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Product details

Parameters

Number of channels (#) 1 Vin (Min) (V) 1.62 Vin (Max) (V) 5.5 Imax (A) 0.235 Ron (Typ) (mOhm) 400 Shutdown current (ISD) (Typ) (uA) 0.1 Quiescent current (Iq) (Typ) (uA) 1.3 Soft start Fixed Rise Time Rise time (Typ) (us) 35 Features Inrush current control, Thermal shutdown Operating temperature range (C) -40 to 85 open-in-new Find other Load switches

Package | Pins | Size

DSBGA (YZP) 6 2 mm² .928 x 1.428 open-in-new Find other Load switches

Features

  • Ultralow Quiescent Current 1 µA (Typical)
    at VIN = 1.8 V
  • Input Voltage Range: 1.62 V to 5.5 V
  • Low ON-Resistance
    • rON = 300 mΩ at VIN = 5.5 V
    • rON = 400 mΩ at VIN = 3.3 V
    • rON = 500 mΩ at VIN = 2.5 V
    • rON = 600 mΩ at VIN = 1.8 V
  • Selectable Minimum Current Limit:
    155 mA, 70 mA, or 30 mA
  • Integrated Inrush Current Time-out (8 ms)
  • Shutdown Current: < 1 µA
  • Thermal Shutdown
  • Fault Blanking
  • Auto Restart
  • Overcurrent Condition Time-out (Automatic
    Disable for Permanent Overcurrent)
  • 1.8-V Compatible Control Input
  • ESD Performance Tested Per JESD 22
    • 6000-V Human-Body Model
      (A114-B, Class II)
  • Tiny DSGBA Package 1.4 mm × 0.9 mm (YZP)
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Description

The TPS22946 is an ultralow power load switch that provides protection to systems and loads in high-current conditions. The device contains a 300-mΩ current-limited P-channel MOSFET that can operate over an input voltage range of 1.62 V to 5.5 V. The switch is controlled by an on/off input (ON), which can interface directly with low-voltage control signals. The TPS22946 includes thermal shutdown protection that prevents damage to the device when a continuous over-current condition causes excessive heating by turning off the switch.

When the switch current reaches the maximum limit, the TPS22946 operates in a constant-current mode to prohibit excessive currents from causing damage. The current limit can be selected using the CL input: a high CL input sets the current limit to 155 mA, a low CL input sets the current limit to 70 mA, and a floating CL input sets the current limit to 30 mA.

If the constant current condition persists after 10 ms, the switch is turned off and the fault signal pin (OC) is pulled low. The TPS22946 has an auto-restart feature which turns the switch on again after 70 ms if the ON pin is still active. If the TPS22946 remains in an over-current condition for 5 seconds, the device shuts off until it is turned on again by setting the ON control signal off and then on.

If the device is used to protect an LDO, the inrush current required by the LDO at startup can, in some cases, exceed the current limit and initiate a blanking (current limiting) condition. The TPS22946 provides allowance for this scenario during startup of the LDO by temporarily increasing the current limit to 435 mA for 8 ms after the load switch is enabled.

The TPS22946 is available in space-saving 6-pin DSBGA (YZP) package. The device is characterized for operation over the free-air temperature range of –40°C to 85°C.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 10
Type Title Date
* Datasheet TPS22946 Ultralow Power, Low Input Voltage, Current-Limited Load Switch With Shutoff, Auto-Restart, and Overcurrent Condition Time-Out datasheet (Rev. B) Apr. 08, 2015
Application note Load Switch Thermal Considerations (Rev. A) Oct. 11, 2018
Application note Basics of Load Switches (Rev. A) Sep. 05, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Basics of eFuses (Rev. A) Apr. 05, 2018
Technical articles How can a load switch extend your device’s battery life? Mar. 20, 2018
Technical articles How and why you should use load switches for power sequencing Feb. 06, 2018
Technical articles How to use load switches and eFuses in your set-top box design Nov. 23, 2017
Technical articles Don’t leave it floating! Power off your outputs with quick output discharge Dec. 09, 2016
User guide Using the TPS22946EVM-499 Single Channel Load Switch IC Feb. 26, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
25
Description

The TPS22946EVM-499 evaluation module (EVM) allows the user to connect power to and control the TPS22946 ultra-small, CSP-6 package load switch. Parameters such as on state resistance, slew rate and current limit properties can be easily evaluated.

Features
  • Input voltage range: 1.62 V to 5.5 V
  • Continuous current up to 155mA
  • Access to the VIN, VOUT, ON , and CL pins
  • Jumpers to select input capacitance, output capacitance and output resistance

Design tools & simulation

SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
RTD replacement for cold junction compensation reference design in a temperature sensor
TIDA-010019 — Temperature-sensing applications that use a thermocouple (TC) require an accurate local temperature sensor to achieve high accuracy. Solutions for design challenges such as cold-junction compensation (CJC) or including an ultra-low power TC analog front-end are highlighted and addressed in this (...)
document-generic Schematic
REFERENCE DESIGNS Download
Flat-Clamp TVS based Reference Design for Protection Against Transient for Grid Applications
TIDA-010008 — This reference design features multiple approaches for  protecting AC or DC analog input, DC analog output, AC or DC binary input, digital output with a high side or low side driver, LCD bias supply, USB interfaces (power and data) and onboard power supplies with 24, 12 or 5V input used in (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
DSBGA (YZP) 6 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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