Renesas ISL28022FRZ

Overview

ISL28022FRZ from Renesas Electronics is a precision bidirectional digital power monitor IC for high-side and low-side current sensing with integrated 16-bit ∑∆ ADC, I²C/SMBus interface, 0V–60V common-mode input range, <0.3% voltage/current measurement error at +25°C, and operation across –40°C to +125°C - used in telecom DC/DC converters and automotive power distribution systems.

For engineers reviewing the ISL28022FRZ datasheet, ISL28022FRZ pinout, ISL28022FRZ application, or ISL28022FRZ equivalent, key selection criteria include shunt voltage LSB (10 µV), bus voltage step size (4 mV in BRNG=0), fault threshold configurability, high-speed I²C support (3.4 MHz), and QFN16 package thermal resistance (θ_JA = 52°C/W).

Technical Context

The ISL28022FRZ implements a third-order sigma-delta ADC with internal 1.2V bandgap reference and programmable PGA gain (/1 to /8), enabling precise differential shunt voltage and single-ended bus voltage measurements. Its analog front-end multiplexer alternates between VBUS and VSENSE inputs under digital control.

Measurement sequencing is governed by an on-chip state machine supporting seven operating modes (MODE 0–6), with conversion times ranging from 72 µs (fastest) to 70.41 ms (highest resolution). Fault detection includes overvoltage/undervoltage and overcurrent thresholds with interrupt output via the EXT_CLK/INT pin.

Key Specifications

Pinout & Package

ISL28022FRZ is housed in a RoHS-compliant 16-lead QFN package (3 mm × 3 mm, L16.3x3B) with exposed thermal pad connected to GND for enhanced heat dissipation (θ_JA = 52°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital power monitoring applications.

Compared with ISL28022FRZ, ISL28023 offers expanded functionality at higher integration cost, while INA226 provides basic telemetry at lower performance - ISL28022FRZ uniquely balances 60V range, <0.3% accuracy, and QFN16 compactness for space-constrained high-voltage monitoring.

Availability

ISL28022FRZ is available at Aetrix Electronics and suitable for telecom power distribution, automotive body control modules, and server rack PSU telemetry requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL28022FRZ 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 is a global semiconductor leader delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and datacenter markets.

The ISL28022FRZ belongs to Renesas' Digital Power Monitor (DPM) family, engineered specifically for high-accuracy, wide common-mode voltage current and voltage sensing in mission-critical power systems.

FAQ

What is the maximum common-mode voltage the ISL28022FRZ can measure?

The ISL28022FRZ supports a common-mode input voltage range of 0V to 60V on VINP and VINM pins, with absolute maximum rating of 63V. This enables direct high-side sensing on 48V telecom and 24V industrial rails without external level-shifting circuitry. The device maintains <0.3% measurement accuracy across this full range at +25°C, and ±1% over the full –40°C to +125°C operating temperature range.

Does the ISL28022FRZ support both high-side and low-side current sensing configurations?

Yes, the ISL28022FRZ supports both high-side and low-side current sensing via its fully differential VINP/VINM inputs and flexible architecture. It handles negative system voltages and operates with common-mode voltages down to 0V, making it suitable for ground-referenced shunts. The device's 60V common-mode range and bidirectional current capability allow seamless integration in either configuration without hardware modification.

What I²C speeds does the ISL28022FRZ support, and are level shifters required?

The ISL28022FRZ supports standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode-plus (3.4 MHz) I²C operation. Its SDA/SCL inputs accept logic levels from 0.3×VCC to VCC+0.3V, and the open-drain outputs require only a single pull-up resistor to VCC - no external level shifters are needed for 3.3V or 5V systems. Input hysteresis (0.05×VCC) enhances noise immunity in electrically noisy environments.

How does the ISL28022FRZ handle power calculations and fault detection?

The ISL28022FRZ performs real-time power calculation (V × I) internally and stores the result in a dedicated power register. It also provides configurable overvoltage, undervoltage, and overcurrent fault thresholds with interrupt assertion on the EXT_CLK/INT pin. Fault status is latched and readable via I²C registers, enabling autonomous protection in systems where host MCU response time is constrained.

What package type and thermal characteristics apply to the ISL28022FRZ?

The ISL28022FRZ uses a 16-lead QFN package (3 mm × 3 mm, L16.3x3B) with exposed thermal pad. Its thermal resistance is θ_JA = 52°C/W and θ_JC = 6.5°C/W (measured at EPAD center), enabling reliable operation at full specification up to +125°C ambient when properly mounted on a 4-layer PCB with ≥2 cm² copper pour connected to the EPAD.