LT1946AEMS8E#PBF from Analog Devices, in a MSOP-8-EP. 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	VC	passive	Error amplifier output pin for external compensation (series resistor and capacitor to GND, typically 90pF to 270pF and 25k to 120k) or shorted to COMP for internal compensation.
2	FB	input	Feedback pin with 1.25V reference voltage; connect the resistive divider tap here, with VOUT = 1.25 • (1+R1/R2).
3	SHDN	input	Shutdown pin; tie to 2.4V or more to enable the device, ground to shut down, and do not float this pin.
4	GND	power_in	Ground pin; tie both Pin 4 and the exposed pad directly to the local ground plane for heat dissipation.
5	SW	passive	Switch pin, the collector of the internal NPN power switch (1.5A, 36V); minimize the metal trace area to minimize EMI.
6	VIN	power_in	Input supply pin (2.45V to 16V operating) that must be locally bypassed.
7	COMP	passive	Internal compensation pin providing an internal network (120k and 90pF); tie directly to the VC pin for internal compensation or to GND if not used.
8	SS	passive	Soft-start pin where an external capacitor is charged by 4µA to 1.5V; use a larger capacitor for slower start-up and leave floating if not in use.
9	EP	power_in	Exposed pad is ground and must be soldered to the PCB and tied to the local ground plane.

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	MSOP-8-EP
Category	Power Management ICs
Pins	9

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Minimum Operating Voltage			2.45	2.6	V		2
Maximum Operating Voltage				16	V		2
Feedback Voltage		1.23	1.25	1.27	V	TA = 25°C	2
Feedback Voltage (full temperature range)		1.22		1.27	V	Over full operating temperature range	2
FB Pin Bias Current			20	120	nA	VFB = 1.25V (Note 3)	2
Quiescent Current			3.6	5	mA	VSHDN = 2.5V, Not Switching	2
Quiescent Current in Shutdown			0	1	µA	VSHDN = 0V, VIN = 3V	2
Reference Line Regulation			0.01	0.05	%/V	2.6V ≤ VIN ≤ 16V	2
Switching Frequency		2.4	2.7	3	MHz	TA = 25°C	2
Switching Frequency (full temperature range)		2.3		3.1	MHz	Over full operating temperature range	2
Maximum Duty Cycle		73	80		%	Over full operating temperature range	2
Switch Current Limit		1.5	2.1	3.1	A	Note 4; over full operating temperature range	2
Switch VCESAT			240	340	mV	ISW = 1A	2
Switch Leakage Current			0.01	1	µA	VSW = 5V	2
Soft-Start Charging Current		2.5	4	6	µA	VSS = 0.5V	2
SHDN Input Voltage High		2.4			V		2
SHDN Input Voltage Low				0.5	V		2
SHDN Pin Bias Current			16	32	µA	VSHDN = 3V	2
SHDN Pin Bias Current			0	0.1	µA	VSHDN = 0V	2
Error Amp Transconductance			40		µmhos	∆I = 2µA	2
Error Amp Voltage Gain			300		V/V		2
Switching Frequency in Foldback			0.85		MHz	VFB = 0V	2
VIN Voltage	VIN			16	V		2
SW Voltage		-0.4		36	V		2
FB Voltage				2.5	V		2
Current into FB Pin		-1		1	mA		2
SHDN Voltage				16	V		2
Maximum Junction Temperature	TJMAX			125	°C		2
Operating Temperature Range		-40		85	°C	Note 2	2
Storage Temperature Range		-65		150	°C		2
Lead Temperature (Soldering, 10 sec)				300	°C		2
Thermal Resistance Junction-to-Ambient	θJA		40		°C/W	MS8E package	2
Thermal Resistance Junction-to-Case	θJC		10		°C/W	MS8E package	2

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part	Material	Colour / plating	Datasheet says	Page
contacts	COPPER		PIN 1(VC) AND PIN 2(FB). USE MULTIPLE VIAS TO TIE PIN 4 COPPER TO GROUND PLANE. USE	9

CAD (KiCad official)

Symbol: LT1946AEMS8E#PBF
Footprint: Package_SO:MSOP-8-1EP_3x3mm_P0.65mm_EP1.5x1.8mm
3D model: MSOP-8-EP (KiCad packages3D, STEP)
3D model files: lt1946aems8e-pbf-etched.step / lt1946aems8e-pbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1946aems8e-pbf.step / lt1946aems8e-pbf.glb are the bare package body.

Provenance

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

Datasheet: Analog Devices datasheet (12 pp, sha256 84a27bebe27b50dd, retrieved 2026-10-31, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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).

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LT1946AEMS8E#PBF

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3D Model

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