# OB2506NCP

**OB(On-Bright Elec)** · Battery Management ICs · SOP-8

OB2506NCP from OB(On-Bright Elec), in a SOP-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 | FB | input | Feedback input pin; the PWM duty cycle is determined by the voltage level into this pin and the current-sense signal at CS (5V open loop voltage, 15kΩ internal pull-up). |
| 2 | VCC | power_in | Power supply pin with recommended operating range 8 to 25V, UVLO exit 18.2V typ and enter 7.0V typ, absolute maximum 28V. |
| 3 | AUX | input | Voltage feedback from the auxiliary winding via a resistor divider reflecting output voltage, with output OVP threshold of 3.0V typ and absolute maximum of 7V. |
| 4 | CS | input | Current sense input where external sense resistor Rs sets the CC point and output power, with 300ns leading edge blanking and absolute maximum of 7V. |
| 5 | Drain | passive | Drain of the internal 600V power MOSFET (Rdson 8Ω for OB2506N), connected to pin 6. |
| 6 | Drain | passive | Drain of the internal 600V power MOSFET (Rdson 8Ω for OB2506N), connected to pin 5. |
| 7 | GND | power_in | Ground pin. |
| 8 | GND | power_in | Ground pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | OB(On-Bright Elec) |
| Package | SOP-8 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| VCC under voltage lockout exit | UVLO(OFF) | 16 | 18.2 | 20.5 | V | TA=25℃, VCC=18V | 4 |
| VCC under voltage lockout enter | UVLO(ON) | 6.5 | 7 | 7.5 | V | TA=25℃, VCC=18V | 4 |
| VCC over voltage protection | VCC_OVP | 26 | 27 | 28.5 | V | TA=25℃, VCC=18V | 4 |
| Max. Operating Voltage |  |  |  | 25 | V |  | 4 |
| Minimum over current threshold | Vth_ocp_min | 485 | 500 | 515 | mV |  | 4 |
| Maximum over current threshold | Vth_ocp_max |  | 590 |  | mV |  | 4 |
| Output Over voltage threshold | V_OVP | 2.8 | 3 | 3.2 | V |  | 4 |
| Over temperature protection trigger point | T_otp | 135 | 150 | 165 | ℃ |  | 4 |
| Over temperature protection recovery point | T_otp_rec | 105 | 120 | 135 | ℃ |  | 4 |
| VCC Supply Voltage | VCC | 8 |  | 25 | V |  | 2 |
| Drain Voltage (off state) |  | -0.3 |  |  | V | -0.3V to Bvdss | 2 |
| VCC Voltage | VCC | -0.3 |  | 28 | V |  | 2 |
| AUX Input Voltage |  | -0.3 |  | 7 | V |  | 2 |
| FB Input Voltage |  | -0.3 |  | 7 | V |  | 2 |
| CS Input Voltage |  | -0.3 |  | 7 | V |  | 2 |
| Operating Junction Temperature | TJ | -40 |  | 150 | ℃ |  | 2 |
| Operating Ambient Temperature | TA | -20 |  | 85 | ℃ |  | 2 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 2 |
| Lead Temperature |  |  |  | 260 | ℃ | Soldering, 10secs | 2 |
| Package Dissipation Rating (junction to ambient) SOP8 | RθJA |  | 95 |  | ℃/W | SOP8 | 2 |
| Start up current | I start-up |  | 5 |  | uA | VCC=UVLO_OFF-1V | 4 |
| Static current | I static |  | 0.7 |  | mA |  | 4 |
| LEB time | TLEB |  | 300 |  | ns |  | 4 |
| CS minimum threshold | Vcs_min |  | 150 |  | mV |  | 4 |
| VFB Open Loop Voltage | VFB Open |  | 5 |  | V |  | 4 |
| PWM input gain | Avcs |  | 4.8 |  | V/V | ∆VFB/∆VCS | 4 |
| Threshold exits burst mode | Vref_burst_H |  | 1.05 |  | V |  | 4 |
| Threshold enters burst mode | Vref_burst_L |  | 0.95 |  | V |  | 4 |
| FB pin pull high resistor | Rfb |  | 15 |  | KΩ |  | 4 |
| FB pin pull high current | Ifb |  | 35 |  | uA |  | 4 |
| Mosfet Drain-Source Breakdown Voltage | BVdss |  | 600 |  | V |  | 4 |
| Static drain to source on resistance | Rdson |  | 8 |  | Ώ | OB2506N | 4 |

## CAD (KiCad official)

- Symbol: `OB2506NCP`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `ob2506ncp-etched.step` / `ob2506ncp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ob2506ncp.step` / `ob2506ncp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [OB(On-Bright Elec) datasheet](docs/ob2506ncp-datasheet.pdf) (10 pp, sha256 `d0f66623d2b810db`, retrieved 2026-10-31, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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).

[Datasheet PDF](docs/ob2506ncp-datasheet.pdf)