Toshiba Semiconductor and Storage TCK208G,LF

Overview

TCK208G,LF from Toshiba Electronic Devices & Storage Corporation is an ultra-low-voltage 0.75 V load switch IC with reverse current blocking, active-low control logic, and integrated output auto-discharge. It delivers 2.0 A DC output current, 18.4 mΩ typical ON resistance at 0.75 V/−1.5 A, and operates across 0.75–3.6 V input range-designed for power rail sequencing in space-constrained portable electronics.

For engineers reviewing the TCK208G,LF datasheet, TCK208G,LF pinout, TCK208G,LF application, or TCK208G,LF equivalent, key selection criteria include its active-low CONTROL interface, WCSP4C package footprint, slew-rate-controlled turn-on/off timing, and guaranteed reverse current blocking in SW OFF state-critical for battery-powered subsystem isolation and voltage rail management.

Technical Context

The TCK208G,LF integrates a single N-channel MOSFET pass switch with charge-pump gate drive enabling reliable operation down to 0.75 V VIN. Its active-low CONTROL pin (VIH = 0.9 V min at VIN ≥ 0.9 V; VIL ≤ 0.4 V) directly interfaces with low-voltage logic without level shifting. Unlike TCK206G/TCK207G, it lacks internal pull-down, requiring external logic assertion for defined startup behavior.

It features dual-MOSFET architecture: Q1 handles main power path conduction and reverse blocking, while Q2 enables controlled VOUT discharge during turn-off. Discharge on-resistance is 380 Ω (typ.), ensuring rapid VOUT decay (<50 μs fall time at 1.2 V) without external components-essential for preventing back-powering of downstream circuits during power-down sequences.

Key Specifications

Pinout & Package

Package: WCSP4C (0.9 mm × 0.9 mm, 0.5 mm pitch, 0.5 mm height, 0.9 mg typical weight) - ultra-compact wafer-level chip-scale package 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 TCK207G,LF and TPS22916BYFPR, the TCK208G,LF uniquely combines active-low control, guaranteed reverse blocking, and monolithic auto-discharge in a 0.9 mm² WCSP - reducing total solution size and eliminating external discharge components required by alternatives.

Availability

TCK208G,LF is available at Aetrix Electronics and suitable for smartphone subsystem power gating, wearable sensor hub management, USB-C port power delivery negotiation, and LPDDR4 memory I/O rail control requiring stable component supply across high-volume consumer electronics production.

Supply support for TCK208G,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 and manufactures high-efficiency, miniaturized semiconductor solutions for consumer, industrial, and automotive markets, with emphasis on power management and analog signal conditioning.

The TCK208G,LF belongs to Toshiba's ultra-low-voltage load switch IC product line, engineered specifically for power rail isolation and sequencing in space-constrained, battery-operated portable devices operating below 1.0 V.

FAQ

What is the minimum input voltage supported by the TCK208G,LF?

The TCK208G,LF supports a minimum input voltage of 0.75 V, verified across −40°C to 85°C ambient temperature. This enables direct use with sub-1 V processor I/O rails and energy-harvesting sources. Operation below 0.75 V is not guaranteed per Toshiba's absolute maximum ratings and electrical characteristics tables. The TCK208G,LF maintains specified RON, IQ(OFF), and reverse blocking performance down to this threshold.

Does the TCK208G,LF require an external pull-down resistor on the CONTROL pin?

No, the TCK208G,LF does not integrate an internal pull-down resistor on the CONTROL pin-unlike TCK206G and TCK207G. Its CONTROL pin is open-drain compatible and logic-tolerant (up to 4.0 V), but requires active driving to defined high or low states. Leaving CONTROL floating results in undefined output behavior. The TCK208G,LF relies on external circuitry to assert the active-low signal reliably.

How does the reverse current blocking function operate in the TCK208G,LF?

The TCK208G,LF implements hardware-based reverse current blocking by disabling the internal N-channel pass MOSFET (Q1) when the CONTROL pin is high (SW OFF state). This prevents current flow from VOUT to VIN, limiting reverse leakage to ≤10 μA maximum at VOUT = 3.6 V and VIN = 0 V. The function is intrinsic to the device architecture and requires no external components. It is active independently of auto-discharge and remains effective across the full operating temperature range.

What is the purpose of the auto-discharge feature in the TCK208G,LF?

The auto-discharge feature in the TCK208G,LF activates an internal 380 Ω discharge path between VOUT and GND when the CONTROL pin is high (SW OFF state), rapidly draining residual charge from downstream capacitance. This prevents back-powering of upstream sources, avoids false wake-up events, and ensures clean power-down sequencing. Measured VOUT fall time is 50 μs (typ.) under 1.2 V/500 Ω/0.1 μF conditions. The TCK208G,LF integrates this function without requiring external resistors or timers.

Can the TCK208G,LF be used with input voltages above 3.6 V?

No-the TCK208G,LF has an absolute maximum input voltage rating of 4.0 V, but its guaranteed operational range is strictly 0.75 V to 3.6 V per Toshiba's DC characteristics table. Exceeding 3.6 V may cause parametric degradation or reliability risk, even if below the 4.0 V absolute limit. The TCK208G,LF is not rated for 5 V systems. For higher-voltage applications, alternative load switches such as Toshiba's TCK107AG or TI's TPS22975 should be evaluated.