# RT9053AGB

**Richtek Tech** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5

RT9053AGB from Richtek Tech, in a SOT-23-5. 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 | Supply input, operating from 2.2V to 5.5V with an absolute maximum of 6V, and a minimum 1µF input capacitor recommended. |
| 2 | GND | power_in | Ground pin, which must be connected to the system ground plane. |
| 3 | EN | input | Active-high chip enable: the regulator is on when EN is above 1.6V and shuts down when EN falls below 0.6V (absolute maximum 6V). |
| 4 | FB | input | Output voltage feedback input, connected to the R1/R2 divider; the feedback reference is 0.8V typical. |
| 5 | VOUT | power_out | Regulator output, rated for up to 400mA with a minimum 1µF output capacitor required for stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Richtek Tech |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| FB Reference Voltage | VFB | 0.792 | 0.8 | 0.808 | V |  | 3 |
| Output Voltage Accuracy | VOUT | -1 | 0 | 1 | % | IOUT = 10mA | 3 |
| Quiescent Current | IQ |  | 35 | 50 | µA | IOUT = 0mA | 3 |
| Shutdown Current | ISHDN |  | 0.7 | 1.5 | µA | VEN = 0V | 3 |
| Current Limit | ILIM | 400 | 650 | 1000 | mA | RLOAD = 0, 2.2V VIN < 5.5V | 3 |
| Dropout Voltage | VDROP |  | 230 | 350 | mV | IOUT = 400mA | 3 |
| Load Regulation | VLOAD |  |  | 1 | % | 1mA < IOUT < 400mA, 2.2V VIN < 5.5V | 3 |
| EN Threshold Voltage Logic-High | VIH | 1.6 |  | 5.5 | V |  | 3 |
| EN Threshold Voltage Logic-Low | VIL | 0 |  | 0.6 | V |  | 3 |
| Enable Pin Current | IEN |  | 1 | 2 | µA |  | 3 |
| FB Pin Current | IFB |  | 0.1 | 1 | µA |  | 3 |
| Thermal Shutdown Temperature | TSD |  | 150 |  | °C |  | 3 |
| Supply Input Voltage | VIN | 2.2 |  | 5.5 | V |  | 3 |
| Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 3 |
| Ambient Temperature Range | TA | -40 |  | 85 | °C |  | 3 |
| Supply Input Voltage | VIN |  |  | 6 | V |  | 3 |
| EN Input Voltage | VEN |  |  | 6 | V |  | 3 |
| Power Dissipation, SOT-23-5 | PD |  |  | 0.4 | W | TA = 25°C (Note 2) | 3 |
| Lead Temperature (Soldering 10sec) |  |  |  | 260 | °C | Soldering 10sec | 3 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| Storage Temperature Range | TSTG | -65 |  | 150 | °C |  | 3 |
| ESD Susceptibility HBM |  |  |  | 2 | kV | Human Body Model (Note 3) | 3 |
| ESD Susceptibility MM |  |  |  | 200 | V | Machine Model (Note 3) | 3 |
| Package Thermal Resistance SOT-23-5 | θJA |  |  | 250 | °C/W | JEDEC 51-3 single-layer test board (Note 2) | 3 |

## CAD (KiCad official)

- Symbol: `RT9053AGB`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `rt9053agb-etched.step` / `rt9053agb-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rt9053agb.step` / `rt9053agb.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Richtek Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588940949255311360) (10 pp, sha256 `d5e3f5a806001600`, retrieved 2026-10-19, 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/rt9053agb-datasheet.pdf)