# LM3489QMM

**Texas Instruments** · DC-DC Controllers · VSSOP-8-0.65mm

LM3489QMM from Texas Instruments, in a VSSOP-8-0.65mm. 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 | ISENSE | input | Current sense input that must be connected to the PFET drain terminal directly or through a series resistor up to 600 Ω for 28 V > VIN > 35 V. |
| 2 | GND | power_in | Signal ground. |
| 3 | EN | input | Enable pin: connect to ground to shut down the part or float to enable operation (internally pulled high), and it can also be used for UVLO function. |
| 4 | FB | input | Feedback input that connects to a resistor voltage divider between the output and GND for an adjustable output voltage. |
| 5 | ADJ | input | Current limit threshold adjustment connected to an internal 5.5-µA current source, with a resistor to VIN whose voltage is compared with the ISENSE pin voltage to detect overcurrent. |
| 6 | PGND | power_in | Power ground. |
| 7 | PGATE | output | Gate drive output for the external PFET, swinging between VIN and VIN minus 5 V. |
| 8 | VIN | power_in | Power supply input pin, with a recommended operating range of 4.5 V to 35 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8-0.65mm |
| Category | Power Supply Chip |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Shutdown input supply current | ISHDN |  | 7 | 15 | µA | EN = 0 V | 5 |
| Enable threshold voltage | VEN | 1.15 | 1.5 | 1.85 | V | Enable rising | 5 |
| Enable threshold hysteresis | VEN_HYST |  | 130 |  | mV |  | 5 |
| Quiescent current at ground pin | IQ |  | 280 | 400 | µA | FB = 1.5 V (not switching) | 5 |
| Feedback voltage | VFB | 1.214 | 1.239 | 1.264 | V |  | 5 |
| Comparator hysteresis | VHYST |  | 10 | 20 | mV |  | 5 |
| Current limit comparator offset | VCL_OFFSET | -20 | 0 | 20 | mV | VFB = 1 V | 5 |
| Current limit ADJ current source | ICL_ADJ | 3 | 5.5 | 7 | µA | VFB = 1.5 V | 5 |
| Current limit one-shot off-time | TCL | 6 | 9 | 14 | µs | VADJ = 11.5 V, VISNS = 11 V, VFB = 1 V | 5 |
| FB pin bias current | IFB |  | 300 | 750 | nA | VFB = 1 V | 5 |
| Driver resistance, source | RPGATE |  | 5.5 |  | Ω | Source, ISOURCE = 100 mA | 5 |
| Driver resistance, sink | RPGATE |  | 8.5 |  | Ω | Sink, ISINK = 100 mA | 5 |
| Driver output current, source | IPGATE |  | 0.44 |  | A | Source, VIN = 7 V, PGATE = 3.5 V | 5 |
| Driver output current, sink | IPGATE |  | 0.1 |  | A | Sink, VIN = 7 V, PGATE = 3.5 V | 5 |
| Minimum ON time in normal operation | TONMIN_NOR |  | 100 |  | ns | VISNS = VADJ + 0.1 V, Cload on OUT = 1000 pF | 5 |
| Minimum ON time in current limit | TONMIN_CL |  | 200 |  | ns | VISNS = VADJ, 0.1 V, VFB = 1 V, Cload on OUT = 1000 pF | 5 |
| Feedback voltage line regulation | %VFB/ΔVIN |  | 0.01 |  | %/V | 4.5 V ≤ VIN ≤ 35 V | 5 |
| VIN voltage | VIN | -0.3 |  | 36 | V |  | 4 |
| PGATE voltage | PGATE | -0.3 |  | 36 | V |  | 4 |
| FB voltage | FB | -0.3 |  | 5 | V |  | 4 |
| ISENSE voltage | ISENSE | -1 |  | 36 | V |  | 4 |
| ADJ voltage | ADJ | -0.3 |  | 36 | V |  | 4 |
| EN voltage | EN | -0.3 |  | 6 | V |  | 4 |
| Power dissipation | PD |  |  | 417 | mW | TA = 25°C | 4 |
| Junction temperature | TJ | -40 |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| ESD HBM (LM3489-Q1) | V(ESD) | -2000 |  | 2000 | V | Human body model, per AEC Q100-002 | 4 |
| ESD CDM (LM3489-Q1) | V(ESD) | -750 |  | 750 | V | Charged device model, per AEC Q100-011 | 4 |
| Supply voltage | VIN | 4.5 |  | 35 | V |  | 4 |
| EN voltage | EN |  |  | 5.5 | V |  | 4 |
| Operating junction temperature (LM3489-Q1) | TJ | -40 |  | 150 | °C | LM3489-Q1 | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 163.7 |  | °C/W | DGK (VSSOP) 8 pins | 5 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 56.6 |  | °C/W | DGK (VSSOP) 8 pins | 5 |
| Junction-to-board thermal resistance | RθJB |  | 83.3 |  | °C/W | DGK (VSSOP) 8 pins | 5 |
| Junction-to-top characterization parameter | ψJT |  | 5.4 |  | °C/W | DGK (VSSOP) 8 pins | 5 |
| Junction-to-board characterization parameter | ψJB |  | 82 |  | °C/W | DGK (VSSOP) 8 pins | 5 |

## CAD (KiCad official)

- Symbol: `LM3489QMM`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8-0.65mm (KiCad packages3D, STEP)
- 3D model files: `lm3489qmm-etched.step` / `lm3489qmm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm3489qmm.step` / `lm3489qmm.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/lm3489-q1) (28 pp, sha256 `8486c86e0ce9150d`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/lm3489qmm-datasheet.pdf)