component
U322
Public Made by Adomby adom
UNI SEMIC DC-DC Converters, SOP-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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README
markdownU322
UNI SEMIC · DC-DC Converters · SOP-8
U322 from UNI SEMIC, 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 | VDD | power_in | Chip power supply pin, which also serves as the output voltage feedback input when FB is left floating; a 1uF ceramic capacitor is recommended on VDD. |
| 2 | GND | power_in | Chip reference ground. |
| 3 | NC | unconnected | Non-functional pin; leave floating in application. |
| 4 | FB | input | Feedback input pin; when left floating the output defaults to 12.5 V. |
| 5 | CS | input | Peak current sense pin, used to sample the inductor current and set the peak current threshold (left floating, the default limit is 1.2 A). |
| 6 | GATE | output | Drive output for the external power MOSFET. |
| 7 | NC | unconnected | Non-functional pin; leave floating in application. |
| 8 | HV | power_in | Internal high-voltage start-up and supply pin, which draws charge from the high-voltage input to charge VDD. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UNI SEMIC |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| 内部差分放大器输入端基准 (VFB_REF) | VFB_REF | 1.97 | 2 | 2.03 | V | 7 | |
| HV 脚供电电流 | IHV | 1 | 2 | mA | HV=150V, VDD=0V | 6 | |
| HV 脚漏电电流 | IHV_leakage | 10 | uA | HV=150V, VDD=12V | 6 | ||
| VDD 启动电流 | IVDD_st | 100 | 300 | uA | 无开关工作 | 6 | |
| 典型最短关断时间 (TOFF_min_norm) | TOFF_min_norm | 14.5 | 16 | 17.5 | us | 7 | |
| HV 管脚电压 | -0.3 | 200 | V | 6 | |||
| VDD 供电电压 | 30 | V | 6 | ||||
| VDD 箝位电流 | 10 | mA | 6 | ||||
| FB，CS，GATE 管脚电压 | -0.3 | 7 | V | 6 | |||
| 最高芯片工作结温 | 160 | °C | 6 | ||||
| 储藏温度 | -65 | 150 | °C | 6 | |||
| 管脚温度 (焊接) | 260 | °C | 焊接 10 秒 | 6 | |||
| ESD 能力 (人体模型) | 3 | KV | 6 | ||||
| ESD 能力 (机器模型) | 250 | V | 6 | ||||
| 工作环境温度 | -40 | 125 | °C | 6 | |||
| 开关频率 | 40 | 60 | kHz | 6 | |||
| 封装热阻---结到环境(SOP-8) | 165 | °C/W | 6 | ||||
| VDD 调制电压 | VDD_Reg1 | 12.5 | V | FB 悬空 | 6 | ||
| VDD 工作电流 | IVDD_Op | 800 | uA | Fsw=60kHz | 6 | ||
| VDD 静态电流 | IVDD_Q | 200 | uA | 6 | |||
| VDD 过压保护阈值 | VDD_OVP | 28 | V | 6 | |||
| VDD 钳位电压 | VDD_Clamp | 30 | V | IVDD=10mA | 6 | ||
| 输出过压保护 (OVP) 检测阈值 | VFB_OVP | 2.4 | V | 7 | |||
| 输出过载保护 (OLP) 检测阈值 | VFB_OLP | 1.87 | V | 7 | |||
| 过载保护延迟时间 | TD_OLP | 100 | ms | 7 | |||
| 前沿消隐 | TLEB | 350 | ns | 7 | |||
| 过流比较器延时 | TD_OCP | 100 | ns | 7 | |||
| 峰值电流阈值 | VIPK | 0.3 | V | 7 | |||
| 异常过流保护检测阈值 | VAOCP | 0.6 | V | 7 | |||
| 典型最长关断时间 | TOFF_max_norm | 1.4 | ms | 7 | |||
| 动态响应模式下最长关断时间 | TOFF_max_FDR | 420 | us | 7 | |||
| 最长导通时间 | TON_max | 12 | us | 7 | |||
| 内部软启动时间 | Tss | 3 | ms | 7 | |||
| 自动恢复延迟时间 | TAuto_Recovery | 500 | ms | 7 | |||
| 过热保护阈值 | TSD | 150 | °C | 7 |
CAD (KiCad official)
- Symbol:
U322 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
u322-etched.step/u322-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);u322.step/u322.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UNI SEMIC datasheet (13 pp, sha256
5a2395cd567a1842, retrieved 2026-10-09, 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: 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).