TD7590 from Techcode Semicon, in a TO-263-5. 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	Vin	power_in	Supply voltage input for the regulator, which operates from 3.6V to 36V DC and should be bypassed to GND with a suitably large capacitor.
2	GND	power_in	Ground pin that must be placed outside the Schottky diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into the TD7590.
3	Output	output	Power switch output (SW switch node) that supplies power to the output, switching between (VIN - VSAT) and approximately -0.5V at a duty cycle of about VOUT/VIN, so its PCB copper area should be kept minimal.
4	FB	input	Feedback pin that senses the regulated output voltage through an external resistor divider, with a feedback threshold voltage of 1.222V.
5	EN	input	Digital enable input that turns the regulator off when pulled below about 0.7V and on when pulled above 1.3V, with a maximum of 12V.
6	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Techcode Semicon
Package	TO-263-5
Category	Power Management ICs
Pins	6

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Input Voltage	VIN	-0.3		36	V		3
Feedback Pin Voltage	VFB	-0.3			V		3
Enable Pin Voltage	VEN	-0.3		12	V		3
Switch Pin Voltage	VSW	-0.3			V		3
Output Power Limited	Pout			36	W		3
Operating Junction Temperature	TJ			150	ºC		3
Storage Temperature	TSTG	-65		150	ºC		3
Lead Temperature (Soldering)	TLEAD			260	ºC	Soldering, 10 sec	3
ESD (HBM)				2000	V	HBM	3
Input Voltage (recommended)	VIN	3.6		36	V		4
Operating Junction Temperature (recommended)	TJ	-40		125	ºC		4
Operating Ambient Temperature	TA	-40		85	ºC		4
Input voltage	VIN	3.6		36	V		4
Shutdown Supply Current	ISTBY		30	90	uA	VEN=0V	4
Supply Current	ICC		3.6	4	mA	VEN=2V, VFB=1.3V	4
Feedback Voltage	VFB	1.185	1.222	1.26	V	VIN = 3.6V to 23V	4
Feedback Bias Current	IFB		0.1	0.5	uA	VFB=1.3V	4
Switch Current Limit	ILIM	6		6.5	A		4
Oscillator Frequency	FOSC	200	240	280	KHz		4
EN Pin Threshold	VEN	0.7	1.2	1.7	V		4
EN Pin Input Leakage Current (high)	IH		-0.1	-1	uA	VEN=2.5V	4
EN Pin Input Leakage Current (low)	IL		-3	-10	uA	VEN=0.5V	4
Max. Duty Cycle	DMAX			100	%	VFB=0V, ISW=0.1A	4
Frequency of Current Limit or Short Circuit Protection	FOSC1		42		KHz	VFB=0V	4
Internal PMOS RDSON	RDSON		80		mΩ	VIN =12V, VFB=0V, VEN=12V, Iout=5A	4
Efficiency	η		92		%	VIN=12V, Vout=5V, Iout=5A	4
Thermal Shutdown	TOTSD		165		ºC		4
Thermal Resistance Junction to Ambient	RθJA		23		ºC / W		3
Thermal Resistance Junction to Case	RθJC		3.5		ºC / W		3

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		board copper area connected to this pin should	9

CAD (KiCad official)

Symbol: TD7590
Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
3D model: TO-263-5 (KiCad packages3D, STEP)
3D model files: td7590-etched.step / td7590-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); td7590.step / td7590.glb are the bare package body.

Provenance

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

Datasheet: Techcode Semicon datasheet (13 pp, sha256 799509304e24c4df, retrieved 2026-11-05, tier: lcsc)
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

TD7590

Verified TD7590

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README