# LM5088QMHX-1

**Texas Instruments** · DC-DC Controllers · HTSSOP-16-EP

LM5088QMHX-1 from Texas Instruments, in a HTSSOP-16-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 | VIN | power_in | IC supply voltage with an operating range of 4.5 V to 75 V. |
| 2 | EN | input | Below 0.4 V the regulator is in a low-power state, 0.4 V to 1.2 V selects standby, and above 1.2 V the controller is operational; a 5-µA pullup forces the pin high if left open. |
| 3 | SS | passive | An internal 11-µA source charges an external capacitor to set the start-up rate, the pin controls the error amplifier while below the 1.2-V reference, and it is held low in standby, VCC UVLO and thermal shutdown. |
| 4 | RAMP | passive | An external capacitor from this pin to GND sets the emulated current-mode ramp slope, with a recommended range of 100 pF to 2000 pF. |
| 5 | RT/SYNC | input | A single resistor to GND programs the oscillator over the recommended 50 kHz to 1 MHz range, and an external sync signal higher in frequency can be coupled through a small capacitor, with the RT resistor still required. |
| 6 | GND | power_in | Ground return. |
| 7 | COMP | output | Output of the internal error amplifier, with the loop compensation network connected between this pin and FB. |
| 8 | FB | input | Inverting input of the internal error amplifier, with a regulation threshold of 1.205 V. |
| 9 | OUT | input | Output voltage connection, to be connected directly to the regulated output voltage. |
| 10 | DITH | passive | A capacitor to GND is charged and discharged by 27-µA sources to modulate the oscillator between -5% and +5% of nominal frequency, and grounding this pin disables dithering (LM5088-1 only). |
| 11 | CSG | passive | Low-side reference for the current sense resistor. |
| 12 | CS | input | Current measurement input for the re-circulating diode, sensing diode current at the end of the buck off time to provide the emulated ramp DC offset. |
| 13 | SW | passive | Connect to the source terminal of the external MOSFET switch; absolute maximum SW to GND is -2 V to 76 V. |
| 14 | HG | output | Connect to the gate terminal of the external MOSFET switch; HG to SW is limited to -0.3 V to BOOT + 0.3 V. |
| 15 | BOOT | passive | An external bootstrap capacitor is required between BOOT and SW, charged from VCC through an internal diode during the buck off-time; BOOT to SW is limited to 16 V. |
| 16 | VCC | power_out | Output of the bias regulator that tracks VIN up to 7.8 V typical and needs a 0.1-µF to 10-µF ceramic decoupling capacitor; an external voltage of 8.3 V to 13 V can be applied to reduce internal dissipation. |
| 17 | EP | passive | Exposed pad, electrically isolated, which must be soldered to the ground plane to reduce thermal resistance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | HTSSOP-16-EP |
| Category | Power Supply Chip |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `LM5088QMHX-1`
- Footprint: `Package_SO:TSSOP-16-1EP_4.4x5mm_P0.65mm`
- 3D model: HTSSOP-16-EP (KiCad packages3D, STEP)
- 3D model files: `lm5088qmhx-1-etched.step` / `lm5088qmhx-1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm5088qmhx-1.step` / `lm5088qmhx-1.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/lm5088) (45 pp, sha256 `8c5931b7d7c79ed7`, retrieved 2026-10-10, 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`, 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/lm5088qmhx-1-datasheet.pdf)