component
oc5228
Public Unreviewedby Ray
OCX Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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README
markdownOC5228
OCX · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOP-8
OC5228 from OCX, in a SOP-8. 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 | LD | input | Analog / segmented dimming control input. Floating = full brightness (high mode); tied to VDD = 1/2 current low-brightness mode; 0.2V-1.2V analog input sets output current (linear analog dimming); below 0.2V shuts output off. Can also accept PWM with high level > 1.2V. Internal 20uA pull-down (ILD_F) supports segmented dimming. |
| 2 | PWM | input | PWM dimming input. High level enables output, low disables it; supports ultra-small duty ratios with a minimum response pulse width of 60ns. Rising threshold VPWM_H = 1.4V typ, falling VDIM_L = 0.8V typ. Pin floats to logic-high (output enabled) by default. |
| 3 | VDD | power_in | Chip supply pin. Powered via an external bleeder resistor R3 from VIN; internally clamped by a 5.5V shunt (VDDCLAMP typ 5.5V, IDDCLAMP max 10mA). Startup occurs when VDD reaches ~4.1V. Requires >=1.0uF bypass capacitor placed close to the pin. Operating current IDD ~2.5mA at VDD = 5.5V; quiescent IVDDQ ~1.2mA. |
| 4 | CS | input | Current-sense input. Connects to the source-side sense resistor Rcs; output current is regulated to Iout = 0.2V / Rcs. Constant-current reference VREF = 200mV typ (192-208mV); over-current threshold VCS = 216-264mV. Leading-edge blanking TLEB = 120ns typ. Absolute max VCS = -0.3 to 7.0V. |
| 5 | D | output | Drain of the internal 100V / 2A power MOSFET (switching node). RDS(on) = 200 mOhm typ at VGS = 5.5V; VDS rating 100V. Pins 5 and 6 are tied together internally and both must be connected to the inductor / freewheel-diode switch node. |
| 6 | D | output | Drain of the internal 100V / 2A power MOSFET (switching node), tied to pin 5. Connect both D pins together to the inductor / catch-diode node to share switch current. |
| 7 | GND | power_in | Device ground / power return. Pins 7 and 8 are both GND and should be tied together to the system ground plane close to the CS sense resistor to minimize sense-loop noise. |
| 8 | GND | power_in | Device ground / power return, tied to pin 7. Provides the return for internal control and MOS driver. Both GND pins must be connected on the board. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | OCX |
| Package | SOP-8 |
| Category | PMIC |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
OC5228 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: OCX datasheet (None pp, sha256
1fb6ab4263618d59, retrieved 2026-08-17, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).
Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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