# MD8933ESF4

**Shanghai Mingda Microelectronics** · DC-DC Converters · ESOP-8

MD8933ESF4 from Shanghai Mingda Microelectronics, in a ESOP-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 | BOOT | output | A 0.1μF bootstrap capacitor is required between the BOOT and PH pins, and if its voltage falls below the minimum requirement the high-side MOSFET is forced off until the capacitor is refreshed. |
| 2 | VIN | power_in | This pin is the 3.5V to 28V input supply voltage. |
| 3 | EN | input | Enable pin: pull below 0.5V to disable and float to enable, with programming the input undervoltage lockout using two resistors recommended. |
| 4 | SS | input | Slow-start pin, where an external capacitor connected to this pin sets the output rise time. |
| 5 | VSENSE | input | This pin is the inverting node of the transconductance (gm) error amplifier. |
| 6 | COMP | output | Error-amplifier output and input to the PWM comparator, with frequency compensation components connected to this pin. |
| 7 | GND | power_in | Ground pin, which must be connected to the exposed PowerPAD on the ESOP8 package for proper operation. |
| 8 | PH | output | The PH pin is the source of the internal high-side power MOSFET. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## 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 VIN | VIN | -0.3 |  | 30 | V |  | 3 |
| Output voltage PH | PH | -0.6 |  | 30 | V |  | 3 |
| EN pin voltage | EN | -0.3 |  | 6 | V |  | 3 |
| BOOT voltage | BOOT |  |  | 38 | V |  | 3 |
| VSENSE voltage | VSENSE | -0.3 |  | 3 | V |  | 3 |
| COMP voltage | COMP | -0.3 |  | 3 | V |  | 3 |
| SS voltage | SS | -0.3 |  | 3 | V |  | 3 |
| BOOT-PH voltage | BOOT-PH |  |  | 8 | V |  | 3 |
| PH 10-ns transient from ground to negative peak | PH | -5 |  |  | V | 10-ns transient from ground to negative peak | 3 |
| EN source current | EN |  |  | 100 | μA | source current | 3 |
| BOOT source current | BOOT |  |  | 100 | mA | source current | 3 |
| VSENSE source current | VSENSE |  |  | 10 | μA | source current | 3 |
| PH source current | PH |  |  | 9 | A | source current | 3 |
| VIN sink current | VIN |  |  | 9 | A | sink current | 3 |
| COMP sink current | COMP |  |  | 100 | μA | sink current | 3 |
| SS sink current | SS |  |  | 200 | μA | sink current | 3 |
| Operating ambient temperature | Topr | -40 |  | 150 | °C |  | 3 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 3 |
| ESD HBM |  | -2500 |  | 2500 | V | HBM | 3 |
| ESD CDM |  | -2000 |  | 2000 | V | CDM | 3 |
| Power dissipation ESOP8 | PD |  |  | 1500 | mW | ESOP8 | 3 |
| Thermal resistance ESOP8 | RθJA |  | 66 |  | °C/W | ESOP8 | 3 |
| Internal undervoltage lockout threshold |  |  | 3.5 |  | V | Rising and falling | 4 |
| Shutdown supply current |  |  | 1.2 | 4 | μA | EN = 0V, VIN = 12V, -40°C to 85°C | 4 |
| Operating non-switching supply current |  |  | 100 | 190 | μA | VSENSE = 0.85 V | 4 |
| Enable threshold rising |  |  | 1.2 |  | V | Rising | 4 |
| Enable threshold falling |  |  | 0.5 |  | V | Falling | 4 |
| Input current at enable rise threshold minus 50mV |  |  | 3.2 |  | μA | Enable rise threshold, 50mV | 4 |
| Input current at enable rise threshold plus 50mV |  |  | 3.5 |  | μA | Enable rise threshold + 50mV | 4 |
| Voltage reference | Vref | 0.772 | 0.8 | 0.828 | V |  | 4 |
| On resistance high-side MOSFET | RDS(on) |  | 66 |  | mΩ | BOOT-PH = 3V, VIN = 3.5V | 4 |
| On resistance high-side MOSFET | RDS(on) |  | 60 |  | mΩ | BOOT-PH = 6V, VIN = 12V | 4 |
| Error amplifier source/sink current |  | -8 |  | 8 | μA | V(COMP) = 1V, 100-mV overdrive | 4 |
| Current-limit threshold |  | 3.5 |  | 5 | A | VIN = 12V | 4 |
| Switching frequency |  | 456 | 570 | 684 | KHz | VIN = 12V | 4 |
| Minimum controllable on time |  | 160 | 200 |  | ns | VIN = 12V | 4 |
| Maximum controllable duty ratio |  | 90 |  | 93 | % | BOOT-PH = 6V | 4 |
| Error amplifier transconductance (gm) | gm |  | 90 |  | μmhos | -2μA < I(COMP) < 2μA, V(COMP) = 1V | 4 |
| Error amplifier DC gain |  |  | 800 |  | V/V | VSENSE = 0.8V | 4 |
| Error amplifier unity gain bandwidth |  |  | 2.7 |  | MHz | 5pF capacitance from COMP to GND pins | 4 |
| Switch current to COMP transconductance |  |  | 10 |  | A/V | VIN = 12V | 4 |
| Pulse skipping Eco-mode switch current threshold |  |  | 220 |  | mA |  | 4 |
| Thermal shutdown |  |  | 165 |  | °C |  | 4 |
| SS charge current |  |  | 2 |  | μA | V(SS) = 0.4V | 4 |
| SS to VSENSE matching |  |  | -35 |  | mV | V(SS) = 0.4V | 4 |

## CAD (KiCad official)

- Symbol: `MD8933ESF4`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `md8933esf4-etched.step` / `md8933esf4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md8933esf4.step` / `md8933esf4.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](docs/md8933esf4-datasheet.pdf) (26 pp, sha256 `08733d3b925067d8`, retrieved 2026-10-28, 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/md8933esf4-datasheet.pdf)