STMicroelectronics STBP120DVDK6F

Overview

STBP120DVDK6F from STMicroelectronics is an overvoltage protection device featuring an integrated 90 mΩ N-channel MOSFET switch, thermal shutdown, soft-start, and active-low open-drain FLT output - designed to safeguard portable electronics power inputs against up to +28 V overvoltage events per YD/T 1591-2006 compliance.

For engineers reviewing the STBP120DVDK6F datasheet, STBP120DVDK6F pinout, STBP120DVDK6F application, or STBP120DVDK6F equivalent, this device serves as a system-level input protection IC with precise UVLO (3.25 V typ), OVLO (6.4 V typ), 50 ms startup delay, and ESD robustness (±15 kV air discharge) in a compact 2.5 × 2 mm TDFN-10 package.

Technical Context

The STBP120DVDK6F implements a self-contained overvoltage protection architecture using an internal charge pump to drive the high-side N-channel MOSFET, eliminating external gate bias requirements. It continuously monitors VIN against programmable thresholds (UVLO at 3.25 V, OVLO at 6.4 V) and junction temperature (TOFF = 125 °C).

Its dual-direction current capability enables reverse supply current flow (OUT → IN) for peripheral powering, while thermal shutdown with 20 °C hysteresis and fault indication via open-drain FLT ensure safe recovery after fault clearance - all coordinated through EN-controlled enable/disable logic without internal pull-down.

Key Specifications

Pinout & Package

STBP120DVDK6F is housed in a RoHS-compliant 2.5 mm × 2.0 mm × 0.75 mm TDFN-10 package with 0.5 mm pitch and exposed thermal pads (PAD1, PAD2). The package supports efficient PCB heat dissipation and fits space-constrained mobile designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB544RGER and TPD3S014RSBR, STBP120DVDK6F uniquely combines programmable OVLO/UVLO thresholds, thermal shutdown with hysteresis, and integrated charge pump - making it the only option among the three qualified for YD/T 1591-2006-compliant portable power input protection.

Availability

STBP120DVDK6F is available at Aetrix Electronics and suitable for smartphone charging interfaces, digital camera power management, PDA system protection, and MP3 player adapter interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STBP120DVDK6F 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions across automotive, industrial, and consumer markets.

The STBP120 series belongs to ST's dedicated protection IC portfolio, engineered specifically for robust, standards-compliant overvoltage defense in space-constrained portable electronics with stringent ESD and thermal safety requirements.

FAQ

What is the purpose of the FLT pin, and how should it be interfaced?

The FLT pin is an active-low open-drain fault indicator that asserts low during undervoltage, overvoltage, or thermal shutdown events. It must be pulled up externally with a resistor (10 kΩ–1 MΩ) to the host controller's I/O voltage. No internal pull-up exists, and FLT remains active regardless of EN state - enabling independent fault monitoring even when the device is disabled.

Can STBP120DVDK6F support reverse current flow from OUT to IN?

Yes - its N-channel MOSFET topology allows bidirectional conduction. When voltage appears at OUT (e.g., from a battery), current flows first through the body diode, then activates the MOSFET channel once IN exceeds UVLO (3.25 V), minimizing forward drop. Thermal shutdown does not operate during reverse current, so external thermal design remains critical in such configurations.

How does the soft-start function reduce inrush current?

The soft-start is implemented as a fixed 50 ms delay (t_on) between VIN exceeding UVLO and MOSFET turn-on. This prevents simultaneous charging of large downstream capacitors, limiting peak inrush to levels manageable by typical 5 V adapters. The delay is non-adjustable and inherent to the internal timing circuit - no external components are required.

Is the EN pin internally pulled down, and what happens when left floating?

No - the EN pin has no internal pull-down resistor. If left floating, its logic level is undefined and may cause unpredictable enable/disable behavior due to noise coupling. STMicroelectronics explicitly recommends tying EN to GND if unused. For active control, drive it with a clean logic signal; optional series resistor (22–100 kΩ) improves robustness against ESD-induced latch-up.