Part Information Review and Updates

Thought for 3 mins 28 sec

Review complete

I added the official TI datasheet URL to the project:

Datasheet URL = https://www.ti.com/lit/ds/symlink/bq24074.pdf

I checked the part project against the datasheet using the datasheet as the source of truth and counted the exposed pad as part of the package review, which is the correct validation approach for part projects

Key part information Project vs datasheet

Table

Field	Current project	Datasheet check	Status
MPN	BQ24074RGTR	Matches TI orderable part	OK
Manufacturer	Texas Instruments	Matches datasheet	OK
Description	`Charger IC Lithium Ion 16-VQFN (3x3)`	Functionally correct, but could be more specific	OK
Part type	`Integrated Circuit`	Correct, more specifically a 1-cell linear charger with power path	OK
Designator prefix	`U`	Correct for IC	OK
Datasheet URL	Missing before review	Official TI PDF found and added	Fixed
Package text	`16-VQFN (3x3)` in description	Datasheet shows VQFN (RGT), 16 pins, 3.0 mm x 3.0 mm, exposed thermal pad	Mostly OK

Key specs from the datasheet BQ24074RGTR summary

Table

Spec	Value
Function	1-cell Li-Ion linear charger with dynamic power-path management
Charge current	Up to 1.5 A
Battery regulation voltage	4.2 V
OUT regulation	4.4 V nominal
Operating input range for BQ24074	4.35 V to 10.2 V
Input abs survival	Up to 26 V without damage, operation suspended
USB modes	100 mA, 500 mA, or resistor-programmed input current limit
ILIM programmable range	Up to 1.5 A
Temperature	Junction operating range -40 C to 125 C
Thermal regulation	125 C
Thermal shutdown	155 C
Package	16-pin VQFN (RGT) with exposed thermal pad

Symbol and pin cross-check Pin-count check

Datasheet package: 16 named pins + exposed thermal pad
Current project terminals: 17
Current footprint electrical pads visible: 17

That matches the expected electrical pin count from the datasheet. The skill guidance also explicitly requires exposed pads to be counted in the pin audit

Pin name / function review

Table

Datasheet pin	Project terminal	Review
TS	TS	OK
BAT	BAT_2	Electrically plausible, but naming differs from datasheet
BAT	BAT_3	Electrically plausible, but naming differs from datasheet
CE	~CE	Active-low semantics shown in symbol, but name differs from datasheet
EN2	EN2	OK
EN1	EN1	OK
PGOOD	~PGOOD	Active-low semantics shown, but datasheet names it PGOOD
VSS	VSS	Name OK
CHG	~CHG	Active-low semantics shown, but datasheet names it CHG
OUT	OUT_10	Electrically plausible, but naming differs from datasheet
OUT	OUT_11	Electrically plausible, but naming differs from datasheet
ILIM	ILIM	OK
IN	IN	OK
TMR	TMR	OK
ITERM	ITERM	OK
ISET	ISET	OK
Exposed thermal pad	EXP	Present, good

Pin-type mismatches and issues Flagged items

Table

Terminal	Current pin type	Datasheet meaning	Flag
VSS	`Power In`	Ground	Mismatch
EXP	`Power In`	Exposed thermal pad tied to VSS / ground	Mismatch
IN	`Input`	Power input	Likely should be Power In
OUT_10	`Output`	System supply output	Likely should be Power Out
OUT_11	`Output`	System supply output	Likely should be Power Out

Probably acceptable

Table

Terminal	Current pin type	Notes
~CE	`Input`	Correct direction
EN1	`Input`	Correct
EN2	`Input`	Correct
ILIM	`Input`	Correct
TMR	`Input`	Correct
ITERM	`Input`	Correct
ISET	`Bi-Directional`	Reasonable, since it programs charge current and monitors current
~PGOOD	`Output`	Correct as status output
~CHG	`Output`	Correct as status output
BAT_2	`Bi-Directional`	Reasonable for battery connection/sense
BAT_3	`Bi-Directional`	Reasonable for battery connection/sense
TS	`Input`	Correct

Pin description audit

I did not find any visible Pin Description properties on the terminal components.

That means the symbol is currently missing short per-pin descriptions, which the part-project sync guidance recommends populating for clarity and ERC quality

Footprint cross-check What looks correct

Table

Item	Review
Package family	Asset name `QFN50P300X300X100-17N.kicad_mod` is consistent with 0.50 mm pitch, 3.0 mm x 3.0 mm, 1.0 mm height, 17 electrical pads
Electrical pad count	Layout shows 17 named electrical pads, matching 16 leads + exposed pad
Exposed pad presence	EXP exists, consistent with datasheet thermal pad requirement
Thermal-pad requirement	Datasheet says exposed pad is internally connected to VSS and must be tied to the same potential as VSS

Possible concern

The layout metadata also shows 5 additional mount-pad entries numbered 18 to 22. These do not appear to correspond to datasheet electrical pins.
They may be footprint-internal mechanical/helper objects rather than real package pins, but based on the available layout data I can only flag them for review.

Main mismatches to fix Recommended corrections

Table

Priority	Issue
High	Change VSS pin type from `Power In` to `Ground`
High	Change EXP pin type from `Power In` to `Ground`
Medium	Change IN from `Input` to `Power In`
Medium	Change OUT_10 and OUT_11 from `Output` to `Power Out`
Medium	Add `Pin Description` properties to all terminals
Low	Normalize symbol labels if you want exact datasheet naming, for example ~CE, ~PGOOD, ~CHG, BAT_2, BAT_3, OUT_10, OUT_11

If you want, I can make those symbol-property fixes next.

Fix all mismatches

Check decoupling issues

Document part audit

Thought for 1 sec

flux

Set Datasheet URL to "https://www.ti.com/lit/ds/symlink/bq24074.pdf"

~CE

Pin Number

~PGOOD

Pin Number

BAT_2

Pin Number

EXP

Pin Number

~CHG

Pin Number

EN2

Pin Number

OUT_10

Pin Number

ILIM

Pin Number

BAT_3

Pin Number

ITERM

Pin Number

EN1

Pin Number

TMR

Pin Number

ISET

Pin Number

OUT_11

Pin Number

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