component
LM5009MMX
Public Unreviewedby Ray
Texas Instruments DC-DC Converters, VSSOP-8-0.65mm. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM5009MMX
Texas Instruments · DC-DC Converters · VSSOP-8-0.65mm
LM5009MMX from Texas Instruments, in a VSSOP-8-0.65mm. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SW | output | Switching output. Power switching node of the integrated N-channel buck MOSFET. Connect to the buck inductor, recirculating (freewheeling) diode, and the bottom plate of the bootstrap capacitor. Absolute maximum steady-state SW voltage is -1 V referenced to RTN. |
| 2 | BST | power_in | Boost pin. External bootstrap capacitor (0.022 uF ceramic recommended) between BST and SW that provides gate drive for the internal high-side buck switch. An internal diode charges the bootstrap capacitor from VCC. BST-to-VCC absolute maximum is 100 V; BST-to-SW absolute maximum is 14 V. |
| 3 | RCL | input | Current limit off-time set pin. A resistor from RCL to RTN programs the off-time asserted when a current limit event is detected. Off-time defaults to 35 us when FB = 0 V (RCL = 100 kOhm). |
| 4 | RTN | power_in | Ground return pin. Ground reference for the entire circuit and current-return path for the internal buck switch and control logic. |
| 5 | FB | input | Feedback input from the regulated output. Connects to the inverting input of the internal regulation comparator with an internal 2.5-V reference (2% accurate over -40 C to +125 C). An overvoltage threshold at 2.875 V turns the switch off. FB bias current is 1 nA typical. |
| 6 | RON/SD | input | On-time set pin and remote shutdown. A resistor from RON/SD to VIN sets the switch on-time as a function of VIN (feed-forward). Minimum recommended on-time is 250 ns at maximum input voltage. Pulling this pin below ~0.7 V (typ) shuts the device down; IN shutdown current is 76 uA typical. |
| 7 | VCC | power_out | Output of the internal high-voltage startup regulator (7.0 V typical, 6.6 V to 7.4 V). Provides gate-drive power for the internal buck switch. If an auxiliary voltage above ~7 V is applied, the internal pass regulator shuts down to reduce dissipation; do not exceed 14 V. An internal diode connects VCC to BST. A 0.1-uF local decoupling capacitor is required. |
| 8 | VIN | power_in | Input voltage supply pin. Recommended operating range 9.5 V to 95 V; absolute maximum 100 V referenced to RTN. Supplies the internal startup regulator and the top of the buck switch through the internal MOSFET. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
LM5009MMXLM5009MMXDGKLM5009MMXSDLM5009MMXSDXLM5009MMXNGU
CAD (KiCad official)
- Symbol:
LM5009MMX - Footprint:
Package_SO:VSSOP-8_2.3x2mm_P0.5mm - 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (26 pp, sha256
21d1709ee8fe241d, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).