Renesas ISL88732HRTZ

Overview

ISL88732HRTZ from Intersil is a SMBus Level 2 battery charger controller for Li-ion smart battery systems, supporting 1–4 series cells, 8A max charge current, 0.5% battery voltage accuracy, and boost-mode operation to supplement system load during adapter current limiting - used in notebook computers and tablet PCs.

For engineers reviewing the ISL88732HRTZ datasheet, ISL88732HRTZ pinout, ISL88732HRTZ application, or ISL88732HRTZ equivalent, key selection considerations include SMBus programmable charge/adapter current limits, turbo-boost discharge scaling (3.3×–9.31×), diode-emulated synchronous buck topology, and 5mm × 5mm 28-pin QFN package compatibility with ISL88731.

Technical Context

The ISL88732HRTZ implements a DC/DC synchronous-rectifier buck converter with diode emulation for light-load efficiency, and dynamically transitions into boost mode when system load exceeds adapter current limit - reducing charge current to zero and controlling LFET ON time to source supplemental power from the battery.

It supports SMBus 2-wire interface with 11-bit battery voltage setting, 6-bit charge/adapter current programming, and monitors adapter current (±3% accuracy), AC-adapter presence, and overcurrent via ALERT# with resistor-set threshold.

Key Specifications

Pinout & Package

ISL88732HRTZ is housed in a Pb-free, RoHS-compliant 5mm × 5mm 28-lead Thin QFN (TQFN) package with 0.5mm pitch and exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL88732HRTZ, ISL88731HRTZ offers identical footprint and interface but omits boost-mode intelligence, while BQ24725ARSMR provides TI-specific SMBus compatibility at reduced current capability and no native boost arbitration - making ISL88732HRTZ uniquely suited for adapter-throttled, high-current Turbo Mode platforms.

Availability

ISL88732HRTZ is available at Aetrix Electronics and suitable for notebook computers, tablet PCs, and smart battery systems requiring stable component supply, SMBus configurability, and adaptive boost-mode power management.

Supply support for ISL88732HRTZ 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 mixed-signal ICs for power management, precision analog, and interface applications.

The ISL88732HRTZ belongs to Intersil's smart battery charger controller product line, engineered specifically for SMBus-enabled portable computing platforms requiring dynamic adapter/battery power arbitration and Intel Turbo Mode support.

FAQ

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

The ISL88732HRTZ supports up to 8A maximum battery charge current. This rating is specified under recommended operating conditions with proper thermal management and external MOSFET selection. The actual delivered current depends on SMBus-programmed settings, CCLIM pin voltage, and thermal derating - all monitored and enforced by the ISL88732HRTZ's internal current-sense amplifiers and protection circuitry.

Does the ISL88732HRTZ support Intel Turbo Mode, and how?

Yes, the ISL88732HRTZ supports Intel Turbo Mode via its hardware-activated boost mode. When system load exceeds the programmed adapter current limit, the ISL88732HRTZ reduces charge current to zero and controls LFET ON time to draw supplemental power from the battery and boost it to adapter voltage - maintaining CPU/GPU performance without violating AC-adapter limits. Turbo-boost discharge scaling is configurable via SMBus command.

What package type and dimensions does the ISL88732HRTZ use?

The ISL88732HRTZ uses a Pb-free, RoHS-compliant 5mm × 5mm 28-lead Thin QFN (TQFN) package with 0.5mm pitch and an exposed thermal pad. This compact footprint matches ISL88731HRTZ and supports high-density layouts in space-constrained notebook and tablet PC designs. Thermal performance relies on proper PCB copper pour and solder paste stencil design for the thermal pad.

How accurate is the battery voltage regulation of the ISL88732HRTZ?

The ISL88732HRTZ provides ±0.5% end-of-charge battery voltage accuracy over temperature and line conditions. This precision is achieved through trimmed internal references and low-drift sensing circuitry, enabling reliable constant-voltage (CV) phase termination and minimizing risk of overvoltage stress on Li-ion cells. The accuracy is validated per FN7946 Rev.0.00 test data and applies to all 1–4 cell configurations.

Can the ISL88732HRTZ operate without SMBus communication?

Yes, the ISL88732HRTZ can operate without active SMBus communication using default factory-programmed values for charge voltage, current, and adapter limits - though full functionality (e.g., boost mode activation, telemetry readback, and dynamic reconfiguration) requires SMBus interface. Analog inputs like CCLIM allow partial configuration without SMBus, but features such as turbo-boost scaling and ALERT# threshold adjustment depend on SMBus commands.