TPS27081ADDCR High-Side Load Switch: Diagram, Pinout, and Datasheet

The TPS27081ADDCR is a load switch that can handle up to 8 volts and 3 amps. The device uses an ultra-low resistance P-channel MOSFET to reduce voltage drop for low voltage and high current rails, lowering the dropout voltage via the device.

The device includes a customizable slew rate that aids in reducing or eliminating power supply droop caused by large inrush currents. The device exhibits very low leakage currents when it is turned off.

The TPS27081ADDCR combines a Power PFET and a Control NFET into a single small package, and has ESD protection on all pins, allowing for better ESD compatibility with other onboard components.

The TPS27081ADDCR level shifts ON/OFF  logic signals to VIN levels and supports CPU or MCU logic as low as 1-V to manage higher voltage power sources without the need for an external level-shifter.

Using a quick ON/OFF  logic signal to switch a large value output capacitor CL may result in an excessive inrush current. Connect a resistor R2 and an external capacitor C1 as illustrated in the Simplified Schematic to manage the load inrush current. Refer to the Application and Implementation section to set the TPS27081ADDCR to obtain a specific slew rate.

In standby power switch applications, a single pullup resistor R1 is required. When inrush current regulation is not required, connect the R2 pin of the TPS27081ADDCR to system ground in such situations.

The following shows TPS27081ADDCR Pinout.

Pinout

The followings are TPS27081ADDCR Symbol, Footprint and 3D Model.

Symbol

Footprint

3D Model

• Low ON-Resistance, High-Current PFET

– RDS(on) = 32 mΩ at VGS = –4.5 V

– RDS(on) = 44 mΩ at VGS = –3 V

– RDS(on) = 82 mΩ at VGS = –1.8 V

– RDS(on) = 93 mΩ at VGS = –1.5 V

– RDS(on) = 155 mΩ at VGS = –1.2 V

• Adjustable Turnon and Turnoff Slew Rate Control Through External R1, R2, and C1

• Supports a Wide Range of 1.2-V to 8-V Supply Inputs

• Integrated  NMOS  for PFET Control

• NMOS ON/OFF Supports a Wide Range of 1-V to 8-V Control Logic Interface

• Full ESD Protection (All Pins)

– HBM 2 kV, CDM 500 V

• Ultra-Low Leakage Current in Standby (Typical 100 nA)

• Available in Tiny 6-Pin Package

– 2.9 mm × 2.8 mm × 0.75 mm SOT (DDC)

The following figure is TPS27081ADDCR Functional Block Diagram.

Functional Block Diagram

The TPS27081ADDCR Simplified Schematic is shown as follows.

Simplified Schematic

Use proper PCB layout techniques for the device's optimal operating performance, such as: 

•  VIN  and VOUT traces should be as short and wide as feasible to allow high current.

• Ceramic bypass capacitors with low ESR should be used to connect the VIN pin to ground. 1-F ceramic with X5R or X7R dielectric is a standard recommended bypass capacitance. This capacitor should be as close as feasible to the device pins.

• Ceramic bypass capacitors with low ESR should be used to connect the VOUT pin to ground. The suggested bypass capacitance is one-tenth of the VIN bypass capacitor with dielectric ratings of X5R or X7R.

This capacitor should be as close as feasible to the device pins.

Layout

Standard Load Switching Application

The TPS27081ADDCR is a high-side load switch with a power PFET and a control NMOS integrated in a small package. Internal components of the device are rated for an 8-V supply and can handle up to 3 A of load current.

The device can be used for a wide range of purposes. The TPS27081ADDCR device is used to manage the load inrush current as shown in the diagram below.

Standard Application Diagram

• High-Side Load Switches

• Inrush Current Control

• Power Sequencing and Control

• Standby Power Isolation

• Portable Power Switches

The TPS27081ADDCR Package is shown as follows.

Package

Texas Instruments Incorporated (TI) is an American technology corporation based in Dallas, Texas, that creates and manufactures semiconductors and integrated circuits for electronic designers and manufacturers around the world. Based on sales volume, it is one of the top ten semiconductor businesses in the world. Analog chips and embedded processors, which account for more than 80% of the company's revenue, are the company's main focus. TI also makes calculators, microcontrollers, and multi-core processors, as well as TI digital light processing technologies and education technology.