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CM1843AA2

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iCM(创芯微) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CM1843AA2

iCM(创芯微) · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

CM1843AA2 from iCM(创芯微), in a SOT-89-3. 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 GND power_in Ground reference pin; the regulator's common return, and the datasheet limits VIN-to-GND to -0.3 V to 45 V and VOUT-to-GND to -0.3 V to Vin+7 V.
2 VIN power_in Supply input, specified for 3 V to 40 V with an absolute maximum of -0.3 V to 45 V to GND, and the datasheet notes VOUT-to-VIN must stay within -50 V to 0.3 V.
3 VOUT power_out Regulated fixed 12 V output, rated for up to 300 mA, with VOUT-to-GND limited to -0.3 V to Vin+7 V and VOUT-to-VIN limited to -50 V to 0.3 V.

Key specifications

Parameter Value
Manufacturer iCM(创芯微)
Package SOT-89-3
Category Power Management (PMIC)
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
输入电压 Input voltage VIN 3 40 V 4
静态电流 Quiescent current IGND 2.8 6.5 µA VIN=12V, no load 4
输出电压精度 Output voltage accuracy VOUT -2 2 % VIN=18V, IOUT=10mA 4
输出电流 Output current IOUT_MAX 300 350 mA 4
输入输出压差 Dropout voltage (VOUT=3.0~13V row, applies to 12V) VDROP 1000 1500 mV VOUT=3.0~13V 4
负载调整率 Load regulation ΔVOUT 0.1 mV/mA 1mA≤IOUT≤100mA 4
线性调整率 Line regulation ΔVOUT100/ΔVINVOUT 0.3 mV/V IOUT=1mA, VIN=(VOUTNOM+2V) to 40V 4
电源抑制比 Power supply rejection ratio PSRR 70 dB IOUT=10mA, f=1KHz 4
限流保护 Current limit ILIMIT 450 800 mA 4
过温保护 Thermal shutdown TSHDN 155 ℃ 4
过温恢复 Thermal shutdown recovery TSHDNR 125 ℃ 4
使能高电平 EN high enabled threshold 1 V EN High Enabled 4
使能低电平关断 EN low shutdown threshold 0.4 V EN Low Shutdown 4
VIN到地耐压 VIN to GND voltage VIN -0.3 45 V 3
VOUT到地耐压 VOUT to GND voltage VOUT -0.3 V Printed max is Vin+7 V (not a fixed number) 3
VOUT到VIN耐压 VOUT to VIN voltage VOUT-VIN -50 0.3 V 3
工作环境温度 Operating ambient temperature TA -40 85 ℃ 3
存储温度 Storage temperature TSTG -40 150 ℃ 3
工作结温 Operating junction temperature TJ 150 ℃ 3
热阻 Thermal resistance SOT89-3 θJA 180 ℃/W SOT89-3 3
HBM ESD HBM 2 KV Printed as 2K V 3
CDM ESD CDM 1.5 KV Printed as 1.5K V 3

CAD (KiCad official)

  • Symbol: CM1843AA2
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: cm1843aa2-etched.step / cm1843aa2-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cm1843aa2.step / cm1843aa2.glb are the bare package body.

Provenance

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

  • Datasheet: iCM(创芯微) datasheet (11 pp, sha256 6c81b4864a8d9878, retrieved 2026-10-18, 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-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