component

RY9121E

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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RY9121E

RYCHIP · DC-DC Converters · SOT-23-6

RY9121E 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 BS power_out Bootstrap pin: a capacitor must be connected between SW and BS to form the floating supply for the high-side switch driver; the datasheet's absolute maximum for BS is Vsw+5V.
2 GND power_in Ground pin for the regulator, which the layout guidance says should be connected to a large copper area for heat removal.
3 FB input Adjustable-version feedback input, connected to the center point of the external resistor divider; the reference is 0.585 V to 0.615 V (0.600 V typical) and the absolute maximum is -0.3 V to 6 V.
4 EN input Enable input: drive to logic-high to enable the IC and to logic-low to disable it into micro-power shutdown mode (rising threshold 1.4 V, falling threshold 0.8 V).
5 IN power_in Power supply pin for the regulator, with an input voltage range of 4.5 V to 17 V and an absolute maximum of 18 V.
6 SW output Switching node pin driving the inductor; the absolute maximum is -0.3 V to VIN+1.0 V (-5 V to VIN+2.0 V for 10 ns transients).

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
VIN voltage VIN -0.3 18 V 3
EN voltage -0.3 18 V 3
SW voltage -0.3 V 3
SW voltage (10ns transient) -5 V 10ns transient 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, 10sec. 3
Operating junction temperature -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
Input Voltage Range 4.5 17 V 4
Feedback Voltage 0.585 0.6 0.615 V 4
Supply Current (Quiescent) 0.6 0.8 mA VEN =3.0V 4
Under-Voltage Lockout Wake up VIN Voltage 4.3 4.5 V 4
Under-Voltage Lockout Shutdown VIN Voltage 3.6 3.8 V 4
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 2 A 4
Output Current 2.1 A VOUT=5V with L=4.7uH 4
Over Voltage Protection Threshold 18 V 4
Switching Frequency 1.2 MHz 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
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 JESD 51-7, 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

CAD (KiCad official)

  • Symbol: RY9121E
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: ry9121e-etched.step / ry9121e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ry9121e.step / ry9121e.glb are the bare package body.

Provenance

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

  • Datasheet: RYCHIP datasheet (13 pp, sha256 6617e5be3de43393, retrieved 2026-10-31, 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