Active Current Limiting Circuit Schematic
The TPS2557DRBT power-distribution switch is designed for applications that demand precise current limiting or that include significant capacitive loads and short circuits. This article mainly introduces Features, Pinout, Datasheet and other detailed information about Texas Instruments TPS2557DRBT.
The TPS2557DRBT power-distribution switch is designed for applications that demand precise current limiting or that include significant capacitive loads and short circuits. These devices have an external resistor that can be used to preset a current-limit threshold between 500 mA and 5.0 A (typ). To minimize current surges during turn on/off, the rise and fall times of the power switch are managed.
When the output load reaches the current-limit threshold, the TPS2557DRBT device switches to a constant-current mode, limiting the output current to a safe level.
During overcurrent and overtemperature conditions, the FAULT logic output asserts low.
The TPS2557DRBT Pinout is shown as follows.
Pinout
| Pin Number | Pin Name | Description |
| 4 | EN | Enable input, logic high turns on power switch |
| 1 | GND | Ground connection; connect externally to PowerPAD |
| 2,3 | IN | Input voltage; connect a 0.1 μF or greater ceramic capacitor from IN to GND as close to the IC as possible. |
| 8 | FAULT | Active-low open-drain output, asserted during overcurrent or overtemperature conditions. |
| 6,7 | OUT | Power-switch output |
| 5 | ILIM | External resistor used to set current-limit threshold; recommended 20 kΩ ≤ RILIM ≤ 187 kΩ. |
| PowerPAD™ | Internally connected to GND; used to heat-sink the part to the circuit board traces. Connect PowerPAD to GND pin externally. |
The TPS2557DRBT CAD Model is shown as follows.
Symbol
Footprint
3D Model
• Meets USB Current-Limiting Requirements
• Adjustable Current Limit, 500 mA–5 A (typ)
• +/- 6.5% Current-Limit Accuracy at 4.5 A
• Fast Overcurrent Response - 3.5-μS (typ)
• 22-mΩ High-Side MOSFET
• Operating Range: 2.5 V to 6.5 V
• 2-μA Maximum Standby Supply Current
• Built-in Soft-Start
• 15 kV / 8 kV System-Level ESD Capable
• UL Listed* – File No. E169910
• CB & Nemko Certification *
• *RILIM ≥ 24.9 kΩ (5A maximum)
| Attribute | Value |
|---|---|
| Lifecycle Status | ACTIVE (Last Updated: 4 days ago) |
| Factory Lead Time | 6 Weeks |
| Contact Plating | Gold |
| Package / Case | 8-VDFN Exposed Pad |
| Mounting Type | Surface Mount |
| Mount | Surface Mount |
| Number of Pins | 8 |
| Weight | 24.012046mg |
| Turn Off Delay Time | 6 ms |
| Packaging | Tape & Reel (TR) |
| Operating Temperature | -40°C~125°C TJ |
| JESD-609 Code | e4 |
| Pbfree Code | yes |
| Part Status | Active |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
| Number of Terminations | 8 |
| Termination | SMD/SMT |
| ECCN Code | EAR99 |
| Resistance | 22mOhm |
| Power Rating | 2.403W |
| Max Power Dissipation | 2.403W |
| Terminal Position | DUAL |
| Peak Reflow Temperature (Cel) | 260 |
| Number of Functions | 1 |
| Supply Voltage | 5V |
| Terminal Pitch | 0.65mm |
| Base Part Number | TPS2557 |
| Pin Count | 8 |
| Number of Outputs | 1 |
| Output Type | N-Channel |
| Attribute | Value |
|---|---|
| Max Output Current | 5A |
| Number of Channels | 1 |
| Voltage | 6.5V |
| Interface | On/Off |
| Analog IC - Other Type | POWER SUPPLY SUPPORT CIRCUIT |
| Current | 5A |
| Output Configuration | High Side |
| Power Dissipation | 2.4W |
| Output Current | 5A |
| Voltage - Supply (Vcc/Vdd) | Not Required |
| Adjustable Threshold | YES |
| Input Type | Non-Inverting |
| Turn On Delay Time | 9 ms |
| Switch Type | General Purpose |
| Min Input Voltage | 2.5V |
| Max Input Voltage | 6.5V |
| Nominal Input Voltage | 6.5V |
| Ratio - Input:Output | 1:1 |
| Voltage - Load | 2.5V~6.5V |
| Fault Protection | Current Limiting (Adjustable), Over Temperature, UVLO |
| Rds On (Typ) | 22m Ω |
| Features | Slew Rate Controlled, Status Flag |
| Height | 1mm |
| Length | 3mm |
| Width | 3mm |
| Thickness | 880μm |
| RoHS Status | ROHS3 Compliant |
| Radiation Hardening | No |
| REACH SVHC | No SVHC |
| Lead Free | Lead Free |
The following is TPS2557DRBT Functional Block Diagram.
Functional Block Diagram
The TPS2557DRBT Typical Application is given below.
Typical Application as USB Power Switch
| Part Number | Description | Manufacturer |
| TPS2557QDRBRQ1POWER CIRCUITS | Automotive 0.5-5A adjustable ILIMIT, 2.5-6.5V, 22mΩ USB power switch, active-high 8-SON -40 to 125 | Texas Instruments |
| TPS2557QDRBTQ1POWER CIRCUITS | Automotive 0.5-5A adjustable ILIMIT, 2.5-6.5V, 22mΩ USB power switch, active-high 8-SON -40 to 125 | Texas Instruments |
| TPS2557QDRBPOWER CIRCUITS | IC POWER SUPPLY SUPPORT CKT, Power Management Circuit | Texas Instruments |
| TPS2557DRBPOWER CIRCUITS | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, PLASTIC, SON-8 | Texas Instruments |
| TPS2557DRBRPOWER CIRCUITS | 0.5-5A adjustable ILIMIT, 2.5-6.5V, 22mΩ USB power switch, active-high 8-SON -40 to 125 | Texas Instruments |
• USB Ports/Hubs
• Digital TV
• Set-Top Boxes
• VOIP Phones
The following figure is TPS2557DRBT Package.
Package
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