component
TPS51397ARJER
Public Made by Adomby adom
Texas Instruments DC-DC Converters, QFN-20-EP(3x3). 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
markdownTPS51397ARJER
Texas Instruments · DC-DC Converters · QFN-20-EP(3x3)
TPS51397ARJER from Texas Instruments, in a QFN-20-EP(3x3). 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 | BST | power_out | Supply input for the gate drive voltage of the high-side MOSFET; connect a bootstrap capacitor between BST and SW, 0.1 μF recommended (VBST abs max 31 V). |
| 2 | VIN | power_in | Input voltage supply pin for the control circuitry (4.5 V to 24 V recommended); connect input decoupling capacitors between VIN and PGND. |
| 3 | VIN | power_in | Input voltage supply pin for the control circuitry (4.5 V to 24 V recommended); connect input decoupling capacitors between VIN and PGND. |
| 4 | VIN | power_in | Input voltage supply pin for the control circuitry (4.5 V to 24 V recommended); connect input decoupling capacitors between VIN and PGND. |
| 5 | VIN | power_in | Input voltage supply pin for the control circuitry (4.5 V to 24 V recommended); connect input decoupling capacitors between VIN and PGND. |
| 6 | SW | power_out | Switching node connection to the inductor and bootstrap capacitor; voltage swings from a diode voltage below ground up to the input voltage. |
| 7 | PGND | power_in | Power ground terminal for the controller circuit and the internal circuitry. |
| 8 | PGND | power_in | Power ground terminal for the controller circuit and the internal circuitry. |
| 9 | PGOOD | output | Open-drain power-good indicator, asserted low if output voltage is out of PG threshold, over voltage, or during thermal shutdown, EN shutdown, or soft start. |
| 10 | NC | unconnected | Not connected internally; can be connected to the GND plane for better thermal performance. |
| 11 | SS | output | Soft-start time selection pin; an external capacitor sets the soft-start time, and with no capacitor it is about 1.2 ms. |
| 12 | EN | input | Enable input of the buck converter. |
| 13 | AGND | power_in | Ground of internal analog circuitry; connect to the GND plane with a short trace. |
| 14 | FB | input | Feedback sensing pin for the buck output voltage; connect to the resistor divider between output voltage and AGND (0.6 V reference). |
| 15 | MODE | input | Switching frequency and light load operation mode selection pin; connect to a resistor divider from VCC and AGND. |
| 16 | NC | unconnected | Not connected internally; can be connected to the GND plane for better thermal performance. |
| 17 | VCC | power_out | Powers the driver and control circuits; decouple with a minimum 1-μF ceramic capacitor as close to VCC as possible. |
| 18 | PGND | power_in | Power ground terminal for the controller circuit and the internal circuitry. |
| 19 | SW | power_out | Switching node connection to the inductor and bootstrap capacitor; voltage swings from a diode voltage below ground up to the input voltage. |
| 20 | SW | power_out | Switching node connection to the inductor and bootstrap capacitor; voltage swings from a diode voltage below ground up to the input voltage. |
| 21 | PGND | power_in | Thermal pad, power ground terminal for the controller circuit and the internal circuitry. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | QFN-20-EP(3x3) |
| Category | Power Management (PMIC) |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
TPS51397ARJER - Footprint:
Package_DFN_QFN:UQFN-20-1EP_3x3mm_P0.4mm_EP1.85x1.85mm - 3D model: QFN-20-EP(3x3) (KiCad packages3D, STEP)
- 3D model files:
tps51397arjer-etched.step/tps51397arjer-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tps51397arjer.step/tps51397arjer.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (28 pp, sha256
ace9eacb12e2228b, retrieved 2026-10-03, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(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).