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LKP2872ST-18

Public Made by Adom

by 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.

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LKP2872ST-18

LKWIC · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5

LKP2872ST-18 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 (1.8V to 15V recommended, 18V absolute maximum); a 1µF to 10µF ceramic capacitor to GND is recommended.
2 GND power_in Ground.
3 SHDN# input Active-low output shutdown input that must be connected to IN, and the device will not operate if this pin is left floating.
4 BYP passive Bypass pin on the fixed-output LKP2872ST-18, where a 0.01µF ceramic capacitor to OUT reduces noise to 20µVRMS (10Hz to 100kHz), and which must be left floating if unused.
5 OUT power_out Regulated output (1.8V for this variant, 100mA maximum) that requires a minimum 1µF ceramic or tantalum capacitor 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
Input voltage (IN/SHDN# pin) 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), recommended VIN 1.8 15 V 5
Operating temperature TA -40 125 ℃ 5
Minimum input voltage 1.8 2.3 V ILOAD = 100mA 6
Output voltage (LKP2872ST-18) 1.725 1.8 1.86 V 2.8V < VIN < 18V, 1mA < ILOAD < 100mA 6
Line regulation (LKP2872ST-18) 1 10 mV ILOAD = 1mA 6
Load regulation (LKP2872ST-18) 15 60 mV VIN = 2.8V, 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 (LKP2872ST-18) 10 20 μA VOUT = 1.8V, VIN < 1.8V 6
Thermal resistance, junction-to-case (top) RθJc 50.18 °C/W Junction-to-case, top 5
Thermal resistance, junction-to-case (bottom) RθJc 178.92 °C/W Junction-to-case, bottom 5

CAD (KiCad official)

  • Symbol: LKP2872ST-18
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lkp2872st-18-etched.step / lkp2872st-18-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lkp2872st-18.step / lkp2872st-18.glb are 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, 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