Toshiba Semiconductor and Storage TCKE805NL,RF

Overview

TCKE805NL,RF from Toshiba Electronic Devices & Storage Corporation is a 18 V, 5 A eFuse IC with adjustable overcurrent protection, reverse current blocking control, and fixed 6.04 V (typ.) overvoltage clamp. It integrates a low-R_ON 28 mΩ (typ.) internal power MOSFET and supports external N-channel FET gate drive for reverse current blocking. Designed for high-density power rail protection in HDD power supplies and battery charging circuits.

For engineers reviewing the TCKE805NL,RF datasheet, TCKE805NL,RF pinout, TCKE805NL,RF application, or TCKE805NL,RF equivalent, this page delivers verified electrical specs, WSON10B package mapping, latch-mode fault response, thermal shutdown behavior, and real-world design implications of its dV/dT-controlled slew rate and ILIM resistor programming.

Technical Context

The TCKE805NL,RF implements a single-input/single-output eFuse architecture with integrated gate driver for external reverse-blocking N-ch MOSFETs and internal 28 mΩ power switch. Its latch-type fault response permanently disables output after overcurrent, short-circuit, or thermal shutdown until EN/UVLO is cycled - unlike auto-retry variants.

It features dual-function EN/UVLO pin enabling both enable control and programmable under-voltage lockout via external resistive divider, plus dedicated dV/dT pin for external capacitor-based slew rate tuning (200–700 μs ramp time, typ.) and ILIM pin for precise current limit setting (0.5–5.15 A, typ., via 20–250 kΩ resistor).

Key Specifications

Pinout & Package

Package: WSON10B (3.0 mm × 3.0 mm, 0.7 mm height, 0.5 mm pitch), thermally enhanced exposed pad, IEC62368-1 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCKE805NA,RF, the TCKE805NL,RF provides deterministic fault containment via latched shutdown, eliminating uncontrolled retry loops. Against TPS25942LARVCR, it trades slightly higher R_ON for built-in 6.04 V OVP and smaller WSON10B footprint - optimizing for compact 5 V system protection rather than raw current capacity.

Availability

TCKE805NL,RF is available at Aetrix Electronics and suitable for hard disk drive power supplies, USB-C battery charging circuits, and industrial SSD power management requiring stable component supply, long-term lifecycle assurance, and IEC62368-1 compliance.

Supply support for TCKE805NL,RF 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 analog and power semiconductors for industrial, computing, and consumer applications, with emphasis on safety-certified protection ICs and energy-efficient power solutions.

The TCKE8xx series was developed specifically for high-density, high-reliability power rail protection in storage subsystems and portable electronics - prioritizing latch-mode safety, integrated OVP, and minimal external component count.

FAQ

What is the overvoltage clamp voltage of the TCKE805NL,RF?

The TCKE805NL,RF features a fixed overvoltage clamp of 6.04 V (typ.) at the VOUT pin. This value is guaranteed across temperature (5.62–6.45 V, min/max) and activates when input voltage exceeds the clamp threshold, protecting downstream 5 V logic. Unlike the TCKE800NL, the TCKE805NL,RF includes this function; it is not adjustable and does not require external components to operate.

How does the latch-type fault response of the TCKE805NL,RF differ from auto-retry eFuses?

The TCKE805NL,RF enters a latched shutdown state after overcurrent, short-circuit, or thermal shutdown events - output remains disabled until the EN/UVLO pin is actively toggled from low to high. This contrasts with auto-retry variants like TCKE805NA,RF, which attempt periodic recovery. The latch behavior ensures no uncontrolled power restoration in persistent fault conditions, making TCKE805NL,RF ideal for safety-critical 5 V rail protection.

Can the TCKE805NL,RF be used without an external MOSFET for reverse current blocking?

Yes - the TCKE805NL,RF operates fully functional without an external MOSFET. Its internal 28 mΩ power switch handles forward conduction, and the EFET pin may be left floating if reverse current blocking is not required. When reverse blocking is needed, the EFET pin drives the gate of an external N-channel MOSFET (e.g., SSM6K513NU), but this is optional and does not affect basic eFuse operation of the TCKE805NL,RF.

What is the recommended external capacitor value for dV/dT control on the TCKE805NL,RF?

The TCKE805NL,RF supports dV/dT capacitors from 1 nF (typ.) to 100 nF (max). A 1 nF capacitor yields ~2.3 ms VOUT ramp time, while open-circuit gives 200–700 μs. For USB-C inrush suppression, 1–10 nF is typical; for HDD spin-up, 10–47 nF balances soft-start and response speed. Always verify ramp time on target PCB due to parasitic capacitance - the TCKE805NL,RF's dV/dT pin is sensitive to layout.

Does the TCKE805NL,RF require external components for under-voltage lockout (UVLO)?

No - the TCKE805NL,RF has built-in UVLO with 4.15 V (typ.) turn-on threshold and 5% hysteresis, activated automatically when EN/UVLO is tied directly to VIN. External resistors on EN/UVLO are optional and only needed to adjust the UVLO threshold (e.g., for custom brown-out points); default operation requires zero external parts beyond the mandatory ILIM resistor and optional dV/dT capacitor.