TPS2553DBVR Power-Distribution Switch: Layout, Pinout, and Datasheet

The TPS2553DBVR power-distribution switch provides up to 1.5 A of continuous load current and is designed for situations requiring precision current limiting or heavy capacitive loads and short circuits. Through an external resistor, these devices provide a configurable current-limit threshold between 75 mA and 1.7 A (typical). At the higher current-limit levels, current-limit accuracy of up to 6% can be reached. To reduce current surges during turnon and turnoff, the rise and fall times of the power switch are managed.

When the output load exceeds the current-limit threshold, the TPS2553DBVR device uses a constant-current mode to limit the output current to a safe level. To protect devices on the input side of the switch, an inbuilt reverse-voltage comparator disables the power switch when the output voltage is driven higher than the input voltage. During overcurrent and reverse-voltage circumstances, the FAULT output asserts low.

he following figure is TPS2553DBVR Pinout.

Pinout

The followings are TPS2553DBVR Symbol, Footprint and 3D Model.

Symbol

Footprint

3D Model

• Up to 1.5-A Maximum Load Current

• ±6% Current-Limit Accuracy at 1.7 A (Typical)

• Meets USB Current-Limiting Requirements

• Adjustable Current Limit: 75 mA to 1700 mA (Typical)

• Constant-Current

• Fast Overcurrent Response - 2 µs (Typical)

• 85-mΩ High-Side MOSFET (DBV Package)

• Reverse Input-Output Voltage Protection

• Operating Range: 2.5 V to 6.5 V

• Built-In  Soft Start 

• 15-kV  ESD Protection  per IEC 61000-4-2 (With External Capacitance)

• UL Listed – File No. E169910 and  NEMKO  IEC60950-1-am1 ed2.0

• See the TI Switch Portfolio

The following figure is TPS2553DBVR Functional Block Diagram.

Functional Block Diagram

Layout Guidelines

• The 100-nF bypass capacitor should be placed near the IN and  GND  pins, and the connections should be made with a low-inductance trace, according to TI.

• When substantial transient currents are predicted on the output, TI suggests using a high-value electrolytic capacitor and a 100-nF bypass capacitor on the output pin.

• To avoid parasitic effects on the current limit accuracy, the traces routing the RILIM resistor to the device must be as short as feasible.

• A wide and short copper trace must be used to link the PowerPAD to the PCB ground plane.

Layout

The TPS2553DBVR Typical Application is shown as follows.

Typical Application

Depending on the external system conditions, some applications require varying current-limit thresholds. An implementation for an externally controlled, two-level current-limit circuit is shown in the diagram below. The total resistance from ILIM to GND determines the current-limit threshold. MOSFET Q1 is enabled or disabled by a logic-level input, and the current-limit threshold is changed by changing the total resistance from ILIM to GND. To expand the number of extra current-limit levels, more MOSFET and resistor combinations can be utilized in parallel with Q1/R2.

Two-Level Current-Limit Circuit

• USB Ports and Hubs

• Digital TVs

• Set-Top Boxes

• VOIP Phones

• Power Management

The following shows TPS2553DBVR Package.

Package

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