LT3045 datasheet(29/62 Pages) AD

29 / 62 page

Data Sheet

LT3074

analog.com

Rev 0.

29 of 62

APPLICATIONS INFORMATION

The LT3074 is a low voltage, ultralow noise, and ultrafast transient response linear regulator. The device supplies up

to 3A with a typical dropout voltage of 45mV. A 4.7µF reference bypass capacitor (placed at the SETCAP pin)

decreases output voltage noise to 1.2μVRMS. The LDO’s wide bandwidth and high power supply rejection ratio (PSRR)

permit the use of small ceramic capacitors, saving bulk capacitance and cost. The LT3074 is ideal for high-

performance field programmable gate arrays (FPGAs), microprocessors, radio frequency (RF) communication, and

noise-sensitive supply applications.

Designed as a precision current source followed by a high-performance unity gain amplifier, the LT3074 can be easily

paralleled to further reduce noise, increase output current, and spread heat on the PCB. The LT3074 also

incorporates a VIOC tracking function to control an upstream switching converter to maintain constant voltage

across the LT3074’s power device, thus minimizing power dissipation. The LT3074 additionally features

programmable current limit, fast start-up capability, and programmable power good.

The LT3074 supports PMBus compliant serial interface for control, telemetry, and fault reporting that can operate at

any frequency between 10kHz and 400kHz. The serial interface supports the send byte, read byte, write byte, read

word, write word, and read block communication protocols, as defined in the PMBus specification. Table 6 gives a

list of all PMBus commands supported by the LT3074. Table 7 gives a description of the data formats.

Table 6. Supported PMBus Commands

COMMAND (CMD)

NAME

CMD

CODE

DESCRIPTION

TYPE

DATA

FORMAT

DEFAULT

VALUE

PAGE

0x00

Provides integration with multipage

PMBus devices

R/W Byte

Reg

0xFF

OPERATION

0x01

Operating mode control. On/off,

margin high and margin low

R/W Byte

Reg

0x84

ON_OFF_CONFIG

0x02

PMBus on/off command configuration

R/W Byte

Reg

0x1F

CLEAR_FAULTS

0x03

Clears any fault bits that are set

Send Byte

0x00

WRITE_PROTECT

0x10

Level of protection provided by the

device against accidental writes to

registers

R/W Byte

Reg

0x00

CAPABILITY

0x19

Summary of PMBus optional

communication protocols supported

by the device

R Byte

Reg

0xB0

VOUT_MODE

0x20

Output voltage format and exponent

(2−13)

R Byte

Reg

0x13

VOUT_OV_WARN_LIMIT

0x42

Output overvoltage warning limit

R/W Word

L16

0xA000

(5)

VOUT_UV_WARN_LIMIT

0x43

Output undervoltage warning limit

R/W Word

L16

0x0000

IOUT_OC_FAULT_LIMIT

0x46

Output current limit

R/W Word

L11

0xC34D

(3.3)

IOUT_OC_FAULT_RESP

ONSE

0x47

Action taken by the device in the event

of a current limit fault

R Byte

Reg

0x00

OT_WARN_LIMIT

0x51

Overtemperature warning limit

R/W Word

L11

0xF258

(150)

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