LT3074AVPBF datasheet(1/62 Pages) AD

部件名	LT3074AVPBF

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

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Data Sheet

LT3074

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

Rev.0

DOCUMENT FEEDBACK

TECHNICAL SUPPORT

One Analog Wa y, Wilmington, MA 01887 -2356, U.S.A.

Tel: 781.329.47 00

FEATURES



Ultralow RMS Noise: 1.2µVRMS (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:



VOUT, IOUT, VIN, VBIAS, and Temperature Reporting



VOUT Margining



IOUT Overcurrent and Undercurrent Warn Limits



VOUT, VIN, and VBIAS 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

APPLICATIONS



RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs



High Speed/High Precision Data Converters



Low Noise Instrumentation



Post-Regulator for Switching Supplies



FPGA and DSP Power Supplies



Medical Applications

GENERAL DESCRIPTION

The LT3074 is a low voltage, ultralow noise, and ultrafast

transient response linear regulator with a PMBus serial

interface. The device supplies up to 3A with a typical

dropout voltage of 45mV. A 4.7µF reference bypass

capacitor decreases output voltage noise to 1.2μVRMS.

The wide bandwidth and high PSRR permit the use of

small ceramic capacitors, saving bulk capacitance and

cost. The LT3074 is supported by the LTPowerPlay

software development tool with a graphical user

interface (GUI).

The LT3074 sources a 100µA precision reference current

to the LT3074’s SETRES pin. Placing a resistor from this

SETRES pin to GND sets the output voltage. The

LT3074’s unity-gain operation provides virtually

constant output noise, PSRR, bandwidth and load

regulation, independent of the programmed output

voltage. Additionally, the LT3074 incorporates a unique

tracking feature (VIOC) to control the upstream

switching regulator to maintain a constant voltage

across the LT3074, and hence minimize power

dissipation.

The PMBus control allows to set the output current limit

from 1A to 6.4A in discrete steps of 0.05A. The PMBus

Telemetry feature provides information regarding the

output voltage and current, input voltage, bias voltage

and die temperature. The LT3074 features a CLKDIS pin

to control the internal clock. Pulling this pin to BIAS

disables the internal clocks to put LT3074 in the “quiet

mode”. The LT3074 is available in a compact 22 lead

(3mm × 4mm) LQFN package (laminate package with

QFN footprint).

SIMPLIFIED APPLICATION DIAGRAM

Figure 1. Simplified Application Diagram

Figure 2. Transient Response

10µF

0.47µF

MPWR

51kΩ

69.8kΩ

261kΩ

10kΩ

2.2µF

383kΩ

147kΩ

LT3074

BIAS

BIASDF

IN

OUT

SENSE

SETCAP

IMON

SDA

SCL

ALERT

ASEL

AGND

EN

VBIAS

2.375V TO 5.5V

VBIAS ≥ VOUT + 1.2V

VIN

VOUT + 0.1V TO 5.5V

VOUT

1.2V

10mA TO 3A

VIOC

PG

CLKDIS

POWER GOOD

SETRES

BIASAF

DGND

PGFB

22µF

4.7µF

12kΩ

COUT = 10µF

IOUT = 300mA TO 3A

3A/µs SLEW RATE

VOUT(NOMINAL) = 1V

VIN = 1.3V

VBIAS = 3.3V

5µs/DIV

IOUT

2A/DIV

VOUT

AC-COUPLED

20mV/DIV

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