Analog Devices Inc. LT3074 Dropout Linear Regulators

Analog Devices Inc. LT3074 Dropout Linear Regulators are low-voltage, low-noise, and ultrafast transient response regulators with a PMBus serial interface. These regulators are supported by the LTPowerPlay software development tool with a Graphical User Interface (GUI). The LT3074 regulators support PMBus-compliant serial interface for control, telemetry, and fault reporting that operate from 10kHz to 400kHz frequency range. These regulators source 100µA precision reference current to the SETRES pin. The LT3074 regulators incorporate a tracking feature (VIOC) to control the upstream switching regulator to maintain a constant voltage. These regulators supply up to 3A with a typical dropout voltage of 45mV. The LT3074 regulators feature programmable current limits, fast start-up capability, and programmable power good.

The LT3074 regulators are designed as a precision current source followed by a high-performance unity gain amplifier. These regulators can be parallel to reduce noise, improve output current, and spread heat on the PCB. The LT3074 regulators are available in a 22-lead (3mm x 4mm) LQFN package. These regulators are used in low-noise instrumentation, high-precision data converters, RF power supplies, and medical applications.

Features

1.2µV_RMS (10Hz to 100kHz) ultralow RMS noise
3.5nV/√Hz at 10kHz ultralow spot noise
7µV_P-P (0.1Hz to 10Hz) ultralow 1/f noise
52dB at 1MHz high PSRR at high frequency
Stable with ceramic output capacitors (10μF minimum)
Parallel multiple devices for higher current
Ultrafast transient response
45mV typical dropout voltage
Available in a 22 lead (3mm x 4mm) LQFN package (laminate package with QFN footprint)

PMBus capability:
- V_OUT, I_OUT, V_IN, V_BIAS, and temperature reporting
- V_OUT margining
- I_OUT overcurrent and undercurrent warn limits
- V_OUT, V_IN, and V_BIAS undervoltage and overvoltage warn limits
- Overtemperature warn limit
VIOC pin to control upstream switching converter