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UC3844AN-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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UC3844AN-TUDI

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

UC3844AN-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, made for loop compensation.
2 VFB input Inverting input of the Error Amplifier, normally connected to the switching power supply output through a resistor divider (analog input range -0.3 to 5.5 V).
3 ISENSE input Input for a voltage proportional to inductor current, which the PWM uses to terminate output switch conduction (analog input range -0.3 to 5.5 V).
4 RT/CT passive Oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground.
5 GND power_in Combined control circuitry and power ground.
6 OUT output Directly drives the gate of a power MOSFET, with peak currents up to 1 A sourced and sunk (absolute maximum output current ±1 A).
7 VCC power_in Positive supply of the integrated circuit, absolute maximum 30 V.
8 VREF power_out Reference output that provides charging current for capacitor CT through resistor RT; 5.0 V typical.

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 mV 1 mA ≤ IREF ≤ 20mA, TA = 25°C 3
Short Circuit Output Current ISC -100 -180 mA 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
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
Output Sink Current ISINK 2 7 mA Vpin2 = 2.7V, Vpin1 = 1.1V 3
Output Source Current ISOURCE -0.5 -1 mA Vpin2 = 2.3V, Vpin1 = 5V 3
High Output Voltage VOH 5 V Vpin2 = 2.3V, RL = 15KΩ to GND 3
High Output Voltage VOH 6 V Vpin2 = 2.7V, RL = 15KΩ to PIN 8 3
Low Output Voltage VOL 0.8 1.1 V 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
Low Output Voltage (20 mA sink) VOL 0.08 0.4 V ISINK = 20 mA 3
Low Output Voltage (200 mA sink) VOL 1.4 2.2 V ISINK = 200 mA 3
High Output Voltage (20 mA sink) VOH 13 13.5 V ISINK = 20 mA 3
High Output Voltage (200 mA sink) 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
Start Threshold VTH(ST) 14.5 16 17.5 V 3
Min. Operating Voltage (After Turn On) VOPR(min) 8.5 10 11.5 V After Turn On 3
Max. Duty Cycle D(MAX) 47 48 50 % 3
Min. Duty Cycle D(MIN) 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 2
Output Current IO -1 1 A 2
Input Voltage (Analog Inputs pins 2,3) VI -0.3 5.5 V Analog inputs pins 2, 3 2
Error Amp Output Sink Current ISINK(E.A) 10 mA 2
Power Dissipation PD 1 W TA = 25°C 2
Storage Temperature Range Tstg -65 150 °C 2
Lead Temperature (soldering 5 sec) TL 260 °C Soldering 5 sec 2
Ambient Operating Temperature Range TA 0 70 °C Electrical characteristics test range (TA = 0°C to +70°C) 3

CAD (KiCad official)

  • Symbol: UC3844AN-TUDI
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: DIP-8 (KiCad packages3D, STEP)
  • 3D model files: uc3844an-tudi-etched.step / uc3844an-tudi-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3844an-tudi.step / uc3844an-tudi.glb are the bare package body.

Provenance

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

  • Datasheet: Tudi datasheet (11 pp, sha256 c398bd9771df4e2a, 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