component
BD9E300EFJ-LBE2
Public Made by Adomby adom
ROHM Semicon DC-DC Converters, SOIC-8. Pinout cross-checked by two models against 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
markdownBD9E300EFJ-LBE2
ROHM Semicon · DC-DC Converters · SOIC-8
BD9E300EFJ-LBE2 from ROHM Semicon, in a SOIC-8. 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 | BOOT | passive | Connect a 0.1µF bootstrap capacitor between this terminal and SW; its voltage is the gate drive voltage of the high-side MOSFET. |
| 2 | VIN | power_in | Power supply terminal for the switching regulator and control circuit; a 10µF ceramic capacitor is recommended. |
| 3 | EN | input | Low level (0.8V or lower) forces shutdown mode, high level (2.5V or higher) enables the device; the terminal must be terminated. |
| 4 | AGND | power_in | Ground terminal for the control circuit. |
| 5 | FB | input | Inverting input node for the gm error amplifier, used with a resistor divider to set the output voltage. |
| 6 | COMP | passive | Input terminal for the gm error amplifier output and output switch current comparator; connect a frequency phase compensation component here. |
| 7 | PGND | power_in | Ground terminal for the output stage of the switching regulator. |
| 8 | SW | output | Switch node connected to the source of the high-side MOSFET and drain of the low-side MOSFET; connect the inductor and 0.1µF bootstrap capacitor to BOOT. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | SOIC-8 |
| Category | Power Management |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Current in Operating | IOPR | 1.5 | 2.5 | mA | VFB = 1.1V, No switching | 5 | |
| Supply Current in Standby | ISTBY | 0 | 10 | µA | VEN = 0V | 5 | |
| Reference Voltage | VFB | 0.98 | 1 | 1.02 | V | 5 | |
| FB Input Current | IFB | -1 | 0 | 1 | µA | VFB = 0V | 5 |
| Switching frequency | FOSC | 0.85 | 1 | 1.15 | MHz | 5 | |
| Maximum Duty ratio | Maxduty | 85 | 90 | 95 | % | 5 | |
| UVLO detection voltage | VUVLO | 6.1 | 6.4 | 6.7 | V | VIN falling | 5 |
| UVLO hysteresis voltage | VUVLOHYS | 100 | 200 | 300 | mV | 5 | |
| EN high-level input voltage | VENH | 2.5 | V | Max printed as VIN | 5 | ||
| EN low-level input voltage | VENL | 0.8 | V | 5 | |||
| EN Input current | IEN | 2.1 | 4.2 | 8.4 | µA | VEN = 3V | 5 |
| Soft Start time | TSS | 1.5 | 3 | 6 | msec | EN rising to FB=0.85V | 5 |
| High-side FET on-resistance | RONH | 170 | mΩ | ISW = 100mA | 5 | ||
| Low-side FET on-resistance | RONL | 140 | mΩ | ISW = 100mA | 5 | ||
| Over Current limit | ILIMIT | 5 | A | 5 | |||
| Supply Voltage (recommended) | VIN | 7 | 36 | V | 5 | ||
| Output Current (recommended) | IOUT | 0 | 2.5 | A | 5 | ||
| Output Voltage Range (recommended) | VRANGE | 1 | V | Max printed as VIN × 0.7 | 5 | ||
| Supply Voltage | VIN | -0.3 | 40 | V | Ta = 25°C | 5 | |
| EN Input Voltage | VEN | -0.3 | 40 | V | Ta = 25°C | 5 | |
| Voltage from GND to BOOT | VBOOT | -0.3 | 45 | V | Ta = 25°C | 5 | |
| Voltage from SW to BOOT | ΔVBOOT | -0.3 | 7 | V | Ta = 25°C | 5 | |
| FB Input Voltage | VFB | -0.3 | 7 | V | Ta = 25°C | 5 | |
| COMP Input Voltage | VCOMP | -0.3 | 7 | V | Ta = 25°C | 5 | |
| SW Input Voltage | VSW | -0.5 | V | Max printed as VIN + 0.3; Ta = 25°C | 5 | ||
| Allowable Power Dissipation | Pd | 3.75 | W | Ta = 25°C, 4-layer 70.0mm x 70.0mm x 1.6mm board; derate 30.08 mW/°C above 25°C | 5 | ||
| Operating Junction Temperature Range | Tj | -40 | 150 | °C | 5 | ||
| Storage Temperature Range | Tstg | -55 | 150 | °C | 5 | ||
| Thermal resistance junction to ambient | θJA | 33.3 | °C/W | HTSOP-J8, 4 layer board (back side copper foil area 70mm×70mm) | 25 |
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 | Provide the input capacitor as close to the VIN terminal as possible on the same plane as the IC. If there is any unused area on the PCB, provide a copper foil plane for the ground node to assist | 24 |
CAD (KiCad official)
- Symbol:
BD9E300EFJ-LBE2 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
bd9e300efj-lbe2-etched.step/bd9e300efj-lbe2-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bd9e300efj-lbe2.step/bd9e300efj-lbe2.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ROHM Semicon datasheet (33 pp, sha256
a7f7cfbf46a147fe, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).