Renesas EL7641ILTZ

Overview

EL7641ILTZ 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 three rail-to-rail operational amplifiers for VCOM/VGAMMA biasing. It delivers 150mA peak amplifier output, 12MHz bandwidth, and 12V/µs slew rate in LCD panel power systems.

For engineers reviewing the EL7641ILTZ datasheet, EL7641ILTZ pinout, EL7641ILTZ application, or EL7641ILTZ equivalent, this page provides verified technical context, package mapping, amplifier performance metrics, sequencing timing parameters, and validated alternative options for TFT-LCD power design.

Technical Context

The EL7641ILTZ implements a fixed-frequency (1050–1350 kHz) current-mode PWM boost controller with integrated 18V N-channel MOSFET and selectable P-mode (fast transient) or PI-mode (tight regulation) operation. Its three op-amps feature rail-to-rail I/O, 12V/µs slew rate, and ±75mA continuous output per channel.

Two independent LDO controllers regulate VON (positive, up to +36V) and VOFF (negative, down to –25V) using external transistors, with built-in fault protection, soft-start (2 ms), and programmable sequencing delays (tDEL1 = 10 ms, tDEL2 = 17 ms, tDEL3 = 10 ms) via CDEL capacitor.

Key Specifications

Pinout & Package

EL7641ILTZ is housed in a 32-lead 5 mm × 5 mm thin QFN package with exposed thermal pad (MDP0051), RoHS-compliant Pb-free plus anneal finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with EL7641ILTZ, ISL97645A offers greater op-amp count and higher panel scalability but removes VON-slice timing control, while TPS65105 trades bandwidth and slew rate for lower system cost-making EL7641ILTZ optimal for mid-size, high-refresh-rate TFT-LCDs requiring precise sequencing and fast analog settling.

Availability

EL7641ILTZ is available at Aetrix Electronics and suitable for TFT-LCD monitors, notebook displays, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for EL7641ILTZ 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 high-performance analog and power management ICs for display, industrial, and communications markets.

The EL764x family was designed specifically for integrated TFT-LCD panel power solutions-combining boost conversion, programmable LDO regulation, and high-speed analog buffering in a single QFN package.

FAQ

What is the maximum output current capability of each op-amp in the EL7641ILTZ?

Each of the three op-amps in the EL7641ILTZ supports ±75 mA continuous output current and 150 mA short-circuit peak current. This is confirmed in the Absolute Maximum Ratings table (Page 3) and Electrical Specifications (Page 4), where "OUT1, OUT2, OUT3 Maximum Continuous Output Current" is specified as ±75 mA. The EL7641ILTZ op-amps are rated for rail-to-rail operation and deliver 12 V/µs slew rate, making them suitable for driving capacitive VGAMMA loads in high-resolution panels.

Does the EL7641ILTZ support both P-mode and PI-mode for the boost regulator?

Yes, the EL7641ILTZ supports both P-mode and PI-mode operation for its main boost regulator. As stated in the datasheet (Page 1), P-mode delivers superior transient response, while PI-mode provides tighter output regulation. Mode selection is implemented externally: connecting the COMP pin directly to VIN enables P-mode; using a 2.2 nF capacitor and 180 Ω resistor in series between COMP and ground configures PI-mode. This flexibility allows designers to optimize for either dynamic load handling or steady-state accuracy depending on the panel's power profile.

How is the VON/VOFF sequencing delay controlled on the EL7641ILTZ?

The VON/VOFF sequencing delay on the EL7641ILTZ is controlled by an external capacitor connected to the DEL pin. Per the Electrical Specifications (Page 5), CDEL values between 50 nF and 220 nF set the timing-e.g., with CDEL = 220 nF, tDEL1 (VBOOST-to-VOFF) is 10 ms, tDEL2 (VON-to-VOFF) is 17 ms, and tDEL3 (VON-to-VON-slice enable) is 10 ms. These delays are critical for preventing LCD panel latch-up and are verified in Figure 23 (Start-up Sequence) on Page 15 of the FN7415 datasheet.

What package type and thermal characteristics does the EL7641ILTZ use?

The EL7641ILTZ uses a 32-lead 5 mm × 5 mm thin QFN package (MDP0051) with exposed thermal pad and Pb-free plus anneal finish. Its thermal performance is characterized with two JEDEC test boards: θJA = 125°C/W on single-layer board (758 mW max power dissipation at +85°C ambient) and θJA = 35°C/W on high-conductivity board (2.857 W max). This dual rating reflects real-world PCB layout dependency and is documented in Figures 15 and 16 (Page 9) of the FN7415 datasheet.

Can the EL7641ILTZ generate VON voltages above +36V?

No, the EL7641ILTZ's VON output is limited to +36V maximum due to internal ESD clamp and DRVP pin voltage rating. As noted in Figure 21 and the Applications Information section (Page 13), for outputs exceeding +36V, an external cascode NPN transistor must be inserted between DRVP and the base of the external PNP pass transistor. This configuration isolates the EL7641ILTZ's DRVP pin from overvoltage stress while enabling higher VON rails-confirmed in the "High Charge Pump Output Voltage (>36V) Applications" subsection.