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WL2820D28-4

Public Made by Adom

by adom

WILLSEMI Will Semicon Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, DFN1x1-4L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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WL2820D28-4

WILLSEMI Will Semicon · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · DFN1x1-4L

WL2820D28-4 from WILLSEMI Will Semicon, in a DFN1x1-4L. 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 VOUT output Regulated output of the LDO, with an absolute maximum range of -0.3 V to VIN and a programmed output of 1.0 V to 3.8 V.
2 GND power_in Ground reference pin for the regulator.
3 EN input Active-high enable input with an absolute maximum range of -0.3 V to VIN, requiring at least 1.2 V to turn on and 0.4 V or less to turn off.
4 VIN power_in Input supply pin with a recommended operating range of 2.2 V to 5.5 V and an absolute maximum of 6.5 V.
5 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer WILLSEMI Will Semicon
Package DFN1x1-4L
Category Power Management (PMIC)
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>1.5V row, applies to 2.8V variant) VOUT 0.98 1.02 x VOUT VOUT>1.5V, IOUT=1mA 4
Dropout Voltage VDROP 250 375 mV VOUT=2.8V, IOUT=300mA 4
Line Regulation ΔVLINE 0.01 0.1 %/V VIN=2.7~5.5V, IOUT=1mA 4
Load Regulation ΔVLoad 10 30 mV VOUT=2.8V , IOUT=1~300mA 4
Quiescent Current IQ 42 70 μA VOUT=2.8V, IOUT=0 4
Current Limit ILIM 300 mA VEN=VIN 4
Short Current ISHORT 80 mA VEN=VIN, VOUT Short to GND with 1Ω 4
Shut-down Current ISHDN 1 μA VEN=0V 4
Power Supply Rejection Rate at 217Hz PSRR 70 dB VIN=(VOUT+1V)DC+0.5VP-P F=217Hz ,Iout=10mA 4
Power Supply Rejection Rate at 10kHz PSRR 60 dB VIN=(VOUT+1V)DC+0.5VP-P F=10KHz, Iout=10mA 4
EN logic high voltage VENH 1.2 V VIN=5.5V, IOUT=1mA 4
EN logic low voltage VENL 0.4 V VIN=5.5V, VOUT=0V 4
EN Input Current IEN 1 μA VEN= 0 to 5.5V 4
Output Noise Voltage eNO 55 μVRMS 10Hz to 100KHz, COUT=1μF 4
Thermal shutdown threshold TSD 165 °C 4
Thermal shutdown hysteresis ΔTSD 30 °C 4
Auto-discharge Nch Tr. ON Resistance RLOW 100 Ω VIN=4.0V，VCE=0V 4
Power Dissipation PD 400 mW TA=25℃ 3
VIN Range VIN -0.3 6.5 V 3
VEN Range VEN -0.3 V 3
VOUT Range VOUT -0.3 V 3
Output Current IOUT 400 mA 3
Lead Temperature Range 260 °C 3
Storage Temperature Range -55 150 °C 3
Operating Junction Temperature Range 150 °C 3
ESD HBM 8000 V HBM 3
ESD MM 400 V MM 3
Operating Supply Voltage VIN 2.2 5.5 V 3
Operating Temperature Range -40 85 °C 3
Thermal Resistance, junction to ambient RθJA 250 °C/W 3

CAD (KiCad official)

  • Symbol: WL2820D28-4
  • Footprint: Package_DFN_QFN:UDFN-4-1EP_1x1mm_P0.65mm_EP0.48x0.48mm
  • 3D model: DFN1x1-4L (KiCad packages3D, STEP)
  • 3D model files: wl2820d28-4-etched.step / wl2820d28-4-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); wl2820d28-4.step / wl2820d28-4.glb are the bare package body.

Provenance

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

  • Datasheet: WILLSEMI Will Semicon datasheet (10 pp, sha256 fc207c8313b891fa, retrieved 2026-10-18, 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