Toshiba Semiconductor and Storage TCK305G,LF

Overview

TCK305G from Toshiba is a 28 V high-input-voltage, single-input–single-output load switch IC with overvoltage protection (OVLO = 10.5 V typ.), reverse current blocking, and thermal shutdown. It delivers 3.0 A DC output current with 73 mΩ typical ON resistance at 4.5 V input and –1.0 A load, and features active-low CE/VCT control, open-drain FLAG output, and inrush current reduction-designed for battery charge management in space-constrained portable electronics.

For engineers reviewing the TCK305G datasheet, TCK305G pinout, TCK305G application, or TCK305G equivalent, key selection considerations include its WCSP9 ultra-small package (1.5 mm × 1.5 mm), dual UVLO/OVLO thresholds (2.9 V / 10.5 V), slew-rate-controlled turn-on, and guaranteed reverse current blocking in OFF state-critical for power rail sequencing and fault-protected battery systems.

Technical Context

The TCK305G integrates an N-channel MOSFET main switch with internal charge pump, enabling low R_ON operation across 2.3–28 V input range. Its dual-lockout circuitry independently monitors VIN against UVLO (2.9 V rising) and OVLO (10.5 V rising) thresholds to disable switching outside safe voltage windows.

Control logic combines active-low CE and VCT pins with internal 530 kΩ pull-down resistors; FLAG asserts high-impedance only when VIN is within valid range and thermal shutdown is inactive. The device implements hardware-based inrush limiting via controlled VOUT rise time (~2 ms) and blocks reverse current by fully isolating VOUT from VIN when switched off.

Key Specifications

Pinout & Package

Package: WCSP9 (Wafer Chip Scale Package, 1.5 mm × 1.5 mm, 0.5 mm pitch, 3.5 mg typical weight). Ultra-compact footprint optimized for high-density mobile PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCK305G, the TPS22916BLYFPR trades voltage robustness for smaller size and lower cost in low-VIN applications, while the RT9711CGJ5 extends input range but removes the integrated FLAG diagnostic signal-making TCK305G optimal where compact 28 V operation with real-time status reporting is essential.

Availability

TCK305G is available at Aetrix Electronics and suitable for battery charge management, USB-C power delivery sink control, and portable medical sensor hub power gating requiring stable component supply and long-term lifecycle support.

Supply support for TCK305G 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 consumer, industrial, and automotive markets, with emphasis on power efficiency and miniaturization.

The TCK30 series was developed specifically for high-density portable electronics requiring robust, ultra-compact load switching with integrated voltage supervision and reverse current protection-targeting smartphone, wearables, and battery-powered IoT endpoints.

FAQ

What is the maximum continuous output current rating for the TCK305G?

The TCK305G supports 3.0 A DC continuous output current under specified thermal conditions (mounted on FR4 4-layer board). This rating assumes proper PCB copper area and ambient temperature ≤85°C. Pulse current capability reaches 4.0 A for 1 ms pulses at 1% duty cycle, as defined in Absolute Maximum Ratings.

Does the TCK305G provide reverse current blocking, and how is it implemented?

Yes, the TCK305G provides hardware-enforced reverse current blocking when the main switch is OFF. This is achieved through internal N-channel MOSFET architecture that physically isolates VOUT from VIN. Unlike passive diode-based solutions, this feature eliminates forward voltage drop and associated power loss, making it ideal for bidirectional power path integrity in battery systems.

What are the voltage thresholds for overvoltage and undervoltage lockout in the TCK305G?

The TCK305G features a typical overvoltage lockout (OVLO) threshold of 10.5 V (rising) with ±1.4 V tolerance, and a typical undervoltage lockout (UVLO) threshold of 2.9 V (rising) with ±0.6 V tolerance. Both functions operate independently and disable the main switch when VIN falls outside the 2.9–10.5 V window, ensuring safe operation across battery discharge and surge conditions.

How does the FLAG pin function in the TCK305G?

The FLAG pin on the TCK305G is an open-drain output that goes high-impedance only when VIN is within the valid UVLO–OVLO window (2.9–10.5 V), CE is asserted LOW, and thermal shutdown is inactive. Outside these conditions-including during UVLO/OVLO faults or thermal shutdown-the FLAG pin pulls low. This provides real-time hardware status feedback without requiring microcontroller polling.

What is the package type and size of the TCK305G, and what are its mounting requirements?

The TCK305G uses the WCSP9 package: a 1.5 mm × 1.5 mm wafer-level chip-scale package with 0.5 mm pitch and typical height of 0.5 mm. It requires standard reflow soldering per JEDEC J-STD-020. Mounting must follow the specified land pattern (provided in Toshiba's package drawing), and thermal performance depends on using a 4-layer FR4 board (40 mm × 40 mm) with adequate copper pour under the die for heat dissipation.