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TPS65257RHAR
Public Made by Adomby adom
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
markdownTPS65257RHAR
Texas Instruments · DC-DC Converters · VQFN-40-EP(6x6)
TPS65257RHAR 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 Buck3; a resistor from this pin to ground sets the peak current limit on the output inductor. |
| 2 | SS3 | input | Soft start pin for Buck3; a small ceramic capacitor on this pin sets the converter soft start time. |
| 3 | COMP3 | output | Compensation for Buck3; a series RC circuit on this pin completes the converter compensation. |
| 4 | FB3 | input | Feedback pin for Buck3; connect a divider set to 0.8 V from the converter output to ground. |
| 5 | PB_IN | input | Push button input (active low); rated 10 kV HBM ESD. |
| 6 | ROSC | input | Oscillator set; an external resistor (50 kΩ to 600 kΩ) sets the frequency of the internal clock (0.3 to 2.2 MHz). |
| 7 | FB1 | input | Feedback pin for Buck1; connect a divider set to 0.8 V from the converter output to ground. |
| 8 | COMP1 | output | Compensation pin for Buck1; a series RC circuit on this pin completes the converter compensation. |
| 9 | SS1 | input | Soft-start pin for Buck1; a small ceramic capacitor on this pin sets the converter soft-start time. |
| 10 | RLIM1 | input | Current limit setting pin for Buck1; a resistor from this pin to ground sets the peak current limit on the output inductor. |
| 11 | EN1 | input | Enable pin for Buck1; a high signal enables the regulator, and a small capacitor to ground delays start-up. |
| 12 | BST1 | passive | Bootstrap capacitor for Buck1; fit a 47-nF ceramic capacitor from this pin to the switching node. |
| 13 | VIN1 | power_in | Input supply for Buck1 (4.5 V to 16 V); fit a 10-µF ceramic capacitor close to this pin. |
| 14 | LX1 | output | Switching node for Buck1 (pins 14 and 15 are the same net). |
| 15 | LX1 | output | Switching node for Buck1 (pins 14 and 15 are the same net). |
| 16 | LX2 | output | Switching node for Buck2 (pins 16 and 17 are the same net). |
| 17 | LX2 | output | Switching node for Buck2 (pins 16 and 17 are the same net). |
| 18 | VIN2 | power_in | Input supply for Buck2 (4.5 V to 16 V); fit a 10-µF ceramic capacitor close to this pin. |
| 19 | BST2 | passive | Bootstrap capacitor for Buck2; fit a 47-nF ceramic capacitor from this pin to the switching node. |
| 20 | EN2 | input | Enable pin for Buck2; a high signal enables the regulator, and a small capacitor to ground delays start-up. |
| 21 | RLIM2 | input | Current limit setting pin for Buck2; a resistor from this pin to ground sets the peak current limit on the output inductor. |
| 22 | SS2 | input | Soft-start pin for Buck2; a small ceramic capacitor on this pin sets the converter soft-start time. |
| 23 | COMP2 | output | Compensation pin for Buck2; a series RC circuit on this pin completes the converter compensation. |
| 24 | FB2 | input | Feedback input for Buck2; connect a divider set to 0.8 V from the converter output to ground. |
| 25 | F_PWM | input | Forces PWM operation in all converters when high; when low the converters operate in automatic PFM/PWM mode. |
| 26 | INT | output | Open drain interrupt output. |
| 27 | PGOOD | output | Open drain power-good output, asserted after all converters are sequenced and within regulation; polarity is factory selectable (active high default). |
| 28 | V7V | power_out | Internal 6.25 V supply; connect a 4.7-µF to 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 | GND | power_in | Ground. |
| 31 | IC | input | This pin should be connected to the V7V pin. |
| 32 | USB_VIN | power_in | USB switch input supply (absolute maximum -0.3 to 7 V). |
| 33 | USB_Vo | power_out | USB switch output, supplying up to 1 A to downstream USB devices. |
| 34 | USB_EN | input | USB switch enable input; high turns on the switch. |
| 35 | USB_nFAULT | output | USB fault flag output, open drain, active low; asserted when overcurrent or overtemperature is detected in the switch. |
| 36 | LX3 | output | Switching node for Buck3 (pins 36 and 37 are the same net). |
| 37 | LX3 | output | Switching node for Buck3 (pins 36 and 37 are the same net). |
| 38 | VIN3 | power_in | Input supply for Buck3 (4.5 V to 16 V); fit a 10-µF ceramic capacitor close to this pin. |
| 39 | BST3 | passive | Bootstrap capacitor for Buck3; fit a 47-nF ceramic capacitor from this pin to the switching node. |
| 40 | EN3 | input | Enable pin for Buck3; a high signal enables the converter, and a small capacitor to ground delays start-up. |
| 41 | PowerPAD | power_in | PowerPAD; connect to system ground for electrical and thermal connection. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-40-EP(6x6) |
| Category | Power Management (PMIC) |
| Pins | 41 |
CAD (KiCad official)
- Symbol:
TPS65257RHAR - 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:
tps65257rhar-etched.step/tps65257rhar-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tps65257rhar.step/tps65257rhar.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (43 pp, sha256
878873c6c0906983, retrieved 2026-10-11, 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).