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HomeProductsIntegrated Circuits (ICs)PMIC - Power Distribution Switches, Load DriversTPS2557DRBT
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TPS2557DRBT - Texas Instruments

Manufacturer Part Number
TPS2557DRBT
Manufacturer
Texas Instruments
Allelco Part Number
32D-TPS2557DRBT
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
43,570 pcs available, New & Original
Parts Description
IC PWR SWITCH N-CHAN 1:1 8SON
Package
8-SON (3x3)
Data sheet
TPS2557DRBT.pdf

PCN Design/Specification

Mult Dev Material Chg 29/Mar/2018.pdf

HTML Datasheet

TPS2556, 2557 Series.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 43570
  • Unit Price: $1.489
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $1.489 $1.49
10+ $1.462 $14.62
30+ $1.444 $43.32
100+ $1.425 $142.50
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

TPS2557DRBT Tech Specifications
Texas Instruments - TPS2557DRBT technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - TPS2557DRBT

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply (Vcc/Vdd) Not Required
Voltage - Load 2.5V ~ 6.5V
Switch Type General Purpose
Supplier Device Package 8-SON (3x3)
Series -
Rds On (Typ) 22mOhm
Ratio - Input:Output 1:1
Package / Case 8-VDFN Exposed Pad
Package Tape & Reel (TR)
Output Type N-Channel
Product Attribute Attribute Value
Output Configuration High Side
Operating Temperature -40°C ~ 125°C (TJ)
Number of Outputs 1
Mounting Type Surface Mount
Interface On/Off
Input Type Non-Inverting
Features Slew Rate Controlled, Status Flag
Fault Protection Current Limiting (Adjustable), Over Temperature, UVLO
Current - Output (Max) 5A
Base Product Number TPS2557

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 2 (1 Year)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

TPS2557DRBT Image
TPS2557DRBT (1)

Manufacturer Part Number

TPS2557DRBT

Manufacturer

Texas Instruments

Introduction

Precision Adjustable Current-Limited Power-Distribution Switch

Product Features and Performance

Precision current limiting

Adjustable current-limit threshold

Slew rate controlled load switching

On/Off control via digital input

Automatic retry fault management

Status flag for fault indication

Thermal shutdown protection

Reverse voltage blocking

Under-voltage lockout (UVLO)

Product Advantages

Highly accurate current limit (±10% at 1.5A)

Low Rds(on) for higher efficiency and lower heat dissipation

Supports 2.5V to 6.5V voltage range

Capable of supplying up to 5A continuous current

Robust thermal performance with operating temperature from -40°C to 125°C

Small form factor with 8-SON (3x3) package

TPS2557DRBT Image
TPS2557DRBT (2)

Key Technical Parameters

Output Current (Max): 5A

Rds On (Typical): 22mOhm

Voltage - Load: 2.5V – 6.5V

Number of Outputs: 1

Output Configuration: High Side

Input Type: Non-Inverting

Quality and Safety Features

Current Limiting (Adjustable)

Over Temperature Protection

Under-Voltage Lock Out

Compatibility

General compatibility with a wide range of microcontrollers and digital systems due to non-inverting On/Off interface

Application Areas

USB ports and hubs

Hot-swap power supplies

Industrial controls

Peripheral power management

Portable and battery-powered equipment

Product Lifecycle

Active status

Not impending discontinuation

Replacements or upgrades are available if necessary

Several Key Reasons to Choose This Product

Accurate control of current for system reliability

Adjustability of current limit provides flexibility in application use

Highly efficient power distribution minimizing system losses

Built-in safety features ensure protection against fault conditions

Versatile compatibility with different systems and applications

Extended operating temperature range suitable for harsh environments

Reliable power management solution from a reputable manufacturer

Frequently Asked Questions(FAQ)

How does the TPS2557DRBT handle inrush current control during power-up, and what are the design implications for capacitive loads?
The TPS2557DRBT features slew rate control that regulates the turn-on ramp of the output voltage to limit inrush current. This is critical when driving large capacitive loads, as uncontrolled charging can stress both the switch and upstream supply rails. For a 100µF load at 5V, the device limits peak inrush current to approximately 2–3A, assuming typical slew rate settings. Designers must ensure the external RC network connected to the SS pin is sized appropriately—typically 10nF to 100nF capacitor with a resistor from 0V to VCC—to fine-tune the soft-start timing without exceeding thermal or voltage margin constraints.
What is the maximum allowable continuous load current for the TPS2557DRBT, and how does Rds(on) impact efficiency in battery-powered applications?
The TPS2557DRBT supports a maximum continuous output current of 5A. At this level, conduction losses become significant due to its Rds(on) of 22mΩ (typical). For example, delivering 4A to a load results in a power dissipation of I² × Rds(on) = (4)² × 0.022 = 0.352W, requiring careful PCB layout and thermal management. In battery-powered systems operating at 3.7V, such losses directly reduce effective runtime. Therefore, while the device supports high-current applications, designers should minimize sustained currents above 3A unless adequate heat sinking or copper area is available.
Can the TPS2557DRBT be used in hot-swap applications, and what protection mechanisms prevent damage during live insertion?
Yes, the TPS2557DRBT is well-suited for hot-swap scenarios due to its integrated fault protections. It includes adjustable current limiting that clamps output current during short-circuit conditions, preventing overstress to the internal FET or downstream circuitry. Additionally, the over-temperature protection shuts down the switch if junction temperature exceeds safe thresholds (typically around 165°C). The UVLO feature ensures the device only turns on when input voltage is within the 2.5V–6.5V range, avoiding undefined states. These safeguards make it suitable for safely connecting peripherals or expansion boards without requiring external surge suppression components.
How does the TPS2557DRBT compare to the TPS2553 in terms of output configuration and interface flexibility?
Unlike the TPS2553, which offers dual-channel outputs and a more complex enable logic, the TPS2557DRBT provides a single high-side N-channel switch controlled via a simple on/off interface. The TPS2557 also integrates a status flag pin not found on earlier models, enabling real-time feedback on overload or thermal events. While the TPS2553 may suit multi-output systems needing independent control, the TPS2557’s streamlined design and higher current capability (5A vs. 3.3A max) favor space-constrained, high-power single-load applications where simplicity and robustness are prioritized.
What precautions should be taken when implementing the TPS2557DRBT near sensitive analog circuits?
The TPS2557DRBT’s switching action generates transient noise on the power rail during turn-on and turn-off due to parasitic inductance and capacitance. To minimize coupling into adjacent analog circuitry, maintain a minimum separation of 3mm between the IC’s ground plane and analog signal traces. Use a local bypass capacitor (0.1µF ceramic) placed within 1mm of the VSS pin, and route the output path through star grounding to avoid ground loops. Additionally, consider placing a small ferrite bead or series resistor (1–10Ω) in series with the output if conducted emissions are a concern in EMI-sensitive environments.
Is it possible to adjust the current limit threshold of the TPS2557DRBT, and what external components are required?
Yes, the TPS2557DRBT supports an externally adjustable current limit using a sense resistor between the load and ground. The threshold is set by selecting Rlim = 0.22V / Ilimit. For instance, to limit current to 3A, use Rlim = 0.22 / 3 ≈ 73mΩ. The resistor should be low-inductance and rated for sufficient power (e.g., >1W for continuous 3A operation). This allows system-level customization based on application requirements, such as protecting motors or LEDs from overcurrent without relying solely on thermal shutdown.
What is the significance of the MSL rating for the TPS2557DRBT, and how does it affect manufacturing handling?
The TPS2557DRBT has an Moisture Sensitivity Level (MSL) of 2, meaning it can withstand one reflow cycle after being exposed to ambient conditions for up to one year before baking is required. During PCB assembly, this necessitates following IPC/JEDEC guidelines for storage, drying, and handling. Failure to adhere could lead to popcorning during soldering, especially in humid environments. Proper documentation and controlled warehouse storage are essential for reliable production outcomes.
How does the operating temperature range of the TPS2557DRBT influence automotive or industrial deployment?
With a junction temperature range spanning from -40°C to +125°C, the TPS2557DRBT meets stringent environmental standards for industrial (-40°C to +85°C) and even some automotive-grade applications (up to +125°C). However, continuous operation near 125°C requires derating of output current based on thermal resistance (θJA). For example, with θJA ≈ 35°C/W, dissipating 0.5W raises the junction by ~17.5°C above ambient, limiting usable current in compact layouts without heatsinking. Thus, while robust, system-level thermal planning remains necessary for long-term reliability under extreme conditions.
Why might a designer choose the TPS2557DRBT over a discrete MOSFET solution for a 5A high-side switch?
The TPS2557DRBT integrates gate drive, current sensing, protection logic, and status reporting in a compact 8-SON package, reducing component count and board space compared to discrete solutions. Discrete implementations require external drivers, protection circuits, and often multiple passives, increasing BOM cost and failure points. The TPS2557’s built-in slew rate control eliminates the need for additional soft-start components, and its fault diagnostics simplify troubleshooting. For moderate-power, single-channel applications, the integration outweighs the marginal efficiency advantage of optimized discrete designs.
How does the package size of the TPS2557DRBT affect PCB layout complexity compared to larger alternatives?
The TPS2557DRBT comes in an 8-VDFN (3x3mm) package, enabling dense layouts ideal for portable or space-limited devices. However, the small footprint demands precise thermal vias under the exposed pad and careful attention to trace width for the 5A current path. Minimum recommended copper weight is 2oz, with wide, short traces to minimize IR drop and heating. Misalignment or insufficient copper can elevate Rds(on) effectively and trigger overtemperature shutdown prematurely, undermining performance despite the IC’s capabilities.
What role does the status flag play in diagnosing faults with the TPS2557DRBT?
The status flag (FLT) actively signals fault conditions such as overcurrent, overtemperature, or undervoltage lockout. It pulls low when an error occurs, allowing the host microcontroller to monitor system health without polling. For instance, if the load draws more than the set current limit, FLT goes low immediately, enabling fast response times. This feature enhances diagnostic granularity compared to devices without feedback, supporting predictive maintenance and reducing downtime in mission-critical deployments.
Can the TPS2557DRBT operate without a separate Vcc supply?
Yes, the TPS2557DRBT is internally powered from the input voltage rail itself, eliminating the need for an external Vcc supply. This simplifies power architecture in battery-operated or unregulated line-powered systems. Internal bias generation ensures proper gate drive levels as long as Vin remains above the UVLO threshold (typically 2.5V), making it ideal for low-voltage, single-supply designs without auxiliary rails.
How do you calculate total system efficiency when using the TPS2557DRBT in a 3.3V application?
Total efficiency η = (Pload) / (Pload + Ploss_conduction + Ploss_switching). For a 3.3V system delivering 3A: Pload = 9.9W. Ploss_conduction = I² × Rds(on) = 9 × 0.022 = 0.198W. Switching losses are minimal due to slew-controlled turn-on, but assume ~0.05W for transitions. Total loss ≈ 0.25W, yielding η ≈ 9.9 / 10.15 ≈ 97.5%. Efficiency drops sharply at lower loads due to fixed overheads, so it performs best under moderate-to-high duty cycles.
Are there any known limitations regarding reverse polarity protection when using the TPS2557DRBT?
The TPS2557DRBT does not provide inherent reverse polarity protection. Applying a negative voltage relative to ground can damage the IC. If reverse polarity risk exists, an external Schottky diode in series with the input or a dedicated reverse-blocking circuit must be added. Alternatively, some systems use a back-to-back MOSFET configuration, but this increases complexity. Designers should assess input isolation requirements early to avoid costly redesigns post-manufacturing.
How does the TPS2557DRBT support compliance with RoHS and REACH regulations?
The TPS2557DRBT is fully RoHS3 compliant, meaning it contains no restricted substances like lead, mercury, or cadmium above legal thresholds. It is also REACH unaffected, indicating no SVHC (Substance of Very High Concern) content exceeding 0.1% by weight. These certifications ensure the part meets global environmental directives, facilitating use in consumer, medical, and industrial markets without additional material testing or substitution efforts.
What considerations apply when cascading multiple TPS2557DRBT units on the same bus?
Cascading multiple TPS2557DRBT switches on a shared bus introduces cumulative Rds(on), potential contention during simultaneous switching, and increased risk of fault propagation. Each unit adds 22mΩ in series, degrading signal integrity at high currents. Moreover, fault currents from one channel could exceed another’s limit. Unless coordinated via enable signals and current sharing resistors, this topology risks instability. It's generally preferable to use separate branches or integrate dedicated bus drivers instead.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments TPS2557DRBT

Product Attribute TPS2557QDRBTQ1 TPS2557QDRBRQ1 TPS2557DRBR TPS2556DRBT
Part Number TPS2557QDRBTQ1 TPS2557QDRBRQ1 TPS2557DRBR TPS2556DRBT
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Ratio - Input:Output - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Output Type - Current - Unbuffered Voltage - Buffered -
Base Product Number - DAC34H84 MAX500 ADS62P42
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Load - - - -
Switch Type - - - -
Output Configuration - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Fault Protection - - - -
Current - Output (Max) - - - -
Features - - - Simultaneous Sampling
Interface - - - -
Input Type - - - Differential
Number of Outputs - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Rds On (Typ) - - - -
Series - - - -
Voltage - Supply (Vcc/Vdd) - - - -

TPS2557DRBT Datasheet PDF

Download TPS2557DRBT pdf datasheets and Texas Instruments documentation for TPS2557DRBT - Texas Instruments.

PCN Design/Specification
Mult Dev Material Chg 29/Mar/2018.pdf
HTML Datasheet
TPS2556, 2557 Series.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

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TPS2557DRBT Image

TPS2557DRBT

Texas Instruments
32D-TPS2557DRBT

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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