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WL2820D28-4
Public Made by Adomby 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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownWL2820D28-4
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);wl2820d28-4.step/wl2820d28-4.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).