ME2199ASG from MICRONE, in a SOP-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	VSENSE	input	Current-sense resistor connection. The internal current-limit comparator trips when V(VSENSE) reaches the 100mV (typ, 92-114mV) reference; in constant-current mode the output current is set by RSENSE = 0.1V / IOUT.
2	FB	input	Voltage feedback input to the error amplifier. Regulates to VFB = 1.25V (±2%, 1.225-1.275V); output voltage set by VOUT = 1.25V × (1 + RFB1/RFB2). Input bias current ±0.1µA.
3	VDD	power_in	Chip supply pin, powered from an internal LDO fed by VIN. Bypass with a 1µF ceramic capacitor to GND. Absolute max 5.5V.
4	NC	unconnected	No connect. Leave floating or tie to GND per board practice.
5	GND	power_in	Device ground reference for the analog control circuitry and the external MOSFET gate driver return.
6	VIN	input	Over-voltage protection / VIN feedback sense pin, connected to the boost-output side for OVP feedback (not the main power supply - that enters via the internal LDO from this same rail sense). Absolute max 5.5V on this feedback path; the boost input rail itself supports 2.7-25V.
7	EXT	output	External power-MOSFET gate driver output. Drives the gate of the external N-channel switch at up to ~1MHz with PWM/PFM modulation and internal ramp/phase compensation.
8	CE	input	Chip enable / shutdown control. VIH ≥ 0.75V enables the device; VIL ≤ 0.3V puts it in shutdown (ISSS ≤ 5µA at VEN = 0V). Input leakage ±0.1µA.

Key specifications

Parameter	Value
Manufacturer	MICRONE
Package	SOP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

ME2199ASG
ME2199ASGAG8G

CAD (KiCad official)

Symbol: ME2199ASG
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: MICRONE datasheet (8 pp, sha256 09774b5d62b731fc, 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