Renesas ISL6294IBZ-T

Overview

ISL6294IBZ-T from Renesas Electronics is a fully integrated high-input-voltage linear Li-ion battery charger IC for single-cell 4.2V batteries. It implements CC/CV charging with programmable 100–600mA charge current (SOIC package), 1% voltage regulation accuracy, thermal foldback at +115°C, and dual open-drain status pins (PPR/CHG) for adapter presence and charge completion indication in portable power systems.

For engineers reviewing the ISL6294IBZ-T datasheet, ISL6294IBZ-T pinout, ISL6294IBZ-T application, or ISL6294IBZ-T equivalent, this page delivers verified technical context, SOIC-8 package mapping, real-world charge profile behavior, thermal protection thresholds, and validated alternative parts for handheld Li-ion charging designs.

Technical Context

The ISL6294IBZ-T uses an internal P-channel MOSFET pass element with typical r_DS(ON) of 0.6Ω to deliver constant-current charging up to 600mA (SOIC), transitioning to constant-voltage regulation at 4.20V ±1%. Its input voltage operating range is 4.5V–6.5V, with 28V absolute maximum rating and 6.8V overvoltage protection threshold to safeguard against faulty adapters.

It integrates preconditioning (trickle charge at ~20% I_REF below 2.55V battery voltage), end-of-charge detection via IMIN-programmable current threshold (e.g., 45mA), and thermal foldback activation at +115°C die temperature-enabling safe operation without external thermal sensors or discrete protection circuitry.

Key Specifications

Pinout & Package

ISL6294IBZ-T is housed in an 8-lead narrow-body SOIC package (M8.15, 5.0mm × 4.0mm × 1.27mm height) with gull-wing leads and RoHS-compliant matte tin plating. The exposed pad is absent-thermal management relies on PCB copper area under the body and lead-frame conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-cell Li-ion linear charger applications.

Compared with ISL6294IBZ-T, TPS650230RSLR adds system power integration but increases complexity and cost for pure charging use cases, while BQ24075RGTR offers higher current but lacks built-in thermal foldback-requiring careful thermal layout validation.

Availability

ISL6294IBZ-T is available at Aetrix Electronics and suitable for mobile phones, Bluetooth headsets, MP3 players, and portable medical monitors requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for ISL6294IBZ-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 is a global semiconductor leader delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and IoT applications.

The ISL6294 belongs to Renesas' legacy Intersil analog power portfolio, designed specifically for cost-sensitive, space-constrained single-cell Li-ion charging in consumer portable electronics.

FAQ

What is the maximum charge current supported by the ISL6294IBZ-T in SOIC package?

The ISL6294IBZ-T supports a maximum programmable charge current of 600mA in the 8-lead SOIC package. This limit is thermally constrained by the package's θ_JA of 95°C/W. Exceeding 600mA risks thermal foldback activation or unreliable regulation. For higher currents, the DFN variant (ISL6294IRZ-T) supports up to 900mA due to its lower thermal resistance (θ_JA = 59°C/W). Always verify PCB copper area and ambient conditions per the thermal guidelines in FN9174 Rev 4.00.

Does the ISL6294IBZ-T require an external blocking diode?

No, the ISL6294IBZ-T does not require an external blocking diode. It integrates a P-channel MOSFET pass element and internal current-sense circuitry, enabling direct battery connection at the BAT pin. The architecture prevents reverse current flow from battery to input when VIN is removed, eliminating the voltage drop and power loss associated with discrete diodes. This integration reduces bill-of-materials count and improves efficiency in the ISL6294IBZ-T application.

How does the ISL6294IBZ-T indicate end-of-charge condition?

The ISL6294IBZ-T signals end-of-charge (EOC) using the open-drain CHG pin: it outputs a logic LOW during active charging and transitions to HIGH impedance (effectively HIGH when pulled up) when the charge current falls to the programmed IMIN threshold-typically 45mA with a 243kΩ resistor. This transition provides a clean, hardware-based EOC flag usable by microcontrollers or LEDs without software polling. The ISL6294IBZ-T datasheet confirms CHG remains HIGH after EOC unless charge current rises significantly (e.g., due to load transients).

What is the purpose of the PPR pin on the ISL6294IBZ-T?

The PPR (Power Presence) pin on the ISL6294IBZ-T is an open-drain output that indicates valid input power: it pulls LOW when VIN exceeds the POR threshold (~3.9V) and remains below the OVP threshold (~6.8V), regardless of EN pin state. It sinks ≥10mA, enabling direct LED drive or MCU GPIO monitoring. Unlike CHG, PPR operates independently of charging activity-making it ideal for system-level "adapter present" detection in the ISL6294IBZ-T application, even when the charger is disabled.

Can the ISL6294IBZ-T operate without a battery connected?

No, the ISL6294IBZ-T is not guaranteed to operate stably without a battery connected. The device relies on the battery capacitance (≥1µF X5R ceramic) at the BAT pin for loop stability and output regulation. Operation without a battery may cause oscillation, inaccurate voltage regulation, or undefined behavior-particularly during startup or transient events. The ISL6294IBZ-T datasheet explicitly states stability is only ensured with a battery present, and recommends verifying performance in final application conditions with actual cell impedance and ESR.