LT3074

RECOMMENDED FOR NEW DESIGNS

5.5V, 3A Ultralow Noise, High PSRR, 45mV Dropout Linear Regulator with PMBus

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $5.94

Viewing:

Part Details

Ultralow RMS Noise: 1.2μV_RMS (10Hz to 100kHz)
Ultralow Spot Noise: 3.5nV/√Hz at 10kHz
Ultralow 1/f Noise: 7μVP-P (0.1Hz to 10Hz)
High PSRR at High Frequency: 52dB at 1MHz
Ultrafast Transient Response
Dropout Voltage: 45mV Typical
100μA Reference Current: ±0.5% Initial Accuracy
Precision Current Monitor: ±3% Accuracy at 3A
PMBus Capability Includes:

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

Stable with Ceramic Output Capacitors (10μF Minimum)
Parallel Multiple Devices for Higher Current
VIOC Pin to Control Upstream Switching Converter
22-Lead (3mm × 4mm) LQFN Package

Part Models: 2
1ku List Price: Starting From $5.94

Documentation

Data Sheet 1

LT3074: 5.5V, 3A Ultralow Noise, High PSRR, 45mV Dropout Linear Regulator with PMBus Data Sheet (Rev.0) 11/07/2024

User Guide 1

UG-2289: Evaluating the LT3074 3A, Ultralow Noise, High PSRR, 45mV Dropout Ultrafast Linear Regulator with PMBus (Rev.0) 11/07/2024

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3074AV#PBF	LGA/CASON/CH ARRY SO NO LD	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3074AV#TRPBF	LGA/CASON/CH ARRY SO NO LD	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Evaluation Kits

Evaluating the LT3074 3A, Ultralow Noise, High PSRR, 45mV Dropout Ultrafast Linear Regulator with PMBus

Buy Now View Details

Features and Benefits

Input voltage range: 0.6V to 5.5V
BIAS voltage range: 2.375V to 5.5V
Maximum output current: 3A
I²C/PMBus communication
Jumper selects bias mode of either external bias voltage or 3.3V internal logic power from the PMBus interface
Output voltage is precisely programmed to 1.20V by two 1%m resistors in series
BNC connectors for noise and PSRR measurement
Component placeholder can connect the PGFB pin directly to BIASAF to keep PG high
Operates standalone without PMBus programming
Jumper turns regulator on or off
Jumper enables or disables the internal clocks of LT3074 for noise performance verification

Jumper and resistor combinations select the serial bus interface address
Stacking connectors allow PMBus communication to multiple EVAL-LT3074-AZ
6-pin 0.1 inch pitch connector implements Pmod Type 6 I²C
LED indication of POWER ON, POWER GOOD and PMBus ALERT
Terminals provide output current and output regulation status monitoring
The VIOC pin of the LT3074 manages power dissipation and PSRR
Banana jacks minimize V_IN and V_OUT connection voltage drops
VO+, VO−, and VI+ terminals for regulation and dropout monitoring
Component footprint for an SMA connector that allows a shielded V_IN power connection
22-lead (3mm x 4mm) LQFN package

Product Details

The EVAL-LT3074-AZ evaluation board features the LT3074, a 3A, ultralow noise, high power-supply rejection ratio (PSRR), 45mV dropout ultrafast linear regulator with PMBus capability. The input voltage (V_IN) range for the V_IN power is from 0.6V to 5.5V. The maximum output current is 3A. The output voltage is precisely programmed to 1.20V by two 1% resistors in series. The EVAL-LT3074-AZ requires a BIAS voltage (V_BIAS) that is at least 1.2V higher than V_OUT and is between 2.375V and 5.5V. There is a jumper (JP4), which gives an option to connect the BIAS pin to either an external bias voltage or the internal 3.3V logic power from the PMBus interface (discussed later in this section). The EVAL-LT3074-AZ can operate standalone without PMBus programming.

The LT3074 of the EVAL-LT3074-AZ requires few external components. Therefore, it simplifies circuit design. The external component choice and careful printed circuit board (PCB) design help optimize noise, PSRR, load transient response, and V_OUT regulation performance. The LT3074 requires capacitors for the internal reference, power input, BIASAF pin, BIASDF pin, and the power output. The internal reference is bypassed with a 16V, 0805-sized, 4.7μF capacitor, which is placed at the SETCAP pin, to reduce output noise and program the soft-start. Larger capacitor case sizes and higher voltage ratings decrease 1/f noise for otherwise comparable capacitors. The 22μF capacitor at the circuit output is chosen for high-frequency PSRR performance and to minimize V_OUT deviation during load transients.

Please see the User Guide for the full description.