component
SSP9459
Public Made by Adomby adom
Shanghai Siproin Microelectronics DC-DC Converters, SOT-23-6. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Contents
README
markdownSSP9459
Shanghai Siproin Microelectronics · DC-DC Converters · SOT-23-6
SSP9459 from Shanghai Siproin Microelectronics, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BST | passive | Bootstrap. Positive supply for the internal floating high-side MOSFET driver. Connect a bypass capacitor between this pin and SW. BST-to-SW absolute max is 6.0V. |
| 2 | GND | power_in | Ground return. Should be routed as close as possible to the output capacitor and kept away from high-current switching paths. |
| 3 | FB | input | Feedback input. Sets output voltage via an external resistor divider from VOUT to GND. Internal reference is 0.812V (typ). A frequency-foldback comparator lowers switching frequency (to ~150kHz) when FB < 250mV to prevent current-limit runaway during short-circuit. |
| 4 | EN | input | Enable input. Pull above VENR (1.35V typ) to enable; pull below VENF (1.17V typ) to disable. A 100kΩ pull-up to IN allows automatic turn-on. Absolute max 6.0V. |
| 5 | VIN | power_in | Input supply, 4.5V to 60V operating (absolute max 62V). Powers all internal control circuits. Requires a decoupling capacitor to ground placed close to this pin to reduce switching spikes. |
| 6 | SW | output | Switch output. Drain of the internal high-side MOSFET (RDS(on) ≈ 1Ω). Connect the external inductor and catch Schottky diode here. Voltage range -0.3V to VIN(MAX)+0.3V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Siproin Microelectronics |
| Package | SOT-23-6 |
| Category | 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 |
|---|---|---|---|---|---|---|---|
| Supply Voltage (absolute max) | VIN | -0.3 | 62 | V | 3 | ||
| BST to SW | -0.3 | 6 | V | 3 | |||
| All Other Pins | -0.3 | 6 | V | 3 | |||
| Storage Temperature | TSTG | -65 | 150 | ℃ | 3 | ||
| Operating Junction Temp | TJ | -40 | 125 | ℃ | 3 | ||
| Switch Voltage | VSW | -0.3 | V | 3 | |||
| Supply Voltage (recommended) | VIN | 4.5 | 60 | V | 3 | ||
| Operating Temperature | T | -40 | 85 | ℃ | 3 | ||
| Output Voltage | VOUT | 0.81 | V | 3 | |||
| Feedback Voltage | Vfb | 0.792 | 0.812 | 0.832 | V | 4 | |
| Limiting Current | Ilim | 1 | 1.25 | 1.5 | A | 4 | |
| Oscillator Frequency | Fosc | 380 | 480 | 580 | KHz | 4 | |
| Under-voltage on voltage | Vuvlo-r | 2.9 | 3.3 | 3.73 | V | 4 | |
| Under-voltage lockout | Vuvlo-f | 2.65 | 3.05 | 3.45 | V | 4 | |
| Quiescent Current | Iq | 0.73 | 0.86 | mA | Ven=2V, Vfb=1V | 4 | |
| Shutdown Current | Is | 0.1 | 1 | μA | Ven=0V | 4 | |
| Absolute max Junction Temperature | T | 150 | ℃ | 3 | |||
| Lead Temperature | T | 260 | ℃ | 3 | |||
| Continuous Power Dissipation | PD | 0.568 | W | TA=+25℃ | 3 | ||
| Junction-to-Ambient Thermal Resistance | θJA | 220 | ℃/W | 3 | |||
| Junction-to-Case Thermal Resistance | θJC | 110 | ℃/W | 3 | |||
| Upper Switch ON Resistance | Rsw | 1 | Ω | Vbst-Vsw=5V | 4 | ||
| Upper Switch Leakage | Iswleak | 1 | μA | Ven=0V, Vsw=0V | 4 | ||
| Turn-back frequency | Fsw-f | 150 | KHz | Vfb=0V | 4 | ||
| Minimum Switch ON Time | Ton min | 100 | ns | 4 | |||
| Enable on voltage | Venr | 1.35 | V | 4 | |||
| Enable off voltage | Venf | 1.17 | V | 4 | |||
| EN input current | Ien | 3.1 | μA | Ven=2V | 4 | ||
| EN input current | Ien | 0.1 | μA | Ven=0V | 4 | ||
| Thermal Shutdown | Tsd | 165 | ℃ | 4 |
CAD (KiCad official)
- Symbol:
SSP9459 - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
ssp9459-etched.step/ssp9459-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ssp9459.step/ssp9459.glbare the bare package body.
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
ssp9459.step |
97 KB | You want the bare part, or you mark your own boards. |
ssp9459-etched.step |
1.9 MB | You want the part with SSP9459 already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 437 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shanghai Siproin Microelectronics datasheet (8 pp, sha256
40202436a30fcb96, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).