# MIC38C43YM-TR

**Microchip Tech** · DC-DC Controllers · SOIC-8

MIC38C43YM-TR from Microchip Tech, in a SOIC-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 | Compensation: connect external compensation network to modify the error amplifier output. |
| 2 | FB | input | Feedback input to the error amplifier; feedback is 2.5V at the desired output voltage. |
| 3 | ISNS | input | Current sense comparator input; connect to a current sensing resistor or current transformer. |
| 4 | RT/CT | passive | Timing resistor/timing capacitor: connect external RC network to select switching frequency. |
| 5 | GND | power_in | Combined analog and power ground. |
| 6 | OUT | output | Gate driver totem-pole output with rail-to-rail swing, 0.5A maximum output current. |
| 7 | VDD | power_in | Analog supply input for controller circuitry and output stage, 20V maximum. |
| 8 | VREF | power_out | 5V reference output; connect external RC network. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-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 |
|---|---|---|---|---|---|---|---|
| Output Voltage | VREF | 4.9 | 5 | 5.1 | V | TA = +25°C, IVREF = 1 mA | 4 |
| Line Regulation | ΔVREF(LINE) |  | 2 | 20 | mV | 12V ≤ VDD ≤ 18V, IVREF = 5 μA, Note 6 | 4 |
| Load Regulation | ΔVREF(LOAD) |  | 1 | 25 | mV | 1 mA ≤ IVREF ≤ 20 mA | 4 |
| Total Output Variation | ΔVREF(TOT) | 4.82 |  | 5.18 | V | Line, Load, Temperature, Note 2 | 4 |
| Long-Term Stability | ΔVREF(LT) |  | 5 | 25 | mV | TA = +125°C, 1000 hours, Note 2 | 4 |
| Output Short-Circuit | IVREF(SC) | -30 | -80 | -180 | mA |  | 4 |
| Oscillator Initial Accuracy | ΔfOSC(INIT) | 49 | 52 | 55 | kHz | TA = +25°C, Note 3 | 4 |
| Oscillator Voltage Stability | ΔfOSC(VS) |  | 0.2 | 1 | % | 12V ≤ VDD ≤ 18V, Note 6 | 4 |
| Clock Ramp Reset Current | IDISCHG | 6 | 8.4 | 9 | mA | TA = +25°C, VRT/CT = 2V | 4 |
| Clock Ramp Reset Current | IDISCHG | 6 | 8.4 | 9.5 | mA | TA = TMIN to TMAX | 4 |
| Error Amp Input Voltage | VIN(EA) | 2.42 | 2.5 | 2.58 | V | VCOMP = 2.5V | 4 |
| Error Amp Input Bias Current | IBIAS(EA) |  | -0.1 | -2 | µA | VFB = 5.0V | 4 |
| Open Loop Voltage Gain | AVOL | 65 | 90 |  | dB | 2V ≤ VCOMP ≤ 4V | 4 |
| Unity Gain Bandwidth | GBW | 0.7 | 1 |  | MHz | Note 2 | 4 |
| Error Amp PSRR | PSRREA | 60 |  |  | dB | 12V ≤ VDD ≤ 18V | 4 |
| COMP Output Sink Current | ICOMP(SINK) | 2 | 14 |  | mA | VFB = 2.7V, VCOMP = 1.1V | 4 |
| COMP Output Source Current | ICOMP(SRC) | -0.5 | -1 |  | mA | VFB = 2.3V, VCOMP = 5V | 4 |
| COMP High Voltage | VCOMP_H | 5 | 6.8 |  | V | VFB = 2.3V, RLOAD = 15 kΩ to ground | 4 |
| COMP Low Voltage | VCOMP_L |  | 0.1 | 1.1 | V | VFB = 2.7V, RLOAD = 15 kΩ to VREF | 4 |
| Current Sense Divider Gain | ADIV | 2.85 | 3 | 3.15 | V/V | Note 4, Note 5 | 4 |
| Current Sense Maximum Threshold | VTH(MAX) | 0.9 | 1 | 1.1 | V | VCOMP = 5V, Note 4 | 4 |
| Current Sense Input Bias Current | IBIAS(CS) |  | -0.1 | -2 | µA |  | 4 |
| Delay to Output | tD |  | 120 | 250 | ns |  | 4 |
| Rise Time | tR |  | 40 | 80 | ns | TA = +25°C, CLOAD = 1 nF | 4 |
| Fall Time | tF |  | 30 | 60 | ns | TA = +25°C, CLOAD = 1 nF | 4 |
| Start Threshold | VTH(ST) | 7.8 | 8.4 | 9 | V | MIC38C43/45 | 5 |
| Minimum Operating Voltage | VDD(MIN) | 7 | 7.6 | 8.2 | V | MIC38C43/45 | 5 |
| Maximum Duty Cycle | DMAX | 94 | 96 |  | % | MIC38C42/43 | 5 |
| Minimum Duty Cycle | DMIN |  |  | 0 | % |  | 5 |
| Start-Up Current | IDD(START) |  | 50 | 200 | µA | VDD = 7.5V for MIC38C43/45 | 5 |
| Operating Supply Current | IDD(Q) |  | 4 | 6 | mA | VFB = VISNS = 0V | 5 |
| Zener Voltage at VDD Pin | VZ | 30 | 37 |  | V | IDD = 25 mA, Note 6 | 5 |
| Zener Current (VDD pin) | IZ |  |  | 30 | mA |  | 3 |
| Supply Voltage | VDD |  |  | 20 | V | Note 1 | 3 |
| Switch Supply Voltage | VD |  |  | 20 | V |  | 3 |
| Current Sense Voltage | VISNS | -0.3 |  | 5.5 | V |  | 3 |
| Feedback Voltage | VFB | -0.3 |  | 5.5 | V |  | 3 |
| Output Current | IOUT |  |  | 0.5 | A |  | 3 |
| Storage Temperature Range | TS | -65 |  | 150 | °C |  | 6 |
| Operating Ambient Temperature Range | TA | -40 |  | 85 | °C |  | 6 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 6 |
| Maximum Junction Temperature | TJ(MAX) |  |  | 150 | °C |  | 6 |
| Thermal Resistance 8-Ld SOIC | θJA |  | 170 |  | °C/W |  | 6 |
| Reference Temperature Stability | TCVREF |  | 0.2 |  | mV/°C | Note 2 | 4 |
| Oscillator Temperature Stability | TCFOSC |  | 0.04 |  | %/°C | TMIN ≤ TA ≤ TMAX, Note 2 | 4 |
| Output Noise Voltage | VNOISE |  | 50 |  | µV | 10 Hz ≤ f ≤ 10 kHz, TA = +25°C, Note 2 | 4 |
| RDS(ON) Pull High | RDSON_H |  | 20 |  | Ω | ISOURCE = 200 mA | 4 |
| RDS(ON) Pull Low | RDSON_L |  | 11 |  | Ω | ISINK = 200 mA | 4 |

## CAD (KiCad official)

- Symbol: `MIC38C43YM-TR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `mic38c43ym-tr-etched.step` / `mic38c43ym-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mic38c43ym-tr.step` / `mic38c43ym-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/mic38c43ym-tr-datasheet.pdf) (24 pp, sha256 `73c8031622326521`, retrieved 2026-10-27, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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](docs/mic38c43ym-tr-datasheet.pdf)