LP2985A-50DBVR Voltage Regulators

Technical Specifications of LP2985A-50DBVR

Datasheet	LP2985A-50DBVR datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – Voltage Regulators – Linear
Manufacturer	Texas Instruments
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Regulator Topology	Positive Fixed
Voltage – Output	5V
Current – Output	150mA
Voltage – Dropout (Typical)	0.28V @ 150mA
Number of Regulators	1
Voltage – Input	Up to 16V
Current – Limit (Min)	–
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5

LP2985A-50DBVR Description

The LP2985 is a fixed-output, wide-input, low-noise, low-dropout voltage regulator with an input voltage range of 2.5 V to 16 V and a maximum load current of 150 mA. The operational voltage range for the LP2985’s output is 1.2 V to 5.0 V. (for a new chip). Additionally, the LP2985 (new chip output)’s accuracy of 1% across load and temperature enables it to deliver precise power to low-voltage microcontrollers (MCUs) and processors.

The module’s low output noise of 30 VRMS (with 10-nF bypass capacitors) and broad bandwidth PSRR performance of more than 70 dB at 1 kHz and 40 dB at 1 MHz help to lower the switching frequency of an upstream DC/DC converter and lessen the requirement for post regulator filtering. The incorporated soft-start time and current limit protection cap the amount of power drained from the input during startup and reduces inrush current. There are built-in overcurrent and overheating protections and other basic safety features. The LP2985 is available in a 5-pin SOT-23 (DVB) package with dimensions of 2.9 mm by 1.6 mm.

LP2985A-50DBVR Feature

• The voltage of the new chip can be anywhere between 2.5 V and 16 V.
• The new chip’s VOUT voltage range is between 1.2 V and 5.0 V. (fixed, 100- mV steps). The new chip maintains an output accuracy of 1% regardless of load or temperature.
• Up to 150 mA of output current.
• 71 A at ILOAD = 0 mA indicates a low IQ (new chip).
• With a new chip and a low IQ, the current draw is 750 A at an ILOAD of 150 mA.

Detailed Description

The LP2985 is a fixed-output, low-noise, high-PSRR, low-dropout regulator that offers excellent performance at an affordable price for both stationary and mobile applications. The new chip, the LP2985, has an output tolerance of 1% across the line, load, and temperature fluctuations and can deliver a constant current of 150 mA. This device has an internal output pulldown, thermal shutdown, integrated overcurrent protection, a soft-start mechanism, and thermal shutdown. With both line and load, this gadget performs superbly during transients. The appliance may operate in a temperature range of -40 to +125 degrees Celsius.

Feature Description

● Output Enable

An active-high pin connects the device’s ON/OFF switch. The output voltage is turned on when the ON/OFF pin voltage is greater than the high-level input voltage and turned off when it is lower. If separate control of the output voltage is unnecessary, connect the ON/OFF pin to the device’s input. When the device is disabled, the internal pulldown circuit releases the output voltage by lowering the voltage at the ON/OFF pin below the low-level input value of the ON/OFF pin.

● Dropout Voltage

It is defined as the input voltage minus the output voltage when the pass transistor is completely on, and the rated output current (IRATED) is present (VIN – VOUT). In the table of optimal circumstances for operation, the maximum IOUT is IRATED. The pass transistor operates in its switch capacity in the ohmic or triode region. Indirectly, the dropout voltage specifies a minimum input value higher than the nominal intended output voltage expected to keep the output voltage in regulation. The output voltage will likewise decrease if the input voltage falls below the nominal output regulation.

● Current Limit

The regulator is protected by an internal current limit circuit in the device from abrupt high-load current problems or shorting incidents. The barrier that is in place right now is unclimbable.

The output voltage is not regulated when the gadget hits its current limit. When a current limit event happens, the device starts to heat up due to the increased power dissipation. When the pass transistor’s current limit is reached, it consumes energy [(VIN – VOUT ICL)]. If heat shutdown is triggered, the device turns off. After the gadget has cooled down, the internal thermal shutdown circuit switches it back on. The device will alternate between the current limit and thermal shutdown if the output current fault status continues for more information on existing restrictions.

● Undervoltage Lockout (UVLO)

The device has a dedicated under-voltage lockout (UVLO) circuit that checks the input voltage and toggles the output voltage on and off safely and reliably.

● Thermal Shutdown

When the junction temperature (TJ) of the pass transistor reaches TSD(shutdown), the device’s thermal shutdown protection circuit disables the device (typical). With thermal shutdown hysteresis, you can be sure that the device will reset (turn on) when the temperature reaches TSD(reset) (typical). Since the semiconductor die has a relatively short thermal time constant, the device can undergo thermal shutdown and cycle on and off to reduce power dissipation. Big VIN – VOUT voltage drops across the device or strong inrush currents charging large output capacitors can lead to significant power dissipation at startup. The thermal shutdown safeguard will prevent the device from starting under certain conditions.

● Dropout Operation

The device enters dropout mode if the input voltage exceeds the nominal output voltage plus the specified dropout voltage but otherwise meets the specifications for normal operation. The output voltage in this mode follows the input voltage. In this mode, the pass transistor is in the ohmic or triode region and operates as a switch, severely reducing the device’s transient performance. Large variations in the output voltage can be caused by line or load transients during dropout.

The pass transistor is biased into the ohmic or triode region when the device is in a steady dropout state, which is defined as immediately following a normal regulation state (VIN VOUT(NOM) + VDO) but not during start-up. The output voltage is allowed to briefly overshoot if the input voltage exceeds the nominal output voltage plus the dropout voltage (VOUT(NOM) + VDO). Still, the device will then pull the pass transistor back into the linear region.

Conclusion

This linear regulator, model LDO LP2985A-50DBVR, from Texas Instruments, provides stable power, which is suitable for improved processing. It has a dropout voltage of 0.001 V at 0 A, 0.007 V at 1 mA, 0.04 V at 10 mA, 0.12 V at 50 mA, and 0.28 V at 150 mA. Overall, it is about 1% accurate. This voltage regulator has a single output that can generate up to 0.15 A of current. This will provide enough power for your circuit with an input voltage as low as 2.2 V and as high as 16 V.

Power management at its finest, with a constant 5 V output. With a line regulation of 0.014%/V, your circuit can reliably deliver a constant current at its output. This item will be packaged on tape and reel for easy assembly and secure transport. It has a positive polarity. As for the highest dropout voltage, it is 0.35 V at 150 mA. This voltage regulator can function at temperatures between -40 degrees Celsius and 125 degrees Celsius.

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