Renesas ISL88732HRTZ-T

Overview

ISL88732HRTZ-T from Intersil is a SMBus Level 2 battery charger controller for smart battery systems, supporting 1–4 Li-ion series cells with up to 8A charge current, 0.5% battery voltage accuracy, and integrated boost mode for Intel Turbo Mode support in notebook and tablet platforms.

For engineers reviewing the ISL88732HRTZ-T datasheet, ISL88732HRTZ-T pinout, ISL88732HRTZ-T application, or ISL88732HRTZ-T equivalent, key selection criteria include SMBus-programmable charge/adapter current limits (±4% and ±3% accuracy), 8A max charging capability, 11A adapter current handling, +8V to +22V input range, and verified boost-mode discharge current scaling (3.3×–9.31× CCLIM).

Technical Context

The ISL88732HRTZ-T implements a synchronous-rectifier buck converter with diode emulation for high light-load efficiency and integrates MOSFET drivers plus bootstrap diode to minimize external components. It operates in four distinct modes-charge-only, input-current-limited, boost-assisted, and discharge-only-dynamically managed via real-time adapter current sensing and SMBus command arbitration.

Its dual-loop control architecture independently regulates battery voltage (CV) and charge current (CC) while enforcing adapter current limit (AC) via analog or SMBus DAC input at CCLIM. Boost mode activates when system load exceeds adapter current limit, reducing charge current to zero and modulating LFET ON time to source supplemental power from the battery.

Key Specifications

Pinout & Package

The ISL88732HRTZ-T is housed in a 5mm × 5mm, 0.8mm-thin 28-lead QFN package with exposed thermal pad (EP), optimized for high-power density and thermal performance in space-constrained notebook chargers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery charger controller applications.

Compared with ISL88732HRTZ-T, ISL88731HRTZ-T omits critical boost-mode circuitry and control logic, while BQ24725ARHBT offers narrower current range and fixed turbo-boost scaling-making ISL88732HRTZ-T uniquely suited for adaptive, high-current SBS designs demanding programmable power arbitration.

Availability

ISL88732HRTZ-T is available at Aetrix Electronics and suitable for notebook computers, tablet PCs, and smart battery systems requiring stable component supply, SMBus-level programmability, and integrated boost-mode power arbitration.

Supply support for ISL88732HRTZ-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

Intersil Corporation, now part of Renesas Electronics, designs high-performance analog and power management ICs for computing, industrial, and communications markets.

The ISL88732HRTZ-T belongs to Intersil's Smart Battery Charger Controller product line, engineered specifically for SMBus Level 2–compliant portable platforms needing adaptive charge control, adapter current limiting, and battery-assisted boost operation.

FAQ

What is the maximum battery charge current supported by the ISL88732HRTZ-T?

The ISL88732HRTZ-T supports a maximum battery charge current of 8A. This rating is specified under typical operating conditions with adequate thermal management and proper layout of the 5mm × 5mm QFN package. The device maintains ±3% accuracy across temperature and line variations, ensuring reliable fast-charging performance in multi-cell Li-ion configurations used in high-end notebooks and tablets. The ISL88732HRTZ-T achieves this using integrated MOSFET drivers and low-offset current sensing with 10mΩ shunts.

Does the ISL88732HRTZ-T support Intel Turbo Mode, and how is it implemented?

Yes, the ISL88732HRTZ-T explicitly supports Intel Turbo Mode through its integrated boost mode. When system load exceeds the adapter current limit, the ISL88732HRTZ-T reduces charge current to zero and controls the LFET ON time to boost power from the battery to the system rail. The ISL88732HRTZ-T allows programmable turbo-boost discharge current limits-3.3×, 4.85×, 6.37×, or 9.31× the configured CCLIM-via SMBus command, enabling precise adaptation to CPU burst demands.

What is the adapter voltage input range for the ISL88732HRTZ-T?

The ISL88732HRTZ-T accepts an adapter input voltage range of +8V to +22V DC. This wide range accommodates standard AC-DC adapters used in consumer notebooks and tablets, including 12V, 15V, 19V, and 20V supplies. Internal protection circuitry ensures safe operation across this span, and the device maintains ±4% adapter current limit accuracy regardless of input voltage variation. The ISL88732HRTZ-T uses VIN as both power input and overvoltage reference point for system-level fault detection.

How does the ISL88732HRTZ-T achieve 0.5% battery voltage accuracy?

The ISL88732HRTZ-T achieves ±0.5% battery voltage accuracy through a trimmed, low-drift internal voltage reference and precision resistor-divider feedback network routed to the VBAT pin. This accuracy is maintained across temperature (–10°C to +85°C) and load conditions, enabling reliable end-of-charge detection and cell balancing readiness in smart battery systems. The ISL88732HRTZ-T uses this specification to support 11-bit programmable battery voltage settings via SMBus, critical for SBS v1.1 compliance.

Is the ISL88732HRTZ-T pin-compatible with any other Intersil battery charger controllers?

Yes, the ISL88732HRTZ-T is pin-compatible with the ISL88731HRTZ-T. Both devices share identical 28-lead QFN footprints, power pin assignments (VIN, VBAT, GND, EP), and SMBus interface layout. However, the ISL88732HRTZ-T adds dedicated boost-mode control logic and LFET gate drive capability not present in the ISL88731HRTZ-T. Designers can migrate from ISL88731HRTZ-T to ISL88732HRTZ-T with only firmware updates-no PCB revision required.