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XT4054K421MR-G

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by Ray

NATLINEAR Battery Management, SOT-23-5L. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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XT4054K421MR-G

NATLINEAR · Battery Management · SOT-23-5L

XT4054K421MR-G from NATLINEAR, in a SOT-23-5L. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CHRG output Open-drain charge-status output. Pulled low by an internal N-channel MOSFET while charging; high-impedance when charging completes or when the input UVLO condition is detected. Drives an LED to ground; a 1 uF cap from BAT to GND causes the LED to blink rapidly when no battery is present.
2 GND power_in Ground / device reference (VSS).
3 BAT power_out Charge-current output to the Li-Ion battery. Regulates the float voltage to 4.2 V (±1%). Internal reverse-battery protection: with VBAT = -4 V a ~0.7 mA path forms between GND and BAT to protect the internal ESD diode. Requires a >=1 uF decoupling capacitor.
4 VCC power_in Positive supply input to the charger. Operating range 4.25 V to 6.5 V (absolute max 7 V); requires at least 1 uF bypass capacitance. When VCC falls within ~30 mV of VBAT the device enters shutdown and BAT current drops below 2 uA.
5 PROG bidirectional Charge-current program, current-monitor, and shutdown pin. A 1% resistor to GND sets IBAT = (VPROG/RPROG) x 1000; VPROG = 1 V in constant-current mode. Floating the pin lets an internal 3 uA pull-up raise VPROG; above ~1.21 V the part enters shutdown (ICC ~25 uA). Pin clamps near 2.4 V.

Key specifications

Parameter Value
Manufacturer NATLINEAR
Package SOT-23-5L
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • XT4054K421MR-G
  • XT4054K421ML
  • XT4054K421PR
  • XT4054K421PL

CAD (KiCad official)

  • Symbol: XT4054K421MR-G
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5L (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: NATLINEAR datasheet (10 pp, sha256 ddf60b23914cd0af, retrieved 2026-08-17, 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: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF