component
TPS65251RHAR
Public Unreviewedby Ray
Texas Instruments DC-DC Converters, VQFN-40-EP(6x6). Datasheet-verified pinout, 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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Contents
README
markdownTPS65251RHAR
Texas Instruments · DC-DC Converters · VQFN-40-EP(6x6)
TPS65251RHAR from Texas Instruments, in a VQFN-40-EP(6x6). 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 | RLIM3 | input | Current limit setting for Buck 3. Fit a resistor from this pin to ground to set the peak current limit on the output inductor. |
| 2 | SS3 | passive | Soft-start pin for Buck 3. Fit a small ceramic capacitor to this pin to set the converter soft-start time. |
| 3 | COMP3 | output | Compensation for Buck 3. Fit a series RC circuit to this pin to complete the compensation circuit of this converter. |
| 4 | FB3 | input | Feedback input for Buck 3. Connect a divider set to 0.8 V from the output of the converter to ground. |
| 5 | SYNC | input | Synchronous clock input. If there is a sync clock in the system, connect to the pin. When not used connect to GND. |
| 6 | ROSC | input | Oscillator set. This resistor sets the frequency of internal autonomous clock. If external synchronization is used resistor should be fitted and set to about 70% of external clock frequency. |
| 7 | FB1 | input | Feedback pin for Buck 1. Connect a divider set to 0.8 V from the output of the converter to ground. |
| 8 | COMP1 | output | Compensation pin for Buck 1. Fit a series RC circuit to this pin to complete the compensation circuit of this converter. |
| 9 | SS1 | passive | Soft-start pin for Buck 1. Fit a small ceramic capacitor to this pin to set the converter soft-start time. |
| 10 | RLIM1 | input | Current limit setting pin for Buck 1. Fit a resistor from this pin to ground to set the peak current limit on the output inductor. |
| 11 | EN1 | input | Enable pin for Buck 1. A low level signal on this pin disables it. If pin is left open a weak internal pullup to V3V will allow for automatic enable. For a delayed start-up add a small ceramic capacitor to this pin to ground. |
| 12 | BST1 | passive | Bootstrap capacitor for Buck 1. Fit a 47-nF ceramic capacitor from this pin to the switching node. |
| 13 | VIN1 | power_in | Input supply for Buck 1. Fit a 10-µF ceramic capacitor close to this pin. 4.5 V to 18 V operating range. |
| 14 | LX1 | output | Switching node for Buck 1. Connect to the output inductor. Pins 14 and 15 are internally tied. |
| 15 | LX1 | output | Switching node for Buck 1. Connect to the output inductor. Pins 14 and 15 are internally tied. |
| 16 | LX2 | output | Switching node for Buck 2. Connect to the output inductor. Pins 16 and 17 are internally tied. |
| 17 | LX2 | output | Switching node for Buck 2. Connect to the output inductor. Pins 16 and 17 are internally tied. |
| 18 | VIN2 | power_in | Input supply for Buck 2. Fit a 10-µF ceramic capacitor close to this pin. 4.5 V to 18 V operating range. |
| 19 | BST2 | passive | Bootstrap capacitor for Buck 2. Fit a 47-nF ceramic capacitor from this pin to the switching node. |
| 20 | EN2 | input | Enable pin for Buck 2. A low level signal on this pin disables it. If pin is left open a weak internal pullup to V3V will allow for automatic enable. For a delayed start-up add a small ceramic capacitor to this pin to ground. |
| 21 | RLIM2 | input | Current limit setting pin for Buck 2. Fit a resistor from this pin to ground to set the peak current limit on the output inductor. |
| 22 | SS2 | passive | Soft-start pin for Buck 2. Fit a small ceramic capacitor to this pin to set the converter soft-start time. |
| 23 | COMP2 | output | Compensation pin for Buck 2. Fit a series RC circuit to this pin to complete the compensation circuit of this converter. |
| 24 | FB2 | input | Feedback input for Buck 2. Connect a divider set to 0.8 V from the output of the converter to ground. |
| 25 | LOW_P | input | Low-power operation mode (active high) input for TPS65251. Tie to V3V to enable pulse-skipping mode (PSM) for improved light-load efficiency. |
| 26 | GND | power_in | Ground pin. Connect all GND pins and the power pad together. |
| 27 | PGOOD | output | Powergood. Open-drain output asserted after all converters are sequenced and within regulation. Polarity is factory selectable (active high default). |
| 28 | V7V | power_out | Internal supply. Connect a 10-µF ceramic capacitor from this pin to ground. |
| 29 | V3V | power_out | Internal 3.3-V supply. Connect a 3.3-µF to 10-µF ceramic capacitor from this pin to ground. |
| 30 | AGND | power_in | Analog ground. Connect all GND pins and the power pad together. |
| 31 | GND | power_in | Ground pin. Connect all GND pins and the power pad together. |
| 32 | VIN | power_in | Input supply. 4.5 V to 18 V operating range. |
| 33 | VIN | power_in | Input supply. 4.5 V to 18 V operating range. |
| 34 | VIN | power_in | Input supply. 4.5 V to 18 V operating range. |
| 35 | GND | power_in | Ground pin. Connect all GND pins and the power pad together. |
| 36 | LX3 | output | Switching node for Buck 3. Connect to the output inductor. Pins 36 and 37 are internally tied. |
| 37 | LX3 | output | Switching node for Buck 3. Connect to the output inductor. Pins 36 and 37 are internally tied. |
| 38 | VIN3 | power_in | Input supply for Buck 3. Fit a 10-µF ceramic capacitor close to this pin. 4.5 V to 18 V operating range. |
| 39 | BST3 | passive | Bootstrap capacitor for Buck 3. Fit a 47-nF ceramic capacitor from this pin to the switching node. |
| 40 | EN3 | input | Enable pin for Buck 3. A low level signal on this pin disables it. If pin is left open a weak internal pullup to V3V will allow for automatic enable. For a delayed start-up add a small ceramic capacitor to this pin to ground. |
| PAD | PAD | power_in | Exposed thermal power pad. Connect to ground. Provides the primary thermal path for the package. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-40-EP(6x6) |
| Category | PMIC |
| Pins | 41 |
Ordering variants
Same part, different packaging or reel option.
TPS65251RHARTPS65251RHARRHAT
CAD (KiCad official)
- Symbol:
TPS65251RHAR - Footprint:
Package_DFN_QFN:QFN-40-1EP_6x6mm_P0.5mm_EP4.6x4.6mm - 3D model: VQFN-40-EP(6x6) (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
tps65251rhar.step |
538 KB | You want the bare part, or you mark your own boards. |
tps65251rhar-etched.step |
3.1 MB | You want the part with TPS65251RHAR already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 799 faces against 314 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: Texas Instruments datasheet (35 pp, sha256
da1006fcecc18a3f, retrieved 2026-08-17, tier: manufacturer) - 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).