component
LKP2872ST-ADJ
Public Made by Adomby adom
LKWIC Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
LKP2872ST-ADJ
LKWIC · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5
LKP2872ST-ADJ from LKWIC, in a SOT-23-5. 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 | IN | power_in | Input supply pin (1.8V to 15V recommended operating, ±18V absolute maximum); a 1μF to 10μF ceramic capacitor to GND is recommended. |
| 2 | GND | power_in | Ground pin. |
| 3 | SHDN# | input | Output shutdown pin that must be connected to IN, and the device will not operate if this pin is left floating. |
| 4 | ADJ | input | Adjustable output voltage feedback pin on the ADJ version with a 1.22V reference, set by an R1 resistor to GND and an R2 resistor to OUT (R1 below 250kΩ, ±7V absolute maximum). |
| 5 | OUT | power_out | Regulated output pin (100mA maximum) that needs a ceramic or tantalum capacitor of at least 1μF to GND. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LKWIC |
| Package | SOT-23-5 |
| 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 |
|---|---|---|---|---|---|---|---|
| Minimum input voltage | 1.8 | 2.3 | V | ILOAD = 100mA | 6 | ||
| ADJ output voltage | 1.17 | 1.22 | 1.26 | V | LKP2872ST-ADJ, 2.3V < VIN < 18V, 1mA < ILOAD < 100mA | 6 | |
| Line regulation (ADJ) | 1 | 10 | mV | LKP2872ST-ADJ, ILOAD = 1mA | 6 | ||
| Load regulation (ADJ) | 1 | 50 | mV | LKP2872ST-ADJ, VIN = 2.3V, ΔILOAD = 1mA～100mA | 6 | ||
| Dropout voltage | 0.1 | 0.19 | V | ILOAD = 1mA | 6 | ||
| Dropout voltage | 0.17 | 0.29 | V | ILOAD = 10mA | 6 | ||
| Dropout voltage | 0.24 | 0.38 | V | ILOAD = 50mA | 6 | ||
| Dropout voltage | 0.3 | 0.45 | V | ILOAD = 100mA | 6 | ||
| GND pin current | 20 | 45 | μA | ILOAD = 0mA | 6 | ||
| GND pin current | 55 | 100 | μA | ILOAD = 1mA | 6 | ||
| GND pin current | 230 | 400 | μA | ILOAD = 10mA | 6 | ||
| GND pin current | 1 | 2 | mA | ILOAD = 50mA | 6 | ||
| GND pin current | 2.2 | 4 | mA | ILOAD = 100mA | 6 | ||
| Ripple rejection | 55 | 65 | dB | VIN, VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 50mA | 6 | ||
| Current limit | 110 | mA | VIN = VOUT(NOMINAL) + 1V or 2.3V, ΔVOUT = -5% | 6 | |||
| Reverse input leakage current | 1 | mA | VIN = -12V, VOUT = 0V | 6 | |||
| Reverse output current (ADJ) | 5 | 10 | μA | LKP2872ST-ADJ, VOUT = 1.22V, VIN < 1.22V | 7 | ||
| Input voltage (IN/SHDN# pins) | VIN | 18 | V | 5 | |||
| BYP pin voltage | 0.6 | V | 5 | ||||
| ADJ pin voltage | 7 | V | 5 | ||||
| Output voltage (OUT pin) | VOUT | 18 | V | 5 | |||
| Storage temperature | TSTG | -65 | 150 | ℃ | 5 | ||
| Junction temperature | Tj | 150 | ℃ | 5 | |||
| Input voltage (IN pin) | VIN | 1.8 | 15 | V | 5 | ||
| Operating temperature | TA | -40 | 125 | ℃ | 5 | ||
| Recommended minimum output capacitance | 10 | μF | Output capacitor, ESR 3Ω or lower, to prevent oscillation | 8 | |||
| Output capacitor ESR | 3 | Ω | Recommended minimum output capacitance 10μF | 8 | |||
| Junction-to-ambient thermal resistance (SOT-23) | RθJA | 125 | 150 | °C/W | Range depends on copper area; stated in application text, not in thermal table | 9 | |
| Junction-to-case thermal resistance (top) | RθJc | 50.18 | °C/W | 5 | |||
| Junction-to-case thermal resistance (bottom) | RθJc | 178.92 | °C/W | 5 | |||
| Output voltage noise | 20 | μVRMS | COUT = 10μF, CBYP = 0.01μF, ILOAD = 100mA, BW = 10Hz～100kHz | 6 | |||
| Current limit | 200 | mA | VIN = 7V, VOUT = 0V | 6 |
CAD (KiCad official)
- Symbol:
LKP2872ST-ADJ - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
lkp2872st-adj-etched.step/lkp2872st-adj-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lkp2872st-adj.step/lkp2872st-adj.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LKWIC datasheet (11 pp, sha256
36bd3ee8b7e961db, retrieved 2026-10-17, 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).
# LKP2872ST-ADJ
**LKWIC** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5
LKP2872ST-ADJ from LKWIC, in a SOT-23-5. 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 | IN | power_in | Input supply pin (1.8V to 15V recommended operating, ±18V absolute maximum); a 1μF to 10μF ceramic capacitor to GND is recommended. |
| 2 | GND | power_in | Ground pin. |
| 3 | SHDN# | input | Output shutdown pin that must be connected to IN, and the device will not operate if this pin is left floating. |
| 4 | ADJ | input | Adjustable output voltage feedback pin on the ADJ version with a 1.22V reference, set by an R1 resistor to GND and an R2 resistor to OUT (R1 below 250kΩ, ±7V absolute maximum). |
| 5 | OUT | power_out | Regulated output pin (100mA maximum) that needs a ceramic or tantalum capacitor of at least 1μF to GND. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LKWIC |
| Package | SOT-23-5 |
| 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 |
|---|---|---|---|---|---|---|---|
| Minimum input voltage | | | 1.8 | 2.3 | V | ILOAD = 100mA | 6 |
| ADJ output voltage | | 1.17 | 1.22 | 1.26 | V | LKP2872ST-ADJ, 2.3V < VIN < 18V, 1mA < ILOAD < 100mA | 6 |
| Line regulation (ADJ) | | | 1 | 10 | mV | LKP2872ST-ADJ, ILOAD = 1mA | 6 |
| Load regulation (ADJ) | | | 1 | 50 | mV | LKP2872ST-ADJ, VIN = 2.3V, ΔILOAD = 1mA～100mA | 6 |
| Dropout voltage | | | 0.1 | 0.19 | V | ILOAD = 1mA | 6 |
| Dropout voltage | | | 0.17 | 0.29 | V | ILOAD = 10mA | 6 |
| Dropout voltage | | | 0.24 | 0.38 | V | ILOAD = 50mA | 6 |
| Dropout voltage | | | 0.3 | 0.45 | V | ILOAD = 100mA | 6 |
| GND pin current | | | 20 | 45 | μA | ILOAD = 0mA | 6 |
| GND pin current | | | 55 | 100 | μA | ILOAD = 1mA | 6 |
| GND pin current | | | 230 | 400 | μA | ILOAD = 10mA | 6 |
| GND pin current | | | 1 | 2 | mA | ILOAD = 50mA | 6 |
| GND pin current | | | 2.2 | 4 | mA | ILOAD = 100mA | 6 |
| Ripple rejection | | 55 | 65 | | dB | VIN, VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 50mA | 6 |
| Current limit | | 110 | | | mA | VIN = VOUT(NOMINAL) + 1V or 2.3V, ΔVOUT = -5% | 6 |
| Reverse input leakage current | | | | 1 | mA | VIN = -12V, VOUT = 0V | 6 |
| Reverse output current (ADJ) | | | 5 | 10 | μA | LKP2872ST-ADJ, VOUT = 1.22V, VIN < 1.22V | 7 |
| Input voltage (IN/SHDN# pins) | VIN | | | 18 | V | | 5 |
| BYP pin voltage | | | | 0.6 | V | | 5 |
| ADJ pin voltage | | | | 7 | V | | 5 |
| Output voltage (OUT pin) | VOUT | | | 18 | V | | 5 |
| Storage temperature | TSTG | -65 | | 150 | ℃ | | 5 |
| Junction temperature | Tj | | | 150 | ℃ | | 5 |
| Input voltage (IN pin) | VIN | 1.8 | | 15 | V | | 5 |
| Operating temperature | TA | -40 | | 125 | ℃ | | 5 |
| Recommended minimum output capacitance | | 10 | | | μF | Output capacitor, ESR 3Ω or lower, to prevent oscillation | 8 |
| Output capacitor ESR | | | | 3 | Ω | Recommended minimum output capacitance 10μF | 8 |
| Junction-to-ambient thermal resistance (SOT-23) | RθJA | 125 | | 150 | °C/W | Range depends on copper area; stated in application text, not in thermal table | 9 |
| Junction-to-case thermal resistance (top) | RθJc | | 50.18 | | °C/W | | 5 |
| Junction-to-case thermal resistance (bottom) | RθJc | | 178.92 | | °C/W | | 5 |
| Output voltage noise | | | 20 | | μVRMS | COUT = 10μF, CBYP = 0.01μF, ILOAD = 100mA, BW = 10Hz～100kHz | 6 |
| Current limit | | | 200 | | mA | VIN = 7V, VOUT = 0V | 6 |
## CAD (KiCad official)
- Symbol: `LKP2872ST-ADJ`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `lkp2872st-adj-etched.step` / `lkp2872st-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lkp2872st-adj.step` / `lkp2872st-adj.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [LKWIC datasheet](docs/lkp2872st-adj-datasheet.pdf) (11 pp, sha256 `36bd3ee8b7e961db`, retrieved 2026-10-17, 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+vision), consensus `claude-opus-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](docs/lkp2872st-adj-datasheet.pdf)