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Generated by kicad-footprint-generator · KiCad file format 20260206

Name	Last commit message	Last updated
docs	bl9342: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray	1mo ago
viewers	pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray	2mo ago
bl9342-etched.fit.json	bl9342: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray	1mo ago
bl9342-etched.glb	bl9342: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray	1mo ago
bl9342-etched.step	bl9342: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray	1mo ago
bl9342.glb	Publish 0.1.0 · Ray	2mo ago
bl9342.kicad_mod	Publish 0.1.0 · Ray	2mo ago
bl9342.kicad_sym	Publish 0.1.0 · Ray	2mo ago
bl9342.lbr	rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray	2mo ago
bl9342.step	Publish 0.1.0 · Ray	2mo ago
package.json	Publish 0.2.0 · Ray	2mo ago
pads.json	pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray	2mo ago
page.json	bl9342: specified limits as data (metadata.characteristics, 29 rows from the datasheet) · Ray	24d ago
README.md	bl9342: specified limits as data (metadata.characteristics, 29 rows from the datasheet) · Ray	24d ago

BL9342

BL Shanghai Belling · DC-DC Converters · SOT-23-6

BL9342 from BL Shanghai Belling, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	BST	passive	Bootstrap pin. Positive supply for the internal floating high-side MOSFET driver. Connect a bypass capacitor (typ. 100 nF) between BST and SW; capacitor is charged from an internal regulator to ~5 V.
2	GND	power_in	Ground. Route as close as possible to the output capacitor return and away from high-current switching paths.
3	FB	input	Feedback input to the internal error amplifier. An external resistor divider from VOUT to GND sets the regulated output voltage, compared against the internal 0.794 V (typ. 0.8 V) reference. Recommended R1 ≈ 124 kΩ for optimal loop response.
4	EN	input	Enable input, active high. VIH ≥ 1.6 V (typ. 2.0 V) turns the chip on; pulling below the threshold shuts it down. Hysteresis 0.6 V. Internally pulled to GND so floating EN disables the part; do not leave floating in operation.
5	VIN	power_in	Power supply input, 4.2 V to 40 V (absolute max 43 V). Supplies all internal control circuitry and the integrated high-side power MOSFET. Decouple to GND with a low-ESR capacitor (e.g. 4.7 µF/50 V) placed close to the pin to minimise switching spikes.
6	SW	output	Switch node output from the internal high-side power MOSFET (RDS(on) ≈ 500 mΩ). Connect the inductor here and place a low-VF Schottky freewheeling diode from SW to GND close to the pin. Rated up to VIN (max 40 V).

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-23-6
Category	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	Vfb	0.794			V		4
Switch on-resistance	Rsw			500	mΩ	Vbst-Vsw=5V	4
Switch leakage current	Iswleak		0.1	1	uA	Ven=0V, Vsw=0V	4
Current limit	Ilim		1		A		4
Transconductance COMP to SENSE	Gcs		3		A/V		4
Minimum operating voltage	Vin min	4.2			V		4
Input undervoltage lockout threshold	Vin(UVLO)	3.3		4.2	V		4
Undervoltage lockout hysteresis	Vin(UVLO)hys		0.8		V		4
Soft-start time	Tss		0.5		msec	FB from 0 to 1.8V	4
Oscillator frequency	Fosc		1.8		MHz		4
Minimum switch on-time	Ton min	100			ns		4
Shutdown current	Isd		3	15	uA	Ven<0.3V	4
Quiescent current	Isq		200		uA	Vfb=0.9V, no load	4
Thermal shutdown	Temp		150		℃		4
EN high-level threshold	Venh	1.6		2	V		4
EN hysteresis	En hys		0.6		V		4
Supply voltage VIN (absolute maximum)	VIN	-0.3		43	V		3
Switch voltage VSW (absolute maximum)	VSW	-0.3			V	Maximum printed as VIN(MAX)+0.3V	3
BST to SW voltage (absolute maximum)	BST to SW	-0.3		6	V		3
Other pins voltage (absolute maximum)		-0.3		5	V	Other pins	3
Continuous power dissipation				0.57	W	TA=+25℃	3
Junction temperature (absolute maximum)				150	℃		3
Lead temperature (absolute maximum)				260	℃		3
Storage temperature		-65		150	℃		3
Supply voltage VIN (recommended)	VIN	4.2		40	V		3
SW terminal voltage (recommended)	VOUT			40	V	Up to 40V	3
Operating junction temperature	TJ	-40		125	℃		3
Thermal resistance junction-to-ambient, SOT23-6L	θJA		220		℃/W	SOT23-6L	3
Thermal resistance junction-to-case, SOT23-6L	θJC		110		℃/W	SOT23-6L	3

CAD (KiCad official)

Symbol: BL9342
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)
3D model files: bl9342-etched.step / bl9342-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bl9342.step / bl9342.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bl9342.step`	97 KB	You want the bare part, or you mark your own boards.
`bl9342-etched.step`	1.5 MB	You want the part with `BL9342` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 362 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: BL Shanghai Belling datasheet (10 pp, sha256 f05713c35e4f834e, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF