component
U0219
Public Made by Adomby adom
UNI-SEMI DC-DC Converters, SOT-23-6. 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
markdownU0219
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);u0219.step/u0219.glbare 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, primaryclaude-sonnet-5-5(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).