Essential for Low-Noise Power Design: 5 Key Factors for Selecting the Right LDO

In noise-sensitive applications such as wireless base stations, RF amplifiers, medical devices, and industrial equipment, low-dropout linear regulators (LDOs) are crucial for filtering switching noise and external interference.

Richtek offers a wide range of low-noise industrial-graded LDOs with the following key features:

High Precision, Low Output Voltage：Richtek’s industrial-graded LDOs support an input voltage range from 1.1V to 6.5V, requiring only a single power input without additional power sources, simplifying system design. Some products provide an ultra-low output voltage down to 0.5V with high accuracy of ±1%.
Superior Noise Immunity：With high Power Supply Rejection Ratio (PSRR) of approximately 40dB at 500kHz and excellent noise immunity of 6.8 µVRMS, our industrial-graded LDOs effectively reduce noise interference.
Ultra-Low Dropout：Ultra-low dropout voltage reduces power consumption. For example, the RTQ2540H achieves a maximum dropout of just 145mV at 4A load, minimizing heat dissipation while improving efficiency, ideal for high-power applications.
Compact Packaging for Space-Constraint Designs：Richtek provides some LDOs housed in ultra-small WQFN 2.2mm × 2.5mm packages, optimized for high-density PCB layouts.
Flexible Design Options：Some LDOs feature an NR/SS pin for enhanced noise reduction via an external bypass capacitor. Additionally, our easy-out LDO series allows output voltage setting via pin strapping without resistors, ideal for I/O power and GPIO applications.

When selecting a low-noise LDO, key factors such as input/output range, PSRR, dropout voltage, packaging, and functionality must be considered. Richtek’s industrial-graded LDOs ensure reliable and stable power for diverse applications.

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▸ SMALL SIZE WITH EXTREMELY LOW DROPOUT VOLTAGE

Part Number	Iout (A)	Vin (V)	Vout (V)	RMS Noise (µV_RMS)	Typ. PSRR @ 500kHz (dB)	Max Dropout @ Full load (mV)	Package	Features
RTQ2538H	2	1.1~6.5	0.8~5.5	6.8	40	90	WQFN-12L-2.2x2.5	EN, SS, PG
RTQ2539A	3	1.1~6.5	0.8~5.5	6.8	40	130	WQFN-12L-2.2x2.5	EN, SS, PG
RTQ2540H	4	1.1~6.5	0.8~5.5	6.8	40	145	WQFN-12L-2.2x2.5	EN, SS, PG

▸ EASY-OUT BY PIN-STRAPPING

Part Number	Iout (A)	Vin (V)	Vout Adj. (V)	VOUT Range Easy-out (V)	RMS Noise (µV_RMS)	Typ. PSRR @ 500kHz (dB)	Max Dropout @ Full load (mV)	Package	Features
RTQ2532W	2	1.1~6.5	0.8~5.5	0.8~3.95	6.8	40	125	VQFN-20L-5x5	EN, SS, PG
RTQ2533W	3	1.1~6.5	0.8~5.5	0.8~3.95	6.8	40	180	VQFN-20L-3.5x3.5	EN, SS, PG
RTQ2537	4	1.1~6.5	0.8~5.5	0.8~3.95	6.8	40	240	VQFN-20L-3.5x3.5	EN, SS, PG

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Industrial Linear Regulators Small Cell Base Stations

Essential for Low-Noise Power: 5 Key Factors for Choosing an Ideal LDO

FEATURED PRODUCTS