Toshiba Semiconductor and Storage TPD1052F,LXHF

Overview

TPD1052F,LXHF from Toshiba is a high-side intelligent power switch IC integrating Bi-CMOS control logic and a DMOS power MOSFET in a single PS-8 package. It delivers 0.8 Ω max R_DS(ON) at 12 V/0.5 A, supports direct CMOS/TTL input drive, and provides overcurrent (IOC_clamp = 1.7 A typ.) and overtemperature (T_OT = 160 °C typ.) protection for motor, solenoid, and lamp loads.

For engineers reviewing the TPD1052F,LXHF datasheet, TPD1052F,LXHF pinout, TPD1052F,LXHF application, or TPD1052F,LXHF equivalent, key selection considerations include its integrated diagnosis output (open-collector DIAG), maskable overcurrent detection (adjustable t_mask up to 3.8 ms), latch-reset behavior on IN low, and thermal derating requirements on FR-4 PCBs.

Technical Context

The TPD1052F,LXHF implements a monolithic high-side switch architecture with internal 5 V regulator, current-limiting driver, and dual-protection logic. Its overcurrent response operates in two modes-clamped (IOC_clamp) during mask time and duty-cycled (IOC_duty = 1.3 A typ.) otherwise-while overtemperature detection latches at 160 °C and resets only upon IN deactivation.

Diagnosis is implemented via an NPN open-collector DIAG pin that pulls low and latches during overcurrent or overtemperature events while IN is high; the latch clears automatically when IN returns low. The MASK pin accepts external RC networks (e.g., 1 MΩ + 0.033 μF) to set mask time, preventing false triggering from inrush currents.

Key Specifications

Pinout & Package

Housed in PS-8 (SON8-P-0303-0.65) surface-mount package: 3.0 mm × 3.0 mm × 0.65 mm body, 0.65 mm pitch, 0.017 g typical weight, FR-4 compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side power switch applications.

Compared with TPD1052F,LXHF, the TPD1053F,LXHF offers identical functionality at higher on-resistance, while the VNQ5E02TR-E replaces simple open-collector DIAG with SPI-based reporting but removes analog mask-time configurability - making TPD1052F,LXHF optimal for cost-sensitive, standalone high-side switching with inrush resilience.

Availability

TPD1052F,LXHF is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC outputs, appliance motor control, and smart HVAC actuation requiring stable component supply and long-term lifecycle support.

Supply support for TPD1052F,LXHF 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-reliability power semiconductors, analog ICs, and memory solutions for automotive, industrial, and consumer applications.

The TPD1052F,LXHF belongs to Toshiba's Intelligent Power Device family, engineered specifically for robust, self-protected high-side switching in harsh environments where load fault detection and thermal resilience are critical.

FAQ

What is the maximum continuous output current supported by the TPD1052F,LXHF?

The TPD1052F,LXHF does not specify a fixed maximum continuous output current in its datasheet; instead, it limits current dynamically via built-in protection. Under normal operation, it sustains loads up to 0.5 A with R_DS(ON) ≤ 0.8 Ω. During fault conditions, it clamps current to 1.7 A (typ.) or switches at 1.3 A (typ.), depending on MASK timing. Actual continuous current depends on PCB thermal design, ambient temperature, and duty cycle - with channel temperature limited to 150 °C.

How does the MASK pin function in the TPD1052F,LXHF, and what happens if it is left unconnected?

If the MASK pin of the TPD1052F,LXHF is left open (unconnected), the device defaults to IOC_duty overcurrent protection mode only - meaning it will cycle on/off during overload rather than clamp current. This avoids false trips from inrush but sacrifices immediate current limiting. To enable IOC_clamp during startup transients, connect an RC network (e.g., 1 MΩ + 0.033 μF) to set t_mask ≈ 3.8 ms. The TPD1052F,LXHF datasheet explicitly states that opening MASK disables clamp-mode protection.

Can the TPD1052F,LXHF be used with a 24 V supply voltage?

No, the TPD1052F,LXHF is not rated for continuous 24 V operation. Its absolute maximum V_DD is 25 V DC, but the recommended operating range is 5–18 V. At 24 V, the internal 5 V regulator and DMOS structure exceed safe thermal and electrical stress margins, risking premature failure. For 24 V systems, consider Toshiba's TPD1054F,LXHF or alternate high-voltage high-side switches. Always verify V_DD derating per the TPD1052F,LXHF thermal resistance data (R_th(ch–a) = 357.2 °C/W on standard FR-4).

What is the purpose of the N.C. pins (2 and 7) on the TPD1052F,LXHF, and how should they be handled on the PCB?

Pins 2 and 7 of the TPD1052F,LXHF are designated No-Connect (N.C.) - they are not bonded internally and serve no electrical function. Per Toshiba's datasheet, these pins must remain unconnected on the PCB layout. Do not tie them to GND, VDD, or any other net. Leaving them floating is acceptable and required; soldering or routing to other signals may cause unintended coupling or violate qualification testing boundaries. Their presence supports mechanical stability and package compatibility across the TPD105x family.

How does the DIAG pin behavior differ between overcurrent and overtemperature events in the TPD1052F,LXHF?

In the TPD1052F,LXHF, the DIAG pin behaves identically for both overcurrent and overtemperature faults: it pulls low and latches when either condition occurs while the IN pin is high. There is no electrical distinction on the DIAG line between the two fault types - the same open-collector signal asserts for both. Differentiation requires correlating DIAG assertion timing with IN state transitions and system context (e.g., rapid DIAG activation after load energization suggests overcurrent; slow onset during sustained operation suggests overtemperature). The TPD1052F,LXHF does not provide separate diagnostic outputs for each fault class.