# AP5100WG-7

**Diodes Incorporated** · DC-DC Converters · SOT-26

AP5100WG-7 from Diodes Incorporated, in a SOT-26. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BST | passive | Bootstrap. A capacitor (0.1µF to 1µF typical) connected between SW and BST forms a floating supply across the internal power switch driver, boosting the high-side MOSFET gate above the supply voltage. |
| 2 | GND | power_in | Ground reference for the regulated output voltage and all internal control circuits. Careful PCB layout is required to minimize noise coupling into this reference. |
| 3 | FB | input | Feedback input, nominally 0.81V. Connect to the output resistor divider (or directly to VOUT for 0.81V output) to set the regulated output voltage. Includes a frequency foldback comparator that lowers the oscillator frequency to ~480kHz when FB falls below 400mV during current limit. |
| 4 | EN | input | On/Off control input. Pull above 1.2V to enable the converter and below 0.4V to disable it. Do not leave floating; if unused, tie to VIN through a 100kΩ resistor. |
| 5 | IN | power_in | Supply voltage input, 4.75V to 24V (absolute maximum 26V). A local decoupling capacitor (C1) is required close to the pin to prevent large voltage spikes at the input. |
| 6 | SW | power_out | Switch output from the internal high-side MOSFET (RDS(on) ~0.35Ω, current limit ~2.4A). Connects to the external inductor and catch diode; also the reference return for the BST floating supply capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-26 |
| Category | PMIC |
| Pins | 6 |

## Ordering variants

- `AP5100WG-7`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Feedback Voltage | VFB | 0.79 | 0.81 | 0.83 | V | 4.75V ≤ VIN ≤ 24V | 5 |
| Oscillator Frequency | fSW | 1.1 | 1.4 | 1.7 | MHz | VFB = 0.6V | 5 |
| Under Voltage Lockout Threshold (Rising) |  | 3.8 | 4 | 4.2 | V | Rising | 5 |
| EN Input Low Voltage |  |  |  | 0.4 | V |  | 5 |
| EN Input High Voltage |  | 1.2 |  |  | V |  | 5 |
| Supply Current (Shutdown) | IS |  | 0.1 | 1 | µA | VEN = 0V | 5 |
| Supply Current (Quiescent) | IQ |  | 0.4 | 1 | mA | VEN = 2V, VFB = 1V | 5 |
| Feedback Current | IFB |  |  | 0.1 | µA | VFB = 0.8V | 5 |
| Switch Leakage Current |  |  |  | 10 | µA | VEN = 0V, VSW = 0V | 5 |
| Minimum On-Time | tON |  |  | 100 | ns | Note 5 | 5 |
| ESD Protection Human Body Model | ESD HBM |  |  | 3 | KV |  | 4 |
| ESD Protection Machine Model | ESD MM |  |  | 300 | V |  | 4 |
| Supply Voltage (absolute) | VIN |  |  | 26 | V |  | 4 |
| Switch Voltage | VSW | -0.3 |  |  | V | Rating printed as -0.3 to VIN +0.3 V; upper limit not a fixed number | 4 |
| All Other Pins |  | -0.3 |  | 6 | V |  | 4 |
| Storage Temperature | TST | -65 |  | 150 | °C |  | 4 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 4 |
| Lead Temperature | TL |  |  | 260 | °C |  | 4 |
| Supply Voltage (recommended) | VIN | 4.75 |  | 24 | V |  | 4 |
| Operating Ambient Temperature Range | TA | -25 |  | 85 | °C |  | 4 |
| Output Voltage | VOUT | 0.81 |  | 15 | V |  | 4 |
| Switch-On Resistance | RDS(ON) |  | 0.35 |  | Ω | Note 5 (guaranteed by design) | 5 |
| Current Limit |  |  | 2.4 |  | A | Note 5 | 5 |
| Fold-back Frequency |  |  | 480 |  | kHz | VFB = 0V | 5 |
| Maximum Duty Cycle |  |  | 87 |  | % | VFB = 0.6V | 5 |
| Under Voltage Lockout Threshold Hysteresis |  |  | 150 |  | mV |  | 5 |
| EN Input Current |  |  | 0.3 |  | µA | VEN = 2V | 5 |
| EN Input Current |  |  | 0.1 |  | µA | VEN = 0V | 5 |
| Thermal Shutdown |  |  | 140 |  | °C | Note 5 | 5 |
| Junction to Ambient Thermal Resistance | θJA |  | 140 |  | °C/W | Note 3: measured on approximately 1” square of 1 oz copper (SOT26) | 4 |
| Junction to Case Thermal Resistance | θJC |  | 35 |  | °C/W | Note 3 | 4 |

## CAD (KiCad official)

- Symbol: `AP5100WG-7`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-26 (KiCad packages3D, STEP)
- 3D model files: `ap5100wg-7-etched.step` / `ap5100wg-7-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ap5100wg-7.step` / `ap5100wg-7.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`ap5100wg-7.step`](ap5100wg-7.step) | 97 KB | You want the bare part, or you mark your own boards. |
| [`ap5100wg-7-etched.step`](ap5100wg-7-etched.step) | 1.8 MB | You want the part with `AP5100WG-7` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 449 faces against 117 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/AP5100WG-7.pdf) (12 pp, sha256 `cc0494aed30da802`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ap5100wg-7-datasheet.pdf)