# RT9718BGQW

**Richtek Tech** · Monitors & Reset Circuits · DFN-8-EP(2x2)

RT9718BGQW from Richtek Tech, in a DFN-8-EP(2x2). 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 | VIN | power_in | The input power source, which can withstand up to 30V input. |
| 2 | GND | power_in | Analog ground. |
| 3 | NC | unconnected | No internal connection. |
| 4 | WRN | output | Open-drain logic output that turns LOW when any protection event occurs. |
| 5 | EN | input | Active-low chip enable: pull low or leave floating to enable the IC, force high (>1.5V) to disable it. |
| 6 | VB | power_in | Battery voltage monitoring input, connected to the battery pack positive terminal via an isolation resistor. |
| 7 | ILIM | passive | Over current protection threshold setting pin; connect a resistor between this pin and GND to set the OCP threshold. |
| 8 | VOUT | power_out | Output through the power MOSFET. |
| 9 | GND | power_in | Exposed pad, must be soldered to a large PCB and connected to GND for maximum thermal dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Richtek Tech |
| Package | DFN-8-EP(2x2) |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Operation Voltage (RT9718B) | VIN | 4 |  | 5.5 | V | Power On Reset, RT9718B | 3 |
| Supply Voltage POR Threshold | VPOR | 2.5 | 2.7 | 2.9 | V | VPOR Rising | 3 |
| Deglitch Time of POR |  |  | 8 |  | ms |  | 3 |
| Under Voltage Lockout Threshold | VUVLO | 2.45 |  | 2.75 | V | VUVLO Falling | 3 |
| Input Quiescent Current | IQ |  | 500 | 600 | µA | EN = 0V | 3 |
| Input Shutdown Current | ISHDN |  | 65 | 95 | µA | EN = 5V | 3 |
| Input OVP Threshold Voltage (RT9718B) | VIN_OVP | 5.6 | 5.85 | 6 | V | RT9718B | 3 |
| Input OVP Hysteresis |  |  | 60 | 100 | mV |  | 3 |
| Input OVP Propagation Delay |  |  |  | 1 | µs | VOUT = VIN x 80% | 3 |
| Input OVP Recovery Delay |  |  | 8 |  | ms |  | 3 |
| Over Current Protection | IOCP | 0.93 | 1 | 1.07 | A | RILIM = 25k | 4 |
| Battery OVP Threshold Rising | VBOVP | 4.3 | 4.35 | 4.4 | V | Threshold Rising | 4 |
| Battery OVP Falling Threshold | VBOVP | 4.225 |  |  | V |  | 4 |
| VB Pin Leakage Current |  |  |  | 20 | nA | VVB = 4.4V | 4 |
| EN Logic-High Threshold | VIH | 1.5 |  |  | V |  | 4 |
| EN Logic-Low Threshold | VIL |  |  | 0.4 | V |  | 4 |
| EN Internal Pull Down Resistor |  | 100 | 200 | 400 | kΩ |  | 4 |
| WRN Output Logic Low |  |  | 0.35 | 0.8 | V | Sink 5mA | 4 |
| WRN Output Logic High Leakage Current |  |  |  | 1 | µA |  | 4 |
| On Resistance | RON |  | 200 | 300 | mΩ | IOUT = 500mA, 4.3V < VIN < 6.5V | 4 |
| Over Current Protection Blanking Time | TOC |  | 180 |  | µs |  | 4 |
| Over Current Recover Delay |  |  | 64 |  | ms |  | 4 |
| Battery OVP Hysteresis |  |  | 30 |  | mV |  | 4 |
| Battery OVP Blanking Time | TVBOV |  | 180 |  | µs |  | 4 |
| Battery OVP Recover Delay |  |  | 8 |  | ms |  | 4 |
| OTP Threshold Rising |  |  | 140 |  | °C | Rising | 4 |
| OTP Hysteresis |  |  | 20 |  | °C | Hysteresis | 4 |
| OTP Recover Delay |  |  | 8 |  | ms |  | 4 |
| Soft-Start Time | TSD |  | 8 |  | ms |  | 4 |
| Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 3 |
| Ambient Temperature Range | TA | -40 |  | 85 | °C |  | 3 |
| Supply Input Voltage | VIN | -0.3 |  | 30 | V |  | 3 |
| VOUT, VB |  | -0.3 |  | 7 | V |  | 3 |
| Other Pins |  | -0.3 |  | 6 | V |  | 3 |
| Power Dissipation | PD |  |  | 0.606 | W | TA = 25°C, WDFN-8L 2x2 | 3 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| Lead Temperature |  |  |  | 260 | °C | Soldering, 10 sec. | 3 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 3 |
| ESD Susceptibility HBM |  |  |  | 2 | kV | Human Body Mode | 3 |
| ESD Susceptibility MM |  |  |  | 200 | V | Machine Mode | 3 |
| Package Thermal Resistance, Junction to Ambient | θJA |  | 165 |  | °C/W | WDFN-8L 2x2 | 3 |
| Package Thermal Resistance, Junction to Case | θJC |  | 20 |  | °C/W | WDFN-8L 2x2 | 3 |

## CAD (KiCad official)

- Symbol: `RT9718BGQW`
- Footprint: `Package_DFN_QFN:DFN-8-1EP_2x2mm_P0.5mm_EP0.6x1.2mm`
- 3D model: DFN-8-EP(2x2) (KiCad packages3D, STEP)
- 3D model files: `rt9718bgqw-etched.step` / `rt9718bgqw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rt9718bgqw.step` / `rt9718bgqw.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Richtek Tech datasheet](docs/rt9718bgqw-datasheet.pdf) (10 pp, sha256 `34899e92895406a2`, retrieved 2026-10-23, 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/rt9718bgqw-datasheet.pdf)