component
SK6637
Public Made by Adomby adom
Suntek DC-DC Converters, SOT-563. 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
markdownSK6637
Suntek · DC-DC Converters · SOT-563
SK6637 from Suntek, in a SOT-563. 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 | IN | power_in | Power supply pin; the recommended input voltage range is 4.5 V to 17 V and the absolute maximum VIN is 19 V. |
| 2 | SW | power_out | Switching pin (phase node of the internal power MOSFETs); SW voltage is limited to -0.3 V to VIN+1 V, or -5 V to VIN+2 V for 10 ns transients. |
| 3 | GND | power_in | Ground pin, which the datasheet recommends connecting to a large copper area to cool the chip. |
| 4 | BS | passive | Bootstrap pin; a capacitor must be connected between SW and BS to form the floating high-side driver supply, with BS voltage limited to -0.3 V to VSW+5 V. |
| 5 | EN | input | Enable input; drive high to enable the IC and low to disable it into micro-power shutdown, with a 1.4 V rising threshold, 0.8 V falling threshold, and absolute maximum of -0.3 V to 19 V. |
| 6 | FB | input | Adjustable-version feedback input, connected to the center point of the external resistor divider; the feedback voltage is 0.805 V nominal and the absolute maximum is -0.3 V to 6 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Suntek |
| Package | SOT-563 |
| 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 | 0.784 | 0.805 | 0.825 | 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 | |||
| Supply Current (Shutdown) | 4 | uA | VEN =0 or EN = GND | 4 | |||
| High-Side Switch On-Resistance | 63 | mΩ | ISW=100mA | 4 | |||
| Low-Side Switch On-Resistance | 36 | mΩ | ISW=-100mA | 4 | |||
| Valley Switch Current Limit | 4 | A | 4 | ||||
| Over Voltage Protection Threshold | 19 | V | 4 | ||||
| Switching Frequency | 800 | 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 | ||||
| Hysteresis VIN voltage | 500 | mV | 4 | ||||
| Soft Start | 1.5 | mS | 4 | ||||
| Thermal Shutdown | 160 | ℃ | 4 | ||||
| Thermal Hysteresis | 30 | ℃ | 4 | ||||
| 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 | 3 | A | 3 | |||
| VIN, EN voltage | -0.3 | 19 | V | 3 | |||
| SW voltage | -0.3 | V | 3 | ||||
| SW voltage (10 ns transient) | -5 | V | 10 ns 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, 10sec.) | 260 | °C | Soldering, 10 sec. | 3 | |||
| Junction-to-ambient thermal resistance | RθJA | 155 | °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 | 30 | °C/W | 4 | |||
| Junction-to-top characterization parameter | ψJT | 2.5 | °C/W | 4 | |||
| Junction-to-board characterization parameter | ψJB | 31 | °C/W | 4 |
CAD (KiCad official)
- Symbol:
SK6637 - Footprint:
Package_TO_SOT_SMD:SOT-563 - 3D model: SOT-563 (KiCad packages3D, STEP)
- 3D model files:
sk6637-etched.step/sk6637-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sk6637.step/sk6637.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Suntek datasheet (14 pp, sha256
0951c873a30a59a2, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).