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LN4056A

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by Ray

NATLINEAR Battery Management, ESOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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LN4056A

NATLINEAR · Battery Management · ESOP-8

LN4056A from NATLINEAR, in a ESOP-8. 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 TEMP input Battery NTC thermistor sense input. Charging is paused when VTEMP is outside 30%*VIN (VLOW) to 60%*VIN (VHIGH), indicating an over/under temperature battery fault; charging resumes when VTEMP returns to within range.
2 ISET bidirectional Charge current program, monitor, and shutdown pin. A 1% resistor to GND sets charge current per IBAT = (VISET/RISET) * 960; pin holds ~1V in constant-current mode. Floating the resistor allows an internal 3uA pull-up to trigger shutdown at 1.21V (clamped ~2.4V), reducing input current to ~25uA.
3 GND power_in Ground reference. The EXPOSED thermal pad must also be connected to pin 3 (GND) to improve heat dissipation for reliable operation.
4 VIN power_in Positive supply input, 4.25V to 6.5V. Requires at least a 1uF bypass capacitor. When VIN falls to within 30mV of VBAT, charging stops and BAT sink current drops below 0.1uA.
5 VBAT power_out Battery output pin; connect to the positive terminal of the single-cell Li-ion battery. Sinks ~2uA when fully charged with VIN present, and <0.1uA when VIN is removed (sleep mode).
6 DONE output Open-drain charge-complete indicator. Pulled low when charging has terminated; high-impedance otherwise. VOL ~0.35V at 5mA sink.
7 CHRG output Open-drain charge-in-progress indicator. Pulled low while charging the battery; high-impedance otherwise. VOL ~0.35V at 5mA sink.
8 CE input Chip enable. Drive high to enable charging, drive low to disable charging; in shutdown the quiescent current is below 20uA.
9 EP power_in Exposed thermal pad on the underside of the ESOP-8 package. Must be connected to GND (pin 3) to provide the primary thermal path and ensure stable operation at high charge currents.

Key specifications

Parameter Value
Manufacturer NATLINEAR
Package ESOP-8
Category PMIC
Pins 9

Ordering variants

Same part, different packaging or reel option.

  • LN4056AS

CAD (KiCad official)

  • Symbol: LN4056A
  • Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
  • 3D model: ESOP-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: NATLINEAR datasheet (8 pp, sha256 4e66b5b972d5df57, 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