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Texas Instruments LM2577SX-12/NOPB — Power Management (PMIC / Gate Driver)

LM2577SX-12/NOPB Obsolete — Texas Instruments SIMPLE

MPNLM2577SX-12/NOPB
Obsolete

Texas Instruments SIMPLE SWITCHER®, LM2577SX-12/NOPB, step-up/step-down regulator, fixed 12V output, 3A switch, 52kHz, D²Pak-5, -40°C to 125°C

$10.4100Ref. price · indicative, final on quote
Texas Instruments LM2577SX-12/NOPB datasheet (PDF)
Series*
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM2577SX-12/NOPB specifications
ParameterValue
SeriesSIMPLE SWITCHER®
Output typeFixed
MountingSurface Mount
Voltage - input3.5V
Voltage - output (Min (Fixed))12V
Output current3A (Switch)
Frequency52kHz
I/O channels1
Operating temperature-40°C~125°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionStep-Up, Step-Up/Step-Down
TopologyBoost, Flyback, Forward Converter
CaseTO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Output configurationPositive or Negative
Synchronous rectifierNo

Product details

Fixed 12V boost at 52 kHz — what the ratings mean

The LM2577SX-12/NOPB is a fixed 12 V output regulator from the SIMPLE SWITCHER® family, built around a 3 A internal switch rated for boost, flyback, and forward-converter topologies. Input range spans 3.5 V to 40 V, so it can ride a 12 V battery through cranking or a 24 V industrial rail with headroom. The 52 kHz switching frequency is low by modern standards — it keeps the inductor physically large but simplifies layout and reduces switching losses for a 3 A part.

Sourcing now runs through independent distribution.

Frequently asked questions

Is LM2577SX-12/NOPB obsolete?

No official last-time-buy or successor has been published. Sourcing is through independent distribution; we can quote against your BOM quantity.

Does LM2577SX-12/NOPB require external components?

Yes — like all non-module regulators, it needs an external inductor, diode, input/output capacitors, and feedback compensation. The SIMPLE SWITCHER® design tool and datasheet provide component selection guidelines.