component
BL9342
Public Made by Adomby adom
BL Shanghai Belling DC-DC Converters, SOT-23-6. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownBL9342
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bl9342.step/bl9342.glbare 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).