LM2677S-5.0

Texas Instruments · DC-DC Converters · TO-263-7

LM2677S-5.0 from Texas Instruments, in a TO-263-7. 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	VSW	output	Source pin of the internal high-side FET and the switching node, to be connected to the inductor and the cathode of the external diode; the switch voltage to ground is limited to -1 V up to VIN (DC), with brief negative pulses per the absolute maximum footnote.
2	VIN	power_in	Supply input to the collector of the high-side FET, which must connect to the power supply and input bypass capacitor CIN with the VIN-to-CIN-to-GND path kept as short as possible; the supply voltage range is 8 V to 40 V.
3	CB	input	Boot-strap capacitor connection for the high-side driver, which requires a high quality 100-nF capacitor connected from CB to VSW.
4	GND	power_in	Power ground pin to be connected to system ground, with the path to CIN kept as short as possible and the ground pins of CIN and COUT tied to it.
5	SYNC	input	Allows control of the switching clock frequency within the 280 kHz to 400 kHz external sync range; if left open-circuited the regulator switches at the internal oscillator frequency, typically 260 kHz.
6	FB	input	Feedback sense input, connected to the midpoint of the feedback divider to set VOUT for the ADJ version or directly to the output capacitor for fixed-output versions such as the 5.0 V part; the feedback pin voltage is rated -0.3 V to 14 V.
7	ON/OFF	input	Enable input where high or floating enables the regulator and low disables it into the roughly 50 µA standby state; the pin voltage is rated -0.1 V to 6 V.
8	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TO-263-7
Category	Power Management (PMIC)
Pins	8

CAD (KiCad official)

Symbol: LM2677S-5.0
Footprint: Package_TO_SOT_SMD:TO-263-7_TabPin8
3D model: TO-263-7 (KiCad packages3D, STEP)
3D model files: lm2677s-5-0-etched.step / lm2677s-5-0-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm2677s-5-0.step / lm2677s-5-0.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (37 pp, sha256 67567c9c5d763168, retrieved 2026-10-08, tier: lcsc)
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

# LM2677S-5.0

**Texas Instruments** · DC-DC Converters · TO-263-7

LM2677S-5.0 from Texas Instruments, in a TO-263-7. 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 | VSW | output | Source pin of the internal high-side FET and the switching node, to be connected to the inductor and the cathode of the external diode; the switch voltage to ground is limited to -1 V up to VIN (DC), with brief negative pulses per the absolute maximum footnote. |
| 2 | VIN | power_in | Supply input to the collector of the high-side FET, which must connect to the power supply and input bypass capacitor CIN with the VIN-to-CIN-to-GND path kept as short as possible; the supply voltage range is 8 V to 40 V. |
| 3 | CB | input | Boot-strap capacitor connection for the high-side driver, which requires a high quality 100-nF capacitor connected from CB to VSW. |
| 4 | GND | power_in | Power ground pin to be connected to system ground, with the path to CIN kept as short as possible and the ground pins of CIN and COUT tied to it. |
| 5 | SYNC | input | Allows control of the switching clock frequency within the 280 kHz to 400 kHz external sync range; if left open-circuited the regulator switches at the internal oscillator frequency, typically 260 kHz. |
| 6 | FB | input | Feedback sense input, connected to the midpoint of the feedback divider to set VOUT for the ADJ version or directly to the output capacitor for fixed-output versions such as the 5.0 V part; the feedback pin voltage is rated -0.3 V to 14 V. |
| 7 | ON/OFF | input | Enable input where high or floating enables the regulator and low disables it into the roughly 50 µA standby state; the pin voltage is rated -0.1 V to 6 V. |
| 8 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-263-7 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM2677S-5.0`
- Footprint: `Package_TO_SOT_SMD:TO-263-7_TabPin8`
- 3D model: TO-263-7 (KiCad packages3D, STEP)
- 3D model files: `lm2677s-5-0-etched.step` / `lm2677s-5-0-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2677s-5-0.step` / `lm2677s-5-0.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/lm2677) (37 pp, sha256 `67567c9c5d763168`, retrieved 2026-10-08, tier: lcsc)
- **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/lm2677s-5-0-datasheet.pdf)