component

L7987TR

Public Made by Adom

by adom

STMicroelectronics DC-DC Converters, HTSSOP-16-EP. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpmicl7987tr
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.

Symbol & Footprint

Schematic Symbol

Open full view ↗
Loads on click. Unloads only if this page sits in the background.

PCB Footprint

Open full view ↗
Loads on click. Unloads only if this page sits in the background.

Datasheet

Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.
Download PDF
Contents

README

markdown

L7987TR

STMicroelectronics · DC-DC Converters · HTSSOP-16-EP

L7987TR from STMicroelectronics, in a HTSSOP-16-EP. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VBIAS power_in Auxiliary input to supply part of the analog circuitry to increase efficiency at light load. Typically tied to the regulated output voltage or an external rail higher than 3 V; connect to signal GND (or bypass with a 1 uF ceramic) if unused.
2 VIN power_in DC input voltage (4.5 V to 61 V operating range). Tie both VIN pins together at the package.
3 VIN power_in DC input voltage (4.5 V to 61 V operating range). Tie both VIN pins together at the package.
4 VCC power_in Filtered DC input voltage to the internal circuitry. Bypass to signal GND with a 1 uF ceramic capacitor.
5 EN input Active-high enable pin (device OFF <= 0.30 V, ON >= 0.35 V). Connect to VCC if not used.
6 SS passive Soft-start pin. An internal 5 uA typ. current source charges an external capacitor from this pin to set the soft-start time.
7 SYNCH bidirectional Master/slave synchronization pin. Sources a pulse when configured as master and accepts an external sync input (>=280 kHz) when configured as slave; up to 5 slave devices can share this line.
8 COMP output Error-amplifier output. Compensation network (Type II or Type III) is connected between COMP and FB/GND to shape the loop response.
9 FB input Inverting input of the error amplifier (VFB = 0.8 V typ.). Connect to the output resistor divider to set the regulated output voltage.
10 FSW passive Switching-frequency programming pin. A pull-down resistor to GND selects the switching frequency (250 kHz - 1.5 MHz); leaving FSW floating sets ~250 kHz.
11 ILIM passive Peak-current-limit programming pin. A pull-down resistor to GND selects the inductor peak current limit; floating ILIM yields the default ~4.0 A limit.
12 PGOOD output Open-collector power-good output. Pulled low when the FB voltage is out of regulation (rising threshold 0.70 V typ., 30 mV hysteresis); requires an external pull-up.
13 LX power_out Switching node (output of the internal high-side n-DMOS). Tie both LX pins together and connect to the external inductor and freewheeling diode.
14 LX power_out Switching node (output of the internal high-side n-DMOS). Tie both LX pins together and connect to the external inductor and freewheeling diode.
15 BOOT passive Bootstrap pin for the high-side gate drive. Connect a 100 nF ceramic capacitor (typ.) between BOOT and LX; the internal regulator refreshes the boot capacitor during the off-time.
16 GND power_in Signal ground reference for the internal analog circuitry.
17 EP power_in Exposed thermal pad on package underside. Must be connected to signal GND and to a large copper area for heat dissipation (RthJA = 40 C/W on demo board).

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package HTSSOP-16-EP
Category PMIC
Pins 17

Ordering variants

Same part, different packaging or reel option.

  • L7987TR

CAD (KiCad official)

  • Symbol: L7987TR
  • Footprint: Package_SO:TSSOP-16-1EP_4.4x5mm_P0.65mm
  • 3D model: HTSSOP-16-EP (KiCad packages3D, STEP)
  • 3D model files: l7987tr-etched.step / l7987tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); l7987tr.step / l7987tr.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (37 pp, sha256 9ea1c120a6bc8ac2, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF