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UC3844BNG-TUDI

Public Made by Adom

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

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Contents

README

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UC3844BNG-TUDI

Tudi · AC-DC Controllers And Regulators · DIP-8

UC3844BNG-TUDI from Tudi, in a DIP-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 for loop compensation; error amp sinks 2 mA min (7 mA typ) and sources 0.5 mA min (1.0 mA typ).
2 VFB input Error amplifier inverting input (feedback) with a 2.5 V typical input threshold; analog input limited to -0.3 to 5.5 V.
3 ISENSE input Current sense comparator input with 1.0 V typical maximum input signal; analog input limited to -0.3 to 5.5 V.
4 RT/CT passive Oscillator timing pin for external RT and CT, setting frequency (52 kHz typical at RT=10 kΩ, CT=3.3 nF) up to 500 kHz.
5 GND power_in Ground and power ground return for the IC and the output stage.
6 OUT output High-current totem-pole output driving a power MOSFET gate, rated for ±1 A output current.
7 VCC power_in Positive supply with undervoltage lockout (16 V on / 10 V off for UC3844), with an internal 30 V min zener clamp.
8 VREF power_out 5.0 V reference output (4.9 to 5.1 V) with 1 mA to 20 mA load range and -100 mA minimum short-circuit current.

Key specifications

Parameter Value
Manufacturer Tudi
Package DIP-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
Reference Output Voltage VREF 4.9 5 5.1 V TJ = 25°C, IREF = 1 mA 3
Line Regulation ΔVREF 6 20 mV 12V ≤ VCC ≤ 25 V 3
Load Regulation ΔVREF 6 25 1 mA ≤ IREF ≤ 20mA 3
Short Circuit Output Current ISC -100 -180 mA TA = 25°C 3
Oscillation Frequency f 47 52 57 KHz TJ = 25°C 3
Frequency Change with Voltage Δf/ΔVCC 0.05 1 % 12V ≤ VCC ≤ 25 V 3
Oscillator Amplitude (peak to peak) V(OSC) 1.6 V 3
Error Amp Input Bias Current IBIAS -0.1 -2 µA VFB = 3V 3
Error Amp Input Voltage VI(E.A) 2.42 2.5 2.58 V Vpin1 = 2.5V 3
Error Amp Open Loop Voltage Gain AVOL 65 90 dB 2V ≤ V0 ≤ 4V 3
Unity Gain Bandwidth UGBW 0.5 0.6 MHz Tj = 25°C, Note 3 3
Power Supply Rejection Ratio PSRR 60 70 dB 12V ≤ VCC ≤ 25 V 3
Error Amp Output Sink Current ISINK 2 7 mA Vpin2 = 2.7V, Vpin1 = 1.1V 3
Error Amp Output Source Current ISOURCE -0.5 -1 mA Vpin2 = 2.3V, Vpin1 = 5V 3
Error Amp High Output Voltage VOH 5 6 V Vpin2 = 2.3V, RL = 15KΩ to GND 3
Error Amp Low Output Voltage VOL 0.8 1.1 V Vpin2 = 2.7V, RL = 15KΩ to PIN 8 3
Current Sense Gain GV 2.85 3 3.15 V/V Note 1 & 2 3
Maximum Input Signal VI(MAX) 0.9 1 1.1 V Vpin1 = 5V (Note 1) 3
Supply Voltage Rejection SVR 70 dB 12V ≤ VCC ≤ 25 V (Note 1) 3
Current Sense Input Bias Current IBIAS -3 -10 µA Vpin3 = 3V 3
Output Low Voltage VOL 0.08 0.4 V ISINK = 20 mA 3
Output Low Voltage VOL 1.4 2.2 V ISINK = 200 mA 3
Output High Voltage VOH 13 13.5 V ISINK = 20 mA 3
Output High Voltage VOH 12 13 V ISINK = 200 mA 3
Rise Time tR 45 150 nS TJ = 25°C, CL = 1nF (Note 3) 3
Fall Time tF 35 150 nS TJ = 25°C, CL = 1nF (Note 3) 3
Undervoltage Lockout Start Threshold (UC3844) VTH(ST) 14.5 16 17.5 V UC2842/44, UC3842/44 3
Undervoltage Lockout Minimum Operating Voltage after turn-on (UC3844) VOPR(min) 8.5 10 11.5 V UC2842/44, UC3842/44 (after turn on) 3
Maximum Duty Cycle (UC3844) D(MAX) 47 48 50 % UC2844/45, UC3844/45 3
Minimum Duty Cycle D(MAX) 0 % 3
Start-Up Current IST 0.17 0.3 mA 3
Operating Supply Current ICC (OPR) 13 17 mA Vpin3 = Vpin2 = 0V 3
Zener Voltage VZ 30 38 V ICC = 25 mA 3
Supply Voltage (low impedance source) VCC 30 V Low impedance source 3
Output Current -1 1 A ±1 A as printed 3
Input Voltage (Analog Inputs pins 2,3) VI -0.3 5.5 V Pins 2, 3 3
Error Amp Output Sink Current ISINK(E.A) 10 mA 3
Power Dissipation 1 W TA = 25°C 3
Storage Temperature Range Tstg -65 150 °C 3
Lead Temperature 260 °C Soldering 5 sec 3
Operating Ambient Temperature (UC3842/43/44/45 family) TA 0 70 °C UC3842/43/44/45 characterized range 1

CAD (KiCad official)

  • Symbol: UC3844BNG-TUDI
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: DIP-8 (KiCad packages3D, STEP)
  • 3D model files: uc3844bng-tudi-etched.step / uc3844bng-tudi-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3844bng-tudi.step / uc3844bng-tudi.glb are the bare package body.

Provenance

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

  • Datasheet: Tudi datasheet (11 pp, sha256 fa001136cdaccd5a, retrieved 2026-10-15, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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