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LM2576R-3.3

Public Made by Adom

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HTC Korea TAEJIN Tech DC-DC Converters, TO-263-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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LM2576R-3.3

HTC Korea TAEJIN Tech · DC-DC Converters · TO-263-5

LM2576R-3.3 from HTC Korea TAEJIN Tech, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VIN power_in Positive input supply for the LM2576 step-down switching regulator; a suitable input bypass capacitor (Cin) must be present to minimize voltage transients and supply the regulator's switching currents. Operating supply voltage is up to 40 V, with an absolute maximum of 45 V.
2 VOUT power_out Emitter of the internal output switch with a typical saturation voltage VSAT of 1.5 V; PCB area connected to this pin should be kept to a minimum to reduce coupling to sensitive circuitry.
3 GND power_in Circuit ground pin; see the printed circuit board layout information in the datasheet.
4 FEEDBACK input Senses the regulated output voltage to close the feedback loop; on the fixed-output versions it is divided internally by R2/R1 and applied to the error amplifier's non-inverting input.
5 ON/OFF input Logic-level shutdown input with a typical threshold of 1.4 V: applying a voltage above this (up to +Vin) turns the regulator off, while a voltage below 1.4 V or an open pin leaves it on, with total input supply current dropping to about 80 uA in shutdown.
6 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer HTC Korea TAEJIN Tech
Package TO-263-5
Category Power Management (PMIC)
Pins 6

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output Voltage (Vin=12V, ILOAD=0.5A) Vout 3.234 3.3 3.366 V Vin = 12V, ILOAD=0.5A, TJ=25℃ 6
Output Voltage (6.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A) Vout 3.168 3.3 3.432 V 6.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A, TJ=25℃ 6
Output Voltage (6.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A) Vout 3.135 3.465 V 6.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A, TJ=-40℃~+125℃ 6
Oscillator Frequency FOSC 47 58 kHz TJ=0 to +125℃ 7
Oscillator Frequency FOSC 42 63 kHz TJ=-40 to +125℃ 7
Oscillator Frequency FOSC 52 kHz TJ=25℃ 7
Max Duty Cycle ("0") DC 94 98 % Note 5: feedback removed from output and connected to 0V 7
Current Limit (Peak Current) ICL 4.2 5.8 6.9 A TJ=25℃, Notes 3 and 4 7
Current Limit (Peak Current) ICL 3.5 7.5 A TJ=-40 to +125℃, Notes 3 and 4 7
Saturation Voltage (Iout=3.0A) VSAT 1.5 1.8 V TJ=25℃, Iout=3.0A (Note 4) 7
Saturation Voltage (Iout=3.0A) VSAT 2 V TJ=-40 to +125℃, Iout=3.0A (Note 4) 7
Output Leakage Current IL 0.8 50 mA TJ=25℃, Output = 0V (Notes 6 and 7) 7
Output Leakage Current IL 6 30 mA TJ=25℃, Output = -1.0V (Notes 6 and 7) 7
Quiescent Current IQ 5 9 mA TJ=25℃ (Note 6) 7
Quiescent Current IQ 11 mA TJ=-40 to +125℃ (Note 6) 7
Standby Quiescent Current ISTBY 80 200 µA ON/OFF Pin = 5.0V ("off"), TJ=25℃ 7
Standby Quiescent Current ISTBY 400 µA ON/OFF Pin = 5.0V ("off"), TJ=-40 to +125℃ 7
ON/OFF Pin Logic Input Level (high) VIH 2.2 1.4 V Vout=0V, TJ=25℃ 7
ON/OFF Pin Logic Input Level (high) VIH 2.4 V Vout=0V, TJ=-40 to +125℃ 7
ON/OFF Pin Logic Input Level (low) VIL 1.2 1 V Vout=Nominal Output Voltage, TJ=25℃ 7
ON/OFF Pin Logic Input Level (low) VIL 0.8 V Vout=Nominal Output Voltage, TJ=-40 to +125℃ 7
ON/OFF Pin Input Current (high, regulator OFF) IIH 15 30 µA ON/OFF Pin = 5.0V (Regulator OFF), TJ=25℃ 7
ON/OFF Pin Input Current (low, regulator ON) IIL 0 0.5 µA ON/OFF Pin = 0V (Regulator ON), TJ=25℃ 7
Maximum Supply Voltage Vin 45 V 5
On/Off Pin Input Voltage -0.3 V -0.3V ≤ V ≤ +Vin 5
Output Voltage to Ground (Steady-State) -1 V Steady-state 5
Storage Temperature Range TSTG -60 150 ℃ 5
Minimum ESD Rating (Human Body Model) 2 kV C=100 pF, R=1.5kΩ 5
Lead Temperature (Soldering, 10 seconds) 260 ℃ 10 seconds 5
Maximum Junction Temperature TJ 150 ℃ 5
Operating Junction Temperature Range TJ -40 125 ℃ 5
Supply Voltage Vin 40 V 5
Thermal Resistance, Junction to Ambient (TO-263 5-Lead) θJA 70 ℃/W TO-263 5-Lead 5
Thermal Resistance, Junction to Case (TO-263 5-Lead) θJC 5 ℃/W TO-263 5-Lead 5

CAD (KiCad official)

  • Symbol: LM2576R-3.3
  • Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
  • 3D model: TO-263-5 (KiCad packages3D, STEP)
  • 3D model files: lm2576r-3-3-etched.step / lm2576r-3-3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2576r-3-3.step / lm2576r-3-3.glb are the bare package body.

Provenance

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

  • Datasheet: HTC Korea TAEJIN Tech datasheet (11 pp, sha256 2acb3c8a94295de6, retrieved 2026-10-19, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF