# XC9236A18CMR

**Torex Semicon** · DC-DC Converters · SOT-23-5

XC9236A18CMR from Torex Semicon, 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 | Power input with an operating voltage range of 2.0V to 6.0V for the A type, and a bypass capacitor CIN should be connected as close as possible to the VIN and VSS pins. |
| 2 | VSS | power_in | Ground pin for the IC, which should be connected as close as possible to the VIN bypass capacitor and kept on thick, short PCB ground traces. |
| 3 | CE/MODE | input | High-active enable and mode selection pin, where a level above 0.65V and up to 6.0V enables operation in the PWM/PFM automatic switching mode and a level from 0V to 0.25V puts the IC in stand-by. |
| 4 | VOUT | power_out | Fixed output voltage pin for the A type, which sets the 1.8V output and enters high impedance during shutdown. |
| 5 | Lx | output | Switching output pin that drives the external coil, with high impedance in shutdown and no CL discharge path on the A type. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Torex Semicon |
| Package | SOT-23-5 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage | VOUT | 1.764 | 1.8 | 1.836 | V | When connected to external components, VIN=VCE=5.0V, IOUT=30mA | 5 |
| Operating Voltage Range | VIN | 2 |  | 6 | V |  | 5 |
| Maximum Output Current | IOUTMAX | 600 |  |  | mA | VIN=VOUT(E)+2.0V, VCE=1.0V, When connected to external components (*9) | 5 |
| UVLO Voltage | VUVLO | 1 | 1.4 | 1.78 | V | VCE=VIN, VOUT=0V, Voltage which Lx pin holding L level (*1, *11) | 5 |
| Supply Current | IDD |  | 15 | 33 | μA | VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V | 5 |
| Stand-by Current | ISTB |  | 0 | 1 | μA | VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V | 5 |
| Oscillation Frequency | fOSC | 1020 | 1200 | 1380 | kHz | When connected to external components, VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA | 5 |
| PFM Switching Current | IPFM | 120 | 160 | 200 | mA | When connected to external components, VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA (*12) | 5 |
| PFM Duty Limit | DTYLIMIT_PFM |  | 200 | 300 | % | VCE=VIN=(C-1), IOUT=1mA (*12) | 5 |
| Maximum Duty Cycle | DTYMAX | 100 |  |  | % | VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V | 5 |
| Minimum Duty Cycle | DTYMIN |  |  | 0 | % | VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V | 5 |
| Efficiency | EFFI |  | 92 |  | % | When connected to external components, VCE=VIN=VOUT(E)+1.2V, IOUT=100mA | 5 |
| Lx SW H ON Resistance 1 | RLxH |  | 0.35 | 0.55 |  | VIN=VCE=5.0V, VOUT=0V, ILx=100mA (*3) | 5 |
| Lx SW H ON Resistance 2 | RLxH |  | 0.42 | 0.67 |  | VIN=VCE=3.6V, VOUT=0V, ILx=100mA (*3) | 5 |
| Lx SW L ON Resistance 1 | RLxL |  | 0.45 | 0.65 |  | VIN=VCE=5.0V (*4) | 5 |
| Lx SW L ON Resistance 2 | RLxL |  | 0.52 | 0.77 |  | VIN=VCE=3.6V (*4) | 5 |
| Lx SW H Leak Current | ILEAKH |  | 0.01 | 1 | μA | VIN=VOUT=5.0V, VCE=0V, Lx=0V | 5 |
| Lx SW L Leak Current | ILEAKL |  | 0.01 | 1 | μA | VIN=VOUT=5.0V, VCE=0V, Lx=5.0V | 5 |
| Current Limit | ILIM | 900 | 1050 | 1350 | mA | VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V (*8) | 5 |
| Output Voltage Temperature Characteristics | VOUT/(VOUT・△Topr) | -100 |  | 100 | ppm/°C | IOUT=30mA, -40℃≦Topr | 5 |
| CE H Voltage | VCEH | 0.65 |  | 6 | V | VOUT=0V, Applied voltage to VCE, Voltage changes Lx to H level (*11) | 5 |
| CE L Voltage | VCEL |  |  | 0.25 | V | VOUT=0V, Applied voltage to VCE, Voltage changes Lx to L level (*11) | 5 |
| Soft Start Time | tSS | 0.5 | 1 | 2.5 | ms | When connected to external components, VCE=0V VIN, IOUT=1mA | 5 |
| Latch Time | tLAT | 1 |  | 20 | ms | VIN=VCE=5.0V, VOUT=0.8×VOUT(E), Short Lx at 1 resistance (*7) | 5 |
| Short Protection Threshold Voltage | VSHORT | 0.675 | 0.9 | 1.15 | V | Sweeping VOUT, VIN=VCE=5.0V, Short Lx at 1 resistance, VOUT voltage which Lx becomes L level within 1ms | 5 |
| VIN Pin Voltage | VIN | -0.3 |  | 6.5 | V |  | 4 |
| Lx Pin Voltage | VLx | -0.3 |  |  | V | Maximum printed as VIN + 0.3 | 4 |
| VOUT Pin Voltage | VOUT | -0.3 |  | 6.5 | V |  | 4 |
| FB Pin Voltage | VFB | -0.3 |  | 6.5 | V |  | 4 |
| CE/MODE Pin Voltage | VCE | -0.3 |  | 6.5 | V |  | 4 |
| Lx Pin Current | ILx | -1500 |  | 1500 | mA |  | 4 |
| Power Dissipation SOT-25 | Pd |  |  | 250 | mW | SOT-25 package | 4 |
| Operating Ambient Temperature | Topr | -40 |  | 85 | °C |  | 4 |
| Storage Temperature | Tstg | -55 |  | 125 | °C |  | 4 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | (2) Sn-AG-Cu is used for the package terminals. If eutectic solder is used, mounting reliability is decreased. Please do not use eutectic solder paste. | 20 |

## CAD (KiCad official)

- Symbol: `XC9236A18CMR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `xc9236a18cmr-etched.step` / `xc9236a18cmr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `xc9236a18cmr.step` / `xc9236a18cmr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Torex Semicon datasheet](docs/xc9236a18cmr-datasheet.pdf) (34 pp, sha256 `8d285a7b969f3d97`, retrieved 2026-10-27, 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/xc9236a18cmr-datasheet.pdf)