTZ-T13 support VON voltages above +36V?

Yes, EL7642ILTZ-T13 supports VON voltages above +36V using an external cascode NPN transistor between DRVP and the base of the PNP pass transistor, as shown in Figure 21 of FN7415 Rev 2.00. This configuration shifts the high-voltage stress away from the internal LDO controller while maintaining regulation accuracy and fault protection.

How does the VON-slice function operate in EL7642ILTZ-T13?

The VON-slice function in EL7642ILTZ-T13 uses pins CTL, COM, SRC, and DRN to implement a programmable level-shifter. When CTL is high, COM connects to SRC through a 15Ω resistor; when CTL is low, COM connects to DRN through a 30Ω resistor. This enables precise timing control of auxiliary VON-related signals in legacy LCD timing architectures.

What is the recommended delay capacitor value for standard power sequencing in EL7642ILTZ-T13?

The datasheet specifies CDEL = 220nF for standard sequencing timing (tDEL1 = 10ms, tDEL2 = 17ms, tDEL3 = 10ms). This value is used in Figures 23 and 13 of FN7415 Rev 2.00 and ensures correct startup order: VBOOST → VOFF → VON → VON-slice activation. Values between 50nF and 220nF are allowed, but 220nF delivers nominal timing per specification.

Can EL7642ILTZ-T13 operate in both P-mode and PI-mode for boost regulation?

Yes, EL7642ILTZ-T13 supports both modes: connecting COMP directly to VIN enables P-mode for superior transient response, while adding a 2.2nF capacitor and 180Ω resistor from COMP to ground configures PI-mode for tighter output regulation. Mode selection is hardware-configurable and does not require firmware or external control signals.