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UC2843BM

Public Made by Adom

by adom

HGSEMI AC-DC Controllers And Regulators, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management (pmic)uc2843bmfactory-2.0.0extractor-text
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Contents

README

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UC2843BM

HGSEMI · AC-DC Controllers And Regulators · SOP-8

UC2843BM from HGSEMI, 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 COMP bidirectional Error amplifier compensation node; the error amplifier can sink up to 10 mA (absolute maximum rating), and pulling this pin below two diode drops shuts the controller down.
2 VFB input Error amplifier inverting input, regulated to a 2.5 V reference (VI(EA) 2.42 V to 2.58 V) with input bias current of -0.1 µA typical and -2 µA maximum.
3 ISENSE input Current-sense comparator input with a maximum input signal of 0.9 V to 1.1 V (1 V typical) and an analog input absolute range of -0.3 V to +5.5 V; raising it above 1 V shuts the output off.
4 RT/CT bidirectional RC oscillator timing input, with a recommended switching frequency range of 100 kHz to 500 kHz and an oscillator amplitude of about 1.6 V peak-to-peak.
5 GND power_in Power ground; the supply bypass capacitor should be placed close to this pin to handle high peak currents from capacitive loads.
6 OUTPUT output PWM totem-pole output for driving an N-channel MOSFET, held low when off, with output current limited to ±1 A (absolute maximum) and 200 mA average; it is driven to high impedance during undervoltage lockout and needs a divider to GND to prevent leakage from turning on the power switch.
7 VCC power_in Supply pin with a recommended maximum of 28 V (absolute maximum 30 V), a startup current below 0.5 mA, and a 34 V typical Zener clamp at 25 mA.
8 VREF power_in Internally trimmed 5.00 V reference output (4.95 V to 5.05 V at 1 mA, 25 °C) with a maximum reference output current of -20 mA.

Key specifications

Parameter Value
Manufacturer HGSEMI
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
电源电压 Vcc 30 V 3
输出电流 Io -1 1 A 3
模拟输入（2，3 脚） VI(ANA) -0.3 5.5 V 3
误差放大器输出灌电流 ISINK(EA) 10 mA 3
耗散功率 PD 1 W Tamb≤25°C 3
结温 TJ 150 °C 3
存储温度 Tstg -65 150 °C 3
闩锁 LU 100 mA 25°C&125°C 3
ESD 人体模式 ESD-HBM -2000 2000 V 25°C 3
ESD 充电器件模式 ESD-CDM -500 500 V 25°C 3
引脚温度（焊接 10s） TLEAD 260 °C 焊接 10s 3
电源电压 VCC 28 V 3
输入电压 RT/CT、VFB、ISENSE VI 0 5 V 3
输出电压 VO 0 28 V 3
电源电流 ICC 25 mA 3
平均输出电流 Io 200 mA 3
基准输出电流 Io(ref) -20 mA 3
振荡频率 fosc 100 500 kHz 3
正常工作环温 Ta -40 105 °C 3
输出电压（基准） VREF 4.95 5 5.05 V Ta=25°C，IL=1mA 4
线性调整率 ∆VREF1 6 20 mV VCC=12V~25V 4
负载调整率 ∆VREF2 6 25 mV IL=1mA~20mA 4
温度稳定性（基准） TS 0.2 0.4 mV/°C 4
总的输出变化 ∆VREF3 4.82 5.18 V Line，Load，Temp 4
长期稳定性 S 5 25 mV Ta=25°C，1000 小时 4
输出短路电流 ISC -30 -100 -180 mA VREF=0V，Ta=25°C 4
初始精度（振荡器） f 49 52 55 kHz Ta=25°C 4
电压稳定性（振荡器） ∆f/∆VCC 0.2 1 % VCC=12V~25V 4
放电电流 Idischg 7.5 8.8 mA VOSC=2V 4
输入电压（误差放大器） VI(EA) 2.42 2.5 2.58 V Vpin 1=2.5V 4
输入偏置电流（误差放大器） IBIAS -0.1 -2 µA 4
开环电压增益 AVOL 60 90 dB 2≤Vo≤4V 4
单位增益带宽 BW 0.7 1 MHz Ta=25°C 4
电源电压抑制比（误差放大器） PSRR 60 70 dB 12≤Vcc≤25V 4
输出灌电流 Isink 2 12 mA Vpin 2=2.7V，Vpin 1=1.1V 4
输出拉电流 Isource -0.5 -1 mA Vpin 2=2.3V，Vpin 1=5V 4
输出高电平（Vout） VOH 5 6.2 V Vpin 2=2.3V，RL=15kΩ to GND 4
输出低电平（Vout） VOL 0.8 1.1 V Vpin 2=2.7V，RL=15kΩ to VREF 4
增益 GV 2.85 3 3.15 V/V 注 1，2 4
最大输入信号 VI(MAX) 0.9 1 1.1 V Vpin 1=5V（注 1） 4
输入偏置电流（电流采样） IBIAS -2 -10 µA 4
输出延迟 TPLH 150 300 ns Vpin 3=0~2V 4
输出低电平（Isink=20mA） VOL 0.1 0.4 V Isink=20mA 4
输出低电平（Isink=200mA） VOL 1.6 2.2 V Isink=200mA 4
输出高电平（Isource=20mA） VOH 13 13.5 V Isource=20mA 4
输出高电平（Isource=200mA） VOH 12 13.5 V Isource=200mA 4
上升时间 tR 50 150 ns Ta=25°C，CL=1nF 4
下降时间 tF 50 150 ns Ta=25°C，CL=1nF 4
UVLO 低电平输出饱和压降 VOL(UVLO) 0.7 1.2 V Vcc=5V，Isink=1mA 5
启动阈值 VTH(ST) 7.8 8.4 9 V 5
开启后最小工作电压 VOPR(min) 7 7.6 8.2 V 5
最小占空比 D(MIN) 0 % 5
最大占空比 D(MAX) 94 96 100 % 5
启动电流 IST 0.3 0.5 mA 5
工作电流 ICC(opr) 12 17 mA Vpin 2=Vpin 3=0V 5
Vcc 齐纳电压 Vz 30 34 V Icc=25mA 5
结对环境热阻 RthJA 100.9 °C/W 3
结壳（上）热阻 RthJC 41.4 °C/W 3

CAD (KiCad official)

  • Symbol: UC2843BM
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: uc2843bm-etched.step / uc2843bm-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc2843bm.step / uc2843bm.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (11 pp, sha256 2c475c66553f62aa, retrieved 2026-10-19, 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF