# MAX861IUA+

**Analog Devices Inc Maxim Integrated** · DC-DC Converters · MSOP-8

MAX861IUA+ from Analog Devices Inc Maxim Integrated, in a MSOP-8. 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 | FC | input | Frequency Control input. Selects one of three switching frequencies per Table 1: FC=VDD or open ~13kHz, FC=GND ~100kHz, FC=OUT ~250kHz (MAX861). FC input current is only -2 to -4 uA when FC<4V. |
| 2 | C1+ | passive | Flying-Capacitor Positive Terminal. Connect the positive terminal of the flying (pump) capacitor C1 (typically 2.2 uF at 250 kHz) between C1+ and C1-. |
| 3 | GND | power_in | Ground reference in inverter mode. In doubler mode, this pin becomes the Positive Input Supply - the input voltage is applied between pin 3 (positive) and pin 5 (which serves as ground). |
| 4 | C1- | passive | Flying-Capacitor Negative Terminal. Connect the negative terminal of the flying (pump) capacitor C1 between C1+ (pin 2) and C1- (pin 4). |
| 5 | OUT | power_out | Charge-pump output. In inverter mode this is the Negative Output (-VIN nominal). In doubler mode this pin becomes Ground. Sources/sinks up to 50 mA with ~12 ohm typical output resistance. |
| 6 | LV | input | Low-Voltage-Operation input. Connect to GND for inverting operation (may be floated if VDD > 3V for MAX660/ICL7660 compatibility). In doubler mode, must be connected to OUT for all input voltages. |
| 7 | SHDN | input | Active-Low Shutdown input. Drive low (<0.3 V) to shut down the charge pump (supply current drops below 1 uA). Drive high (>1.2 V) to enable. In inverter mode, tie to VDD if unused; in doubler mode, tie to GND if unused. Do not leave floating. |
| 8 | VDD | power_in | Positive Input Supply in inverter mode (+1.5V to +5.5V). In doubler mode this pin becomes the Doubled Positive Output (approximately 2 x VIN). Absolute maximum VDD to GND is +6.0V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc Maxim Integrated |
| Package | MSOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `MAX861IUA+`
- `MAX861IUA+ISA`
- `MAX861IUA+ESA`
- `MAX861IUA+MSA`
- `MAX861IUA+MJA`
- `MAX861IUA+C/D`

## CAD (KiCad official)

- Symbol: `MAX861IUA+`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `max861iua-etched.step` / `max861iua-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max861iua.step` / `max861iua.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Analog Devices Inc Maxim Integrated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588950792086958080) (None pp, sha256 `924043bfeecf2e5f`, retrieved 2026-08-17, tier: lcsc)
- **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/max861iua-datasheet.pdf)