# LM34923MM

**Texas Instruments** · DC-DC Converters · VSSOP-10-0.5mm

LM34923MM from Texas Instruments, in a VSSOP-10-0.5mm. 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 | SW | power_out | Power switching node that connects to the output inductor, re-circulating diode or synchronous FET, and the bootstrap capacitor. |
| 2 | BST | passive | An external ceramic capacitor of 0.01 µF or greater is required between BST and SW, and it is charged from VCC through an internal diode when SW is low. |
| 3 | N/C | unconnected | Do not connect. |
| 4 | RTN | power_in | Ground for the entire circuit. |
| 5 | UV | input | A resistor divider from VIN or another system voltage programs the under-voltage detection threshold, and an internal current sink is enabled when UV is below 2.5V to provide hysteresis. |
| 6 | UVO | output | Open-drain under-voltage status output that is high when the UV pin is below 2.5V or when the VCC UVLO or shutdown function is invoked. |
| 7 | FB | input | Feedback input connected to the inverting input of the internal regulation comparator, with a regulation level of 2.5V. |
| 8 | RT/SD | input | A resistor between this pin and VIN sets the switch on-time (minimum recommended 200 ns at maximum input voltage), and taking this pin to ground shuts off the regulator. |
| 9 | VCC | power_out | Output of the internal high-voltage series pass regulator, regulated at 7.5V, which biases the buck switch gate driver and internal circuitry; a 1 µF ceramic capacitor to ground is required and the regulator is current limited to approximately 30 mA. |
| 10 | VIN | power_in | Input voltage with an operating range of 6V to 75V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-10-0.5mm |
| Category | Power Supply Chip |
| Pins | 10 |

## CAD (KiCad official)

- Symbol: `LM34923MM`
- Footprint: `Package_SO:MSOP-10_3x3mm_P0.5mm`
- 3D model: VSSOP-10-0.5mm (KiCad packages3D, STEP)
- 3D model files: `lm34923mm-etched.step` / `lm34923mm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm34923mm.step` / `lm34923mm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm34923) (28 pp, sha256 `f665b4486b01209d`, retrieved 2026-10-11, 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/lm34923mm-datasheet.pdf)