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Texas Instruments LM3477AMMX/NOPB — Analog & Data Acquisition

LM3477AMMX/NOPB Buck Controller, 500kHz, 93% Duty Cycle

MPNLM3477AMMX/NOPB
End of Life

Texas Instruments LM3477AMMX/NOPB, High Efficiency High-Side Buck Controller, Step-Down (Buck, Buck-Boost), 1 Output, Transistor Driver, 500kHz Switching, 93% Max Duty Cycle, 2.97V to 35V Supply, -40°C to 125°C, 8-VSSOP, Surface Mount, Active.

$1.22Ref. price · indicative, final on quote
Texas Instruments LM3477AMMX/NOPB datasheet (PDF)
Packaging8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM3477AMMX/NOPB 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

What this buck controller does

The Texas Instruments LM3477AMMX/NOPB is a high-efficiency, high-side N-channel MOSFET switching controller configured for step-down (buck) and buck-boost topologies. It drives an external transistor, giving you flexibility to size the power stage for your load. A single output delivers positive regulation, and the controller includes an Enable pin for on/off control. The maximum duty cycle of 93 % means the controller can maintain regulation even when the input voltage is only slightly above the output — handy for battery-powered systems where the input sags near the end of discharge. No synchronous rectifier is built in.

The LM3477AMMX/NOPB comes in an 8-VSSOP package (3.00 mm width, 0.118" pitch) for surface-mount assembly. The supplier device package is 8-VSSOP, which is the standard footprint for this controller family. The listing shows the shipping medium as Bulk — not Tape & Reel — so if your pick-and-place line expects reeled parts, confirm the packaging variant before ordering.

Frequently asked questions

What is the switching frequency of LM3477AMMX/NOPB?

The switching frequency is fixed at 500 kHz. This determines the inductor and output capacitor values — higher frequency means smaller magnetics but more switching loss.

What is the maximum duty cycle of LM3477AMMX/NOPB?

The maximum duty cycle is 93 %. That means the controller can keep the output regulated even when the input voltage is only about 7 % above the output voltage — important for low-dropout operation.

What package does LM3477AMMX/NOPB come in?

It comes in an 8-VSSOP surface-mount package (3.00 mm width, 0.118" pitch). The supplier device package is 8-VSSOP.

Is LM3477AMMX/NOPB RoHS compliant?

The NOPB suffix in the order code indicates a lead-free (RoHS-compliant) finish. No separate RoHS certificate is listed, but the suffix is the standard TI designation for RoHS compliance.