component
LM5122QMH
Public Made by Adomby adom
Texas Instruments DC-DC Controllers, HTSSOP-20. 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
markdownLM5122QMH
Texas Instruments · DC-DC Controllers · HTSSOP-20
LM5122QMH from Texas Instruments, in a HTSSOP-20. 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 a 180° shifted clock for interleaved operation, and it can be left floating when not used. |
| 2 | OPT | input | Clock synchronization selection pin that also enables or disables SYNCOUT for master/slave configuration, and it should not be left floating. |
| 3 | CSN | input | Inverting input of the current sense amplifier, connected to the negative side of the current sense resistor. |
| 4 | CSP | input | Non-inverting input of the current sense amplifier, connected to the positive side of the current sense resistor. |
| 5 | VIN | power_in | Supply voltage input for the VCC regulator, connected to the input capacitor with short, low-impedance paths. |
| 6 | UVLO | input | Undervoltage lockout programming pin: below 0.4 V the regulator shuts down, 0.4 V to 1.2 V gives standby, and above 1.2 V starts the start-up sequence; it should not be left floating. |
| 7 | SS | input | Soft-start programming pin, where an external capacitor and an internal 10 µA current source set the ramp rate of the error amplifier reference. |
| 8 | SYNCIN/RT | input | Oscillator frequency programming pin set by a single resistor to AGND, which also accepts a positive pulse for external synchronization; the recommended maximum master oscillator frequency is 2 MHz, giving 1 MHz maximum switching frequency. |
| 9 | AGND | power_in | Analog ground connection and return for the internal voltage reference and analog circuits. |
| 10 | FB | input | Inverting input of the internal error amplifier with a 1.2 V regulation threshold, and the controller is configured as slave mode if FB is above 2.7 V at initial power-on. |
| 11 | COMP | output | Output of the internal error amplifier, with the loop compensation network connected between this pin and FB. |
| 12 | SLOPE | input | Slope compensation programmed by a single resistor between SLOPE and AGND. |
| 13 | MODE | input | Switching mode selection pin, where a voltage above the 1.2 V threshold forces PWM mode and below 1.2 V selects diode emulation mode, with a 700 kΩ pullup and 100 kΩ pulldown holding it at 0.15 V by default. |
| 14 | RES | output | Restart timer pin for an external capacitor that sets hiccup-mode off-time and restart delay during overload, and it should connect directly to AGND when hiccup mode is not required. |
| 15 | PGND | power_in | Power ground connection for the low-side N-channel MOSFET gate driver, connected directly to the source of the low-side MOSFET. |
| 16 | LO | output | Low-side N-channel MOSFET gate drive output, connected to the low-side MOSFET gate through a short, low-inductance path. |
| 17 | VCC | power_out | VCC bias supply pin that must be locally decoupled to PGND with a low ESR/ESL capacitor placed as close as possible to the controller. |
| 18 | SW | bidirectional | Switching node of the boost regulator, connected to the bootstrap capacitor, the high-side MOSFET source, and the low-side MOSFET drain through short, low-inductance paths. |
| 19 | HO | output | High-side N-channel MOSFET gate drive output, connected to the high-side synchronous MOSFET gate through a short, low-inductance path. |
| 20 | BST | power_out | High-side driver bootstrap supply, connected to the bootstrap diode cathode and bootstrap capacitor, with an internal charge pump supplying 200 µA for 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 | HTSSOP-20 |
| Category | Power Supply Chip |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
LM5122QMH - Footprint:
Package_SO:TSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP2.15x3.35mm - 3D model: HTSSOP-20, 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:
lm5122qmh-etched.step/lm5122qmh-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm5122qmh.step/lm5122qmh.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 2026-10-11, 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 0.3, primaryclaude-haiku-5-5(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).