Renesas ISL97645IRZ-T

Overview

ISL97645IRZ-T from Renesas (formerly Intersil) is a highly integrated TFT-LCD power management IC for monitor and notebook displays up to 20", combining a 2.6A boost converter (7–20V AVDD), programmable VON slice circuit (up to 30V gate control), high-speed VCOM amplifier (30MHz BW, 50V/µs slew rate, 400mA peak), and supply-monitor-generated RESET signal. It operates from 2.7V–5.5V input and supports dual switching frequencies (600kHz/1.2MHz).

For engineers reviewing the ISL97645IRZ-T datasheet, ISL97645IRZ-T pinout, ISL97645IRZ-T application in LCD bias generation, or ISL97645IRZ-T equivalent for TFT display power solutions, this page delivers verified functional identity, validated pin roles, confirmed thermal and protection behavior, and real-world design constraints including soft-start timing, VGH_M slew control, and VCOM drive capability under capacitive load.

Technical Context

The ISL97645IRZ-T implements a current-mode PWM boost regulator with user-selectable 600kHz or 1.2MHz operation, internal 2.6A MOSFET, and soft-start via external SS capacitor (2.75µA charge current). Its VON slice uses digital-controlled three-state multiplexing (GND/VDD1/VGH) with CE/RE-programmable delay and slew, while the VCOM amplifier features rail-to-rail output swing, ±6V differential input range, and 70dB CMRR.

The supply monitor generates an open-drain RESET with rising-edge delay set by CD2 (10µA charge source, 121.5k·CD2), triggered when VDIV falls below 1.05V (falling) or rises above 1.18V (rising). UVLO activates at 2.35V (rising) and deactivates at 2.2V (falling), and thermal shutdown engages at 140°C with hysteresis down to 100°C.

Key Specifications

Pinout & Package

ISL97645IRZ-T is housed in a 24-lead 4×4 mm QFN package (Pb-free, RoHS-compliant) with exposed thermal pad. Pin 1 is marked by index area; package drawing L24.4x4D specifies 0.4mm pitch, 0.23mm terminal width, and 0.05mm max coplanarity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL97645IRZ-T, ISL97646AIRZ-T adds VGL generation at the cost of larger footprint and higher pin count, while TPS65150RGER sacrifices VON programmability for tighter integration and fixed-frequency simplicity-making ISL97645IRZ-T optimal for mid-size panels requiring precision gate pulse tuning without VGL.

Availability

ISL97645IRZ-T is available at Aetrix Electronics and suitable for LCD monitor power supplies, notebook display bias systems, and industrial HMI panel designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL97645IRZ-T 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

Renesas Electronics (acquired Intersil in 2017) is a global semiconductor leader specializing in microcontrollers, analog, power management, and timing solutions for automotive, industrial, and consumer markets.

The ISL97645IRZ-T belongs to Renesas' legacy TFT-LCD power management portfolio, designed specifically to consolidate AVDD, VCOM, and gate timing functions into a single IC for cost- and space-constrained display applications.

FAQ

What is the maximum VGH voltage supported by the ISL97645IRZ-T VON slice?

The ISL97645IRZ-T VON slice supports VGH input up to 30V, with absolute maximum rating of +32V relative to GND, AGND, or PGND. This allows direct interface with high-voltage gate drivers used in larger-format TFT panels. The VGH_M output follows VGH when enabled and RESET is low, making ISL97645IRZ-T suitable for panels requiring >25V gate drive.

How does the ISL97645IRZ-T generate the RESET signal, and what determines its timing?

The ISL97645IRZ-T generates RESET using an internal supply monitor that compares VDIV voltage against 1.05V (falling) and 1.18V (rising) thresholds. A capacitor on CD2 sets the rising-edge delay via 10µA charging (t_delay = 121.5k·C_D2). When VDIV drops below 1.05V, RESET asserts immediately with 750Ω pull-down; ISL97645IRZ-T thus provides configurable, noise-immune system reset timing.

Can the ISL97645IRZ-T drive large VCOM capacitance, and what limits its output current?

Yes, the ISL97645IRZ-T VCOM amplifier delivers 400mA peak and 100mA continuous output current, with 30MHz bandwidth and 50V/µs slew rate-enabling stable drive of >1µF panel capacitance. Output current is internally limited to protect reliability; sustained >400mA causes thermal shutdown at 140°C. ISL97645IRZ-T's VCOM section is optimized for reactive LCD loads, not resistive DC sinks.

What are the key layout requirements for the ISL97645IRZ-T boost converter section?

Key layout requirements for the ISL97645IRZ-T boost section include: (1) placing input/output capacitors and inductor within 3mm of pins VIN2, LX, PGND, and FB; (2) minimizing high-di/dt loop area (VIN2→LX→diode→COUT→PGND); (3) connecting PGND and AGND at a single point near the exposed thermal pad; (4) routing FB away from LX to avoid noise coupling; and (5) soldering the thermal pad to ≥200mm² copper with ≥6 vias for thermal management. These ensure >90% efficiency and stable regulation.

Does the ISL97645IRZ-T support both 600kHz and 1.2MHz switching frequencies, and how is selection implemented?

Yes, the ISL97645IRZ-T supports both 600kHz and 1.2MHz switching frequencies. Selection is implemented via the FREQ pin: connecting FREQ to GND selects 600kHz (typical 650kHz), while connecting FREQ to VIN2 selects 1.2MHz (typical 1.2MHz). This allows trade-offs between efficiency (lower fSW) and component size (higher fSW), with ISL97645IRZ-T maintaining >92% peak efficiency in both modes.