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Analog Devices’ Ultra-low-noise LDOs Optimise Load Performance In Communications, Medical and Industrial Systems

18th November 2011

Analog Devices

ES Admin

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Devices has introduced a pair of LDOs (low dropout regulators) with low noise, high power supply rejection, and excellent line and load transient response. The ADP7102 and ADP7104 LDOs achieve a 15 μVrms fixed-voltage noise figure, power supply rejection ratio (PSRR) of 60 dB at 10 kHz in 3-V operation, and feature reverse current protection to guard against shorts and sudden load discharges. The new LDOs are designed to maximise the load performance and yield higher data conversion accuracy and resolution in high-frequency communications infrastructure, medical imaging, and industrial and instrumentation applications.

“ADI’s newest LDOs are specially designed for noise-sensitive, high-performance loads typical of A/D and D/A converters, DSPs, FPGAs, precision amplifiers, high-frequency clocks, oscillators and PLL circuits,” said Laurence McGarry, marketing manager, Power Management Products Group, Analog Devices. “This improved load performance can enable higher converter frequency and accuracy, which in a medical ultrasound system, for example, can mean high image resolution.”

The new LDOs operate from 3.3 V to 20 V and are designed to regulate high-performance analog and mixed-signal circuits operating from 19 V to 1.22 V rails while achieving excellent line and load
transient response with just a small 1-μF ceramic output. The ADP7102 has a maximum output current of 500 mA, while the maximum output current of the ADP7104 is 300 mA. Both LDOs are available in an 8-lead SOIC-EP and a space saving 3-mm x 3-mm LFCSP package that provides excellent thermal performance for applications requiring up to 300 mA of output current in a small, low-profile footprint.

ADP7102 and ADP7104 LDO Key Features
• Input voltage range: 3.3 V to 20 V
• Maximum output current:
o ADP7102 = 300 mA
o ADP7104 = 500 mA
• Low Noise: 15 μVRMS for fixed output versions
• PSRR = 60 dB @ 10 kHz at VOUT = 3.3 V
• Reverse current protection
• Low dropout voltage:
o ADP7102 = 200 mV at 300 mA load
o ADP7104 = 280 mV @ 500 mA load
• Stable with small 1-μF ceramic output capacitor
• 7 fixed output voltage options: 1.5, 1.8, 2.5, 3, 3.3, 5, 9 V