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UC2845BM

Public Made by Adom

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

componentpower management (pmic)uc2845bmfactory-2.0.0extractor-text
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Contents

README

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UC2845BM

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

UC2845BM 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 terminal; pulling this pin below two diode drops shuts down the controller and forces the PWM output high until the shutdown condition is removed.
2 VFB input Error amplifier input (voltage-feedback node) with a recommended input voltage range of 0 to 5.0 V.
3 ISENSE input Current-sense comparator input whose maximum input signal is 1.0 V (typ.), so peak sense current is set as Ismax = 1.0 V / Rs; raising it above 1 V shuts down the output.
4 RT/CT bidirectional RC oscillator timing input with a recommended voltage range of 0 to 5.0 V and an oscillation frequency range of 100 kHz to 500 kHz.
5 GND power_in Power ground; the datasheet requires the bypass capacitor to be placed close to pin 5 because of high peak currents when driving capacitive loads.
6 OUTPUT output PWM totem-pole output for driving an N-channel MOSFET, rated for ±1 A peak output current and 200 mA average output current, and held low when off; pin 6 needs a divider to GND during undervoltage lockout to prevent leakage from turning the power switch on.
7 VCC power_in Supply pin with a maximum recommended supply voltage of 28 V and an absolute maximum of 30 V, with start-up current below 0.5 mA and a 34 V (typ.) Zener clamp at 25 mA.
8 VREF power_in Internally trimmed 5.00 V (4.95 V to 5.05 V at 25 °C) reference output, capable of sourcing up to 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 850 mW Tamb≤25°C 3
结对环境热阻 RthJA 143 °C /W 3
结壳（上）热阻 RthJC 47.6 °C /W 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 人体模式（25°C） 3
ESD 充电器件模式 ESD-CDM -500 500 V 充电器件模式（25°C） 3
引脚温度（焊接 10s） TLEAD 245 °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 85 °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=1 mA ~20 mA 4
温度稳定性 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 f 49 52 55 kHz Ta=25°C 4
电压稳定性 ∆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 Vpin1=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 (误差放大器) VOH 5 6.2 V Vpin 2=2.3V，RL=15kΩ to GND 4
输出低电平 (误差放大器) 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 note1，2 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 to 2V 4
输出低电平 VOL 0.1 0.4 V Isink=20mA 4
输出低电平 VOL 1.6 2.2 V Isink=200mA 4
输出高电平 VOH 13 13.5 V Isource=20mA 4
输出高电平 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) 47 48 50 % 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

CAD (KiCad official)

  • Symbol: UC2845BM
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: uc2845bm-etched.step / uc2845bm-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc2845bm.step / uc2845bm.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (11 pp, sha256 bf9615dc0d4e1097, retrieved 2026-10-17, 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: 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