# MCP16311T-E

**Microchip Tech** · DC-DC Converters · MSOP-8

MCP16311T-E from Microchip Tech, in a MSOP-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 | VFB | input | Feedback pin sets the output voltage through an external resistor divider, with VFB at 0.800V typical in regulation. |
| 2 | VCC | power_out | Internal 5.0V bias regulator output that must be decoupled to AGND with a 1 µF X7R capacitor and is current limited to 50 mA. |
| 3 | EN | input | Logic-level enable that turns the regulator on above 1.3V and off below 1V, and must not be allowed to float. |
| 4 | VIN | power_in | Input supply pin for power and internal biasing, specified from 4.4V to 30V and decoupled with a 4.7 µF to 20 µF capacitor. |
| 5 | PGND | power_in | Power ground for the low-side synchronous switch, to be connected to the analog ground at a single point. |
| 6 | SW | output | Switch node connecting the internal high-side and low-side switches to the inductor and bootstrap capacitor, and it can rise very fast when the internal switch turns on. |
| 7 | BOOST | power_out | Boost pin supplies the high-side N-channel gate driver, with a bootstrap capacitor connected between BOOST and SW and a maximum capacitor voltage of 5V. |
| 8 | AGND | power_in | Signal ground for the analog reference, control loop and other internal circuits. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | MSOP-8 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Voltage (absolute maximum, VIN, SW) | VIN, SW | -0.5 |  | 32 | V |  | 3 |
| BOOST to GND voltage | BOOST, GND | -0.5 |  | 38 | V |  | 3 |
| BOOST to SW voltage | BOOST, SW | -0.5 |  | 6 | V |  | 3 |
| VFB voltage (absolute maximum) | VFB | -0.5 |  | 6 | V |  | 3 |
| EN voltage (absolute maximum) | EN | -0.5 |  |  | V | Maximum printed as (VIN + 0.3V); not computed | 3 |
| ESD protection HBM |  |  |  | 1 | kV | HBM, all pins | 3 |
| Storage temperature (absolute maximum) |  | -65 |  | 150 | °C |  | 3 |
| Ambient temperature with power applied |  | -40 |  | 125 | °C | Power applied | 3 |
| Operating junction temperature (absolute maximum) |  | -40 |  | 150 | °C |  | 3 |
| Input Voltage Range | VIN | 4.4 |  | 30 | V | Note 1 | 3 |
| Quiescent Current | IQ |  | 44 | 60 | µA | Nonswitching, VFB = 0.9V | 3 |
| Quiescent Current - Shutdown | IQ_SHDN |  | 3 | 9 | µA | VOUT = EN = 0V | 3 |
| Undervoltage Lockout Start | UVLOSTRT |  | 4.1 | 4.4 | V | VIN Rising | 3 |
| Undervoltage Lockout Stop | UVLOSTOP | 3.18 | 3.6 |  | V | VIN Falling | 3 |
| Undervoltage Lockout Hysteresis | UVLOHYS | 0.2 | 0.5 | 1 | V |  | 3 |
| Feedback Voltage | VFB | 0.784 | 0.8 | 0.816 | V | IOUT = 5 mA | 3 |
| Output Voltage Adjust Range | VOUT | 2 |  | 24 | V | Note 2, Note 3 | 3 |
| Feedback Voltage Line Regulation | (VFB/VFB)/VIN | -0.15 | 0.01 | 0.15 | %/V | VIN = 7V to 30V, IOUT = 50 mA | 3 |
| Feedback Input Bias Current | IFB |  | 10 | 250 | nA |  | 4 |
| Switching Frequency | fSW | 425 | 500 | 575 | kHz |  | 4 |
| Maximum Duty Cycle | DCMAX | 85 | 94 |  | % | Note 3 | 4 |
| EN Input Logic High | VIH | 1.85 |  |  | V |  | 4 |
| EN Input Logic Low | VIL |  |  | 0.4 | V |  | 4 |
| EN Input Leakage Current | IENLK |  | 0.1 | 1 | µA | VEN = 5V | 4 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | °C | Steady State | 4 |
| Maximum Junction Temperature | TJ |  |  | 150 | °C | Transient | 4 |
| Thermal Resistance, 8L-MSOP, junction to ambient | θJA |  | 211 |  | °C/W | EIA/JESD51-3 Standard | 4 |

## CAD (KiCad official)

- Symbol: `MCP16311T-E`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `mcp16311t-e-etched.step` / `mcp16311t-e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mcp16311t-e.step` / `mcp16311t-e.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](https://ww1.microchip.com/downloads/en/DeviceDoc/MCP16311-Family-Data-Sheet-DS20005255C.pdf) (40 pp, sha256 `1c181e12de0dcaec`, retrieved 2026-11-05, 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](docs/mcp16311t-e-datasheet.pdf)