ISL94203IRTZ-T

ISL94203IRTZ-T is a Renesas Intersil Li‑ion battery protection IC designed for multi-cell packs (typically 2–3S). It acts as the protection core, monitoring per‑cell voltages and pack current, and drives external MOSFETs to disconnect the pack during faults. Features include overcharge and overdischarge protection, overcurrent/short‑circuit protection, temperature monitoring via an NTC input, fault latches, and status outputs for a microcontroller. It is not a charger; it protects the cell stack and interfaces with protection FETs. The IRTZ‑T suffix denotes a specific product variant and packaging (industrial temperature range, tape‑and‑reel). For exact electrical parameters, pinout, and wiring guidelines, consult the ISL94203 datasheet and application notes.

Direct cross references to non-Intersil parts aren’t exact; ISL94203IRTZ-T is part of the ISL9420x Li‑ion battery monitor/protection family. Closest equivalents within the same family: ISL94201, ISL94202, ISL94204 (and other ISL9420x variants) with similar cell counts and protections. Third‑party substitutes (not pin‑compatible) include TI BQ76920/30/40 (cell-monitor/protection). Always verify datasheets for pinout, voltage/current specs, and package before substitution.

ISL94203IRTZ-T features (concise):
- Multi-cell Li‑ion battery monitor and protection IC (pack protection for safety).
- Monitors per-cell voltages and pack current; includes coulomb counting (fuel gauge).
- Temperature sensing for the pack.
- Digital control via I2C interface for configuration, status, and calibration.
- Programmable protection thresholds: under/over-voltage, over-current, short-circuit, and fault protection with latch/interrupt output.
- Cell balancing capability (with external FETs) to equalize cell voltages.
- Fault reporting with status pins and interrupt generation.
- Low quiescent current and configurable power modes for efficiency.
- Supports external FET-based charge/discharge control; integrates with standard BMS topology.
- 8-pin package options (IRTZ-T), RoHS-compliant; suitable for industrial temperature ranges.
Note: Always refer to the datasheet for exact cell count supported, balancing type, and recommended external components.

Pin count: 8 pins (8-pin package, ISL94203IRTZ-T).
Function: Li-ion battery protection IC with external MOSFET gate drive; monitors voltage, current, and temperature to protect against overcharge, overdischarge, overcurrent/short-circuit, and abnormal temps, for a single-cell (1S) pack.

- Manufacturer: Intersil (brand now part of Renesas Electronics Corporation).
- What kind of company: A semiconductor company specializing in analog, mixed-signal, and power-management ICs (Intersil was acquired by Renesas in 2017).

ISL94203IRTZ-T is a Li-ion/Li-polymer battery-pack protection and fuel-gauge IC (1–4S). It is used in:
- Portable devices and notebook battery packs
- Cordless tools and other rechargeable equipment
- UPS/backup power and small energy-storage systems
- Electric bikes/scooters and other micro‑EV packs
- OEM multi‑cell battery modules needing over/under voltage, overcurrent, short‑circuit protection plus fuel gauging.

8-pin SOIC (SOP-8) surface-mount package (RoHS-compliant).