Renesas ISL6442IA-TK

Overview

ISL6442IA-TK from Renesas Electronics (formerly Intersil) is a triple-output power controller integrating two 180° out-of-phase voltage-mode PWM buck controllers and one linear controller for broadband, DSL, and networking point-of-load regulation. It delivers ±1.5% reference accuracy, programmable 300kHz–2.5MHz switching frequency, 0.6V reference voltage, and hiccup-mode overcurrent protection. Used in DSL modems and FPGA/ASIC supply rails.

For engineers reviewing the ISL6442IA-TK datasheet, ISL6442IA-TK pinout, ISL6442IA-TK application, or ISL6442IA-TK equivalent, key selection criteria include dual-phase ripple reduction, lossless rDS(ON)-based current sensing, independent soft-start with voltage tracking, pre-biased soft-start capability, and integrated PGOOD with 370ms delay at 1.4MHz.

Technical Context

The ISL6442IA-TK implements synchronous buck control using voltage-mode architecture with dedicated error amplifiers (88dB DC gain, 15MHz GBWP) and programmable oscillator via RT resistor. Its 180° phase shift between PWM1 and PWM2 reduces input RMS current and input capacitor stress.

Each PWM channel features lossless overcurrent detection via upper MOSFET rDS(ON), adjustable OCSET threshold (80–140µA), and hiccup-mode fault response. The linear controller uses external PNP pass transistor driven by LCDR, regulated via LCFB feedback with 0.595V nominal threshold and ±25mV variation over –40°C to +85°C.

Key Specifications

Pinout & Package

ISL6442IA-TK is housed in a 24-lead QSOP package (M24.15 drawing), RoHS-compliant and Pb-free, with θJA = 85°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-output power controller applications.

Compared with ISL6442IA-TK, ISL6443IAZ-TK offers enhanced control loop flexibility at the cost of increased complexity, while TPS51220ARGER provides higher integration for dual-phase-only designs but omits the linear regulator entirely - making ISL6442IA-TK uniquely suited for mixed-mode (PWM + linear) broadband applications.

Availability

ISL6442IA-TK is available at Aetrix Electronics and suitable for DSL modems, FPGA point-of-load regulation, and broadband networking equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL6442IA-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

Renesas Electronics acquired Intersil in 2017 and maintains full technical and supply chain continuity for legacy Intersil power management ICs.

The ISL6442IA-TK belongs to Intersil's high-density multi-rail controller product line, designed specifically for space-constrained broadband infrastructure requiring integrated sequencing, protection, and low-noise regulation.

FAQ

What is the maximum supported switching frequency for ISL6442IA-TK?

The ISL6442IA-TK supports a programmable switching frequency range from 300kHz to 2.5MHz, set by an external resistor connected from the RT pin to SGND. At 5.23kΩ, the typical frequency is 2.5MHz with VIN = 12V. Operation above 2.5MHz is not specified or guaranteed, and high-frequency/high-VIN combinations increase on-chip power dissipation, particularly in the internal VCC regulator.

Does ISL6442IA-TK support soft-start into a pre-biased output?

Yes, ISL6442IA-TK supports monotonic soft-start into pre-biased loads. When the SS/EN ramp voltage is below the output voltage, the low-side MOSFET remains disabled until the ramp exceeds the output level, preventing reverse inductor current and ensuring seamless ramp-up. This behavior is confirmed in Figure 8 of the FN9204 datasheet and applies independently to each PWM output.

How does the overcurrent protection work on ISL6442IA-TK?

ISL6442IA-TK implements lossless overcurrent protection by monitoring the voltage drop across the upper MOSFET's rDS(ON) during its on-time. An internal 110µA current source pulls down the OCSET pin to establish a threshold; if the PHASE node voltage falls below OCSET while the upper FET is on, a cycle-by-cycle pulse termination occurs. After 32 consecutive faults, it enters hiccup mode - discharging the SS/EN capacitor and restarting soft-start.

Can ISL6442IA-TK generate three independent output voltages?

Yes, ISL6442IA-TK can generate three independent output voltages: two from its synchronous buck PWM controllers (VOUT1, VOUT2) and one from its linear controller (VOUT3). Each has separate feedback (FB1/FB2/LCFB), enable/soft-start (SS1/EN1, SS2/EN2), and protection circuits. The linear output requires an external PNP transistor driven by LCDR and is limited to ~1V–4V, with VIN3 ≤ VCC.

What is the purpose of the SGND and PGND pins on ISL6442IA-TK?

SGND is the signal ground reference for analog circuitry including feedback comparators, error amplifiers, and reference generation. PGND is the power ground return for high-current paths - specifically the lower gate drivers and external input capacitors. They must be routed separately on PCB to prevent noise coupling; SGND-to-PGND voltage difference is specified to stay within ±0.3V to maintain accuracy and stability of the ISL6442IA-TK control loops.