MAX25231 Part Review

Worked for 11 mins 59 sec

Likely validation findings for MAX25231ATCB/V+T:

Confident flags 1. Incorrect manufacturer metadata

Current: Analog Devices
Likely correct: Analog Devices / Maxim Integrated

This is mildly nuanced because Maxim is now part of Analog Devices, but for a Maxim-origin part the manufacturer is often represented as Analog Devices Inc./Maxim Integrated or Analog Devices / Maxim. If Flux expects the current corporate owner, “Analog Devices” is acceptable. If it expects the datasheet/manufacturer branding, “Maxim Integrated / Analog Devices” is more precise.

Flag confidence: Medium, not severe.

2. Incorrect part type / subtype / logic function

Current metadata:

Part type: Integrated Circuits
Subtype: Logic
logicFunction: AND

Correct function: Switching voltage regulator / buck converter / DC-DC converter.

This is a clear mismatch. The MAX25231 is not a logic IC and has no AND-gate function. It should be categorized as something like:

Integrated Circuits
Power Management IC
DC-DC Switching Regulator
Buck Converter / Step-Down Converter

Flag confidence: High.
Severity: High metadata error.

3. Description has encoding issue

Current description: 36V, 1.2A Mini Buck Converter with 3.5?A IQ

The ?A is almost certainly a bad encoding/rendering of µA.

Corrected description should likely be:

36V, 1.2A Mini Buck Converter with 3.5µA IQ

Flag confidence: High.
Severity: Low to medium metadata quality issue.

4. Pin electrical types/descriptions missing

Current: Pin type unspecified and no pin descriptions.

For a power-management IC, pin roles matter. These should not all be generic/unspecified if the library supports terminal metadata.

Suggested pin roles/descriptions:

Table

Pin	Name	Likely role
1	SPS	Input/config/control, spread-spectrum setting or mode-related pin depending datasheet
2	EN	Digital input / enable
3	BST	Bootstrap supply pin
4	SUP	Power input / supply input
5	LX	Switching node / power output switch node
6	PGND	Power ground
7	AGND	Analog ground
8	FB	Feedback input
9	OUT	Regulator output sense/output-related pin
10	BIAS	Bias supply/input/output depending datasheet details
11	SYNC	Synchronization input
12	PGOOD	Power-good output, likely open-drain
13	EP	Exposed pad, ground/thermal

At minimum, SUP, PGND, AGND, LX, FB, EN, PGOOD, EP should have meaningful pin typing/descriptions.

Flag confidence: High that metadata is incomplete.
Severity: Medium to high, because pin types affect ERC quality.

5. EP should be described as ground/thermal

Current: Pin 13 EP exists but no description/type.

Official info says EP is ground/thermal. It should be tied to ground per datasheet recommendations, usually PGND/AGND ground plane/thermal pad depending the layout guidance.

Flag confidence: High.
Severity: Medium.

Footprint/package checks 6. Terminal count of 13 is acceptable despite “12 TDFN”

The official package is “12 TDFN-CU” but includes 12 perimeter pins plus exposed pad. Flux terminal count of 13 is therefore reasonable if the exposed pad is represented as pin 13.

Do not flag terminal count as wrong.

Confidence: High.

7. Footprint name is broadly plausible but package naming may be generic

Current footprint: SON50P300X300X80-13N.kicad_mod

This implies:

SON/TDFN-style package
0.50 mm pitch
3.00 × 3.00 mm body
0.80 mm height
13 terminals including EP

Official:

12 TDFN-CU
package code TD1233+2C
outline 21-0664
land pattern 90-0397
3 mm × 3 mm class package
12 pins + EP

The footprint naming is not exact to ADI’s package code, but it appears mechanically in the right family.

Flag confidence: Low as an error.
Recommendation: Cautiously note that the footprint should be verified against ADI land pattern 90-0397.

8. Footprint terminal pad length appears longer than official land pattern

Current side pads: 0.30 × 0.85 mm
Official land pattern visible dims: terminal pad width 0.30 mm, terminal pad length 0.65 mm

Width matches. Length differs by +0.20 mm.

This could be significant, but IPC-derived footprints often extend pads beyond nominal manufacturer land pattern for solder fillet requirements. However, if ADI 90-0397 explicitly says 0.65 mm land length, then 0.85 mm may be oversized.

Flag confidence: Medium.
Severity: Cautious/medium, not a guaranteed failure without seeing the full 90-0397 drawing and coordinate convention.

Suggested wording:

Footprint side pad width and pitch match the ADI land pattern, but the side pad length is 0.85 mm versus the visible ADI 90-0397 land pattern value of 0.65 mm. This should be reviewed; it may be an IPC-style extension, but it does not directly match the manufacturer land pattern.

9. Exposed pad footprint size is close but not exact

Current EP: 1.65 × 2.60 mm
Official land pattern: exposed pad 1.70 × 2.50 mm
Package outline EP/package pad tolerance: D2 1.45/1.55/1.65, E2 2.4/2.5/2.6

The footprint EP appears to use max package pad dimensions or close to them: 1.65 × 2.60. The land pattern says 1.70 × 2.50. Differences:

X/D direction: current 1.65 vs land 1.70, smaller by 0.05 mm
Y/E direction: current 2.60 vs land 2.50, larger by 0.10 mm

This is close. The EP size is not wildly wrong, but it does not match the cited land pattern exactly.

Flag confidence: Medium-low.
Severity: Cautious.

Suggested wording:

Exposed pad dimensions are close to the package/land-pattern values but not an exact match to ADI 90-0397. Current EP is 1.65 × 2.60 mm versus extracted land pattern 1.70 × 2.50 mm. This is probably acceptable only if intentionally based on IPC or package max dimensions; otherwise align to manufacturer land pattern.

10. Side pad coordinates likely imply correct pitch/count

Side pads at y:

−1.25, −0.75, −0.25, +0.25, +0.75, +1.25

That is 6 pads per side at 0.50 mm pitch, matching 12 pins total. X at ±1.45 with 3.0 mm body is plausible for leadless side lands.

Do not confidently flag pitch/count as wrong.

Confidence: High that this is broadly plausible.

Pinout sanity check 11. Pin names/order appear to match official list

Given pins:

1 SPS
2 EN
3 BST
4 SUP
5 LX
6 PGND
7 AGND
8 FB
9 OUT
10 BIAS
11 SYNC
12 PGOOD
13 EP

You state official ADI pins are as listed. Therefore the schematic pin names and numbering appear correct.

Do not flag pinout as wrong.

Confidence: High, assuming the official pin list has been transcribed correctly.

12. Fixed 3.3 V variant metadata should mention fixed output

Part number MAX25231ATCB/V+ is stated to be the fixed 3.3 V variant. Current description only says generic “36V, 1.2A Mini Buck Converter...”

The metadata should ideally include:

fixed 3.3 V output
automotive-qualified /V variant if applicable
buck regulator / step-down converter
1.2 A output current
36 V input capability
low-IQ 3.5 µA

Flag confidence: Medium-high.
Severity: Medium metadata completeness issue.

Suggested validation summary Flag confidently

Subtype/function is wrong: marked as Logic / AND, but this is a buck DC-DC regulator.
Description encoding error: 3.5?A should be 3.5µA.
Pin metadata incomplete: pin types and descriptions are missing.
EP metadata incomplete: exposed pad should be documented as ground/thermal.
Part should identify fixed 3.3 V variant: MAX25231ATCB/V+ is not just a generic adjustable buck if official source says fixed 3.3 V.

Flag cautiously / review recommended

Manufacturer naming: “Analog Devices” is acceptable after Maxim acquisition, but “Analog Devices / Maxim Integrated” may be more precise.
Footprint side pad length: current 0.85 mm vs ADI land pattern 0.65 mm; review against 90-0397.
Exposed pad dimensions: current 1.65 × 2.60 mm vs land pattern 1.70 × 2.50 mm; close but not exact.
Footprint/package name: generic SON naming is plausible, but should be mapped to ADI TD1233+2C / outline 21-0664 / land pattern 90-0397.

Do not flag

Terminal count 13: acceptable because 12 TDFN pins plus exposed pad.
Schematic pin names/numbering: appear correct.
Pitch/body size/basic pad arrangement: broadly consistent with 12-pin 3 × 3 mm, 0.5 mm-pitch TDFN/SON-style package.

Worked for 1 min 30 sec

Created a project doc

MAX25231ATCB/V+T Part Review

View Document

Date: 2026-07-23 Current Flux library part/project: MAX25231ATCB_V+T

flux

Completed the MAX25231ATCB/V+T review and created the detailed report: MAX25231ATCB/V+T Part Review.

Open items:

Datasheet URL was already set to an official ADI URL, so I did not change it.
Main mismatches: wrong subtype/function metadata (Logic / AND), missing pin descriptions/types, description encoding issue (3.5?A → 3.5µA), incomplete package metadata, and footprint dimensions that don’t exactly match ADI land pattern 90-0397.

Suggested next steps:

Update the part metadata and pin descriptions.
Decide whether to revise the footprint to match ADI/Maxim 90-0397 exactly.
Re-run a final part-quality check after those edits.

Fix metadata and footprint

Fix part metadata

Revise footprint

Run final review

SPS

Pin Number

BST

Pin Number

OUT

Pin Number

AGND

Pin Number

SYNC

Pin Number

PGOOD

Pin Number

SUP

Pin Number

PGND

Pin Number

BIAS

Pin Number

Refine this doc

Ask about this doc

MAX25231ATCB/V+T Part Review

Date: 2026-07-23

Sources checked

Current Flux library part/project: MAX25231ATCB_V+T
Existing Datasheet URL property: https://www.analog.com/MAX25231/datasheet
Official Analog Devices datasheet PDF: https://www.analog.com/media/en/technical-documentation/data-sheets/max25231.pdf
Official package outline: https://pdfserv.maximintegrated.com/package_dwgs/21-0664.PDF
Official land pattern: https://pdfserv.maximintegrated.com/land_patterns/90-0397.PDF

The existing Datasheet URL is already populated and points to the official Analog Devices MAX25231 datasheet page, so no datasheet-property update was required.

Current part metadata observed

Table

Field	Current value	Datasheet / official reference check
Part/project name	`MAX25231ATCB_V+T`	Represents orderable MPN `MAX25231ATCB/V+T`; acceptable sanitized project name.
Manufacturer Part Number	`MAX25231ATCB/V+T`	Matches orderable code with tape-and-reel suffix. Datasheet ordering table lists `MAX25231ATCB/V+`; `T` is the tape/reel ordering suffix.
Manufacturer	Analog Devices	Acceptable current manufacturer/owner; Maxim-origin part now under ADI.
Description	`36V, 1.2A Mini Buck Converter with 3.5?A IQ`	Functionally correct, but encoding is wrong: should be `3.5µA IQ`. Should also mention fixed 3.3 V variant.
Terminal count	13	Correct if exposed pad is modeled as pin 13: 12 TDFN leads + exposed pad.
Datasheet URL	`https://www.analog.com/MAX25231/datasheet`	Official ADI URL is present. Direct PDF is `https://www.analog.com/media/en/technical-documentation/data-sheets/max25231.pdf`.
Part Type	Integrated Circuits	Broadly acceptable, but too generic.
Subtype / IC type	Logic	Mismatch: this is a PMIC / buck DC-DC regulator, not a logic IC.
Logic Function	AND	Mismatch: MAX25231 is not an AND gate.
Package property	Not observed in part metadata returned by library search	Should identify 12 TDFN-CU, package code `TD1233+2C`, outline `21-0664`, land pattern `90-0397`.

Key datasheet specs

Table

Spec	Datasheet value
Manufacturer / family	Analog Devices / Maxim Integrated MAX25231
Function	36 V, 1.2 A mini buck converter with low quiescent current
Variant reviewed	`MAX25231ATCB/V+` / `MAX25231ATCB/V+T`
Output option	Fixed 3.3 V output
Operating input voltage	`VSUP = 3.5 V to 36 V`; after soft-start, `3 V to 36 V`; 40 V transient tolerance for `t < 1 s`
Output current	1.2 A
Quiescent current	3.5 µA typ / 8 µA max no-load, no-switching for MAX25231ATCB/V+; 4.5 µA typ no-load switching; shutdown 1 µA typ / 5 µA max
Switching frequency	2.1 MHz typ; 1.925 MHz min / 2.275 MHz max
External sync range	1.7 MHz to 2.6 MHz
Spread spectrum	±6% when SPS is high
Package	12 TDFN-CU, 3 mm × 3 mm, exposed pad
Package code	`TD1233+2C`
Package outline	`21-0664`
Land pattern	`90-0397`
Thermal resistance	θJA 41 °C/W, θJC 8.5 °C/W on four-layer board

Pinout cross-check

The schematic symbol terminal names and pin numbers match the datasheet pin table.

Table

Pin	Current symbol name	Datasheet function summary	Result
1	SPS	Spread-spectrum enable; high enables spread spectrum, low disables; 1 MΩ internal pulldown	Match
2	EN	High-voltage-compatible enable input; low turns part off	Match
3	BST	Bootstrap pin for high-side driver; use 0.1 µF from BST to LX	Match
4	SUP	Supply input; connect 4.7 µF ceramic to PGND	Match
5	LX	Buck switching node; connect 4.7 µH inductor between LX and OUT	Match
6	PGND	Power ground for high-current/high-frequency return	Match
7	AGND	Analog ground for quiet signals	Match
8	FB	Feedback pin; for fixed-voltage configs connect to BIAS	Match
9	OUT	Buck output-voltage sense input; bypass to PGND with 22 µF ceramic	Match
10	BIAS	5 V internal BIAS supply; connect at least 1 µF ceramic to AGND	Match
11	SYNC	Sync/mode input; grounded/open enables skip mode, BIAS enables forced PWM; 1 MΩ internal pulldown	Match
12	PGOOD	Open-drain reset/power-good output; external pullup required	Match
13 / EP	EP	Exposed pad; connect to PCB ground plane for thermal transfer; not current-carrying	Match as modeled terminal, but missing metadata

Symbol / pin metadata findings

Pin names and numbers are correct.
All terminal Pin Type properties are currently Unspecified; this is incomplete for a power IC and reduces ERC usefulness.
Pin Description metadata is missing for every terminal.
Recommended pin typing/descriptions should classify at least: SUP = Power input, PGND/AGND/EP = Ground/Thermal, LX = switching power node, BST/BIAS = supply/bias support pins, FB = analog feedback input, EN/SPS/SYNC = control inputs, PGOOD = open-drain output.

Footprint cross-check

Current footprint asset: SON50P300X300X80-13N.kicad_mod

Observed current footprint geometry from the KiCad asset:

Table

Feature	Current footprint
Body/fab outline	3.0 mm × 3.0 mm
Pin count	12 perimeter pads + EP = 13 pads
Pitch	0.50 mm
Perimeter pad size	0.30 mm × 0.85 mm
Perimeter pad centers	X = ±1.45 mm; Y = ±1.25, ±0.75, ±0.25 mm
Exposed pad	1.65 mm × 2.60 mm
Pin-1 indicator	Present
3D model	`MAX25231ATCB_V+T.stp` present

Official package / land pattern dimensions extracted from ADI/Maxim PDFs:

Table

Feature	Official value
Package code	`TD1233+2C`
Package body, D/E	2.95 / 3.00 / 3.05 mm min/nom/max
Package height, A	0.70 / 0.75 / 0.80 mm min/nom/max
Lead pitch, e	0.50 mm BSC
Lead width, b	0.20 / 0.25 / 0.30 mm min/nom/max
Lead length, L	0.30 / 0.40 / 0.50 mm min/nom/max
Package exposed pad D2	1.45 / 1.55 / 1.65 mm min/nom/max
Package exposed pad E2	2.40 / 2.50 / 2.60 mm min/nom/max
Land pattern terminal pad width	0.30 mm
Land pattern terminal pad length	0.65 mm
Land pattern pitch	0.50 mm
Land pattern exposed pad	1.70 mm × 2.50 mm

Footprint assessment:

Basic family, body size, pin count, pitch, and pin-1 indicator are plausible for the MAX25231 package.
Perimeter pad width and pitch match the land pattern values.
Perimeter pad length differs: current footprint uses 0.85 mm, while the visible ADI/Maxim 90-0397 land pattern value is 0.65 mm. This should be reviewed; it may be an IPC-style extension, but it does not directly match the manufacturer land-pattern drawing.
Exposed pad is close but not identical: current is 1.65 mm × 2.60 mm; ADI/Maxim land pattern is 1.70 mm × 2.50 mm. The current exposed pad matches the package maximum dimensions in one orientation more than the recommended land pattern.
Footprint name is generic (SON50P300X300X80-13N) rather than explicitly tied to ADI TD1233+2C / 21-0664 / 90-0397; that is not necessarily wrong, but the geometry should be intentionally mapped to the official land pattern.

Mismatches / issues to flag

High-confidence metadata mismatches

Wrong IC subtype/function metadata: current subtype/function says Logic / AND, but the part is a switching buck regulator / PMIC.
Description encoding issue: 3.5?A should be 3.5µA.
Pin metadata incomplete: all pins have Pin Type = Unspecified, and no pin descriptions are present.
Package metadata incomplete: metadata should identify 12 TDFN-CU, package code TD1233+2C, outline 21-0664, land pattern 90-0397.
Variant detail missing from description: MAX25231ATCB/V+ is the fixed 3.3 V output variant.

Footprint items needing review

Side pad length: 0.85 mm current vs 0.65 mm official land-pattern value.
Exposed pad size: 1.65 mm × 2.60 mm current vs 1.70 mm × 2.50 mm official land pattern.
Footprint naming/source traceability: generic footprint name should be documented or revised to directly reference ADI package code/land pattern.

Items that appear correct

MPN MAX25231ATCB/V+T matches the official orderable family/variant, including tape-and-reel suffix.
Datasheet URL is present and official.
Terminal count of 13 is correct when EP is modeled.
Schematic symbol pin names and pin numbers match the datasheet pin table.
Footprint body class, 0.50 mm pitch, 12 side pads, EP, and pin-1 indicator are broadly consistent with the 12 TDFN-CU package.

Recommended next fixes

Change IC subtype/function metadata from Logic / AND to PMIC / DC-DC Buck Regulator / Switching Regulator.
Update description to: 36V, 1.2A fixed 3.3V mini buck converter with 3.5µA IQ.
Add pin descriptions and meaningful pin types for all 13 terminals.
Add package metadata: 12 TDFN-CU, TD1233+2C, 21-0664, 90-0397.
Decide whether to keep the current IPC-style footprint or revise it to exactly match ADI/Maxim land pattern 90-0397.

Sources checked
Current part metadata observed
Key datasheet specs
Pinout cross-check
Symbol / pin metadata findings
Footprint cross-check
Mismatches / issues to flag
High-confidence metadata mismatches
Footprint items needing review
Items that appear correct
Recommended next fixes

Reviews

Documents

MAX25231ATCB/V+T Part Review

Assets

MAX25231ATCB_V+T

SON50P300X300X80-13N.kicad_modFootprint

MAX25231ATCB_V+T

MAX25231ATCB_V+T.stp3D Model

MAX25231ATCB_V+T

MAX25231ATCB_V+T Symbol.svgDefault

MAX25231ATCBV+-thumb.png

MAX25231ATCBV+-thumbThumbnail

Project Name

MAX25231ATCB/V+

Description

Buck Regulator Positive Output Step-Down DC-DC Controller IC 12-TDFN (3x3)

Automotive Synchronous Buck Converter: MAX25231ATCB/V+ is a high-efficiency synchronous step-down converter designed for automotive applications, operating from a 4.5V to 36V input supply and providing up to 2A output current. It integrates a 2.1MHz switching frequency, forced-PWM mode, and is housed in a 12-pin 3mm × 3mm TDFN package.

#Automotive #SynchronousBuckConverter #StepDownConverter #PowerManagement #AnalogDevices #MaximIntegrated #PCBComponent

Properties

Manufac… Number

MAX25231ATCB/V+

Manufac…er Name

Analog Devices Inc./Maxim Integrated

Part Type

Integrated Circuits

Datasheet URL

analog.com/MAX25231/datasheet

Designator Prefix

Symbol Style

parametric-v1

License

creativecommons.org/licenses/by/4.0/

Pricing & Availability

DPN	Stock	Qty 1
2	0	$2.124–$3.8669
1	3.9K	$3.92
1	1.2K	$1.8677

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