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Texas Instruments LM3477MM — Analog & Data Acquisition

LM3477MM Buck/Buck-Boost Controller, 500 kHz, 8-VSSOP

MPNLM3477MM
End of Life

Texas Instruments LM3477MM, Step-Down Buck/Buck-Boost Controller, 1 Output, Transistor Driver, 500 kHz, 2.97-35 V Supply, 8-VSSOP Package, -40 to 125°C.

$1.15Ref. price · indicative, final on quote
Texas Instruments LM3477MM datasheet (PDF)
Packaging8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
RoHSRoHS non-compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM3477MM specifications
ParameterValue
Output typeTransistor Driver
MountingSurface Mount
Voltage - supply (Vcc (Vdd))2.97V ~ 35V
Frequency - switching500kHz
I/O channels1
Output phases1
Duty cycle93%
Operating temperature-40°C ~ 125°C (TJ)
PackageBulk
FunctionStep-Down
TopologyBuck, Buck-Boost
Clock syncNo
Case8-TSSOP, 8-MSOP (0.118\", 3.00mm Width)
Control featuresEnable
Output configurationPositive
Synchronous rectifierNo

Product details

The Texas Instruments LM3477MM is a current-mode PWM controller designed for step-down (buck) and buck-boost topologies. It drives an external transistor switch, so the output current capability depends on the pass element you pair it with — the controller itself handles the control loop and gate drive. With a fixed 500 kHz switching frequency, inductor and capacitor values stay small, which helps when board space is tight. Supply voltage spans 2.97 V to 35 V.

Active part — no LTB risk

No last-time-buy notice, no end-of-life window to watch. RoHS non-compliant per the listing, so if your assembly line is RoHS-only, factor in an exemption or a lead-free alternative.

Frequently asked questions

What are the alternatives for LM3477MM?

A functional alternative is the LM5150QURUMRQ1, which is an automotive-grade boost controller with AEC-Q100 qualification and a higher switching frequency of 2.3 MHz. However, it is boost-only and cannot do buck or buck-boost like the LM3477MM. For a dual-output current-mode controller with synchronous rectification, consider the UCC2806DWTR, though it runs at 47 kHz and has a narrower temperature range.

Can LM3477MM be used in a buck-boost topology?

Yes, the LM3477MM supports both buck (step-down) and buck-boost topologies. The buck-boost configuration lets you generate a negative output voltage from a positive input, or regulate an output above or below the input rail — useful for inverting supplies and bias generators.