LT1931AIS5#TRMPBF from Analog Devices, in a TSOT-23-5. 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	SW	output	Switch pin: connect the inductor and catch diode here, and minimize the trace area at this pin to keep EMI down.
2	GND	power_in	Ground pin: tie directly to the local ground plane.
3	NFB	input	Feedback pin with a reference voltage of -1.255V: connect the resistive divider tap here and minimize trace area, since the NFB bias current flows out of the pin.
4	SHDN	input	Shutdown pin: tie to 2.4V or more to enable the device and ground it to shut down.
5	VIN	power_in	Input supply pin, which must be locally bypassed; the datasheet rates the operating voltage from 2.6V minimum to 16V maximum.

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	TSOT-23-5
Category	Power Supply Chip
Pins	5

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Feedback Voltage		-1.275	-1.255	-1.235	V		2
Feedback Voltage (over temperature)		-1.28		-1.23	V	● over full operating temperature range	2
NFB Pin Bias Current		8		16	µA	VNFB = -1.255V; ● over full operating temperature range	2
Quiescent Current			5.8	8	mA	VSHDN = 2.4V, Not Switching	2
Quiescent Current in Shutdown			0.01	1	µA	VSHDN = 0V, VIN = 3V	2
Reference Line Regulation			0.01	0.05	%/V	2.6V ≤ VIN ≤ 16V	2
Switching Frequency		1.8	2.2	2.6	MHz		2
Switching Frequency (over temperature)		1.6		2.9	MHz	● over full operating temperature range	2
Maximum Duty Cycle		75		82	%	● over full operating temperature range	2
Switch Current Limit		1	1.2	2.5	A	(Note 3)	2
Switch VCESAT			400	600	mV	ISW = 1A	2
Switch Leakage Current			0.01	1	µA	VSW = 5V	2
SHDN Input Voltage, High		2.4			V		2
SHDN Input Voltage, Low				0.5	V		2
SHDN Pin Bias Current			35	70	µA	VSHDN = 3V	2
SHDN Pin Bias Current			0	0.1	µA	VSHDN = 0V	2
Maximum Operating Voltage				16	V		2
VIN Voltage (absolute maximum)	VIN			16	V		2
SW Voltage	SW	-0.4		36	V		2
NFB Voltage	NFB	-2			V		2
Current Into NFB Pin		-1		1	mA		2
SHDN Voltage	SHDN			16	V		2
Maximum Junction Temperature	TJ			125	°C		2
Operating Temperature Range	TA	-40		85	°C	LT1931AI guaranteed over this range (Note 2)	2
Storage Temperature Range	TSTG	-65		150	°C		2
Lead Temperature (Soldering)				300	°C	10 sec soldering	2
Thermal Resistance, Junction to Ambient	θJA		150		°C/W	TJMAX = 125°C	2

CAD (KiCad official)

Symbol: LT1931AIS5#TRMPBF
Footprint: Package_TO_SOT_SMD:TSOT-23-5
3D model: TSOT-23-5 (KiCad packages3D, STEP)
3D model files: lt1931ais5-trmpbf-etched.step / lt1931ais5-trmpbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1931ais5-trmpbf.step / lt1931ais5-trmpbf.glb are the bare package body.

Provenance

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

Datasheet: Analog Devices datasheet (12 pp, sha256 86f1f10ba5e475b2, retrieved 2026-10-30, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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).

Datasheet PDF

LT1931AIS5#TRMPBF

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3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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