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UC2845BNG

Public Made by Adom

by adom

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

componentpower management (pmic)uc2845bngfactory-2.0.0extractor-text
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UC2845BNG

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

UC2845BNG from onsemi, in a PDIP-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; the Current Sense and Voltage Feedback inputs are rated Vin −0.3 V to +5.5 V.
3 Current Sense input A voltage proportional to inductor current is connected to this input, which the PWM uses to terminate output switch conduction; the input is rated Vin −0.3 V to +5.5 V.
4 RT/CT passive The oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground, and 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; bias and driver voltages VCC and VC are rated up to 36 V (zero series impedance, see Total Device spec).
8 Vref power_out This is the reference output (5.0 V nominal, 4.9 V to 5.1 V over line, load and temperature for UC284xB/UC384xB) that provides charging current for capacitor CT through resistor RT.

Key specifications

Parameter Value
Manufacturer onsemi
Package PDIP-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 (Zero Series Impedance) VCC, VC 36 V Zero series impedance (Note 1) 2
Total Power Supply and Zener Current ICC + IZ 30 mA 2
Output Current, Source or Sink IO 1 A Source or sink (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 2
Thermal Resistance, Junction-to-Air, N Suffix PDIP-8 RJA 100 °C/W 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
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
Frequency fOSC 49 52 55 kHz TJ = 25°C 2
Frequency, TA = Tlow to Thigh fOSC 48 56 kHz TA = Tlow to Thigh 2
Frequency (RT = 6.2 k, CT = 1.0 nF) 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, TA = Tlow to Thigh Idischg 7.5 8.8 mA VOSC = 2.0 V, TA = Tlow to Thigh (UC284XB) 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
Error Amp Output Voltage Swing, High State VOH 5 6.2 V RL = 15 k to ground, VFB = 2.3 V 3
Error Amp Output Voltage Swing, Low State VOL 0.8 1.1 V RL = 15 k to Vref, VFB = 2.7 V 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 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 Vth 7.8 8.4 9 V UCX845B 3
Minimum Operating Voltage After Turn-On VCC(min) 7 7.6 8.2 V UCX845B 3
Power Supply Current, Startup ICC 0.3 0.5 mA VCC = 6.5 V for UCX845B 4
Power Supply Current, Operating ICC 12 17 mA Note 11 4
Power Supply Zener Voltage VZ 30 36 V ICC = 25 mA 4
Duty Cycle, Maximum DC(max) 47 48 50 % UC284XB 4
Duty Cycle, Minimum DC(min) 0 % 4

CAD (KiCad official)

  • Symbol: UC2845BNG
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: PDIP-8 (KiCad packages3D, STEP)
  • 3D model files: uc2845bng-etched.step / uc2845bng-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc2845bng.step / uc2845bng.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 2026-10-18, 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