Part Number: TLV1117LV33DCYR

Manufacturer: Texas Instruments

Description: IC REG LINEAR 3.3V 1A SOT223-4

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Technical Specifications of TLV1117LV33DCYR

Datasheet  TLV1117LV33DCYR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – Linear
Manufacturer Texas Instruments
Packaging Digi-Reel?
Part Status Active
Regulator Topology Positive Fixed
Voltage – Output 3.3V
Current – Output 1A
Voltage – Dropout (Typical) 0.455V @ 1A
Number of Regulators 1
Voltage – Input Up to 5.5V
Current – Limit (Min) 1.1A
Operating Temperature -40°C ~ 125°C
Mounting Type Surface Mount
Package / Case TO-261-4, TO-261AA
Supplier Device Package SOT-223-4

TLV1117LV33DCYR Introduction

Have your electrical equipment malfunctioned or crashed due to abrupt power fluctuations? Stable power is vital for efficient processing and optimal performance, and Texas Instruments LDO TLV1117LV33DCYR linear regulator may help you achieve just that. This voltage regulation device delivers stable and accurate power management with a maximum power dissipation of 1590 mW and an overall accuracy of 1.5%. Its 3.3 V fixed output voltage and 35mV load regulation make it ideal for use in a programmed DC power supply. So, if you want to ensure constant and stable power for your electronic equipment, the LDO TLV1117LV33DCYR linear regulator is the way to go.

Description for the TLV1117LV

The TLV1117LV low-dropout (LDO) linear regulator is a low-input-voltage variant of the well-known TLV1117 voltage regulator.

The TLV1117LV is a very low-power device that consumes 500 times less quiescent current than typical 1117 voltage regulators, making it ideal for applications requiring a very low standby current. The TLV1117LV LDO is likewise stable at 0 mA; Because there is no minimum load requirement, the device could be helpful in applications where the regulator must give extremely low loads during standby while also supplying huge currents on the order of 1 A during regular operation. When the load current need fluctuates from less than 1 mA to more than 500 mA, the TLV1117LV exhibits excellent line and load transient performance, resulting in very tiny magnitude undershoots and overshoots of output voltage.

1.5% precision is provided through a precision band-gap and error amplifier. The device’s extraordinarily high power-supply rejection ratio (PSRR) allows it to be used as a post-regulation device after a switching regulator. Low output noise and low dropout voltage are also advantageous.

The gadget is internally adjusted to be stable with 0-ESR capacitors. These fundamental benefits allow for the adoption of low-cost, small-size ceramic capacitors. Lower-cost capacitors with higher bias voltages and temperature derating can be employed if needed.


  • Stable With a current output of 0 mA.
  • For VOUT = 3.3 V, the dropout is 455 mV at 1 A.
  • Temperatures can range from -40°C to +125°C.
  • Overcurrent and thermal shutdown protection.

Detailed Description

The TLV1117LV is a low quiescent current, high PSRR LDO that can handle up to 1 A of load current. This device includes circuit blocks for an integrated current limit, thermal shutdown, band-gap reference, and undervoltage lockout (UVLO).

Feature Description

● Internal Current Limit

The internal current limit of the TLV1117LV protects the regulator during fault conditions. During the current limit, the output generates a constant current independent of the output voltage. The output voltage is not regulated in this scenario and can be computed using the formula: VOUT = ILIMIT RLOAD. The PMOS pass transistor dissipates ILIMIT (VIN – VOUT) until thermal shutdown occurs and the device switches off. When the device cools down, the inbuilt thermal shutdown circuit reactivates it. If the malfunction persists, the device alternates between the current limit and thermal shutdown.

The voltage regulator TLV1117LV incorporates a PMOS pass transistor with an integrated body diode. When the diode’s output (OUT) voltage exceeds the voltage at the input (IN), current flows. It should be noted that this current is not naturally limited; thus, use caution when using the regulator in reverse voltage mode. Limiting the current to no more than 5% of the specified output current is recommended to ensure safe operation, especially when extended reverse voltage operation is planned.

● Dropout Voltage

The TLV1117LV regulator achieves a low dropout voltage using a PMOS pass transistor. The PMOS pass transistor runs in the linear area when the difference between the input voltage (VIN) and the output voltage (VOUT) is less than the dropout voltage (VDO), with an input-to-output resistance equal to the transistor’s RDS(ON). It’s worth noting that the PMOS transistor behaves like a resistor in dropout mode, and the dropout voltage scales roughly with the output current. However, like with any linear regulator, when the (VIN – VOUT) voltage approaches the dropout voltage, the regulator’s power supply rejection ratio (PSRR) and transient response can be significantly impacted.

Application Information

The TLV1117LV is a high-current linear regulator with a low quiescent current. The TLV1117LV consumes much less quiescent current than traditional high-current linear regulators. This gadget performs well in terms of line and load transients. The device has a low noise level and a high PSRR. As a result, this device is intended for high-current applications requiring extremely sensitive power-supply rails. This regulator provides both current and thermal protection. The device’s operational junction temperature range is -40°C to +125°C.

Layout Guidelines

Input and output capacitors should be as close to the device pins as practicable. Design the board with distinct ground planes for VIN and VOUT, with the ground plane linked solely at the device’s GND pin to improve characteristic AC performance. Furthermore, the ground connection for the output capacitor must be directly linked to the device’s GND pin. ESR capacitors with higher values can reduce PSRR performance.

● Thermal Protection

Thermal protection inhibits the output when the junction temperature climbs to around 165°C, enabling the device to cool. The output circuitry is re-enabled when the junction temperature drops to around 145°C. The thermal protection circuit can be turned on and off based on thermal resistance, power consumption, and ambient temperature.

This cycle reduces the regulator’s dissipation, preventing it from damage caused by overheating. Any tendency to activate the thermal protection circuit implies an insufficient heat sink or excessive power dissipation. Limit junction temperature to 125°C at most for reliable operation. Increase the ambient temperature until the thermal protection is triggered; utilize worst-case loads and signal circumstances to determine the margin of safety in a complete design (including heat sink).

The TLV1117LV’s internal protective circuitry is intended to defend against overload circumstances. This circuitry is not meant to take the place of adequate heat sinking. Running the TLV1117LV into thermal shutdown on a regular basis reduces device reliability.


In conclusion, Texas Instruments’ LDO TLV1117LV33DCYR linear regulator is a remarkable voltage regulation device providing dependable and precise electronic device power management. Its superior power dissipation, set output voltage, precision, load regulation, and tape and reel compact make it an excellent choice for programmable DC power supplies and other electronic applications.

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