Renesas ISL9305IRTHWCNYZ-T

Overview

ISL9305IRTHWCNYZ-T from Renesas (formerly Intersil) is a dual-buck + dual-LDO mini-PMIC for single-cell Li-ion/Li-polymer battery systems. It integrates two 3MHz, 1.5A synchronous step-down converters (DCD1 = 1.2V, DCD2 = 1.8V) and two I²C-programmable LDOs (LDO1 = 3.3V, LDO2 = 0.9V), delivering precise multi-rail power to mobile SoCs and DSP cores.

For engineers reviewing the ISL9305IRTHWCNYZ-T datasheet, ISL9305IRTHWCNYZ-T pinout, ISL9305IRTHWCNYZ-T application, or ISL9305IRTHWCNYZ-T equivalent, key selection criteria include factory-fixed output voltages, 400kb/s I²C interface with on-the-fly slew rate control, skip-mode efficiency optimization, and thermal shutdown at 155°C in a 4mm×4mm TQFN package.

Technical Context

The ISL9305IRTHWCNYZ-T implements peak-current-mode PWM control for both buck converters, enabling fast transient response and pulse-by-pulse current limiting. Its 3MHz switching frequency supports compact 1.5µH inductors and low-ESR ceramic capacitors while maintaining stable regulation across 2.5–5.5V input range.

I²C registers enable independent configuration of DCD1/DCD2 forced-PWM/skip mode, active discharge (115Ω bleeding resistor), phase alignment, and programmable DCDPG delay (1–200ms). LDO1/LDO2 support 50mV-step I²C reprogramming within 0.9–3.6V, with dropout as low as 80mV at 300mA for high-efficiency linear regulation.

Key Specifications

Pinout & Package

ISL9305IRTHWCNYZ-T is housed in a 4mm × 4mm, 16-lead TQFN package with exposed thermal pad (Package Code: L16.4x4G). The E-pad must be soldered to PCB ground for optimal thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail PMIC applications.

Compared with TPS65023BRSBR and MAX8649ETE+, the ISL9305IRTHWCNYZ-T uniquely combines factory-set precision (1.2V/1.8V/3.3V/0.9V), full I²C control of all outputs, and programmable DCDPG timing - making it optimal for firmware-driven power architectures where rail agility and sequencing control are critical.

Availability

ISL9305IRTHWCNYZ-T is available at Aetrix Electronics and suitable for smartphone application processors, portable medical sensor hubs, wearable DSP audio subsystems, and other space-constrained, battery-powered electronics requiring stable component supply and long-term lifecycle support.

Supply support for ISL9305IRTHWCNYZ-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 Corporation is a global semiconductor leader delivering trusted embedded design innovation through high-performance analog, power, and microcontroller solutions.

The ISL9305H product line was designed specifically for ultra-compact, multi-rail power management in single-cell Li-ion mobile devices - emphasizing integration density, I²C configurability, and thermal robustness in 4mm×4mm packages.

FAQ

What are the factory-programmed output voltages of the ISL9305IRTHWCNYZ-T?

The ISL9305IRTHWCNYZ-T has four factory-fixed output voltages: DCD1 = 1.2V, DCD2 = 1.8V, LDO1 = 3.3V, and LDO2 = 0.9V. These values are laser-trimmed during manufacturing and cannot be altered by external resistors. However, all four outputs remain fully programmable via the 400kb/s I²C interface across their respective ranges (0.825–3.6V for bucks, 0.9–3.6V for LDOs) using 25mV or 50mV steps.

Does the ISL9305IRTHWCNYZ-T support forced PWM mode for its buck converters?

Yes, the ISL9305IRTHWCNYZ-T supports forced PWM mode for both DCD1 and DCD2 via I²C register control (DCD_PARAMETER register, Bits B0/B1). This disables automatic skip-mode entry under light load, ensuring constant 3MHz switching frequency - essential for noise-sensitive applications like audio or RF circuits where variable-frequency PFM operation could cause interference.

How is power-good monitoring implemented on the ISL9305IRTHWCNYZ-T?

The ISL9305IRTHWCNYZ-T uses the open-drain DCDPG pin (Pin 10) to indicate combined power-good status of DCD1 and DCD2. When both outputs are within ±9% of their nominal voltages, DCDPG releases to be pulled high after a user-programmable delay (1–200ms via SYS_PARAMETER register). If either output falls outside this window, DCDPG pulls low. The delay prevents false assertions during startup transients.

Can the ISL9305IRTHWCNYZ-T's LDO outputs be used independently of the buck converters?

Yes, the ISL9305IRTHWCNYZ-T allows independent enable/disable control of each regulator via I²C (SYS_PARAMETER register, Bits B0–B3). LDO1 and LDO2 can be powered from battery (VINLDO1/VINLDO2 = 1.5–5.5V) or from either DCD output - enabling flexible power sequencing, such as enabling LDO2 (0.9V) before DCD2 (1.8V) for RF subsystem initialization, without affecting other rails.

What thermal protection features does the ISL9305IRTHWCNYZ-T include?

The ISL9305IRTHWCNYZ-T incorporates thermal shutdown at +155°C with +30°C hysteresis. When junction temperature reaches 155°C, all regulators disable and the device enters thermal shutdown. Operation resumes only after die temperature drops to ~125°C, beginning with soft-start to prevent inrush current. This protects against sustained overload or poor PCB thermal design while maintaining reliability in sealed handheld enclosures.