component
UC2844BDR2G
Public Made by Adomby adom
onsemi AC-DC Controllers And Regulators, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUC2844BDR2G
onsemi · AC-DC Controllers And Regulators · SOIC-14
UC2844BDR2G from onsemi, in a SOIC-14. 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 | Error Amplifier output, made available for loop compensation. |
| 2 | NC | unconnected | No connection; not internally connected. |
| 3 | Voltage Feedback | input | Inverting input of the Error Amplifier, normally connected to the switching power supply output through a resistor divider. |
| 4 | NC | unconnected | No connection; not internally connected. |
| 5 | Current Sense | input | Receives a voltage proportional to inductor current, which the PWM uses to terminate output switch conduction. |
| 6 | NC | unconnected | No connection; not internally connected. |
| 7 | RT/CT | passive | Oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground. |
| 8 | Power Ground | power_in | Separate power ground return connected back to the power source, used to reduce the effects of switching transient noise on the control circuitry. |
| 9 | GND | power_in | Control circuitry ground return, connected back to the power source ground. |
| 10 | Output | output | Directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0 A and switching at one-half the oscillator frequency. |
| 11 | VC | power_in | The output high state (VOH) is set by the voltage applied to this pin; a separate power source connection can reduce switching transient noise on the control circuitry. |
| 12 | VCC | power_in | Positive supply of the control IC. |
| 13 | NC | unconnected | No connection; not internally connected. |
| 14 | Vref | power_out | Reference output (5.0 V) that provides charging current for capacitor CT through resistor RT. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-14 |
| Category | Power Management (PMIC) |
| Pins | 14 |
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 | 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 | |||
| 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 | ||
| Maximum power dissipation, D suffix SOIC-14 | PD | 862 | mW | TA = 25°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 and temperature | Vref | 4.9 | 5.1 | V | 2 | ||
| Output short circuit current | ISC | -30 | -85 | -180 | mA | 2 | |
| Oscillator frequency (TJ = 25°C) | fOSC | 49 | 52 | 55 | kHz | TJ = 25°C | 2 |
| Oscillator frequency (TA = Tlow to Thigh) | fOSC | 48 | 56 | kHz | TA = Tlow to Thigh | 2 | |
| Oscillator 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 (TJ = 25°C) | Idischg | 7.8 | 8.3 | 8.8 | mA | VOSC = 2.0 V, TJ = 25°C | 3 |
| Discharge current (TA = Tlow to Thigh, UC284XB) | 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 |
| 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 | |
| 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 (latch trip point, VFB = 0 V) | 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 | 15 | 16 | 17 | V | UCX844B | 3 |
| Minimum operating voltage after turn-on | VCC(min) | 9 | 10 | 11 | V | UCX844B | 3 |
| Duty cycle maximum | DC(max) | 47 | 48 | 50 | % | UC284XB, UC384XB | 4 |
| Duty cycle minimum | DC(min) | 0 | % | 4 | |||
| Power supply current, startup | ICC | 0.3 | 0.5 | mA | Startup (VCC = 6.5 V for UCX845B; VCC = 14 V for UCX844B) | 4 | |
| Power supply current, operating | ICC | 12 | 17 | mA | Note 11 | 4 | |
| Power supply zener voltage | VZ | 30 | 36 | V | ICC = 25 mA | 4 | |
| Temperature stability | TS | 0.2 | mV/°C | 2 | |||
| Frequency change with temperature | fOSC/T | 1 | % | TA = Tlow to Thigh | 2 | ||
| Oscillator voltage swing (peak-to-peak) | VOSC | 1.6 | V | 2 | |||
| Output noise voltage | Vn | 50 | V | f = 10 Hz to 10 kHz, TJ = 25°C | 2 | ||
| Long term stability | S | 5 | mV | TA = 125°C for 1000 Hours | 2 | ||
| Power supply rejection ratio (current sense) | PSRR | 70 | dB | VCC = 12 V to 25 V, Note 9 | 3 | ||
| Thermal resistance, junction-to-air, D suffix SOIC-14 | RθJA | 145 | °C/W | 2 |
CAD (KiCad official)
- Symbol:
UC2844BDR2G - Footprint:
Package_SO:SOIC-14_3.9x8.7mm_P1.27mm - 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files:
uc2844bdr2g-etched.step/uc2844bdr2g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc2844bdr2g.step/uc2844bdr2g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (19 pp, sha256
e69ff39fc0ea9e08, retrieved 2026-10-20, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).