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U0219

Public Made by Adom

by adom

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

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U0219

UNI-SEMI · DC-DC Converters · SOT-23-6

U0219 from UNI-SEMI, 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 passive Bootstrap pin; a capacitor connected between SW and BST pins is required to form a floating supply across the high-side switch driver (VBS range Vsw-0.3 to Vsw+5 V).
2 GND power_in Ground pin.
3 FB input Adjustable-version feedback input; connect FB to the center point of the external resistor divider (regulated feedback voltage 0.6 V typ, abs max -0.3 to 6 V).
4 EN input Drive to logic-high to enable the IC and logic-low to disable it and enter micro-power shutdown mode (rising threshold 1.15 to 1.25 V, abs max -0.3 to 21 V).
5 IN power_in Power supply pin with 4 V to 18 V operating input range (abs max -0.3 to 21 V).
6 SW output Switching pin (abs max -0.3 to VIN+0.5 V).

Key specifications

Parameter Value
Manufacturer UNI-SEMI
Package SOT-23-6
Category Power Supply Chip
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 VIN 4 18 V 4
Supply Current in Operation 0.4 0.8 mA VEN=3.0V, VFB=1.1V 4
Supply Current in Shutdown 10 uA VEN =0 or EN = GND 4
Regulated Feedback Voltage VFB 0.585 0.6 0.615 V TJ=-40°C to +125°C 4
High-Side Switch Leakage Current 10 uA VEN=0V, VSW=0V 4
VIN Under-Voltage Lockout Threshold INUVTH 3.5 3.8 V 4
EN Rising ON-Time VEN-Rising 1.15 1.25 V VEN-Rising 4
Soft Start 1 2 mS 4
Hiccup Frequency 80 120 Hz VOUT = 3.3V, VIN = 12V 4
VIN, EN Voltage -0.3 21 V 4
VSW Voltage VSW -0.3 V max printed as (VIN+0.5) 4
VFB Voltages VFB -0.3 6 V 4
Operating Temperature Range -40 85 °C 4
Storage Temperature Range -65 150 °C 4
Lead Temperature (Soldering, 10s) 300 °C Soldering, 10s 4
Junction Temperature 150 °C 4
ESD (Human Body Mode) HMB 2 KV 4
ESD (Machine Mode) MM 200 V 4
Thermal Resistance Junction to Ambient 170 °C/W 4
Thermal Resistance Junction to Case 110 °C/W 4
High-Side Switch On-Resistance 110 mΩ 4
Low-Side Switch On-Resistance 70 mΩ 4
Upper Switch Current Limit 3 A Minimum Duty Cycle 4
Oscillation Frequency 500 KHz 4
Maximum Duty Cycle 92 % VFB=0.6V 4
Minimum On-Time 60 nS 4
Minimum Off-Time 90 nS 4
EN Input Current 1 uA VEN=2V 4
EN Input Current 0 uA VEN=0V 4
VIN Under-Voltage Lockout Hysteresis INUVHYS 200 mV 4
EN Falling Off-Time VEN-Falling 1.05 V VEN-Falling 4
Hiccup Duty cycle 40 % VOUT = 3.3V, VIN = 12V 4
Thermal Shutdown 160 ℃ 4
Thermal Hysteresis 20 ℃ 4

CAD (KiCad official)

  • Symbol: U0219
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: u0219-etched.step / u0219-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); u0219.step / u0219.glb are the bare package body.

Provenance

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

  • Datasheet: UNI-SEMI datasheet (12 pp, sha256 6b499bf74c1baf2a, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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