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UC2845BD

Public Made by Adom

by adom

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

componentpower management (pmic)uc2845bdfactory-2.0.0extractor-text
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Contents

README

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UC2845BD

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

UC2845BD from lingxingic, 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 output Error amplifier output (比较端) that the datasheet specifies with a sink current capability of 2 to 12 mA and a limit of 10 mA for the error amplifier output sink current.
2 VFB input Negative feedback input (负反馈) of the error amplifier, with a 2.50 V reference (2.42 to 2.58 V) and an input bias current of -0.1 to -2 µA at VFB = 5 V.
3 ISENSE input Current sense input (电流灵敏度) with a current-sense gain of 3 V/V (2.85 to 3.15 V/V) and a maximum input signal of 0.9 to 1.1 V.
4 RT/CT passive Oscillator timing pin (振荡端); with RT = 10 kΩ and CT = 3.3 nF the datasheet gives an oscillator frequency of 49 to 55 kHz (52 kHz typical) at Tj = 25 ℃.
5 GROUND power_in Ground (地) reference pin for the controller.
6 OUTPUT output Push-pull output (输出) that can source or sink large currents to drive a MOSFET power device, with an output current rating of ±1 A.
7 Vi power_in Supply pin (电源) with a 30 V maximum rating from a low-impedance source; for the UC2845 the undervoltage lockout is 8.8 V turn-on and 7.6 V turn-off.
8 VREF power_out Reference voltage (参考电压) output of 5.00 V (4.90 to 5.10 V) at Io = 1 mA, with an output short-circuit current of -30 to -180 mA.

Key specifications

Parameter Value
Manufacturer lingxingic
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（低阻抗源） Vi 30 V 6
输出电流 IO -1 1 A 6
误差放大器输出端灌电流 Isink(EA) 10 mA 6
模拟输入范围 Vin(EA) -0.3 6.3 V 6
热阻 SOP8 θJA 160 ℃/W JEDEC 2S2P, SOP8 (single printed value) 6
工作温度 Tamb -40 125 ℃ 6
存储温度 Tstg -65 150 ℃ 6
焊接温度 TL 260 ℃ 10 s, SOP8 6
VREF 输出电压 VREF 4.9 5 5.1 V Io=1mA，Tj=25℃ 6
线性调整率 ∆VREF 2 20 mV 12V≤Vi≤25V 6
负载调整率 ∆VREF 3 25 mV 1≤Io≤20mA 6
总输出变化率 4.7 5.3 V line, load, temperature 6
输出短路电流 ISC -30 -100 -180 mA 注 4 6
振荡器频率 (Tj=25℃) fOSC 49 52 55 kHz Tj=25℃ 6
振荡器频率 (Tamb=-40～125℃) fOSC 47 57 kHz Tamb=-40～125℃ 6
振荡器频率 (RT/CT 测试条件) fOSC 225 250 275 kHz Tj=25℃ (RT=6.2kΩ，CT=1nF) 6
频率的电压稳定性 ∆fOSC/∆V 0.2 1 % Vi=12V～25V 6
放电电流 Idischg 7.6 8.3 9 mA VOSC=2V; Tj=25℃ 6
误差放大器输入电压 V2 2.42 2.5 2.58 V VPIN1=2.5V 6
输入偏置电流 (误差放大器) Ib -0.1 -2 uA VFB=5V 6
开环电压增益 AVOL 65 90 dB 2V≤Vo≤4V 6
单位增益带宽 BW 0.7 1 MHz Tj=25℃ 注 4 6
电源抑制比 (误差放大器) PSRR 60 70 dB 12V≤Vi≤25V 7
输出灌电流 IO 2 12 mA VPIN2=2.7V，VPIN1=1.1V 7
输出拉电流 IO -0.5 -1 mA VPIN2=2.3V，VPIN1=5V 7
输出高电平 VOUT High 5 6.2 V VPIN2=2.3V；RL=15KΩ to ground 7
输出低电平 VOUT Low 0.8 1.1 V VPIN2=2.7V；RL=15KΩ to PIN 8 7
电流传感器增益 GV 2.85 3 3.15 V/V 注 5、6 7
最大输入信号 V3 0.9 1 1.1 V VPIN1=5V（注 5） 7
电流传感器电源抑制比 SVR 70 dB 12V≤Vi≤25V（注 5） 7
输入偏置电流 (电流传感器) Ib -2 -10 uA 7
传输延迟 150 300 ns 注 4 7
输出低电平 (Isink=20mA) VOL 0.1 0.4 V Isink=20mA 7
输出低电平 (Isink=200mA) VOL 1.6 2.2 V Isink=200mA 7
输出高电平 (Isource=20mA) VOH 13 13.5 V Isource=20mA 7
输出高电平 (Isource=200mA) VOH 12 13.5 V Isource=200mA 7
欠压锁存饱和压降 VOLS 0.1 1.1 V Vi=6V，ISINK=1mA 7
上升时间 tr 50 150 ns CL=1nF（注 4） 7
下降时间 tf 50 150 ns CL=1nF（注 4） 7
开启阈值电压 (UC2843/UC2845 行) VTH(ST) 7.8 8.8 9.5 V 7
维持工作的最小电压 (UC2843/UC2845 行) VOPR(MIN) 7 7.6 8.4 V 7
最大占空比 (UC2844/UC2845 行) 47 48 50 % 7
最小占空比 0 % 7
启动电流 Ist 0.3 1 mA 7
工作时电源电流 Ii 12 20 mA VPIN2=VPIN3=0V 7
齐纳管电压 Viz 30 36 V Ii=25mA 7
线性调整率温度系数 (VREF) ∆VREF/∆T 0.25 mV/℃ 注 4 6
频率的温度稳定性 ∆fOSC/∆T 0.55 % Tamb=-40～125℃（注 4） 6
振荡幅度 (peak to peak) VOSC 1.6 V 6

CAD (KiCad official)

  • Symbol: UC2845BD
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: uc2845bd-etched.step / uc2845bd-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc2845bd.step / uc2845bd.glb are the bare package body.

Provenance

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

  • Datasheet: lingxingic datasheet (11 pp, sha256 065498dc909cbc66, retrieved 2026-10-18, 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