Part Information Audit and Review
Worked for 1 min 30 sec
Fixed the BQ24074RGTT terminal metadata from the TI datasheet.
Updated all 17 terminals with datasheet-derived Pin Type and Pin Description, including standard pin types for IN, OUT, BAT, VSS, EP, open-drain status outputs, and programming/control pins. Verification passed, and the terminal-related part review checks returned no reported issues.
Please also convert the symbol to parametric style,and place each pin into the correct section based on the datasheet.
Thought for 10 sec
I’ll switch the symbol metadata to parametric style, assign each terminal to datasheet-based functional sections, and verify the resulting symbol properties.
Worked for 2 mins
Updated the symbol metadata to Parametric style.
I assigned each pin to a datasheet-based section and orientation: power-path pins to Power, VSS/EP to Ground, TS to Analog, and control/programming/status pins to Control. I also set terminal order by datasheet pin number and verified the updates; terminal/parametric review checks returned no reported issues.
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BQ24074RGTT Part Review
Source
- Official datasheet: https://www.ti.com/lit/ds/symlink/bq24074.pdf
- Manufacturer: Texas Instruments
- MPN: BQ24074RGTT
- Function: Standalone 1-cell Li-Ion/Li-Polymer 1.5 A linear battery charger with power-path management.
Project Metadata Reviewed / Updated
The project was updated with the official TI datasheet URL and key metadata:
- Manufacturer Name: Texas Instruments
- Manufacturer Part Number: BQ24074RGTT
- Datasheet URL: https://www.ti.com/lit/ds/symlink/bq24074.pdf
- Package: VQFN-16 RGT, 3 mm x 3 mm, exposed thermal pad
- Operating temperature: -40 C to 85 C orderable-device range
Key Datasheet Specs
Table
| Parameter | Datasheet value |
|---|---|
| Cell chemistry | 1-cell Li-Ion / Li-Polymer |
| Battery regulation voltage | 4.2 V |
| OUT regulation, BQ24074 | 4.4 V typ |
| Input operating range, BQ24074 | 4.35 V to 10.2 V |
| Recommended IN voltage range / withstand | 4.35 V to 26 V recommended range; abs max 28 V |
| Input OVP threshold, BQ24074 | 10.5 V typ |
| IN current limit | 100 mA, 500 mA, or resistor-programmed 200 mA to 1.5 A |
| Fast-charge current | Programmable up to 1.5 A |
| OUT current | 4.5 A recommended operating, 5 A abs max continuous |
| BAT discharge current | 4.5 A recommended operating, 5 A abs max |
| Package | RGT VQFN-16 with exposed thermal pad |
| Orderable package quantity | RGTT = 250 units/reel |
| Device marking | BZF or NXK |
| MSL / finish | Level-2-260C-1YEAR, NiPdAu, RoHS/Green |
Datasheet Pinout vs Project Symbol
Table
| Pin | Datasheet name | Function summary | Project symbol name | Match |
|---|---|---|---|---|
| 1 | TS | NTC thermistor input; use 10 k fixed resistor to VSS if unused | TS | Yes |
| 2 | BAT | Battery output/sense; bypass to VSS with 4.7 uF to 47 uF | BAT | Yes |
| 3 | BAT | Battery output/sense; bypass to VSS with 4.7 uF to 47 uF | BAT | Yes |
| 4 | CE | Active-low charge enable; internal pulldown, do not leave floating | ~CE | Yes |
| 5 | EN2 | Input current limit select; internal pulldown, do not leave floating | EN2 | Yes |
| 6 | EN1 | Input current limit select; internal pulldown, do not leave floating | EN1 | Yes |
| 7 | PGOOD | Open-drain power-good output | ~PGOOD | Yes |
| 8 | VSS | Ground; connect to thermal pad and ground rail | VSS | Yes |
| 9 | CHG | Open-drain charging status output | ~CHG | Yes |
| 10 | OUT | System supply output; bypass to VSS with 4.7 uF to 47 uF | OUT | Yes |
| 11 | OUT | System supply output; bypass to VSS with 4.7 uF to 47 uF | OUT | Yes |
| 12 | ILIM | Input current programming resistor 1.1 k to 8 k to VSS | ILIM | Yes |
| 13 | IN | DC input; bypass to VSS with 1 uF to 10 uF | IN | Yes |
| 14 | TMR | Safety timer programming; 18 k to 72 k to VSS, VSS disables, float default | TMR | Yes |
| 15 | ITERM | Termination current programming, BQ24074 option | ITERM | Yes |
| 16 | ISET | Fast-charge current programming resistor 590 ohm to 8.9 k to VSS | ISET | Yes |
| 17 | Thermal Pad | Internally connected to VSS; must connect to VSS, not primary ground input | EP | Yes |
Footprint Cross-Check
Project footprint asset:
VQFN-16_L3.0-W3.0-P0.50-TL-EP1.7.Observed footprint details:
- 16 perimeter SMD pads on 0.50 mm pitch.
- Body nominal 3.0 mm x 3.0 mm.
- Exposed pad pad 17, 1.70 mm x 1.70 mm.
- Pin-1 marker present near the pin-1 corner.
- Pad numbering orientation matches the datasheet top-view convention: pins 1-4 on left side, 5-8 along bottom, 9-12 on right side, 13-16 along top, and exposed pad 17 in the center.
Status Output / Control Notes
- CHG and PGOOD are open-drain outputs and require pull-up resistors or LED pull-up paths in an application schematic.
- EN1 and EN2 select input current limit:
- EN2=0, EN1=0: USB100, 100 mA max input current.
- EN2=0, EN1=1: USB500, 500 mA max input current.
- EN2=1, EN1=0: resistor-programmed ILIM.
- EN2=1, EN1=1: standby / USB suspend.
- CE is active low; high disables charging while OUT remains active and supplement mode remains available.
Required External Components in an Application
The part symbol and footprint are library primitives, not a complete charger application. Designs using this part should include:
- IN bypass capacitor: 1 uF to 10 uF from IN to VSS.
- BAT bypass capacitor: 4.7 uF to 47 uF from BAT to VSS.
- OUT bypass capacitor: 4.7 uF to 47 uF from OUT to VSS.
- ISET resistor to VSS, 590 ohm to 8.9 k, otherwise charging is disabled.
- ILIM resistor to VSS, 1.1 k to 8 k when using EN2=1 / EN1=0; leaving ILIM open disables all charging.
- TS connection to 10 k NTC in the battery pack, or 10 k fixed resistor from TS to VSS if unused.
- Pull-ups or LED paths for CHG and PGOOD if status indication is used.
- VSS and EP both connected to board ground, with adequate copper/thermal vias for heat spreading.
Mismatches / Issues Found
- No symbol pin-number mismatch found. All 17 project terminals match the BQ24074 RGT datasheet pin names and numbers.
- No footprint pad-count mismatch found. The footprint has 16 perimeter pads plus exposed pad 17, matching the datasheet package.
- No footprint package-size mismatch found. The footprint is a 3 mm x 3 mm, 0.50 mm pitch VQFN with 1.7 mm exposed pad, consistent with the package naming and datasheet package family.
- Pin electrical/type metadata is incomplete. Every terminal currently has
Pin Type: Unspecified; the datasheet defines power, ground, input, output, and bidirectional/power-stage behavior. This may reduce ERC usefulness. - Terminal descriptions are incomplete. Project terminals do not currently carry the datasheet functional descriptions; adding pin descriptions would improve review quality.
Recommendation
The symbol and footprint are usable for BQ24074RGTT. The main improvement is metadata hygiene: update terminal pin types and descriptions to match the datasheet so automated checks and downstream users get correct electrical intent.
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