Toshiba Semiconductor and Storage TCK22894G,LF

Overview

TCK22894G,LF from Toshiba Electronic Devices & Storage Corporation is a load switch IC with integrated overcurrent limiting, thermal shutdown, and output auto-discharge functions. It delivers 1540 mA output current limit, 31 mΩ typical ON resistance at 5.0 V input, and ultra-low 25 μA quiescent current - enabling high-efficiency power sequencing in space-constrained portable electronics such as smartphones and wearables.

For engineers reviewing the TCK22894G,LF datasheet, TCK22894G,LF pinout, TCK22894G,LF application, or TCK22894G,LF equivalent, key selection criteria include verified 1540 mA current-limit threshold, WCSP6E package compatibility with 0.4 mm pitch layouts, true reverse-current blocking absence, and active-high control logic with internal pull-down.

Technical Context

The TCK22894G,LF integrates a single N-channel MOSFET power switch with fold-back overcurrent protection, thermal shutdown (trip at ~170°C, reset at ~150°C), and an active discharge path via internal NMOS (R_SD = 100 Ω). It operates across 1.4–5.5 V input range and features Schmitt-triggered CONTROL pin with built-in MΩ-level pull-down to ensure default OFF state.

No under-voltage lockout (UVLO) or true reverse current blocking (TRCB) are implemented in this variant - confirmed by Function Table (Page 2) and Electrical Characteristics Note 2. Its AC response includes 40 μs typical turn-on delay and 10 μs turn-off delay into 500 Ω/0.1 μF load, supporting fast, controlled power rail enablement.

Key Specifications

Pinout & Package

Package: WCSP6E (0.8 mm × 1.2 mm, 0.55 mm height, 0.4 mm pitch, 1 mg typical weight), optimized for ultra-dense mobile PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCK2065G and TPS22916BLYFPR, the TCK22894G,LF provides optimal balance of high current capability (1540 mA), minimal quiescent draw (25 μA), and zero-cost feature simplification - ideal for cost- and space-sensitive consumer devices where UVLO and TRCB are unnecessary.

Availability

TCK22894G,LF is available at Aetrix Electronics and suitable for smartphone subsystem power, wearable sensor hub management, and USB-C peripheral port control requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TCK22894G,LF 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-performance analog and power semiconductors for consumer, industrial, and automotive markets, with emphasis on miniaturization, efficiency, and reliability.

The TCK22xxxG series targets portable electronics power management, delivering ultra-small load switches with configurable current limits and integrated protection - engineered specifically for space-constrained, battery-operated applications.

FAQ

What is the maximum continuous output current supported by the TCK22894G,LF?

The TCK22894G,LF is rated for a fixed overcurrent limit of 1540 mA, as specified in its Electrical Characteristics table (Page 5). This is a fold-back type limit that activates under overload or short-circuit conditions. Continuous operation at this level depends on thermal design - the device enters thermal shutdown above ~170°C junction temperature, and derating is recommended per Toshiba's reliability guidelines.

Does the TCK22894G,LF include under-voltage lockout (UVLO) or true reverse current blocking (TRCB)?

No - the TCK22894G,LF does not implement UVLO or TRCB. Per the Function Table (Page 2), these features are marked "N/A" for TCK22894G. Only TCK22946G/TCK22951G/TCK2065G/TCK1024G variants include both. The TCK22894G,LF relies on external supervision for VIN monitoring and lacks full-time reverse-current isolation.

What is the recommended input capacitor value for stable operation of the TCK22894G,LF?

Toshiba recommends placing ≥1.0 μF ceramic capacitors (C_IN) as close as possible to the VIN pins (A2/B2) of the TCK22894G,LF to suppress voltage transients and improve stability. This is specified in the Application Note (Page 7) and applies regardless of load current - critical for preventing false triggering of overcurrent or thermal protection during dynamic load steps.

How does the CONTROL pin behave when left unconnected on the TCK22894G,LF?

The CONTROL pin of the TCK22894G,LF has an internal pull-down resistor equivalent to several MΩ, ensuring the device remains in the OFF state when the pin is open or floating. This eliminates the need for an external pull-down resistor and guarantees safe default behavior during power-up or GPIO initialization delays.

What is the thermal performance of the TCK22894G,LF on a standard FR4 PCB?

On a 40 mm × 40 mm, two-layer FR4 board (50% copper coverage per side), the TCK22894G,LF has a maximum power dissipation rating of 800 mW at 25°C ambient (Page 3). Derating is required above 25°C - e.g., ~500 mW at 60°C ambient - per the PD vs. Ta curve (Page 8). Layout with thermal vias under the GND pad significantly improves heat transfer.