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MD7544

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Shanghai Mingda Microelectronics Linear Voltage Regulators (LDO), SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MD7544

Shanghai Mingda Microelectronics · Linear Voltage Regulators (LDO) · SOT-89-3

MD7544 from Shanghai Mingda Microelectronics, in a SOT-89-3. 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 GND power_in Ground pin.
2 VDD power_in Power supply input pin; input voltage withstands up to 18V (absolute maximum VIN 18V) and VOUT must not exceed VIN+0.3V.
3 VOUT power_out Regulated 4.4V (±3%) output pin, up to 120mA with short-circuit current limited to about 100mA, requiring a 2.2µF or larger output capacitor to GND.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-89-3
Category Power Management ICs
Pins 3

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 VOUT 4.268 4.4 4.532 V VIN=6.4V, IOUT=10mA 3
Output current IOUT 120 mA VIN=6.4V 3
Dropout voltage Vdrop 5 35 mV IOUT=1mA / IOUT=10mA 3
Line regulation ΔVOUT/ΔVIN·VOUT 0.05 0.2 %/V 5.4V≤VIN≤18V, IOUT=1mA 3
Load regulation ΔVOUT2 60 100 mV VIN=6.4V, 1.0mA≤IOUT≤120mA 3
Output voltage temperature coefficient ΔVOUT/ΔTa·VOUT 50 100 ppm/℃ VIN=6.4V, IOUT=10mA, -40℃≤Ta≤85℃ 3
Quiescent current ISS 1.2 5 uA VIN=18V, no load 3
Input voltage Vmax 18 V 3
Output short-circuit current Ishort 100 mA Vout=0V 3
Input voltage VIN 18 V Ta=25℃ 2
Power dissipation SOT-89 PD 500 mW SOT-89 2
Operating ambient temperature Topr -40 85 ℃ 2
Storage temperature Tstg -40 125 ℃ 2
Input capacitor CIN 1 µF 1.0 µF or more 5
Output capacitor CL 2.2 µF 2.2 µF or more (tantalum); 10.0 µF or more (aluminum electrolytic) 5

CAD (KiCad official)

  • Symbol: MD7544
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: md7544-etched.step / md7544-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md7544.step / md7544.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (12 pp, sha256 2834e2700c8ad15c, retrieved 2026-10-26, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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