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SY58873UFAC

Public Made by Adom

by adom

Silergy Corp AC-DC Controllers And Regulators, SO-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SY58873UFAC

Silergy Corp · AC-DC Controllers And Regulators · SO-8

SY58873UFAC from Silergy Corp, in a SO-8. 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 CS passive Peak current limit set pin, which also carries the internal GM error amplifier output; the datasheet gives a CS limit of 550 mV (max) and an absolute maximum rating of -0.3 V to 3.6 V.
2 FB input Voltage feedback pin connected to a resistor divider that senses the boost output; the reference voltage is 1.229 V typ (1.211 V to 1.247 V) and the internal OVP threshold is 1.397 V typ (1.326 V to 1.468 V), with an absolute maximum rating of -0.3 V to 3.6 V.
3 GND power_in Ground pin for the device.
4 VCC power_in Power supply pin with a turn-on threshold of 12.9 V to 14.9 V, a turn-off threshold of 6.6 V to 8 V, a shunt voltage of 13.7 V to 15.6 V, and an absolute maximum rating of -0.3 V to 20 V.
5 LX passive Internal high-voltage MOSFET drain pin, rated for a breakdown voltage of 520 V.
6 LX passive Internal high-voltage MOSFET drain pin, rated for a breakdown voltage of 520 V.
7 LX passive Internal high-voltage MOSFET drain pin, rated for a breakdown voltage of 520 V.
8 LX passive Internal high-voltage MOSFET drain pin, rated for a breakdown voltage of 520 V.

Key specifications

Parameter Value
Manufacturer Silergy Corp
Package SO-8
Category Power Management (PMIC)
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
VCC Turn-on Threshold VVCC_ON 12.9 13.9 14.9 V 4
VCC Turn-off Threshold VVCC_OFF 6.6 7.3 8 V 4
VCC Shunt Voltage VVCC_SHUNT 13.7 14.65 15.6 V IVCC=2mA 4
Start up Current IST 49 57 65 µA VVCC=12V 4
Quiescent Current IQ 230 265 300 µA 4
Reference Voltage for Feedback VREF 1.211 1.229 1.247 V 4
Internal OVP Voltage Threshold VREF_OVP 1.326 1.397 1.468 V 4
Rdson of HV MOSFET RDSON 4.4 5.5 Ω 4
CS Limit VCS_LIMIT 550 mV 4
Min ON Time TON_MIN 670 ns 4
Max ON Time TON_MAX 12.5 µs 4
Min OFF Time TOFF_MIN 2 µs 4
Max OFF Time TOFF_MAX 54 µs 4
BV of HV MOSFET VBV 520 V 4
Thermal Shut Down Temperature TSD 160 ºC 4
CS pin voltage CS -0.3 3.6 V 3
FB pin voltage FB -0.3 3.6 V 3
VCC pin voltage VCC -0.3 20 V 3
LX pin voltage LX 520 V 3
Power Dissipation 1.1 W @ TA = 25°C, SO8 3
Maximum Junction Temperature 165 °C 3
Lead Temperature (Soldering, 10 sec.) 260 °C 10 sec. soldering 3
Storage Temperature Range -65 150 °C 3
Package Thermal Resistance, junction-to-ambient θJA 88 °C/W SO8 3
Package Thermal Resistance, junction-to-case θJC 45 °C/W SO8 3

CAD (KiCad official)

  • Symbol: SY58873UFAC
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SO-8 (KiCad packages3D, STEP)
  • 3D model files: sy58873ufac-etched.step / sy58873ufac-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sy58873ufac.step / sy58873ufac.glb are the bare package body.

Provenance

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

  • Datasheet: Silergy Corp datasheet (11 pp, sha256 d3bc4e134b824b06, retrieved 2026-10-18, 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