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Analog Devices LT3080IST#PBF — Power Management (PMIC / Gate Driver)

LT3080IST#PBF adjustable LDO, 1.1A, SOT-223-3

MPNLT3080IST#PBF
End of Life

Analog Devices LT3080IST#PBF adjustable positive LDO, 1.1A output, 36V input max, SOT-223-3 (TO-261AA) surface-mount package, tube.

$6.33Ref. price · indicative, final on quote
PackagingTO-261-4, TO-261AA
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LT3080IST#PBF specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Voltage - input36V
Voltage dropout1.6V @ 1.1A
Voltage - output36V
Voltage - output (Min (Fixed))0V
Output current1.1A
Current - supply30 mA
Current - quiescent500 µA
Operating temperature-40°C ~ 125°C
PSRR75db ~ 20dB (120Hz ~ 1MHz)
PackageTube
CaseTO-261-4, TO-261AA
Protection featuresOver Current, Over Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

Package and board integration — SOT-223-3 footprint

The LT3080IST#PBF comes in a 3-pin SOT-223-3 surface-mount package (TO-261AA equivalent).

Output current and dropout — the real load ceiling

Rated for 1.1A continuous output with a maximum dropout of 1.6V at that load. The output is adjustable from 0V to 36V, matching the maximum input voltage.

PSRR profile — where it cleans and where it doesn't

PSRR starts at 75dB at 120Hz and rolls off to 20dB at 1MHz. This is typical for a 1.1A LDO — it rejects 120Hz rectifier ripple well, but above 100kHz the attenuation drops sharply. If the input comes from a switching regulator running at 500kHz or higher, expect only about 20dB of ripple rejection; a second-stage LC filter ahead of the LDO may be needed.

Protection and quiescent draw

Built-in overcurrent, overtemperature, and short-circuit protection cover the common fault modes. Quiescent current is 500 µA typical — moderate for this output class; not a candidate for always-on battery applications where every microamp counts, but fine for industrial rails where the load current dominates the power budget.

Frequently asked questions

What is the PSRR of LT3080IST#PBF?

PSRR is 75dB at 120Hz, rolling off to 20dB at 1MHz. This means it handles 120Hz rectifier ripple well but provides limited rejection above 100kHz.

What package does LT3080IST#PBF come in?

It is supplied in a 3-pin SOT-223-3 surface-mount package (also designated TO-261AA), shipped in tube format.

How does LT3080IST#PBF compare to LT3085EMS8E#TRPBF?

The LT3085EMS8E#TRPBF is a lower-current variant (0.5A) with a higher PSRR of 90dB at 120Hz. The LT3080IST#PBF delivers 1.1A but with 75dB PSRR at 120Hz. Both are adjustable positive LDOs with similar input voltage range and protection features. The LT3085 comes in an 8-lead MSOP package versus the 3-pin SOT-223-3 of the LT3080.