Renesas ISL6292-1CR3

Overview

ISL6292-1CR3 from Renesas Electronics is a single-cell Li-ion/Li-polymer linear battery charger IC with programmable 1.0A constant charge current (RIREF = 80kΩ), ±1% VCH regulation at 4.10V, thermal foldback protection, and NTC-based temperature monitoring. It operates from 4.3V–6.5V input, supports USB or wall adapter sources, and targets space-constrained portable devices requiring safe, low-thermal-dissipation charging.

For engineers reviewing the ISL6292-1CR3 datasheet, ISL6292-1CR3 pinout, ISL6292-1CR3 application, or ISL6292-1CR3 equivalent, key selection criteria include its 3×3 DFN package thermal performance (θJA = 46°C/W), 1.0A max charge current rating, 2.8V V2P8 reference output for adapter presence detection, and integrated trickle-to-CC/CV charge sequencing with automatic recharge.

Technical Context

The ISL6292-1CR3 implements a dual-mode linear charging architecture: it functions as a precision CC/CV regulator with external IREF resistor programming when powered by voltage-source adapters, and transitions to a quasi-switching mode under current-limited adapter conditions-leveraging internal MOSFETs in saturation to reduce rDS(ON)-dominated power loss instead of linear dissipation.

Its block-level control includes a 100,000:1 current mirror (QMAIN/QSEN), programmable oscillator-based TIMEOUT timer (22-stage counter), preconditioning logic that verifies VBAT ≥ 2.8V for 15 cycles before CC mode, and dual-threshold NTC interface (VTMIN = 1.51V, VTMAX = 0.38V at V2P8 = 3.0V) for battery temperature safety enforcement.

Key Specifications

Pinout & Package

ISL6292-1CR3 is housed in a RoHS-compliant, thermally enhanced 10-lead 3×3 mm DFN package (PKG DWG L10.3x3) with exposed thermal pad. The IMIN pin is internally connected to V2P8; TOEN is not bonded and must be left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL6292-1CR4Z-T and BQ24075RGTR, the ISL6292-1CR3 delivers optimal thermal performance in ultra-compact layouts (46°C/W θJA), deterministic 1.0A charging without layout-dependent current derating, and simplified NTC integration-making it ideal for cost-sensitive, space-constrained consumer and medical handhelds.

Availability

ISL6292-1CR3 is available at Aetrix Electronics and suitable for medical handheld devices, smartphones, USB-powered portable instruments, and self-charging battery packs requiring stable component supply across production lifecycles.

Supply support for ISL6292-1CR3 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 specializing in microcontrollers, analog power management, and timing solutions for automotive, industrial, and consumer markets.

The ISL6292 product line delivers highly integrated, thermally robust linear battery chargers targeting portable electronics where PCB area, thermal headroom, and safety certification are critical constraints.

FAQ

What is the maximum charge current supported by the ISL6292-1CR3?

The ISL6292-1CR3 supports a maximum constant charge current of 1.0A when programmed with an 80kΩ resistor on the IREF pin. This rating is specific to its 3×3 DFN package and reflects its thermal design limit-higher currents (up to 2.0A) require the 4×4 or 5×5 QFN variants like ISL6292-1CR4Z-T. The 1.0A value is guaranteed across -20°C to +70°C ambient temperature.

How does the ISL6292-1CR3 handle over-temperature conditions during charging?

The ISL6292-1CR3 implements charge current thermal foldback starting at +100°C junction temperature. As die temperature rises above this threshold, the IC automatically reduces charge current to limit further temperature increase-ensuring safe operation even on small PCBs with limited copper area. This behavior is documented in Figure 12 of the FN9105 datasheet and is intrinsic to the 3×3 DFN package's thermal characteristics.

Can the ISL6292-1CR3 be used with USB power sources?

Yes, the ISL6292-1CR3 supports USB power sources through three IREF programming modes: logic-high (>1.3V) for 500mA (USB500), logic-low (<0.4V) for 100mA (USB100), or resistor-based (e.g., 80kΩ) for 1.0A. Its 4.3V–6.5V input range accommodates 5V USB ports, and its <1µA battery leakage current preserves charge when disconnected-making it fully compliant with USB power delivery constraints.

What is the function of the V2P8 pin on the ISL6292-1CR3?

The V2P8 pin on the ISL6292-1CR3 outputs a regulated 2.8V reference voltage when VIN exceeds the power-on reset threshold (≥3.4V). It serves dual purposes: indicating adapter presence and biasing external circuitry-capable of sourcing up to 2mA. Unlike general-purpose LDOs, V2P8 is tightly coupled to the POR circuit, making it a reliable system power-good signal without additional supervision components.

Does the ISL6292-1CR3 support automatic recharge, and at what voltage threshold?

Yes, the ISL6292-1CR3 supports automatic recharge triggered when battery voltage drops to 3.90V-the recharge threshold for the ISL6292-1 variant. After full-charge completion and STATUS pin latching HIGH, the IC monitors VBAT continuously; once VBAT falls below 3.90V, it initiates a new charge cycle including preconditioning (if needed), CC, and CV phases-ensuring the battery remains at optimal state-of-charge during intermittent use.