Part Metadata Review and Update
Thought for 5 sec
I’ll inspect the part metadata, look up the official datasheet if needed, update the Datasheet property, then compare pins/symbol/footprint against the datasheet and report any mismatches.
Worked for 3 mins 55 sec
Reviewed the LM74720QDRRRQ1 part against the TI datasheet and created a detailed report: LM74720QDRRRQ1 Part Review (
lm74720qdrrrq1-part-review).Open items flagged:
- Package property says
TO, but datasheet package is WSON-12 / DRR. - Pin numbers match, but all pin types are currently
Unspecified. - Exposed pad is modeled as
EPpin 13, while datasheet calls it RTN thermal pad and says leave floating. - Datasheet URL already existed, so I did not overwrite it; official TI URL is
https://www.ti.com/lit/ds/symlink/lm74720-q1.pdf.
Suggested next steps:
- Update package/property metadata to WSON-12 / DRR.
- Add datasheet pin descriptions and pin types.
- Decide whether to replace the existing uploaded datasheet URL with the official TI URL.
- Verify exact footprint pad geometry against TI DRR0012F land pattern.
Fix metadata and pins
Fix flagged issues
Use official datasheet
Verify footprint geometry
Run ERC DRC
Refine this doc
Ask about this doc
LM74720QDRRRQ1 Part Review
Reviewed project data
- Project/part: LM74720QDRRRQ1
- Manufacturer: Texas Instruments
- Current MPN property: LM74720QDRRRQ1
- Current Part Type property: Diodes
- Current Package or Case Code property: TO
- Current Datasheet URL property:
https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/89e215be1244d410dcac54373ffd66cc256a507b816ea06c81d1f57d353f2c0a.pdf - Official TI datasheet found:
https://www.ti.com/lit/ds/symlink/lm74720-q1.pdf - Project description: Automotive low-IQ ideal diode controller with active rectification and load dump protection, 12-WSON, -40°C to 125°C.
Datasheet key facts
Source: Texas Instruments LM74720-Q1 datasheet, Rev. B.
- Function: Low-IQ automotive ideal diode controller with active rectification and load dump/overvoltage protection.
- Qualification: AEC-Q100, Grade 1 ambient operating temperature range -40°C to +125°C.
- Input operating range: 3 V to 65 V.
- Reverse input protection: down to -65 V.
- Recommended A-to-GND range: -60 V to +65 V.
- Quiescent current: 35 µA max in operation; shutdown current 3.3 µA max with EN low.
- Ideal diode regulation: 17 mV A-to-C forward voltage regulation.
- Gate drive: drives external back-to-back N-channel MOSFETs; GATE-A drive 9.5 V to 13 V.
- Integrated boost regulator: 29 mA typical/load capacity; recommended LX inductor 100 µH; recommended CAP-to-VS capacitance 1 µF.
- Reverse current blocking response: about 0.5 µs.
- Active rectification: up to 100 kHz.
- OV threshold: 1.231 V typical rising, 1.125 V typical falling.
- Package: WSON (DRR), 12 pins, nominal body 3.0 mm × 3.0 mm, 0.5 mm pitch, 0.8 mm max height.
- Orderable: LM74720QDRRRQ1, active production, large tape/reel 3000 qty, marking L74720, MSL-2 260°C.
Datasheet pin table versus schematic terminals
Table
| Datasheet pin | Name | Type | Datasheet function | Schematic terminal present? | Notes |
|---|---|---|---|---|---|
| 1 | GATE | O | Ideal-diode MOSFET gate-drive output | Yes | Pin number matches. Pin Type property is Unspecified, should be Output. |
| 2 | A | I | Ideal diode anode / external MOSFET source | Yes | Pin number matches. Pin Type property is Unspecified, should be Input. |
| 3 | VSNS | I | Voltage sensing input | Yes | Pin number matches. Pin Type property is Unspecified, should be Input. |
| 4 | SW | I | Battery/OV ladder disconnect switch terminal | Yes | Pin number matches. Pin Type property is Unspecified, should be Input. |
| 5 | OV | I | Adjustable overvoltage threshold input | Yes | Pin number matches. Pin Type property is Unspecified, should be Input. |
| 6 | EN | I | Enable input | Yes | Pin number matches. Pin Type property is Unspecified, should be Input. |
| 7 | GND | G | System ground | Yes | Pin number matches. Pin Type property is Unspecified, should be Ground/Power. |
| 8 | PD | O | External load-disconnect FET pulldown/gate control | Yes | Pin number matches. Pin Type property is Unspecified, should be Output. |
| 9 | LX | I | Internal boost regulator switch node | Yes | Pin number matches. Pin Type property is Unspecified, datasheet classifies as Input. |
| 10 | CAP | O | Boost regulator output/gate-driver supply | Yes | Pin number matches. Pin Type property is Unspecified, should be Output/Power. |
| 11 | VS | I | Supply voltage pin | Yes | Pin number matches. Pin Type property is Unspecified, should be Input/Power. |
| 12 | C | I | Ideal diode cathode / external MOSFET drain | Yes | Pin number matches. Pin Type property is Unspecified, should be Input. |
| Thermal pad | RTN | — | Exposed pad; leave floating, do not connect to GND plane | Represented as EP pin 13 | Naming/numbering mismatch: datasheet names pad RTN and does not assign numeric pin 13. Current symbol/footprint names it EP with Pin Number 13. |
Footprint/package cross-check
Expected package from datasheet:
- TI package drawing: DRR0012F / WSON-12.
- Body: 2.9 mm to 3.1 mm square, nominal 3.0 mm × 3.0 mm.
- Pitch: 0.5 mm.
- 12 perimeter terminals plus exposed thermal pad.
- Terminal dimensions: 0.32 mm to 0.52 mm length; 0.20 mm to 0.30 mm width.
- Exposed pad: about 2.4 mm to 2.6 mm by 0.96 mm to 1.16 mm.
- Example board land pattern: 12 lands approximately 0.25 mm × 0.62 mm, 0.5 mm pitch; exposed pad land pattern around 2.5 mm by 1.06 mm.
Observed footprint data:
- Footprint contains pads named GATE, A, VSNS, SW, OV, EN, GND, PD, LX, CAP, VS, C, and EP: 12 functional pads plus exposed pad.
- Silkscreen/fab outline appears approximately 3 mm × 3 mm with pin-1 marker, consistent with DRR WSON nominal body.
- The layout tree did not expose enough pad geometry detail in the inspection output to fully verify land sizes and exact pad coordinates against TI’s land pattern.
Mismatches / issues flagged
- Package property mismatch: Current
Package or Case CodeisTO, but the datasheet/orderable part is WSON (DRR), 12 pins, TI package drawing DRR0012F. - Part Type is broad/misleading: Current
Part TypeisDiodes; a better classification is an ideal-diode / power-management controller or PMIC, not a discrete diode. - Datasheet URL is not the official TI URL: A datasheet is already set, so per request I did not overwrite it automatically. The official TI URL is
https://www.ti.com/lit/ds/symlink/lm74720-q1.pdf. - Pin Type properties are all Unspecified: The datasheet defines GATE/CAP/PD as outputs, A/VSNS/SW/OV/EN/LX/VS/C as inputs, and GND as ground. These should be updated for better ERC behavior and library quality.
- Exposed pad naming/numbering mismatch: Datasheet calls the exposed pad RTN and explicitly says to leave it floating / do not connect to GND. Current symbol/footprint uses EP with Pin Number 13. If Flux requires a numbered pad for layout, this can be acceptable mechanically, but the pin description should clearly say
RTN exposed pad — leave floating, do not connect to GND. - Footprint geometry not fully verified: Pad count and nominal outline look correct for WSON-12 DRR, but exact land dimensions were not visible in the layout inspection output; exact pad size/coordinate verification remains incomplete.
Recommended cleanup
- Change
Package or Case CodefromTOtoWSON-12 (DRR)orDRR0012F. - Optionally change
Datasheet URLto the official TI symlink URL. - Add pin descriptions and pin types from the datasheet table.
- Rename EP to RTN if the library convention allows non-numbered exposed pads; otherwise keep EP/13 but document it as RTN exposed pad and leave floating.
- If exact footprint verification is required, inspect/edit pad geometry directly against TI DRR0012F land pattern values.
Reviewed project data
Datasheet key facts
Datasheet pin table versus schematic terminals
Footprint/package cross-check
Mismatches / issues flagged
Recommended cleanup
