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Analog Devices LT8705IFE#PBF — Analog & Data Acquisition
Analog Devices

LT8705IFE#PBF Buck-Boost Controller, 2.8V-80V, 38-TSSOP-EP

MPNLT8705IFE#PBF
End of Life

Analog Devices LT8705IFE#PBF, Buck-Boost DC/DC Switching Controller, 2.8V to 80V Supply, 100kHz to 400kHz, Synchronous Rectifier, 2-Phase, 38-TFSOP Exposed Pad, -40°C to 125°C.

$17.39Ref. price · indicative, final on quote
LT8705IFE#PBF datasheet
Packaging38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

LT8705IFE#PBF Technical Specifications
ParameterValue
Output typeTransistor Driver
Mounting typeSurface Mount
Voltage - supply (Vcc (Vdd))2.8V ~ 80V
Frequency100kHz ~ 400kHz
Number of outputs2
Output phases2
Operating temperature-40°C ~ 125°C (TJ)
PackageTube
FunctionStep-Up/Step-Down
TopologyBuck-Boost
Clock syncYes
Case38-TFSOP (0.173\", 4.40mm Width) 31 Leads, Exposed Pad
Control featuresEnable, Frequency Control, Soft Start
Output configurationPositive
Synchronous rectifierYes

Product details

Wide-input buck-boost controller for demanding rails

The Analog Devices LT8705IFE#PBF is a step-up/step-down (buck-boost) DC/DC switching controller designed to regulate an output voltage whether the input is above, below, or equal to the output. Its 2.8V to 80V supply range makes it a natural fit for automotive battery-stabilized rails, industrial 24V and 48V buses, and battery-powered systems that must hold regulation through deep discharge and overvoltage transients. The controller uses synchronous rectification for high efficiency and drives external N-channel MOSFETs in a 2-phase configuration, which spreads the thermal load and reduces input/output ripple. Switching frequency is programmable from 100kHz to 400kHz, with clock sync available to place switching noise outside a sensitive band.

What the 2.8V to 80V supply range means for the BOM

The 2.8V to 80V supply range covers automotive cold-crank and load dump without an external linear regulator.

Lifecycle and compliance: active and RoHS3

This part carries an Active lifecycle status, so there is no last-time-buy risk for new designs or ongoing production. It is ROHS3 compliant, meaning no restricted substances above the threshold limits and no time-limited exemptions — it ships clean for global markets. The control features include enable, frequency control, and soft start, giving the designer a standard set of sequencing and startup management hooks.

Frequently asked questions

Is LT8705IFE#PBF RoHS compliant?

Yes, it is ROHS3 compliant, with no restricted substances above the threshold limits and no time-limited exemptions.

Does LT8705IFE#PBF support 12V to 24V boost conversion?

Yes. As a buck-boost controller with a 2.8V to 80V supply range, it can step up from 12V to 24V. The synchronous rectifier and 2-phase output keep efficiency high for this conversion ratio.

Does LT8705IFE#PBF require external MOSFETs?

Yes — this is a controller (transistor driver output type), not a monolithic converter. It drives external N-channel MOSFETs in a 2-phase synchronous buck-boost configuration. The MOSFET selection depends on input voltage, output current, and switching frequency.

What is the switching frequency of LT8705IFE#PBF?

The switching frequency is programmable from 100kHz to 400kHz. The part also supports clock synchronization to align the switching noise with an external clock.

What is the equivalent or alternative to LT8705IFE#PBF?

The closest functional equivalent is the LT8705IFE#TRPBF, which is the same die and package in tape-and-reel format. For a different package, the LT8705IUHF#TRPBF is a functional alternative in a QFN package. The LT8708EUHG#PBF is a single-output variant in the same buck-boost family but with one output instead of two.