LT3078 Series

5.5V, 5A, Ultra-Low Noise, High PSRR, 55mV Dropout Ultra-Fast Linear Regulator

Catalog

5.5V, 5A, Ultra-Low Noise, High PSRR, 55mV Dropout Ultra-Fast Linear Regulator

Part	Number of Regulators	Voltage - Input (Max) [Max]	Output Configuration	Voltage - Output (Min/Fixed) [Min]	Current - Supply (Max) [Max]	Supplier Device Package	Current - Quiescent (Iq)	Current - Output	PSRR [Min]	PSRR [Max]	Output Type	Control Features	Package / Case	Operating Temperature [Min]	Operating Temperature [Max]	Protection Features	Voltage Dropout (Max) [Max]	Mounting Type
Analog Devices LT3078AV#PBF	1	5.5 V	Positive	0.5 V	7 mA	22-LQFN (3x4)	6.5 mA	5 A	70 dB	106 dB	Programmable	Current Limit Enable Power Good Soft Start	22-TFQFN Exposed Pad	-40 °C	125 ¯C	Over Current Over Temperature Under Voltage Lockout (UVLO)	0.14 V	Surface Mount
Analog Devices LT3078AV#TRPBF	1	5.5 V	Positive	0.5 V	7 mA	22-LQFN (3x4)	6.5 mA	5 A	106 dB	70 dB	Programmable	Current Limit Enable Power Good Soft Start	22-TFQFN Exposed Pad	-40 °C	125 ¯C	Over Current Over Temperature Under Voltage Lockout (UVLO)	0.14 V	Surface Mount

Catalog

5.5V, 5A, Ultra-Low Noise, High PSRR, 55mV Dropout Ultra-Fast Linear Regulator

Key Features

• Ultra-low RMS Noise: 1.3μVRMS (10Hz to 100kHz)

• Ultra-low Spot Noise: 3.5nV/√Hzat 10kHz

• Ultra-low 1/f Noise: 11μVP-P from 0.1Hz to 10Hz

• High PSRR at High-Frequency: 49dB at 1MHz

• Ultra-fast Transient Response

• Dropout Voltage: 55mV Typical

• Digitally Programmable VOUT: 0.5V to 4.2V

• High Accuracy: ±1.5% Over Line, Load, and Temperature

• Precise Current Monitor: ±3% accuracy at 5A

• Programmable Current Limit: ±3% at 5A

• Input Voltage Range: 0.6V to 5.5V

• Digital Output Margining: ±2.5%

• Stable with Ceramic Output Capacitors (22μF Minimum)

• Parallel Multiple Devices for Higher Current

• VIOC Pin to Control Upstream Switching Converter

• Precision Enable/Undervoltage Lockout (UVLO)

• Power Good (PG) Flag

• Internal Die Temperature Monitor

• 22-Lead (3mm x 4mm) LQFN Package

Description

The LT3078 is a low voltage, ultra-low noise, high power-supply rejection ratio (PSRR), and ultra-fast transient response linear regulator. The device supplies up to 5A with a typical dropout voltage of 55mV. A 4.7μF reference bypass capacitor decreases output voltage noise to 1.3μVRMS (10Hz to 100kHz). The wide bandwidth and high PSRR deliver the best performance without the need of bulky capacitors, which save space and cost. The LT3078 is ideal for powering high-performance FPGAs, data converters, RF, and all noise-sensitive signal chain applications.The output voltage is digitally selectable in 50mV increments from 0.5V to 1.2V, 100mV increments from 1.2V to 1.8V, and discrete levels at 2V, 2.5V, 3V, 3.3V, and 4.2V. The LT3078’s unity-gain operation provides virtually constant output noise, PSRR, and bandwidth independent of the programmed output voltage. In addition, the LT3078 incorporates a unique tracking feature (VIOC) to control the upstream switching regulator to maintain a constant voltage across the LT3078 and minimize power dissipation.A precision current monitor enables system energy management and allows the user to minimize input power-supply size and cost. Built-in protection includes UVLO, internal current limit, and thermal shutdown with hysteresis. The LT3078 is available in a compact 22-lead (3mm X 4mm) LQFN package (Laminate package with QFN footprint).APPLICATIONSRF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAsHigh Speed/High Precision Data ConvertersLow Noise InstrumentationPost-Regulator for Switching SuppliesFPGA and DSP Power SuppliesMedical Applications