component
LM5122QMHX
Public Made by Adomby adom
Texas Instruments DC-DC Converters, TSSOP-20-EP. Pinout cross-checked by two models against the datasheet, 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
markdownLM5122QMHX
Texas Instruments · DC-DC Converters · TSSOP-20-EP
LM5122QMHX from Texas Instruments, in a TSSOP-20-EP. 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 | SYNCOUT | output | Clock output providing 180° phase shift for multiphase operation that may be left floating when unused. |
| 2 | OPT | input | Clock synchronization selection pin controlling master/slave configuration, must not be left floating. |
| 3 | CSN | input | Inverting input of current sense amplifier connected to the negative side of the sense resistor. |
| 4 | CSP | input | Non-inverting input of current sense amplifier connected to the positive side of the sense resistor. |
| 5 | VIN | power_in | Supply voltage input to internal VCC regulator accepting input voltages from 4.5V to 65V. |
| 6 | UVLO | input | Undervoltage lockout programming pin with shutdown (below 0.4V), standby (0.4V to 1.2V), and startup (above 1.2V) threshold modes. |
| 7 | SS | input | Soft-start programming pin with internal 10-μA current source controlling output voltage ramp rate during startup. |
| 8 | SYNCIN/RT | input | Oscillator synchronization input and timing resistor pin for frequency programming and external clock synchronization up to 2 MHz. |
| 9 | AGND | power_in | Analog ground connection providing return path for internal voltage reference and analog circuits. |
| 10 | FB | input | Feedback inverting input with 1.2V regulation threshold; sets output voltage via external resistor divider and enables slave mode if above 2.7V at power-on. |
| 11 | COMP | output | Error amplifier output node for connection of Type 2 compensation network to feedback pin. |
| 12 | SLOPE | input | Slope compensation programming pin with amplitude set by external resistor to AGND for prevention of sub-harmonic oscillation. |
| 13 | MODE | input | Switching mode selection with internal pullup/pulldown resistors that enable forced PWM mode (above 1.2V) or diode-emulation mode (below 1.2V). |
| 14 | RES | output | Restart timer pin with external capacitor for hiccup-mode off-time and restart delay programming during overload conditions. |
| 15 | PGND | power_in | Power ground connection pin for low-side gate driver that must connect directly to the low-side MOSFET source terminal. |
| 16 | LO | output | Low-side N-channel MOSFET gate driver output with 3A peak source/sink current capability requiring short low-inductance connection to gate. |
| 17 | VCC | power_in | Bias supply output from internal 7.6V regulator powering controller and drivers, decouple to PGND with low-ESR ceramic capacitor. |
| 18 | SW | bidirectional | Boost converter switching node connecting bootstrap capacitor and both MOSFET switches via short low-inductance paths for noise minimization. |
| 19 | HO | output | High-side N-channel MOSFET gate driver output with 3.2A peak source/sink current at 7.6V requiring short low-inductance connection to gate. |
| 20 | BST | power_in | Bootstrap gate-drive supply pin charged by internal 200-μA pump that maintains high-side driver supply for 100% duty-cycle bypass operation. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20-EP |
| Category | Power Management (PMIC) |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
LM5122QMHX - Footprint:
Package_SO:TSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP2.15x3.35mm - 3D model: TSSOP-20-EP, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.2 mm nominal TSSOP height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files:
lm5122qmhx-etched.step/lm5122qmhx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm5122qmhx.step/lm5122qmhx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (50 pp, sha256
89895d7bdb8309ba, retrieved 2026-10-01, 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-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).