S-L2980A35MC-TF-G

Current - Output:	150mA
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Protection Features:	--
Control Features:	Enable
PSRR:	65dB (1kHz)
Current - Supply (Max):	140µA
Current - Quiescent (Iq):	1µA
Series:	S-L2980
Voltage Dropout (Max):	0.14V @ 50mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.5V
Voltage - Input (Max):	10V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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S-L2980A35MC-TF-G application field and working principle

S-L2980A35MC-TF-G is a kind of linear voltage regulator released by Semtech. It belongs to PMIC – Voltage Regulators – Linear category. It is an advanced low dropout (LDO) linear voltage regulator and it is designed to offer very low quiescent current, high accuracy and high PSRR in the ultra-small SOT-23-5 package.

Application field

S-L2980A35MC-TF-G is heavily used in various kinds of industrial area. It is ideal for supplying high accuracy and low current consumption in various kinds of application like cellular base station, cellular hand held equipment, portable media player and other high fidelity low power systems. S-L2980A35MC-TF-G is also broadly used in high performance visible light communication (VLC) systems; the optical receiver can benefit from having the 3.3V supply regulated.It is also extensively used in remote wireless systems like industrial, automotive, and medical applications. Thanks to the excellent PSRR, the regulators can reject the high frequency interference thus their supply will be very clean. Moreover, its small compact size, low operating current and high output voltage accuracy make it especially suitable for applications that require very small size, low power consumption and high performance.

Working Principle

S-L2980A35MC-TF-G is a voltage reference based on low dropout linear regulator. It can provide very low quiescent current and stable output voltage with high accuracy. The core element of the regulator chip is a voltage reference which is driven by an internal bandgap voltage reference. The output voltage is regulated by controlling the base-emitter voltage of the NPN pass transistor. The output voltage is determined by the internal reference voltage, the gain of the pass transistor, and the external resistor network connected to the REF pin. The reference voltage and pass transistor gain is determined by design, but the value of the output voltage is determined by the output resistor network connected to the REF pin.The control circuit inside S-L2920A35MC-TF-G senses the output voltage and compares it with the internal reference voltage. If the output voltage is too high, the control circuit reduces the base-emitter voltage of the pass transistor, thus reducing the output voltage. On the other hand,when the output voltage is too low, the control circuit increases the base-emitter voltage of the pass transistor, thus increasing the output voltage.The high PSRR of S-L2920A35MC-TF-G is the result of a higher feedback frequency. When the input supply voltage is noisy, the control circuit compensates for the ripple voltage on the input supply by increasing or decreasing the pass transistor\'s base-emitter voltage as needed. This helps to maintain a steady output voltage even under noisy conditions.

Conclusion

S-L2980A35MC-TF-G is an advanced low dropout linear voltage regulator from Semtech, designed to offer very low quiescent current, high accuracy and high PSRR in the ultra-small SOT-23-5 package. It is widely used in various kinds of industrial application, like cellular base station, cellular hand held equipment, portable media player and other high fidelity low power systems. More importantly, its core element is a voltage reference based on low dropout linear regulator, by controlling the base-emitter voltage of the NPN pass transistor, and with special technology, it can provide excellent PSRR and steady output voltage even under noisy conditions.

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