# LM25576MH

**Texas Instruments** · DC-DC Converters · HTSSOP-20-EP

LM25576MH from Texas Instruments, in a HTSSOP-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 | VCC | power_out | Bias regulator output that follows VIN below 9 V and regulates to about 7 V above 9 V; needs a 0.1 µF to 1 µF ceramic decoupling capacitor, and an external 7.5 V to 14 V may be applied to reduce power dissipation, with VCC never allowed to exceed VIN. |
| 2 | SD | input | Shutdown/UVLO input: below 0.7 V the regulator is in low-power shutdown, 0.7 V to 1.225 V gives standby, above 1.225 V it operates; an internal 5 µA pull-up applies when open and SD must never exceed 14 V. |
| 3 | VIN | power_in | Input supply pin with a nominal operating range of 6 V to 42 V and an absolute maximum of 45 V. |
| 4 | VIN | power_in | Input supply pin, the second VIN pin, with a nominal operating range of 6 V to 42 V and an absolute maximum of 45 V. |
| 5 | SYNC | bidirectional | Oscillator synchronization input/output that can be driven by an external open-drain clock with pulses longer than 15 ns, and may be tied to other LM25576 devices to synchronize them; SYNC to GND is limited to 7 V. |
| 6 | COMP | output | Internal error amplifier output; the loop compensation network connects between this pin and FB. |
| 7 | FB | input | Feedback input to the inverting input of the internal error amplifier, with a regulation threshold of 1.225 V and a 7 V absolute maximum. |
| 8 | RT | input | Oscillator frequency-setting pin; a single resistor from RT to AGND sets the switching frequency between 50 kHz and 1 MHz. |
| 9 | RAMP | output | Slope-compensation ramp pin; a capacitor between RAMP and AGND, recommended 50 pF to 2000 pF, sets the emulated current-ramp slope, with a 7 V absolute maximum. |
| 10 | AGND | power_in | Analog ground and internal reference for the regulator control functions; resistors and small-signal capacitors (RT, SS, RAMP) must return directly to this pin. |
| 11 | SS | output | Soft-start pin; an external capacitor with the internal 10 µA source sets the reference rise time, and the pin is held low during standby, VCC UVLO and thermal shutdown, with a 7 V absolute maximum. |
| 12 | OUT | output | Output voltage sense connection, connected directly to the regulated output voltage; OUT to GND is limited by VIN. |
| 13 | PGND | power_in | Power ground, the low-side reference for the power switch and the IS sense resistor. |
| 14 | PGND | power_in | Power ground, the second PGND pin, serving as the low-side reference for the power switch and the IS sense resistor. |
| 15 | IS | input | Recirculating diode current-sense connection to the internal sense resistor and sample-and-hold, which senses diode current at the end of the off-time and sets the DC level of the emulated ramp. |
| 16 | IS | input | Recirculating diode current-sense connection, the second IS pin, tied to the same internal sense resistor and sample-and-hold as pin 15. |
| 17 | SW | output | Switch node, the source terminal of the internal buck switch, which must connect to the external Schottky diode and buck inductor; steady-state SW to GND is limited to -1.5 V. |
| 18 | SW | output | Switch node, the second SW pin, which must connect to the external Schottky diode and buck inductor. |
| 19 | PRE | input | Bootstrap precharge assist pin, an open-drain connection to SW that lets an internal 70 Ω precharge MOSFET charge the BST capacitor for 265 ns each cycle before on-time; PRE to GND is limited to 45 V. |
| 20 | BST | input | Bootstrap boost input; a 0.022 µF ceramic capacitor between BST and SW is recommended, and BST to SW is limited to 14 V. |
| 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-EP |
| Category | Power Management (PMIC) |
| Pins | 21 |

## CAD (KiCad official)

- Symbol: `LM25576MH`
- Footprint: `Package_SO:TSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP2.15x3.35mm`
- 3D model: HTSSOP-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: `lm25576mh-etched.step` / `lm25576mh-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm25576mh.step` / `lm25576mh.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/lm25576) (37 pp, sha256 `ed0031dc76d29d88`, retrieved 2026-10-08, 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/lm25576mh-datasheet.pdf)