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UC2843BG-S08-R
Public Made by Adomby adom
UTC(Unisonic Tech) DC-DC Controllers, SOP-8. 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
markdownUC2843BG-S08-R
UTC(Unisonic Tech) · DC-DC Controllers · SOP-8
UC2843BG-S08-R from UTC(Unisonic Tech), in a SOP-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 available for loop compensation; the error amplifier can source or sink up to 0.5mA. |
| 2 | VFB | input | Inverting input of the Error Amplifier, normally connected to the power supply output through a resistor divider (analog input -0.3 to +6.3V absolute max). |
| 3 | ISENSE | input | Current-sense input where a voltage proportional to inductor current is applied and the PWM uses it to terminate output switch conduction (shutdown above 1V; -0.3 to +6.3V absolute max). |
| 4 | RT/CT | passive | Oscillator timing pin: frequency and maximum output duty cycle are set by resistor RT to VREF and capacitor CT to ground, with operation to 500 kHz possible. |
| 5 | GND | power_in | Combined control circuitry and power ground. |
| 6 | OUTPUT | output | Totem-pole output directly driving the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0A. |
| 7 | VCC | power_in | Positive supply of the control IC, rated up to 30V maximum with UVLO start threshold of 8.4V typ and 7.6V typ turn-off. |
| 8 | VREF | power_out | 5V reference output (5V typ) that provides charging current for capacitor CT through resistor RT, with recommended reference output current of -20mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC(Unisonic Tech) |
| Package | SOP-8 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply Voltage (Low impedance source) | VCC | 30 | V | TA=25°C | 4 | ||
| Analog Input Voltage (VFB and ISENSE) | VIN | -0.3 | 6.3 | V | TA=25°C | 4 | |
| Supply Current | ICC | 30 | mA | TA=25°C | 4 | ||
| Error Amplifier Output Sink Current | IO(SINK) | 10 | mA | TA=25°C | 4 | ||
| Output Current | IOUT | -1 | 1 | A | TA=25°C | 4 | |
| Power Dissipation SOP-8 | PD | 800 | mW | SOP-8 | 4 | ||
| Output Energy (Capacitive load) | W | 5 | μJ | TA=25°C | 4 | ||
| Junction Temperature | TJ | 150 | °C | 4 | |||
| Operating Temperature | TOPR | -40 | 85 | °C | 4 | ||
| Storage Temperature | TSTG | -65 | 150 | °C | 4 | ||
| Thermal Resistance Junction to Ambient SOP-8 | θJA | 156 | C/W | SOP-8 | 4 | ||
| Supply Voltage | VCC | 30 | V | 4 | |||
| Input Voltage RT/CT | VIN | 0 | 5.5 | V | RT/CT | 4 | |
| Input Voltage VFB and ISENSE | VIN | 0 | 5.5 | V | VFB and ISENSE | 4 | |
| Output Voltage (OUTPUT) | VOUT | 0 | 30 | V | 4 | ||
| Supply Current, Externally Limited | ICC | 25 | mA | 4 | |||
| Output Current | IOUT | 200 | mA | 4 | |||
| Reference Output Current | IO(REF) | -20 | mA | 4 | |||
| Oscillator Frequency | fOSC | 100 | 500 | kHz | 4 | ||
| Operating Temperature | TA | -40 | 85 | °C | 4 | ||
| Reference Output Voltage | VREF | 4.95 | 5 | 5.05 | V | IOUT =1mA, TJ =25°C | 4 |
| Line Regulation | ΔVOUT | 6 | 20 | mV | VCC = 12V~25V | 4 | |
| Load Regulation | ΔVOUT | 6 | 25 | mV | IOUT = 1mA~20mA | 4 | |
| Average Temperature Coefficient Of Output Voltage | TS | 0.2 | 0.4 | mV/°C | 4 | ||
| Total Output Variation | VREF | 4.9 | 5.1 | V | VCC =12V |
4 | |
| Output Noise Voltage | eN | 50 | μV | f = 10Hz~10kHz, TJ =25°C | 4 | ||
| Long Term Stability | 5 | 25 | mV | TJ=25°C For 1000 hours | 4 | ||
| Output Short Circuit Current | ISC | -180 | -100 | -30 | mA | 4 | |
| Oscillator Frequency | fOSC | 49 | 52 | 55 | kHz | TJ =25°C, RT =62kΩ, CT =1nF, Min =225 kHz, Max =275 kHz | 5 |
| Oscillator Frequency (full range) | fOSC | 48 | 56 | kHz | TJ = Full range | 5 | |
| Frequency Change with Voltage | ΔfOSC | 0.2 | 1 | % | VCC = 12V ~ 25V | 5 | |
| Frequency Change with Temperature | ΔfOSC | 5 | % | TJ = Full range | 5 | ||
| Oscillator Voltage Swing | VOSC | 1.7 | V | Peak to peak | 5 | ||
| Discharge Current | IDISC | 7.8 | 8.3 | 8.8 | mA | TJ =25°C, RT/CT =2V | 5 |
| Discharge Current (full range) | IDISC | 7.5 | 8.8 | mA | RT/CT =2V | 5 | |
| Voltage Feedback Input | VFB | 2.45 | 2.5 | 2.55 | V | COMP =2.5V | 5 |
| Input Bias Current (error amp) | II(BIAS) | -0.3 | -1 | μA | 5 | ||
| Open Loop Voltage Gain | GVO | 65 | 90 | dB | VOUT =2V~4V | 5 | |
| Unity Gain Bandwidth | GBW | 0.7 | 1 | MHz | 5 | ||
| Power Supply Rejection Ratio (error amp) | PSRR | 60 | 70 | dB | VCC =12V~25V | 5 | |
| Output Sink Current | ISINK | 2 | 6 | mA | VFB =2.7V, COMP=1.1V | 5 | |
| Output Source Current | ISOURCE | -0.5 | -0.8 | mA | VFB =2.3V, COMP =5V | 5 | |
| Output Voltage Swing High State | VOH | 5 | 6 | V | VFB =2.3V, RL =15kΩ to GND | 5 | |
| Output Voltage Swing Low State | VOL | 0.7 | 1.1 | V | VFB =2.7V, RL =15kΩ to GND | 5 | |
| Current Sense Input Voltage Gain | GV | 2.85 | 3 | 3.15 | V/V | (Note 2,3) | 5 |
| Maximum Current Sense Input Threshold | VTH | 0.9 | 1 | 1.1 | V | COMP =5V (Note 2) | 5 |
| Power Supply Rejection Ratio (current sense) | PSRR | 70 | dB | VCC =12V~25V (Note 2) | 5 | ||
| Input Bias Current (current sense) | II(BIAS) | -2 | -10 | μA | 5 | ||
| Propagation Delay | tD | 150 | 300 | ns | VFB =0V~2V | 5 | |
| High-Level Output Voltage | VOH | 13 | 13.5 | V | IOH =-20mA | 5 | |
| High-Level Output Voltage | VOH | 12 | 13.5 | V | IOH =-200mA | 5 | |
| Low-Level Output Voltage | VOL | 0.1 | 0.4 | V | IOL =20mA | 5 | |
| Low-Level Output Voltage | VOL | 1.5 | 2.2 | V | IOL =200mA | 5 | |
| UVLO Output Voltage | VUVLO | 0.7 | 1.2 | V | VCC =5V, IOL=1mA | 5 | |
| Output Voltage Rise Time | tR | 50 | 150 | ns | CL =1nF, TJ = 25°C | 5 | |
| Output Voltage Fall Time | tF | 50 | 150 | ns | CL =1nF, TJ = 25°C | 5 | |
| Startup Threshold | VTH | 7.8 | 8.4 | 9 | V | 5 | |
| Minimum Operating Voltage After Start-Up | VCC(MIN) | 7 | 7.6 | 8.2 | V | 5 | |
| Maximum Duty Cycle | DC(MAX) | 94 | 96 | 100 | % | 5 | |
| Power Startup Supply Current | ICC+IC | 0.3 | 0.5 | mA | 5 | ||
| Power Operating Supply Current | ICC+IC | 11 | 17 | mA | VFB and ISENSE at 0V | 5 | |
| Power Supply Zener Voltage | VZ | 30 | 34 | V | ICC =25mA | 5 |
CAD (KiCad official)
- Symbol:
UC2843BG-S08-R - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
uc2843bg-s08-r-etched.step/uc2843bg-s08-r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc2843bg-s08-r.step/uc2843bg-s08-r.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC(Unisonic Tech) datasheet (9 pp, sha256
62697e97e778cf6a, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).