component
LM5117PSQE
Public Unreviewedby Ray
Texas Instruments DC-DC Controllers, WQFN-24-EP(4x4). 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
markdownLM5117PSQE
Texas Instruments · DC-DC Controllers · WQFN-24-EP(4x4)
LM5117PSQE from Texas Instruments, in a WQFN-24-EP(4x4). 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 | DEMB | input | Optional logic input that enables diode emulation mode when held low; internal 50-kΩ pull-down enables diode emulation if pin is left floating. |
| 2 | RES | output | Restart timer pin configured by external capacitor; 10-μA internal current source charges to 1.25-V threshold after 256 consecutive cycles of current limiting. |
| 3 | SS | input | Soft-start pin charged by 10-μA internal current source; determines ramp rate of output voltage and is held low when VCC < 5V or UVLO < 1.25V. |
| 4 | RT | input | Oscillator programming pin; single external resistor sets switching frequency from 50kHz to 750kHz and can be synchronized to external clock. |
| 5 | AGND | power_in | Analog ground return for internal 0.8-V precision reference and all analog circuits. |
| 6 | NC | unconnected | No electrical connection. |
| 7 | VCCDIS | input | VCC regulator disable input; internal regulator is disabled when voltage exceeds 1.25V threshold with 500-kΩ internal pull-down resistor. |
| 8 | FB | input | Error amplifier feedback input with 0.8-V regulation threshold; external resistor divider from output sets regulated output voltage. |
| 9 | COMP | output | Error amplifier output node; loop compensation network (RCOMP, CCOMP, CHF) is connected between COMP and FB pins. |
| 10 | CM | output | Current monitor output providing average of sensed inductor current; monitor directly between CM and AGND with bandwidth approximately one-tenth of switching frequency. |
| 11 | RAMP | input | PWM ramp signal pin; external RC network (RRAMP, CRAMP) between SW, RAMP, and AGND generates emulated inductor current ramp with slope proportional to input voltage. |
| 12 | CS | input | Current sense amplifier input with 10V/V gain and 120-mV sense voltage threshold; connect to high-side of external current sense resistor. |
| 13 | CSG | power_in | Kelvin ground connection for current sense resistor; connect directly to low-side of external current sense resistor for accurate current measurement. |
| 14 | PGND | power_in | Power ground return for low-side NMOS gate driver; connect directly to current sense resistor ground and system return. |
| 15 | LO | output | Low-side NMOS gate drive output with 3.3-A sink current and 2.5-A source current; adaptive dead-time logic prevents simultaneous conduction with HO. |
| 16 | VCC | power_out | Bias supply output regulated to 7.6V by internal regulator or supplied externally when VCCDIS exceeds 1.25V threshold. |
| 17 | NC | unconnected | No electrical connection. |
| 18 | SW | output | Switching node of the buck regulator; common connection point for bootstrap capacitor, high-side NMOS source terminal, and low-side NMOS drain terminal. |
| 19 | HO | output | High-side NMOS gate drive output with 3.3-A sink current and 2.2-A source current; maximum low-state voltage drop 100mV. |
| 20 | HB | power_in | Bootstrap supply pin for high-side gate driver; connect to bootstrap diode cathode and bootstrap capacitor, typically maintains 7.6V above SW node. |
| 21 | NC | unconnected | No electrical connection. |
| 22 | VIN | power_in | Supply voltage input for internal VCC regulator; minimum VIN of 5.5V required for VCC regulation, maximum 65V absolute maximum rating. |
| 23 | NC | unconnected | No electrical connection. |
| 24 | UVLO | input | Undervoltage lockout programming pin with external resistor divider setting threshold; regulator shutdown below 0.4V, standby 0.4V-1.25V, normal operation above 1.25V. |
| 25 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-24-EP(4x4) |
| Category | Power Supply Chip |
| Pins | 25 |
CAD (KiCad official)
- Symbol:
LM5117PSQE - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm - 3D model: WQFN-24-EP(4x4) (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (49 pp, sha256
9e27f24e84faebf5, retrieved 2026-09-17, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).