component
L5991D
Public Made by Adomby adom
STMicroelectronics AC-DC Controllers And Regulators, SO-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownL5991D
STMicroelectronics · AC-DC Controllers And Regulators · SO-16
L5991D from STMicroelectronics, in a SO-16. 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 | SYNC | bidirectional | Synchronization pulse input/output for master-slave PWM cycle control or oscillator frequency synchronization. |
| 2 | RCT | passive | Oscillator timing pin for external RC frequency-setting components (RA, RB, CT). |
| 3 | DC | input | Duty cycle control input voltage (1-3V nominal) setting maximum PWM duty cycle from 0% to Dx. |
| 4 | VREF | power_out | 5.0V ±1.5% reference voltage output capable of supplying external circuit biasing networks. |
| 5 | VFB | input | Error amplifier inverting input for feedback voltage comparison with internal 2.5V reference. |
| 6 | COMP | output | Error amplifier output for frequency compensation network connection and standby operation monitoring. |
| 7 | SS | passive | Soft-start capacitor connection node charged during power-up to approximately 7V for current-limiting control. |
| 8 | VCC | power_in | Controller signal supply voltage input (12-20V typical, ICC<50mA), with internal 25V Zener clamp. |
| 9 | VC | power_in | Power stage driver supply voltage input (12-20V typical) with high pulsed current capability for gate drive. |
| 10 | OUT | output | High-current totem-pole gate driver output for external power MOSFET with 1A peak drive capability and 13V internal clamp. |
| 11 | PGND | power_in | Power section ground return path for gate driver current loop closure. |
| 12 | SGND | power_in | Signal section ground reference for control and feedback circuits. |
| 13 | ISEN | input | Current sense input connected to primary switch sense resistor for pulse-by-pulse current limiting with 100ns leading-edge blanking. |
| 14 | DIS | input | Disable control input that shuts down IC when voltage exceeds 2.5V; must be tied to SGND if unused. |
| 15 | DC-LIM | input | Maximum duty cycle limit control; tie to VREF for 50% maximum duty cycle or leave floating for unrestricted maximum. |
| 16 | ST-BY | passive | Standby function control pin with external resistor RB for light-load oscillator frequency reduction. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-16 |
| Category | Power Management (PMIC) |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
L5991D - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SO-16 (KiCad packages3D, STEP)
- 3D model files:
l5991d-etched.step/l5991d-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);l5991d.step/l5991d.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (23 pp, sha256
cbc01f22c7c35f41, retrieved 2026-10-05, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).