EG1198 from EG Micro, 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	VIN	power_in	Chip power supply input. Absolute maximum 120 V; recommended operating range 10 V to 120 V. Bypass with a low-ESR input capacitor close to the pin.
2	GND	power_in	Device ground reference.
3	EN	input	Enable input, active high. EN_on ≥ 2.8 V (max 7 V) turns the converter on; EN_off ≤ 1 V places the part in standby (Isd ≤ 200 µA).
4	FB	input	Output voltage feedback input to the internal error amplifier. Regulated to VREF = 1.25 V (1.21 V to 1.29 V). Vout = (1 + R1/R2) × 1.25 V. Input bias current ≤ 1 µA.
5	VD	passive	External bootstrap diode connection. Used together with VB to generate the floating high-side gate drive supply.
6	VB	passive	Floating bootstrap supply for the high-side MOSFET driver. Rated VS-0.3 V to VS+7 V; connect a bootstrap capacitor between VB and VS.
7	VS	output	Floating ground / switch node. Connects to the source of the internal high-side power MOSFET and drives the external inductor and freewheeling diode. Rated -0.3 V to 125 V.
8	IS	input	MOSFET peak current-limit sense input. Trips at a current-sense voltage of approximately 0.18 V (I_peak ≈ 0.18 / R1) for cycle-by-cycle current limiting. Rated VS-0.3 V to VS+6 V.
9	EP/VIN	power_in	Exposed thermal pad on the backside of the ESOP-8 package, internally tied to VIN. Solder to a large copper pour connected to VIN for improved thermal dissipation and higher output current capability.

Key specifications

Parameter	Value
Manufacturer	EG Micro
Package	ESOP-8
Category	PMIC
Pins	9

CAD (KiCad official)

Symbol: EG1198
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm
3D model: ESOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`eg1198.step`	125 KB	You want the bare part, or you mark your own boards.
`eg1198-etched.step`	1.5 MB	You want the part with `EG1198` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 383 faces against 152 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: EG Micro datasheet (10 pp, sha256 5486b7021c845a8e, 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