component

RY9125

Public Made by Adom

by adom

RYCHIP DC-DC Converters, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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RY9125

RYCHIP · DC-DC Converters · SOT-23-6

RY9125 from RYCHIP, in a SOT-23-6. 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 GND power_in Ground pin for the regulator, which the datasheet asks to be connected to a large copper area for heat spreading.
2 SW output Switching pin; the SW voltage absolute maximum range is -0.3V to VIN+0.5V, and a capacitor from SW to BS forms the high-side driver supply.
3 IN power_in Power supply pin; the input voltage range is 4.5V to 17V, with an absolute maximum of 18V.
4 FB input Adjustable-version feedback input that connects to the center point of the external resistor divider, with VFB of 0.765V typical (0.746V to 0.784V).
5 EN input Logic enable: drive high (rising threshold 1.4V) to enable the IC, and drive low (falling threshold 0.8V) to disable it and enter micro-power shutdown mode.
6 BS passive Bootstrap pin; a capacitor connected between SW and BS is required to form a floating supply across the high-side switch driver.

Key specifications

Parameter Value
Manufacturer RYCHIP
Package SOT-23-6
Category Power Management (PMIC)
Pins 6

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input Voltage Range 4.5 17 V 4
Supply Current (Quiescent) 0.6 0.8 mA VEN =3.0V 4
Feedback Voltage 0.746 0.765 0.784 V 4
Under-Voltage Lockout Threshold Wake up VIN Voltage 4.3 4.5 V 4
Under-Voltage Lockout Threshold Shutdown VIN Voltage 3.6 3.8 V 4
Operating junction temperature (recommended) -40 125 °C 3
Operating temperature range -40 85 °C 3
Input voltage VIN 4.5 17 V 3
Output current 0 2 A 3
VIN voltage -0.3 18 V 3
EN voltage -0.3 18 V 3
SW voltage -0.3 V 3
BS voltage -0.3 V 3
FB voltage -0.3 6 V 3
Operating junction temperature, TJ TJ -40 150 °C 3
Storage temperature Tstg -55 150 °C 3
Lead Temperature (Soldering) 260 °C Soldering, 10 sec. 3
Supply Current (Shutdown) 4 uA VEN =0 or EN = GND 4
High-Side Switch On-Resistance 110 mΩ ISW=100mA 4
Low-Side Switch On-Resistance 70 mΩ ISW=-100mA 4
Valley Switch Current Limit 3 A 4
Over Voltage Protection Threshold 18 V 4
Switching Frequency 600 KHz 4
Maximum Duty Cycle 94 % VFB=90% 4
Minimum Off-Time 89 nS 4
EN Rising Threshold 1.4 V 4
EN Falling Threshold 0.8 V 4
Under-Voltage Lockout Hysteresis (VIN voltage) 500 mV 4
Soft Start 1.5 mS 4
Thermal Shutdown 160 ℃ 4
Thermal Hysteresis 30 ℃ 4
Junction-to-ambient thermal resistance RθJA 105 °C/W Note (1)(2): JESD 51-7; simulated on 4-layer JEDEC board 4
Junction-to-case (top) thermal resistance RθJC(top) 55 °C/W 4
Junction-to-board thermal resistance RθJB 17.5 °C/W 4
Junction-to-top characterization parameter ψJT 3.5 °C/W 4
Junction-to-board characterization parameter ψJB 17.5 °C/W 4

CAD (KiCad official)

  • Symbol: RY9125
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: ry9125-etched.step / ry9125-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ry9125.step / ry9125.glb are the bare package body.

Provenance

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

  • Datasheet: RYCHIP datasheet (13 pp, sha256 bc5ba35652bdb97c, retrieved 2026-10-19, 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