Texas Instruments TPS2552DBVT-1

Overview

TPS2552DBVT-1 from Texas Instruments is a precision adjustable current-limited power-distribution switch with latch-off functionality, designed for USB port protection. It delivers up to 1.5 A continuous load current, features ±6% current-limit accuracy at 1.7 A (typ), 85-mΩ on-resistance in SOT-23 package, and fast 2 µs overcurrent response. It operates from 2.5 V to 6.5 V input and integrates reverse-voltage protection and thermal shutdown.

For engineers reviewing the TPS2552DBVT-1 datasheet, TPS2552DBVT-1 pinout, TPS2552DBVT-1 application, or TPS2552DBVT-1 equivalent, this page provides verified functional identity, confirmed SOT-23-6 pin mapping, exact current-limit programming range (75 mA–1.7 A), latch-off behavior under fault, and validated alternatives for USB-compliant power switching designs.

Technical Context

The TPS2552DBVT-1 uses an internal charge pump to drive an N-channel MOSFET high-side switch, enabling full enhancement down to 2.5 V input. Its constant-current limiting is replaced by latching-off during overcurrent or reverse-voltage events - triggered when V_OUT exceeds V_IN by 135 mV (typ) for 4 ms - and requires enable toggle or power cycle to recover.

It incorporates deglitched FAULT assertion (7.5 ms for overcurrent, 4 ms for reverse voltage), undervoltage lockout (2.4 V turn-on with 25 mV hysteresis), and built-in soft-start via controlled rise/fall times (1.1–1.5 ms rise, 0.2–0.5 ms fall). Thermal shutdown activates at 135°C (current-limit mode) or 155°C (normal operation), with 10°C hysteresis.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package with exposed PowerPAD™ thermally connected to GND; 2.90 mm × 1.60 mm body size, JEDEC MO-178AC compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-limited power-switch applications.

Compared with TPS2553DBVT-1, the TPS2552DBVT-1 offers direct compatibility with active-low enable logic and identical protection features; versus AP22653WU-7, it provides higher current capability, tighter accuracy, and critical reverse-voltage blocking essential for robust USB port design.

Availability

TPS2552DBVT-1 is available at Aetrix Electronics and suitable for USB host ports, digital TV peripheral hubs, VOIP phone charging interfaces, and set-top box front-panel slots requiring stable component supply, long-term lifecycle support, and certified safety compliance.

Supply support for TPS2552DBVT-1 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and communications reach.

The TPS255x family was designed specifically for precision current-limited power distribution in USB-compliant systems, emphasizing latch-off safety, reverse-voltage immunity, and ±6% accuracy across temperature - directly addressing reliability gaps in legacy polyfuses and basic switches.

FAQ

What is the key functional difference between TPS2552DBVT-1 and TPS2552DBVT?

The TPS2552DBVT-1 implements latch-off behavior during overcurrent or reverse-voltage faults - it shuts down and holds off until the enable pin is toggled or power is cycled. In contrast, the non-"-1" version (TPS2552DBVT) enters constant-current mode and continues delivering regulated current. This makes TPS2552DBVT-1 safer for USB host applications where uncontrolled retry could damage peripherals or upstream circuitry. The TPS2552DBVT-1 retains identical pinout, current-limit range, and protection features otherwise.

How do I calculate the R_ILIM resistor value for a 1.2 A current limit with TPS2552DBVT-1?

For TPS2552DBVT-1, use the formula R_ILIM = 18.6 kΩ / I_LIM(A). At 1.2 A, R_ILIM = 18.6 kΩ / 1.2 = 15.5 kΩ. A standard 1% metal-film resistor of 15.4 kΩ or 15.8 kΩ is appropriate; TI specifies 15 kΩ ≤ R_ILIM ≤ 232 kΩ for stability. The device achieves ±6% accuracy at higher thresholds like 1.2 A, making this value suitable for USB-compliant 1.2 A port designs.

Does TPS2552DBVT-1 provide reverse-voltage protection, and how does it behave?

Yes, TPS2552DBVT-1 provides reverse-voltage protection: its internal comparator disables the MOSFET when V_OUT exceeds V_IN by 135 mV (typ) for 4 ms (typ). During this condition, FAULT asserts low. Unlike the constant-current versions, the TPS2552DBVT-1 remains latched off even after V_OUT falls below V_IN - recovery requires toggling EN or cycling power. This prevents backfeed into upstream sources and protects input-side components in shared-bus systems.

What is the maximum continuous output current supported by TPS2552DBVT-1, and what conditions apply?

The TPS2552DBVT-1 supports up to 1.5 A continuous output current, but only at junction temperatures ≤105°C. At higher temperatures (up to 125°C), the rated maximum drops to 1.2 A per the Recommended Operating Conditions table. This derating is enforced by thermal foldback: if sustained overload raises T_J to 135°C (typ) while in current limit, the device cycles off until cooled by 10°C. The 1.5 A rating assumes adequate PCB copper area for the PowerPAD™ and ambient ≤55°C.

Can TPS2552DBVT-1 be used in a 3.3 V input application, and what performance trade-offs exist?

Yes, TPS2552DBVT-1 operates from 2.5 V to 6.5 V, so 3.3 V input is fully supported. At 3.3 V, r_DS(on) increases slightly (to ~105 mΩ typ vs. 85 mΩ at 6.5 V), raising conduction loss - e.g., 168 mW at 1.2 A - but remains within thermal limits with proper layout. Rise/fall times also lengthen (tr ≈ 0.85 ms, tf ≈ 0.35 ms), which softens inrush but may affect transient response. All protection features (UVLO, FAULT, thermal shutdown) remain fully functional at 3.3 V.