Toshiba Semiconductor and Storage TCKE905ANA,RF

Overview

TCKE905ANA from Toshiba Electronic Devices & Storage Corporation is a 23 V input, 4 A adjustable eFuse IC with auto-retry overcurrent protection, 5.7 V typical overvoltage clamp, and WSON8 package. It functions as a reusable power switch in USB VBUS, storage supply, and battery charging circuits, delivering 34 mΩ typical R_ON, adjustable slew rate via external capacitor, and thermal shutdown at 155 °C.

For engineers reviewing the TCKE905ANA datasheet, TCKE905ANA pinout, TCKE905ANA application, or TCKE905ANA equivalent, this page provides verified functional specifications, validated WSON8 terminal mapping, confirmed overvoltage clamp accuracy (5.4–6.0 V), real-world inrush control behavior, and two rigorously cross-checked alternative parts for 5 V rail protection.

Technical Context

The TCKE905ANA integrates a low-R_ON N-channel MOSFET power switch with dual-stage overcurrent protection: fast-trip short-circuit response (2.0 μs) and adjustable current limit (0.5–4.0 A via R_ILIM). Its EN/UVLO pin supports both enable control and externally programmable under-voltage lockout thresholds using resistor dividers.

Overvoltage protection operates via a fixed 5.7 V (typ.) clamp with 6.0 μs response at 4 A load, while slew rate is precisely controlled by an external capacitor on the dV/dT pin-enabling inrush current management without compromising startup timing. The FLAG pin provides open-drain fault signaling for OVC, OCL, UVLO, and thermal events.

Key Specifications

Pinout & Package

Package: WSON8 (2.0 mm × 2.0 mm × 0.8 mm max), thermally enhanced with exposed pad connected to GND for stability and heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar eFuse applications.

Compared with TPS25942LARVTT and RT9711CGQW, the TCKE905ANA uniquely delivers 23 V operation with 5.7 V ±0.3 V OVC accuracy, 4 A capacity, and independent slew rate control-making it the only option for high-reliability 5 V rail protection in wide-input, space-constrained applications.

Availability

TCKE905ANA is available at Aetrix Electronics and suitable for USB VBUS protection, storage power supply, and battery charging input applications requiring stable component supply, long-term lifecycle support, and IEC62368-1 compliance.

Supply support for TCKE905ANA 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

Toshiba Electronic Devices & Storage Corporation designs high-reliability semiconductor solutions for power management, motor control, and interface applications, with global manufacturing and quality certification.

The TCKE9 series targets high-density, high-voltage power distribution in portable and industrial electronics, emphasizing adjustable protection, thermal resilience, and compact WSON8 packaging for next-generation power architectures.

FAQ

What is the overvoltage clamp voltage of the TCKE905ANA?

The TCKE905ANA features a fixed overvoltage clamp threshold of 5.7 V (typical), with a guaranteed range of 5.4 V to 6.0 V across temperature. This value is specific to the TCKE905ANA variant and differs from other members of the TCKE9 family such as the TCKE903ANA (3.87 V) or TCKE912ANA (13.7 V). The clamp activates within 6.0 μs at 4 A load to protect downstream 5 V logic.

Does the TCKE905ANA support adjustable current limiting?

Yes, the TCKE905ANA supports adjustable overcurrent protection from 0.5 A to 4.0 A using an external resistor (R_ILIM) connected between the ILIM pin and GND. Valid resistance values range from 487 Ω to 5000 Ω, with 487 Ω yielding ~4.09 A (typ.) and 5000 Ω yielding ~0.49 A (typ.). The TCKE905ANA datasheet provides the exact R_ILIM–I_LIM transfer function for precision setting.

What package does the TCKE905ANA use and what are its thermal requirements?

The TCKE905ANA uses the WSON8 package (2.0 mm × 2.0 mm × 0.8 mm max) with an exposed thermal pad that must be soldered to a PCB GND plane for stable operation and effective heat dissipation. At 4 A output, junction temperature rise is managed by the 34 mΩ R_ON and thermal shutdown at 155 °C (20 °C hysteresis), requiring minimum 4-layer FR4 board layout per Toshiba's rated 2.0 W power dissipation specification.

How does the TCKE905ANA handle short-circuit events?

The TCKE905ANA implements dual-level short-circuit protection: a fast-trip comparator triggers within 2.0 μs when output current exceeds 1.6× the programmed I_LIM, followed by current limiting. If the fault persists, thermal shutdown activates at 155 °C, then auto-retries every 55 ms. This layered response prevents destructive energy buildup while enabling automatic recovery after transient faults clear.

Is the TCKE905ANA compatible with 3.3 V logic control signals?

Yes-the EN/UVLO pin of the TCKE905ANA has a 1.20 V (typ.) rising threshold and 1.10 V (typ.) falling threshold, making it fully compatible with standard 3.3 V GPIO outputs. A 3.3 V logic high reliably enables the device, and a 3.3 V logic low disables it. No level-shifting is required, and the pin tolerates up to 25 V, allowing direct connection to VIN for simplified enable-by-default configurations.