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TPS65251-1RHAR
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Texas Instruments DC-DC Converters, VQFN-40-EP(6x6). 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
markdownTPS65251-1RHAR
Texas Instruments · DC-DC Converters · VQFN-40-EP(6x6)
TPS65251-1RHAR from Texas Instruments, in a VQFN-40-EP(6x6). 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 | RLIM3 | input | Current-limit setting for Buck 3; a resistor from this pin to ground sets the peak current limit on the output inductor. |
| 2 | SS3 | input | Soft-start pin for Buck 3; a small ceramic capacitor on this pin sets the converter soft-start time. |
| 3 | COMP3 | output | Buck 3 compensation pin; a series RC circuit on this pin completes the converter compensation network. |
| 4 | FB3 | input | Buck 3 feedback input; connect a divider set to 0.8 V from the converter output to ground. |
| 5 | SYNC | input | Synchronous clock input for the oscillator; connect to GND when not used. |
| 6 | ROSC | input | Oscillator set pin; the resistor sets the internal clock frequency, and if external synchronization is used it should be set to about 70% of the external clock frequency. |
| 7 | FB1 | input | Buck 1 feedback pin; connect a divider set to 0.8 V from the converter output to ground. |
| 8 | COMP1 | output | Buck 1 compensation pin; a series RC circuit on this pin completes the converter compensation network. |
| 9 | SS1 | input | Soft-start pin for Buck 1; a small ceramic capacitor on this pin sets the converter soft-start time. |
| 10 | RLIM1 | input | Current-limit setting pin for Buck 1; a resistor from this pin to ground sets the peak current limit on the output inductor. |
| 11 | EN1 | input | Enable pin for Buck 1; a low level disables the converter, an open pin is pulled up weakly to V3V for automatic enable, and a small ceramic capacitor to ground adds a delayed start-up. |
| 12 | BST1 | input | Bootstrap pin 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. |
| 14 | LX1 | output | Switching node for Buck 1. |
| 15 | LX1 | output | Switching node for Buck 1. |
| 16 | LX2 | output | Switching node for Buck 2. |
| 17 | LX2 | output | Switching node for Buck 2. |
| 18 | VIN2 | power_in | Input supply for Buck 2; fit a 10-µF ceramic capacitor close to this pin. |
| 19 | BST2 | input | Bootstrap pin 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 disables the converter, an open pin is pulled up weakly to V3V for automatic enable, and a small ceramic capacitor to ground adds a delayed start-up. |
| 21 | RLIM2 | input | Current-limit setting for Buck 2; a resistor from this pin to ground sets the peak current limit on the output inductor. |
| 22 | SS2 | input | Soft-start pin for Buck 2; a small ceramic capacitor on this pin sets the converter soft-start time. |
| 23 | COMP2 | output | Buck 2 compensation pin; a series RC circuit on this pin completes the converter compensation network. |
| 24 | FB2 | input | Buck 2 feedback input; connect a divider set to 0.8 V from the converter output to ground. |
| 25 | LOW_P | input | Active-high low-power operation mode input for the TPS65251. |
| 26 | GND | power_in | Ground pin. |
| 27 | PGOOD | output | Power-good open-drain output, asserted after all converters are sequenced and within regulation; active-high by default, with polarity factory-selectable. |
| 28 | V7V | power_out | Internal supply; connect a 10-µF ceramic capacitor from this pin to ground. |
| 29 | V3V | power_out | Internal supply; connect a 3.3- 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. |
| 32 | VIN | power_in | Input supply pin (one of three VIN pins that share the input supply). |
| 33 | VIN | power_in | Input supply pin (one of three VIN pins that share the input supply). |
| 34 | VIN | power_in | Input supply pin (one of three VIN pins that share the input supply). |
| 35 | GND | power_in | Ground pin. |
| 36 | LX3 | output | Switching node for Buck 3. |
| 37 | LX3 | output | Switching node for Buck 3. |
| 38 | VIN3 | power_in | Input supply for Buck 3; fit a 10-µF ceramic capacitor close to this pin. |
| 39 | BST3 | input | Bootstrap pin 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 disables the converter, an open pin is pulled up weakly to V3V for automatic enable, and a small ceramic capacitor to ground adds a delayed start-up. |
| 41 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-40-EP(6x6) |
| Category | Power Management (PMIC) |
| Pins | 41 |
CAD (KiCad official)
- Symbol:
TPS65251-1RHAR - Footprint:
Package_DFN_QFN:QFN-40-1EP_6x6mm_P0.5mm_EP4.6x4.6mm - 3D model: VQFN-40-EP(6x6) (KiCad packages3D, STEP)
- 3D model files:
tps65251-1rhar-etched.step/tps65251-1rhar-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tps65251-1rhar.step/tps65251-1rhar.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (47 pp, sha256
ccc6de3dc205a000, retrieved 2026-10-08, 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-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).