Part Number: TPS2051BDBVR

Manufacturer: Texas Instruments

Description: IC PWR SWITCH N-CHAN 1:1 SOT23-5

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Technical Specifications of TPS2051BDBVR

Datasheet  TPS2051BDBVR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Power Distribution Switches, Load Drivers
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Switch Type General Purpose
Number of Outputs 1
Ratio – Input:Output 1:1
Output Configuration High Side
Output Type N-Channel
Interface On/Off
Voltage – Load 2.7 V ~ 5.5 V
Voltage – Supply (Vcc/Vdd) Not Required
Current – Output (Max) 500mA
Rds On (Typ) 95 mOhm
Input Type Non-Inverting
Features Status Flag
Fault Protection Current Limiting (Fixed), Over Temperature, UVLO
Operating Temperature -40°C ~ 125°C (TJ)
Package / Case SC-74A, SOT-753
Supplier Device Package SOT-23-5

TPS2051BDBVR Description

The TPS20xxB power distribution switches are designed for use in environments with a high probability of encountering strong capacitive loads and short circuits. For power distribution systems that need several power switches in a single package, these components have 70-m N-channel MOSFET power switches. Logic enables input to activate each switch. To reduce current spikes caused by switching, a charge pump is built inside the gate drive.

The charge pump may run on voltages as low as 2.7 V without the aid of any additional parts. The device controls the output current to a safe level by switching into constant-current mode and lowering the overcurrent (OCx) logic output when the output load exceeds the current-limit threshold, or there is a short. A thermal protection circuit disables the switch to prevent damage from occurring when the junction temperature rises due to continual heavy overloads and short circuits, which increase the power dissipation in the switch. When the device has cooled down enough, it will automatically restart after a thermal shutdown. This is because the switch is disabled by internal circuitry until sufficient input voltage exists. The current limiting feature of this power switch is rated at 1 A. (typical).

TPS2051BDBVR Features

  • High-Side MOSFET of 70 m.
  • Constant Current of 500 mA.
  • Protection from thermal and short circuits.
  • Operational Voltage: 2.7 to 5.5 Volts.
  • Normal Rising Time: 0.6 ms.
  • Lockout due to Undervoltage.
  • Report of a Deglitched Fault (OC).
  • OC Glitch Absent During Power Up.
  • 1-A (single, dual) or 2-A is the maximum standby supply current (Triple, Quad).
  • -40°C to 85°C is the range of the ambient temperature.
  • File Number E169910, UL Recognized.
  • Additional UL Recognition for the Ganged Configuration of TPS2042B and TPS2052B.

TPS2051BDBVR Applications

  • Heavy Capacitive Loads
  • Short-Circuit Protections

TPS2051BDBVR Detailed Description

TPS20xxB devices are current-limited power distribution switches with a continuous load current of 0.5 A. To meet the demands of power-distribution systems, these devices incorporate numerous N-channel MOSFET power switches into a single compact package with a resistance of 70 m. The current spikes caused by switching are kept to a minimum thanks to the gate driver provided by the built-in charge pump. The charge pump functions with as little as 2.7 V in input voltage.

TPS2051BDBVR Feature Description

● Power Switch

The low on-state resistance of the N-channel MOSFET power switch ensures reliable operation. The power switch is a high-side switch, so when it is turned off, electricity cannot flow from the outlet to the outlet or from the outlet to the outlet. Switching on the power will provide at least 500 mA.

● Charge Pump

To lift the gate of the MOSFET above the source, the driver circuit receives power from an internal charge pump. The input voltage for the charge pump can be as low as 2.7 V, and it only needs a little supply current to function.

● Driver

The driver manages this power switch’s gate voltage. The driver includes circuitry to regulate the rise and fall times of the output voltage, which limits big current surges and the resulting electromagnetic interference (EMI).

● Enable (ENx)

The supply current can be reduced by turning off the power switch, and the bias for the charge pump, driver, and other circuits by toggling the logic enable pin. With a logic high on EN, the supply current drops to less than 1 A or 2 A. The switch is activated by applying a logic zero to the EN input, which grounds the drive and control circuits. All CMOS and TTL logic levels can be used with the enabled input.

● Enable (ENx)

To lessen the supply current, the logic enables turning off the power switch and the bias for the charge pump, driver, and other circuitry. As long as ENx is logic low, the supply current is limited to less than 1 A or 2 A. Switching on the drive and control circuits is as simple as inputting a logic high into the ENx input to restore bias. All CMOS and TTL logic levels can be used with the enabled input.

● Overcurrent (OCx)

In the presence of an overcurrent or overtemperature condition, it is argued that the OCx open-drain output (active low). Until the overcurrent or overtemperature issue is resolved, the output will continue to be asserted. The OCx signal is protected from oscillation and erroneous triggering by a deglitch circuit that operates at 10 ms. Overheating shutdown triggers immediate OCx assertion.

● Current Sense

The amount of current going into the load is measured by a sensing FET. Current is measured more accurately by the sensing FET than by measuring resistance. The current-sense circuitry triggers a control signal to the driver in the event of an overload or short circuit. The driver locks the output current at a constant value regardless of the load voltage by lowering the gate voltage and driving the power FET into saturation.

● Thermal Sense

The TPS20xxB has built-in thermal sensing that records the switch’s operational temperature. Junction temperature increases in overcurrent and short-circuits conditions. Overcurrent circumstances can cause the die temperature to increase to about 140 degrees Celsius, at which point the inbuilt thermal sensor circuitry shuts off the switch to protect the device. The thermal sense contains an inbuilt hysteresis, so the switch will turn on once the gadget has cooled by about 10 degrees. Unless the problem is fixed, the switch will repeatedly cycle off and on. In the event of an overtemperature shutdown or overcurrent, the output of open-drain false reporting (OCx) will state (active low).

Power Supply Recommendations

● Undervoltage Lockout (UVLO)

At power on, an Undervoltage lockout keeps the power switch depressed. A fast shutoff occurs once the input voltage drops to around 2 V or less. When it is impossible to turn off the power switch before input power is withdrawn, this simplifies the design of hot-insertion devices. Even if the switch is activated, the power supply won’t activate until the UVLO detects that it has reached at least 2 V. Upon reinsertion, power is restored with a gradual increase in voltage that limits electromagnetic interference and voltage spikes.

● Power Dissipation

N-channel MOSFETs have a low on-resistance; therefore, even though they come in tiny surface-mount packages, they can still carry significant currents. For this reason, it is standard design practice to measure power dissipation and junction temperature, as the thermal resistances of these packages are significantly higher than those of power packages. Initially, the N-channel MOSFET’s rDS(on) must be calculated regarding the input voltage and the operating temperature.


In conclusion, if you need to manage power flow to various electronic gadgets, the Texas Instruments TPS2051BDBVR high-side and USB power distribution switch are an outstanding option. This component is efficient and dependable, needing a minimum of 2.7 V and a maximum of 1.25 A in voltage and current, respectively. In addition to a wide operating temperature range (-40 C to 85 C), it comes in tape and reel packaging for secure shipment and easy installation.

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