LM5022MMX from Texas Instruments, in a VSSOP-10-0.5mm. 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	Source input voltage pin that feeds the start-up regulator and operates from 6 V to 60 V.
2	FB	input	Inverting input to the internal voltage error amplifier, whose non-inverting input connects to a 1.25-V reference.
3	COMP	bidirectional	Error amplifier output and PWM comparator input, with control loop compensation components connected between this pin and FB.
4	VCC	power_out	Output of the internal high-voltage linear regulator that must be bypassed to GND with a ceramic capacitor.
5	OUT	output	Gate driver output that connects to the external MOSFET gate and provides 1-A peak current capability.
6	GND	power_in	System ground.
7	UVLO	input	Input undervoltage lockout set through a resistor divider from the input voltage, with a 20-µA current source providing hysteresis.
8	CS	input	Current sense input for the switch current used in current mode control and cycle-by-cycle current limiting.
9	RT/SYNC	input	Oscillator frequency adjust pin where an external resistor to GND sets the frequency, and which also accepts an AC-coupled synchronization input.
10	SS	input	Soft-start pin where an external capacitor to ground is charged by a 10-µA current source to create the start-up ramp voltage.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	VSSOP-10-0.5mm
Category	Power Management ICs
Pins	10

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
VIN to GND		-0.3		65	V		4
VCC to GND		-0.3		16	V		4
RT/SYNC to GND		-0.3		5.5	V		4
OUT to GND		-1.5			V	for < 100 ns	4
All other pins to GND		-0.3		7	V		4
Junction temperature	TJ			150	°C		4
Storage temperature	Tstg	-65		150	°C		4
Supply voltage		6		60	V		4
External voltage at VCC		7.5		14	V		4
Junction temperature (operating)	TJ	-40		125	°C		4
Junction-to-ambient thermal resistance	RθJA		161.5		°C/W	DGS (VSSOP) 10 pins	4
Junction-to-case (top) thermal resistance	RθJC(top)		56		°C/W	DGS (VSSOP) 10 pins	4
Junction-to-board thermal resistance	RθJB		81.3		°C/W	DGS (VSSOP) 10 pins	4
Junction-to-top characterization parameter	ψJT		5.7		°C/W	DGS (VSSOP) 10 pins	4
Junction-to-board characterization parameter	ψJB		80		°C/W	DGS (VSSOP) 10 pins	4
FB pin voltage	VFB	1.225	1.25	1.275	V		5
VCC regulation	VCC	6.6	7	7.4	V	10 V ≤ VIN ≤ 60 V, ICC = 1 mA	5
Supply current	ICC		3.5	4	mA	OUT Pin Capacitance = 0, VCC = 10 V	5
VCC current limit	ICC-LIM	15		35	mA	VCC = 0 V	5
Dropout voltage across bypass switch	VIN - VCC			200	mV	ICC = 0 mA, ƒSW < 200 kHz, 6 V ≤ VIN ≤ 8.5 V	5
Startup regulator leakage	IVIN		150	500	µA	VIN = 60 V	5
Shutdown current	IIN-SD		350	450	µA	VUVLO = 0 V, VCC = Open Circuit	5
COMP pin current sink capability	ICOMP	5		17	mA	VFB = 1.5 V, VCOMP = 1 V	5
Shutdown threshold	VSD	1.22	1.25	1.28	V		5
Shutdown hysteresis current source	ISD-HYS	16	20	24	µA		5
Current limit threshold voltage	VCS	0.45	0.5	0.55	V		5
CS pin sink impedance	RCS	40		75	Ω	Blanking active	5
Soft-start current source	ISS	7	10	13	µA		5
Soft start to COMP offset	VSS-OFF	0.35	0.55	0.75	V		5
Oscillator frequency	fSW	170	200	230	kHz	RT to GND = 84.5 kΩ	6
Oscillator frequency	fSW	525	600	675	kHz	RT to GND = 27.4 kΩ	6
Oscillator frequency	fSW	865	990	1115	kHz	RT to GND = 16.2 kΩ	6
Maximum duty cycle	DMAX		90	95	%		6
COMP pin open circuit voltage	VCOMP-OC	4.3	5.2	6.1	V	VFB = 0 V	6
COMP pin short circuit current	ICOMP-SC	0.6	1.1	1.5	mA	VCOMP = 0 V, VFB = 1.5 V	6
Slope compensation amplitude	VSLOPE	83	110	137	mV		6
Output high saturation voltage (VCC, VOUT)	VSAT-HI	0.25		0.75	V	IOUT = 50 mA	6
Output low saturation voltage (VOUT)	VSAT-LO	0.25		0.75	V	IOUT = 100 mA	6

CAD (KiCad official)

Symbol: LM5022MMX
Footprint: Package_SO:MSOP-10_3x3mm_P0.5mm
3D model: VSSOP-10-0.5mm (KiCad packages3D, STEP)
3D model files: lm5022mmx-etched.step / lm5022mmx-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm5022mmx.step / lm5022mmx.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (41 pp, sha256 81fac7aadae5194f, retrieved 2026-11-05, 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).

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LM5022MMX

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