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LM2596R-ADJ

HTC Korea TAEJIN Tech · DC-DC Converters · TO-263-5

LM2596R-ADJ from HTC Korea TAEJIN Tech, 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	This is the positive input supply for the LM2596 step-down switching regulator, and a suitable input bypass capacitor must be present to minimize voltage transients and supply the switching currents.
2	VOUT	output	This is the emitter of the internal output switch, with a typical saturation voltage Vsat of 1.5 V, and the PCB area connected to this pin should be kept to a minimum to reduce coupling to sensitive circuitry.
3	GND	power_in	This is the circuit ground pin.
4	FEEDBACK	input	This pin senses the regulated output voltage to close the feedback loop, and on the adjustable version it is the direct input to the error amplifier, with external resistors R2 and R1 programming the output voltage.
5	ON/OFF	input	This TTL-compatible pin shuts the regulator down when driven above the typical 1.3 V threshold (up to +Vin), reducing total input supply current to approximately 80 uA, and the regulator is on if the pin is below 1.3 V or left open.
6	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	HTC Korea TAEJIN Tech
Package	TO-263-5
Category	Power Management (PMIC)
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
Feedback Voltage (Vin=12V, ILOAD=0.5A, TJ=25℃)	Vout	1.217	1.23	1.243	V	Vin=12V, ILOAD=0.5A, TJ=25℃	5
Feedback Voltage (8.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A, Vout=5.0V), TJ=25℃	Vout	1.193	1.23	1.267	V	8.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A, Vout=5.0V, TJ=25℃	5
Feedback Voltage (8.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A, Vout=5.0V), TJ=-40℃ to +125℃	Vout	1.18		1.28	V	8.0V≤Vin≤40V, 0.5A≤ILOAD≤3.0A, Vout=5.0V, TJ=-40℃~+125℃	5
Feedback Bias Current, TJ=25℃	Ib	11.52	12	12.48	nA	Vout=5.0V (Adjustable version only), TJ=25℃	6
Feedback Bias Current, TJ=0 to +125℃	Ib	11.4		12.6	nA	Vout=5.0V (Adjustable version only), TJ=0~+125℃	6
Oscillator Frequency, TJ=25℃	Fosc	127	150	173	kHz	TJ=25℃	6
Oscillator Frequency, TJ=0 to +125℃	Fosc	110		173	kHz	TJ=0~+125℃	6
Saturation Voltage, TJ=25℃	Vsat		1.16	1.4	V	Iout=3.0A (note 3), TJ=25℃	6
Saturation Voltage, TJ=0 to +125℃	Vsat			1.5	V	Iout=3.0A (note 3), TJ=0~+125℃	6
Current Limit (Peak Current), TJ=25℃	ICL	3.6	4.5	6.9	A	Note 3, TJ=25℃	6
Current Limit (Peak Current), TJ=0 to +125℃	ICL	3.4		7.5	A	Note 3, TJ=0~+125℃	6
Output Leakage Current	IL			25	µA	Output = 0V, TJ=25℃; Notes 5 and 6	6
Output Leakage Current	IL		2	10	mA	Output = -1.0V; Notes 5 and 6	6
Quiescent Current, TJ=0 to +125℃	IQ			10	mA	TJ=0~+125℃; Note 5	6
Standby Quiescent Current, TJ=25℃	ISTBY		80	200	µA	ON/OFF Pin = 5.0V (off), TJ=25℃	6
Standby Quiescent Current, TJ=0 to +125℃	ISTBY			250	µA	ON/OFF Pin = 5.0V (off), TJ=0~+125℃	6
ON/OFF Pin Logic Input Level VIH, TJ=25℃	VIH	2	1.3		V	Vout=0V, TJ=25℃	6
ON/OFF Pin Logic Input Level VIH, TJ=0 to +125℃	VIH	2			V	Vout=0V, TJ=0~+125℃	6
ON/OFF Pin Logic Input Level VIL, TJ=25℃	VIL		1.3	0.6	V	Vout=Nominal Output Voltage, TJ=25℃	6
ON/OFF Pin Logic Input Level VIL, TJ=0 to +125℃	VIL			0.6	V	Vout=Nominal Output Voltage, TJ=0~+125℃	6
ON/OFF Pin Input Current IIH	IIH		5	15	µA	VLOGIC = 2.5V (Regulator OFF)	6
ON/OFF Pin Input Current IIL	IIL		0.02	5	µA	VLOGIC = 0.5V (Regulator ON)	6
Maximum Supply Voltage	Vin			45	V		4
On/Off Pin Input Voltage (lower limit)		-0.3			V	-0.3V ≤ V ≤ +Vin; upper limit is +Vin, not a number	4
Output Voltage to Ground (Steady-State)		-1			V	Steady-state	4
Storage Temperature Range	TSTG	-60		150	℃		4
Lead Temperature (Soldering)				260	℃	Soldering, 10 seconds	4
Maximum Junction Temperature	TJ			150	℃		4
Minimum ESD Rating (Human Body Model)		2			kV	Human Body Model	4
Thermal Resistance, Junction to Ambient (TO-263-5L)	θJA		70		℃/W	TO-263-5 Lead package	4
Thermal Resistance, Junction to Case (TO-263-5L)	θJC		5		℃/W	TO-263-5 Lead package	4
Operating Junction Temperature Range	TJ	-40		125	℃		5
Supply Voltage	Vin			40	V		5

CAD (KiCad official)

Symbol: LM2596R-ADJ
Footprint: Package_TO_SOT_SMD:TO-263-5_TabPin6
3D model: TO-263-5 (KiCad packages3D, STEP)
3D model files: lm2596r-adj-etched.step / lm2596r-adj-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2596r-adj.step / lm2596r-adj.glb are the bare package body.

Provenance

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

Datasheet: HTC Korea TAEJIN Tech datasheet (10 pp, sha256 5ebad324fb99ebbf, retrieved 2026-10-18, 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