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MD57E29QC3

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Shanghai Mingda Microelectronics Linear Voltage Regulators (LDO), SOT-23-5L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MD57E29QC3

Shanghai Mingda Microelectronics · Linear Voltage Regulators (LDO) · SOT-23-5L

MD57E29QC3 from Shanghai Mingda Microelectronics, in a SOT-23-5L. 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 Input supply pin, operating range 2.2 V to 5.5 V (absolute maximum 6.0 V), requires at least a 1.0 µF input capacitor.
2 GND power_in Ground pin for the regulator.
3 EN input Enable input, internally pulled low by 1 MΩ; above 0.85 V enables the device, below 0.35 V disables it and activates the 240 Ω output auto-discharge.
4 NC unconnected No internal connection.
5 VOUT power_out Regulated 2.9 V output (MD57E29QC3) delivering up to 300 mA, requires at least a 1.0 µF output capacitor which may be placed up to 10 cm away.

Key specifications

Parameter Value
Manufacturer Shanghai Mingda Microelectronics
Package SOT-23-5L
Category Power Supply Chip
Pins 5

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(S) 0.98 1.02 xVOUT(S) VIN=VOUT(S)+1.0V, IOUT=1mA, VOUT(S)≥2.0V 4
Line Regulation 0.02 0.1 %/V VOUT(S)+1.0V≤VIN=VEN≤5.5V, IOUT=10mA 4
Load Regulation VOUT2 10 20 mV VIN=VEN=VOUT(S)+1.0V, 1mA≤IOUT≤300mA 4
GND Current, no load IGND 20 40 µA VEN=VIN, no load 4
Shutdown Current ISHUT 0.01 0.1 µA VIN=5.5V, VEN=0 4
Input Voltage VIN 2.2 5.5 V 4
Maximum Output Current IOUTMAX 250 300 mA 4
Start-Up Time TSTART 80 150 µs From VEN>VENH to VOUT=95% of VOUT 4
EN 'H' Level Voltage VENH 0.85 5.5 V 4
EN 'L' Level Voltage VENL 0 0.35 V 4
EN 'H' Level Current IENH -0.1 0.1 µA VIN=5.5V, VEN=VIN 4
EN 'L' Level Current IENL -0.1 0.1 µA VIN=5.5V, VEN=0 4
Input Voltage (absolute maximum) VIN -0.3 6 V Ta=25℃ 3
Output Voltage (absolute maximum) VOUT -0.3 V -0.3 ~ VIN+0.3V 3
Power Dissipation SOT-23-5L PD 250 mW SOT-23-5L 3
Operating Ambient Temperature Topr -40 85 ℃ 3
Storage Temperature Tstg -40 125 ℃ 3
ESD Protection HBM ESD 6000 V HBM 3
Thermal Resistance SOT-23-5L RθJA 180 ℃/W SOT-23-5L 3
Input Capacitor CIN 1 µF 1.0µF above 3
Output Capacitor COUT 1 µF 1.0µF above 3
Operating Junction Temperature TJ -40 125 °C 1
Dropout Voltage VDROP 130 mV VEN=VIN, VOUT<3V, IOUT=300mA 4
Line Transient VOUT_Line -1 mV VIN= VOUT+1V to VOUT+2V in 30us 4
Line Transient VOUT_Line 1 mV VIN= VOUT+2V to VOUT+1V in 30us 4
Load Transient VOUT_Load -40 mV IOUT=1mA to 300mA in 10µs 4
Load Transient VOUT_Load 40 mV IOUT=300mA to 1mA in 10µs 4
Temperature Stability 100 ppm/℃ VIN=VEN=VOUT(S)+1.0V, IOUT=1mA, -40℃≤Ta≤125℃, printed ±100 4
GND Current at 300mA IGND 470 µA VEN=VIN, IOUT=300mA 4
Current Limit ILIM 500 mA VIN=VEN=VOUT(S)+1.0V, VOUT = 0.95 ×VOUT(S) 4
COUT Auto Discharge RDCHG 240 Ω VEN=0, VOUT=VOUT(S) 4
PSRR PSRR 94 dB f=1kHz, IOUT=20mA 4
PSRR PSRR 72 dB f=10kHz, IOUT=20mA 4
PSRR PSRR 77 dB f=100kHz, IOUT=20mA 4
PSRR PSRR 53 dB f=1MHz, IOUT=20mA 4
Output noise voltage eN 20 µVRMS IOUT=20mA 4
Overshoot on Start-Up VOUT_Start-up 5 % Stated as a percentage of VOUT(S) 4
Over Temperature Protection OTP 155 ℃ IOUT=1mA 4

CAD (KiCad official)

  • Symbol: MD57E29QC3
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)
  • 3D model files: md57e29qc3-etched.step / md57e29qc3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md57e29qc3.step / md57e29qc3.glb are the bare package body.

Provenance

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

  • Datasheet: Shanghai Mingda Microelectronics datasheet (13 pp, sha256 da256fddd9468a88, retrieved 2026-10-23, tier: lcsc)
  • 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