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lm5574mtx

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Texas Instruments DC-DC Converters, TSSOP-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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LM5574MTX

Texas Instruments · DC-DC Converters · TSSOP-16

LM5574MTX from Texas Instruments, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VCC power_out Output of the internal bias regulator. Vcc tracks Vin up to 9V; above 9V it is regulated to ~7V. Requires a 0.1µF-1µF ceramic decoupling capacitor. An external 7.5V-14V supply may be applied here to reduce internal power dissipation.
2 SD input Shutdown / UVLO input. VSD < 0.7V = low-power shutdown; 0.7V-1.225V = standby; > 1.225V = operational. A resistor divider from VIN sets a line-UVLO threshold; if left open a 5µA internal pull-up enables the regulator.
3 VIN power_in Input supply voltage. Nominal operating range 6V to 75V (absolute maximum 76V).
4 SYNC bidirectional Oscillator synchronization input/output. Can be driven by an external clock through an external pull-down device, or tied between multiple LM5574 devices to self-synchronize. Source impedance ~11kΩ, sink impedance ~110Ω, falling threshold 1.3V, min pulse 15ns.
5 COMP output Output of the internal transconductance error amplifier. Connect the loop-compensation network between this pin and FB. Sink/source capability ~3mA, unity-gain bandwidth ~3MHz.
6 FB input Feedback input to the internal error amplifier (inverting input). Regulation reference is 1.225V ±1.5%; bias current ~17nA.
7 RT input Oscillator frequency-set input. A single resistor from RT to AGND programs the switching frequency between 50kHz and 500kHz (e.g. RT = 32.4kΩ → ~200kHz; RT = 11kΩ → ~485kHz).
8 RAMP input Ramp-control signal for the emulated current-mode PWM. An external capacitor (50pF-2000pF) from RAMP to AGND sets the emulated ramp slope.
9 AGND power_in Analog ground. Internal reference for the regulator control functions; return for RT and RAMP timing components.
10 SS input Soft-start. An external capacitor and an internal 10µA current source set the rise time of the error-amp reference. Held low during standby, VCC UVLO, and thermal shutdown.
11 OUT input Output-voltage sense connection. Connect directly to the regulated output voltage rail; used by the diode current-sense/emulated-ramp circuitry.
12 PGND power_in Power ground. Low-side reference for the pre-charge (PRE) switch and for the internal IS current-sense resistor.
13 IS input Current-sense input for the external re-circulating (Schottky) diode. An internal 250mΩ sense resistor and sample/hold measure diode current near the end of the off-time, providing the DC level of the emulated current ramp.
14 SW output Switching node - source of the internal 75V/750mΩ N-channel buck MOSFET. Connect to the external Schottky recirculation diode and the buck inductor. Steady-state minimum rating -1.5V.
15 PRE output Pre-charge assist for the bootstrap capacitor. Open-drain output (Rds(on) ~70Ω) that turns on for ~250ns each cycle just before the buck-switch on-time; usually tied to SW to keep BST charged under very light load or when the output is pre-charged before enable.
16 BST power_in Bootstrap-capacitor input for the high-side gate drive. Connect a ~0.022µF ceramic capacitor between BST and SW; the cap is recharged from VCC through an internal diode during the buck-switch off-time. BOOST UVLO ~4V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TSSOP-16
Category PMIC
Pins 16

Ordering variants

  • LM5574MTX
  • LM5574MTX/NOPB
  • LM5574MTXMT/NOPB

CAD (KiCad official)

  • Symbol: LM5574MTX
  • Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
  • 3D model: TSSOP-16 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (None pp, sha256 63b06033630731ba, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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