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BCT1901EGG-TR
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BROADCHIP DC-DC Converters, QFN-24-EP(4x4). 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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README
markdownBCT1901EGG-TR
BROADCHIP · DC-DC Converters · QFN-24-EP(4x4)
BCT1901EGG-TR from BROADCHIP, in a QFN-24-EP(4x4). 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 | NC | unconnected | No connect pin, listed as NC in the datasheet pin description table. |
| 2 | NC | unconnected | No connect pin, listed as NC in the datasheet pin description table. |
| 3 | LX1 | output | Power switching output of regulator 1 that connects the inductor to the drains of the internal high-side PMOS and low-side NMOS; the SWn pin is rated -0.3 V to VIN+0.3 V. |
| 4 | EN1 | input | Active-high enable pin of regulator 1, with a rising threshold of 1.5 V and a falling threshold of 0.4 V; the ENn pin is rated -0.3 V to VIN+0.3 V. |
| 5 | FB2 | input | Output feedback pin of regulator 2 that senses the output and regulates it to 0.6 V (VFB 0.585 V to 0.615 V) through an external resistive divider. |
| 6 | IN2 | power_in | Power supply input of regulator 2, specified for VIN from 2.7 V to 5.5 V with an absolute maximum of 6.5 V. |
| 7 | NC | unconnected | No connect pin, listed as NC in the datasheet pin description table. |
| 8 | NC | unconnected | No connect pin, listed as NC in the datasheet pin description table. |
| 9 | LX2 | output | Power switching output of regulator 2 that connects the inductor to the drains of the internal high-side PMOS and low-side NMOS; the SWn pin is rated -0.3 V to VIN+0.3 V. |
| 10 | EN2 | input | Active-high enable pin of regulator 2, with a rising threshold of 1.5 V and a falling threshold of 0.4 V; the ENn pin is rated -0.3 V to VIN+0.3 V. |
| 11 | FB3 | input | Output feedback pin of regulator 3 that senses the output and regulates it to 0.6 V (VFB 0.585 V to 0.615 V) through an external resistive divider. |
| 12 | IN3 | power_in | Power supply input of regulator 3, specified for VIN from 2.7 V to 5.5 V with an absolute maximum of 6.5 V. |
| 13 | NC | unconnected | No connect pin, listed as NC in the datasheet pin description table. |
| 14 | NC | unconnected | No connect pin, listed as NC in the datasheet pin description table. |
| 15 | LX3 | output | Power switching output of regulator 3 that connects the inductor to the drains of the internal high-side PMOS and low-side NMOS; the SWn pin is rated -0.3 V to VIN+0.3 V. |
| 16 | EN3 | input | Active-high enable pin of regulator 3, with a rising threshold of 1.5 V and a falling threshold of 0.4 V; the ENn pin is rated -0.3 V to VIN+0.3 V. |
| 17 | FB4 | input | Output feedback pin of regulator 4 that senses the output and regulates it to 0.6 V (VFB 0.585 V to 0.615 V) through an external resistive divider. |
| 18 | IN4 | power_in | Power supply input of regulator 4, specified for VIN from 2.7 V to 5.5 V with an absolute maximum of 6.5 V. |
| 19 | NC | unconnected | No connect pin, listed as NC in the datasheet pin description table. |
| 20 | LX4 | output | Power switching output of regulator 4 that connects the inductor to the drains of the internal high-side PMOS and low-side NMOS; the SWn pin is rated -0.3 V to VIN+0.3 V. |
| 21 | EN4 | input | Active-high enable pin of regulator 4, with a rising threshold of 1.5 V and a falling threshold of 0.4 V; the ENn pin is rated -0.3 V to VIN+0.3 V. |
| 22 | FB1 | input | Output feedback pin of regulator 1 that senses the output and regulates it to 0.6 V (VFB 0.585 V to 0.615 V) through an external resistive divider. |
| 23 | NC | unconnected | No connect pin, listed as NC in the datasheet pin description table. |
| 24 | IN1 | power_in | Power supply input of regulator 1, specified for VIN from 2.7 V to 5.5 V with an absolute maximum of 6.5 V. |
| 25 | GND | power_in | Ground and thermal pin (exposed pad) for the package. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BROADCHIP |
| Package | QFN-24-EP(4x4) |
| Category | Power Supply Chip |
| Pins | 25 |
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 Input Supply Voltage | VIN | 2.7 | 5.5 | V | 5 | ||
| Feedback Voltage | VFB | 0.585 | 0.6 | 0.615 | V | 5 | |
| Shutdown Supply Current | ISD | 1 | uA | VEN=0V | 5 | ||
| Input Supply Voltage | -0.3 | 6.5 | V | 4 | |||
| ENn, FBn, SWn pin voltage (absolute maximum -0.3V to VIN+0.3V) | -0.3 | V | Upper limit printed as VIN+0.3V, not a number | 4 | |||
| Storage Temperature Range | -65 | 150 | ℃ | 4 | |||
| Junction Temperature | 150 | ℃ | 4 | ||||
| Operating Temperature Range | -40 | 85 | ℃ | 4 | |||
| VIN UVLO Threshold | VIN_MIN | 2.4 | V | VIN Rising | 5 | ||
| VIN Under Voltage Lockout Threshold Hysteresis | VIN_MIN_HYST | 200 | mV | VIN Falling | 5 | ||
| Supply Current @ A(1) | IQ | 40 | uA | VEN=5V, VFB=0.63V | 5 | ||
| Supply Current @ B(2) | IQ | 55 | uA | VEN=5V, VFB=0.63V | 5 | ||
| Top Switch On-Resistance @ A(1) | RDS(ON)T | 200 | mΩ | 5 | |||
| Top Switch On-Resistance @ B(2) | RDS(ON)T | 110 | mΩ | 5 | |||
| Bottom Switch On-Resistance @ A(1) | RDS(ON)B | 150 | mΩ | 5 | |||
| Bottom Switch On-Resistance @ B(2) | RDS(ON)B | 80 | mΩ | 5 | |||
| Switch Frequency @ A(1) | FSW | 1.5 | MHz | 5 | |||
| Switch Frequency @ B(2) | FSW | 1 | MHz | 5 | |||
| Top Switch Current Limit @ A(1) | ILIM_TOP | 1.8 | A | 5 | |||
| Top Switch Current Limit @ B(2) | ILIM_TOP | 3.5 | A | 5 | |||
| Max Duty Cycle | 100 | % | 5 | ||||
| Minimum On Time @ A(1) | TON_MIN | 100 | ns | 5 | |||
| Minimum On Time @ B(2) | TON_MIN | 300 | ns | 5 | |||
| EN Rising threshold voltage | VEN_H | 1.5 | V | VEN rising | 5 | ||
| EN Falling threshold | VEN_L | 0.4 | V | VEN falling | 5 | ||
| EN Input current | IIN | 1 | uA | VEN = 0V to VIN | 5 | ||
| Soft-Start Time | tSS | 1 | ms | 5 | |||
| Thermal Shutdown Temperature | TSD | 160 | ℃ | 5 | |||
| Thermal Shutdown Hysteresis | THYS | 15 | ℃ | 5 |
CAD (KiCad official)
- Symbol:
BCT1901EGG-TR - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm - 3D model: QFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files:
bct1901egg-tr-etched.step/bct1901egg-tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bct1901egg-tr.step/bct1901egg-tr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BROADCHIP datasheet (8 pp, sha256
babfcd0b56ad1306, retrieved 2026-10-21, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).