component

UC2844BNG

Public Made by Adom

by adom

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

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UC2844BNG

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

UC2844BNG from onsemi, 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 Compensation output This pin is the Error Amplifier output and is made available for loop compensation.
2 Voltage Feedback input This is the inverting input of the Error Amplifier and is normally connected to the switching power supply output through a resistor divider.
3 Current Sense input A voltage proportional to inductor current is connected to this input, and the PWM uses it to terminate the output switch conduction.
4 RT/CT passive Resistor RT connects to Vref and capacitor CT connects to ground to program the oscillator frequency and maximum output duty cycle; oscillator operation to 1.0 kHz is possible.
5 GND power_in This pin is the combined control circuitry and power ground.
6 Output output This output directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0 A, and switches at one-half the oscillator frequency.
7 VCC power_in This pin is the positive supply of the control IC.
8 Vref power_out This is the reference output, which provides charging current for capacitor CT through resistor RT.

Key specifications

Parameter Value
Manufacturer onsemi
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
Bias and Driver Voltages (VCC, VC) VCC, VC 36 V Zero series impedance (Note 1) 2
Total Power Supply and Zener Current 30 mA ICC + IZ 2
Output Current, Source or Sink IO 1 A Note 2 2
Output Energy (Capacitive Load per Cycle) W 5 J 2
Current Sense and Voltage Feedback Inputs Vin -0.3 5.5 V 2
Error Amp Output Sink Current IO 10 mA 2
Maximum Power Dissipation, N Suffix PDIP-8 PD 1.25 W TA = 25°C, N suffix Case 626 2
Operating Junction Temperature TJ 150 °C 2
Operating Ambient Temperature TA -25 85 °C UC2844B, UC2845B 2
Storage Temperature Range Tstg -65 150 °C 2
Thermal Resistance, Junction-to-Air, N Suffix PDIP-8 RJA 100 °C/W N suffix Case 626 2
Reference Output Voltage Vref 4.95 5 5.05 V IO = 1.0 mA, TJ = 25°C 2
Line Regulation Regline 2 20 mV VCC = 12 V to 25 V 2
Load Regulation Regload 3 25 mV IO = 1.0 mA to 20 mA 2
Total Output Variation over Line, Load, & Temperature Vref 4.9 5.1 V 2
Output Short Circuit Current ISC -30 -85 -180 mA 2
Oscillator Frequency fOSC 49 52 55 kHz TJ = 25°C 2
Oscillator Frequency fOSC 48 56 kHz TA = Tlow to Thigh 2
Oscillator Frequency fOSC 225 250 275 kHz TJ = 25°C (RT = 6.2 k, CT = 1.0 nF) 2
Frequency Change with Voltage fOSC/V 0.2 1 % VCC = 12 V to 25 V 2
Discharge Current Idischg 7.8 8.3 8.8 mA VOSC = 2.0 V; TJ = 25°C 3
Discharge Current Idischg 7.5 8.8 mA VOSC = 2.0 V; TA = Tlow to Thigh (UC284XB, UC384XB) 3
Voltage Feedback Input VFB 2.45 2.5 2.55 V VO = 2.5 V 3
Input Bias Current IIB -0.1 -1 µA VFB = 5.0 V 3
Open Loop Voltage Gain AVOL 65 90 dB VO = 2.0 V to 4.0 V 3
Unity Gain Bandwidth BW 0.7 1 MHz TJ = 25°C 3
Power Supply Rejection Ratio (Error Amp) PSRR 60 70 dB VCC = 12 V to 25 V 3
Output Current - Sink ISink 2 12 mA VO = 1.1 V, VFB = 2.7 V 3
Output Current - Source ISource -0.5 -1 mA VO = 5.0 V, VFB = 2.3 V 3
Output Voltage High State VOH 5 6.2 V RL = 15 k to ground, VFB = 2.3 V 3
Output Voltage Low State VOL 0.8 1.1 V RL = 15 k to Vref, VFB = 2.7 V (UC284XB, UC384XB) 3
Current Sense Input Voltage Gain AV 2.85 3 3.15 V/V Notes 9 & 10 3
Maximum Current Sense Input Threshold Vth 0.9 1 1.1 V Note 9: measured at latch trip point with VFB = 0 V 3
Input Bias Current (Current Sense) IIB -2 -10 µA 3
Propagation Delay (Current Sense Input to Output) tPLH(In/Out) 150 300 ns 3
Output Voltage Low State VOL 0.1 0.4 V ISink = 20 mA 3
Output Voltage Low State VOL 1.6 2.2 V ISink = 200 mA (UC284XB, UC384XB) 3
Output Voltage High State VOH 13 13.5 V ISource = 20 mA (UC284XB, UC384XB) 3
Output Voltage High State VOH 12 13.4 V ISource = 200 mA 3
Output Voltage with UVLO Activated VOL(UVLO) 0.1 1.1 V VCC = 6.0 V, ISink = 1.0 mA 3
Output Voltage Rise Time tr 50 150 ns CL = 1.0 nF, TJ = 25°C 3
Output Voltage Fall Time tf 50 150 ns CL = 1.0 nF, TJ = 25°C 3
Startup Threshold (UCX844B) Vth 15 16 17 V UCX844B 3
Minimum Operating Voltage After Turn-On (UCX844B) VCC(min) 9 10 11 V UCX844B 3
Maximum Duty Cycle DC(max) 47 48 50 % Maximum (UC284XB, UC384XB) 4
Minimum Duty Cycle DC(min) 0 % Minimum 4
Power Supply Current, Startup ICC 0.3 0.5 mA VCC = 6.5 V for UCX845B; VCC = 14 V for UCX844B, BV 4
Power Supply Current, Operating ICC 12 17 mA Note 11 4
Power Supply Zener Voltage VZ 30 36 V ICC = 25 mA 4

CAD (KiCad official)

  • Symbol: UC2844BNG
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: DIP-8 (KiCad packages3D, STEP)
  • 3D model files: uc2844bng-etched.step / uc2844bng-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc2844bng.step / uc2844bng.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (19 pp, sha256 e69ff39fc0ea9e08, retrieved 2026-10-15, tier: lcsc)
  • 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