Renesas ISL97642IRTZ-TK

Overview

ISL97642IRTZ-TK from Intersil is a TFT-LCD DC/DC power management IC integrating a current-mode boost regulator (18V/2.4A FET), two LDO controllers for VON and 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 ISL97642IRTZ-TK datasheet, ISL97642IRTZ-TK pinout, ISL97642IRTZ-TK application, or ISL97642IRTZ-TK equivalent, key selection criteria include its integrated 18V N-Channel MOSFET, ±75mA continuous op-amp output capability, -40°C to +85°C operating range, and 32-pin 5×5mm thin QFN package with thermal pad.

Technical Context

The ISL97642IRTZ-TK implements a fixed-frequency (1050–1350 kHz) current-mode PWM boost controller with internal 18V/2.4A N-Channel switch and 1% output voltage accuracy. Its dual LDO controllers regulate external PNP/NPN pass transistors for VON (+15V to +36V) and VOFF (–5V to –25V), each featuring fault trip comparators and soft-start.

All three operational amplifiers provide rail-to-rail I/O, 12V/µs slew rate, and 12MHz –3dB bandwidth-optimized for VCOM settling and VGAMMA voltage distribution in active-matrix LCDs. Power sequencing is hardware-controlled via the DEL capacitor and CTL input, enabling precise turn-on timing between VBOOST, VOFF, VON, and VON-slice activation.

Key Specifications

Pinout & Package

ISL97642IRTZ-TK is housed in a 32-lead thin QFN (5mm × 5mm × 0.75mm) package with an exposed thermal pad. The package is RoHS-compliant, Pb-free plus anneal, and rated for MSL3 per J-STD-020 at 260°C peak reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL97642IRTZ-TK, ISL97641IRTZ-TK reduces integration by removing one op-amp but retains full sequencing and LDO control, while TPS65105RGER shifts amplifier responsibility externally and replaces LDO controllers with gate drivers-requiring redesign of VON/VOFF stages and loss of VON-slice timing flexibility.

Availability

ISL97642IRTZ-TK is available at Aetrix Electronics and suitable for TFT-LCD panel manufacturing, notebook display subsystems, and industrial LCD monitor production requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL97642IRTZ-TK 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) is a U.S.-based analog and power management IC designer known for high-performance solutions in display, industrial, and communications markets.

The ISL97642IRTZ-TK belongs to Intersil's TFT-LCD power management product line, engineered specifically to consolidate boost conversion, dual-polarity LDO control, and high-speed bias amplification into a single chip for cost-sensitive, space-constrained LCD panels.

FAQ

What is the maximum output voltage achievable with the ISL97642IRTZ-TK's VON LDO controller?

The ISL97642IRTZ-TK's VON LDO controller supports output voltages from +15V to +36V using external PNP pass transistors and diode-capacitor charge pumps driven from the LX node. The upper limit is constrained by external component ratings-not the IC itself-and typical designs achieve +20V to +30V with proper transistor selection and layout. ISL97642IRTZ-TK integrates dedicated fault comparators that trip if VON falls below 75% of its nominal value, ensuring robust panel protection.

Does the ISL97642IRTZ-TK support discontinuous conduction mode (DCM) operation?

Yes, the ISL97642IRTZ-TK operates in both continuous and discontinuous inductor current modes. Its current-mode PWM architecture automatically transitions to DCM at light loads, though continuous mode is recommended for stable VON/VOFF charge-pump operation. The boundary condition depends on input voltage, output voltage, inductance, and load current-as defined by Equation 15 in the datasheet. ISL97642IRTZ-TK's internal slope compensation is optimized for 3.3–10 µH inductors in CCM, and DCM may degrade VON/VOFF regulation if not mitigated by inductor selection.

How does the DEL pin control power sequencing in the ISL97642IRTZ-TK?

The DEL pin connects to an external capacitor (22–100 nF) that sets four fixed 10 ms delays: VBOOST-to-VOFF, VOFF-to-VON, VON-to-VON-slice enable, and internal soft-start timing. This hardware-based sequencing eliminates firmware dependency and ensures repeatable, glitch-free LCD panel startup. ISL97642IRTZ-TK uses the same capacitor for all timing functions-reducing component count versus solutions requiring multiple RC networks. The DEL capacitor also determines fault delay (23 ms) before shutdown latching.

Can the ISL97642IRTZ-TK's operational amplifiers drive capacitive loads directly?

Yes, the ISL97642IRTZ-TK's three rail-to-rail op-amps are specified for ±75mA continuous output and 150mA short-circuit current, enabling direct driving of typical LCD panel VCOM and VGAMMA node capacitances (up to ~100 nF). Stability is maintained up to 100 nF with appropriate series resistance (≤10 Ω) per the layout guidelines. ISL97642IRTZ-TK's 12 MHz bandwidth and 12 V/µs slew rate ensure <5 µs settling for 10 V steps into 50 nF, meeting timing requirements for fast-refresh displays.

What protection features are built into the ISL97642IRTZ-TK's boost regulator?

The ISL97642IRTZ-TK boost regulator includes cycle-by-cycle current limiting (2.4–3.3 A peak), thermal shutdown (140°C), undervoltage lockout (2.2–2.6 V), and FB fault detection (trip at 0.85–1.02 V). It also features internal soft-start (7 ms) and multiple overload protections including LX overcurrent, output overvoltage, and input UVLO. ISL97642IRTZ-TK's current-mode control inherently provides fast transient response and inherent current limiting-eliminating need for external current-sense resistors or protection ICs in most TFT-LCD applications.