AP63203WU-7
3.3 V synchronous buck converter — Diodes Incorporated — C780769 — board-l U4 — rec-ap63203wu-7
Everything below is projected from this project's stored component evidence. Values keep the exact wording, conditions, units and verdicts they were recorded with — nothing here is re-typed, corrected, or combined into an overall judgement about the part.
This record in the catalog: AP63203WU-7
Identity
Record ID:
rec-ap63203wu-7Record kind: standalone
Manufacturer part number:
AP63203WU-7Manufacturer: Diodes Incorporated
Function: 3.3 V synchronous buck converter
LCSC ID:
C780769Package:
TSOT-26_L2.9-W1.6-P0.95-LS2.8-BLInventory line:
line-c780769Also known as:
logic buckOwner skill:
component-ap63203wu-7Fit: Fitted
Identity state: UNRESOLVED
Source state: SOURCE UNAVAILABLE
Coverage: 2 open of 4 published
Component references
Selected document
Datasheet PDF
AP63200/AP63201/AP63203/AP63205 3.8V to 32V Input 2A Synchronous Buck
Footprint preview
TSOT-26_L2.9-W1.6-P0.95-LS2.8-BL. Open SVGPackage model
Interactive inspection requires JavaScript and WebGL. The package identity remains available in this page.
This geometry represents a shared footprint package and may not exactly match the manufacturer part.
Placements
Every position this exact line occupies in the as-built design. One line may be placed many times and across more than one board.
| Board | Reference designator |
|---|---|
| board-l | U4 |
Coverage
Coverage is stated one domain at a time and is never rolled up. A domain marked open is a question that has not been answered; it is not a finding that the part is unsuitable. A record with no open domains has not thereby been declared safe.
topology-pins-limits-startup-faults
Coverage ID:
cov-ap63203-coreStatus: COVERED
Reason: fact-ap63203-topology through fact-ap63203-hiccup and fact-ap63203-project-nets
Facts in this domain:
lc-envelope-compensation-and-layout
Coverage ID:
cov-ap63203-lcStatus: COVERED
Reason: fact-ap63203-inductor-min through fact-ap63203-layout
Facts in this domain:
minimum-off-time
Coverage ID:
cov-ap63203-offStatus: OPEN
Reason: DS41326 gives 80 ns minimum on-time but no minimum off-time; the 220 ns bootstrap refresh interval is a different behavior.
Facts in this domain: none are recorded against it.
Blocked by: no blocking fact is recorded. What is missing has not been reduced to a specific recorded fact, so the reason above is the whole of what is known.
project-load-transients-and-thermal
Coverage ID:
cov-ap63203-loadStatus: OPEN
Reason: The generated source does not bound V3P3 load steps, sustained load, copper thermal impedance, or V15 transients.
Facts in this domain: none are recorded against it.
Blocked by: no blocking fact is recorded. What is missing has not been reduced to a specific recorded fact, so the reason above is the whole of what is known.
Facts
Each fact keeps its value, its unit, the conditions it holds under, where it came from and how far it has been confirmed as separate fields, because they are separate claims. A value without its conditions is not the same fact, and a verdict is about the evidence for the value, not about the part.
ABSOLUTE_MAXIMUM
A never-exceed limit. Reaching it may damage the part; it is not an operating target and there is no margin implied by it.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-ap63203-vin-absolute-dc | 35 | V | DC stress rating only | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Absolute Maximum Ratings table row VIN DC |
RECOMMENDED_OPERATION
The range the manufacturer intends the part to be used in. Always narrower than the absolute maximum.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-ap63203-topology | fixed 3.3 V synchronous peak-current-mode buck with integrated compensation and PFM at light load | NONE | AP63203 variant | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Features table rows AP63203 and Section PWM/PFM Operation |
fact-ap63203-vin-recommended-max | 32 | V | functional input range | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Recommended Operating Conditions table row VIN |
fact-ap63203-inductor-min | 2.2 | uH | general recommended inductor envelope | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Section Inductor row recommended range |
fact-ap63203-inductor-max | 10 | uH | general recommended inductor envelope | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Section Inductor row recommended range |
fact-ap63203-load-max | 2 | A | maximum continuous output design point | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Features table row continuous output current |
fact-ap63203-current-headroom | 0.35 | ratio | recommended inductor DC current rating headroom over maximum load | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Section Inductor row DC current rating at least 35% higher |
fact-ap63203-dcr-max | 0.1 | ohm | inductor DCR for highest efficiency | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Section Inductor row DCR less than 100mOhm |
fact-ap63203-cap-min | 22 | uF | general low-ESR ceramic output capacitance envelope | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Section Output Capacitor row 22uF to 68uF |
fact-ap63203-cap-max | 68 | uF | general low-ESR ceramic output capacitance envelope | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Section Output Capacitor row 22uF to 68uF |
GUARANTEED_ELECTRICAL
A parameter the manufacturer guarantees over the stated conditions, usually with minimum, typical and maximum values.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-ap63203-vout-min | 3.27 | V | CCM, recommended ambient/input range | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Electrical Characteristics table row AP63203 VFB minimum |
fact-ap63203-vout-max | 3.33 | V | CCM, recommended ambient/input range | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Electrical Characteristics table row AP63203 VFB maximum |
fact-ap63203-frequency | 1.1 | MHz | AP63203 oscillator typical with +/-6% frequency spread spectrum | NEEDS BENCH | PRIMARY-SPEC | src-ap6320x-ds41326: Electrical Characteristics table rows fSW and FSS |
fact-ap63203-min-on-time | 80 | ns | minimum on-time typical table value | NEEDS BENCH | PRIMARY-SPEC | src-ap6320x-ds41326: Electrical Characteristics table row tON |
fact-ap63203-soft-start | 4 | ms | built-in soft-start typical | NEEDS BENCH | PRIMARY-SPEC | src-ap6320x-ds41326: Electrical Characteristics table row tSS and Section Enable |
fact-ap63203-peak-limit-min | 2.5 | A | high-side cycle-by-cycle peak current limit minimum | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Electrical Characteristics table row IPEAK_LIMIT minimum |
TRANSIENT
Behaviour during a short event — startup, a switching edge, a fault or a surge.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-ap63203-vin-transient | 40 | V | maximum 400 ms stress pulse; not continuous operation | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Absolute Maximum Ratings table row VIN 400ms |
fact-ap63203-hiccup | 2 ms repeated peak-limit entry then 16 ms off before restart; overview also expresses 512/8192 cycles | NONE | persistent output overcurrent or short | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Section Overcurrent Protection and fault timing row |
THERMAL_SOA
Thermal and safe-operating-area behaviour: how much the part may dissipate, and under what mounting and ambient conditions.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-ap63203-thermal | thetaJA 89 C/W on stated single-layer 2 oz test board; application text targets TJ <=125 C although stress table lists 160 C | NONE | TSOT26; actual PCB differs | NEEDS BENCH | PRIMARY-SPEC | src-ap6320x-ds41326: Thermal Resistance table and Section Power Derating rows TJ |
fact-ap63203-layout | use 2 oz top/bottom copper, GND plane and vias; place VIN capacitors and FB network close; minimize switching loop | NONE | 2 A-capable PCB implementation | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Section PCB Layout rows 1-6 and Figure 25 |
PROJECT_STATE
A value this project recorded about how the part is used here — a chosen operating point, a net assignment, or a derived figure. Not a manufacturer specification.
| Fact | Value | Unit | Conditions | Verdict | Provenance | Evidence |
|---|---|---|---|---|---|---|
fact-ap63203-manufacturer | Diodes Incorporated | NONE | exact AP63203WU-7 orderable identity | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: title block and ordering table row AP63203WU-7 |
fact-ap63203-en-open | leave EN open for automatic startup via internal pull-up | NONE | default startup without external UVLO divider | PASS - primary-source confirmed | PRIMARY-SPEC | src-ap6320x-ds41326: Pin Descriptions table row EN and Section Enable |
fact-ap63203-min-off-time | not specified; 220 ns BST refresh is not a minimum off-time rating | NONE | AP63203 switching timing | UNSOURCED | UNVERIFIED | src-ap6320x-ds41326: Electrical Characteristics table and Section Bootstrap Capacitor row 220ns refresh |
fact-ap63203-required-inductor-current | 2.7 | A | full 2 A design envelope using 35% manufacturer headroom | PASS - primary-source confirmed | CALCULATED | src-ap6320x-ds41326 — CALCULATED: fact-ap63203-load-max times one plus fact-ap63203-current-headroom |
fact-ap63203-reference-l | 3.9 | uH | AP63203 3.3 V reference selection | NOT APPLICABLE | REFERENCE-DESIGN | src-ap6320x-ds41326: Table 2 row AP63203 3.3V |
fact-ap63203-reference-cap | 44 | uF | AP63203 3.3 V reference selection as 2x22 uF nominal | NOT APPLICABLE | REFERENCE-DESIGN | src-ap6320x-ds41326: Table 2 row AP63203 C2 |
fact-ap63203-project-nets | U4.1=V3P3; U4.2 EN open; U4.3=V15; U4.4=GND; U4.5=SW_LOGIC; U4.6=BST | NONE | current generated Board L source | NOT APPLICABLE | PROJECT-CHOICE | src-ap63203-generator: COMPONENTS table row U4, NETS rows, and NO_CONNECT row U4.2 |
Calculation dependencies
These values were derived from other recorded facts rather than read from a document. The expression and every input are published so the number can be recomputed instead of trusted. A derived value is never stronger than the weakest fact it depends on.
| Fact | Expression | Depends on |
|---|---|---|
fact-ap63203-required-inductor-current | fact_ap63203_load_max * (1 + fact_ap63203_current_headroom) | fact-ap63203-load-max, fact-ap63203-current-headroom |
Pin maps
The mapping between schematic pins and PCB pads, or physical terminals for an external part, as recorded. A record may carry more than one map when the same part is documented in more than one context.
pinmap-ap63203
Symbol:
AP63203WU-7Footprint:
TSOT-26_L2.9-W1.6-P0.95-LS2.8-BLPins: 6
Pin assignments
| Symbol pin | Name | Footprint pad | Function |
|---|---|---|---|
1 | FB | 1 | fixed-output sense at V3P3 |
2 | EN | 2 | open for automatic startup |
3 | VIN | 3 | V15 input |
4 | GND | 4 | power ground |
5 | SW | 5 | SW_LOGIC switching node |
6 | BST | 6 | bootstrap node |
Interactions
Behaviour that is not a property of this part alone. Each interaction names the records it spans, the conditions it holds under, and how far it has been confirmed. An interaction that spans several parts appears on every one of their pages, under the same identifier, because it is equally a fact about each.
int-ap63203-startup
Records involved:
rec-ap63203wu-7(this record)Conditions: EN intentionally open, V15 ramp/transient and downstream load defined
Verdict: NEEDS BENCH
Facts this rests on:
int-ap63203-power-stage
Records involved:
rec-ap63203wu-7(this record),rec-fnr4030s4r7mt,rec-cl21a226maqnnneConditions: full input/load/temperature envelope and PCB layout; nominal capacitance cannot establish guaranteed stability
Verdict: NEEDS BENCH
Facts this rests on:
fact-fnr-isat-marginon FNR4030S4R7MTfact-fnr-irated-marginon FNR4030S4R7MTfact-cl21-effective-capacitance-statuson CL21A226MAQNNNE
Cross-component rules
Rules that span several parts at once and are published in full on the integration page. Each rule's verdict below is that rule's own — it is a statement about the cross-component question, not about this part — and the exact wording of what the rule refuses to conclude is published with the rule itself.
rule-rail-envelope— rail-envelope — rule verdict: UNSOURCED — Whether every part on the input rail stays inside its own recorded limits across a legal power contract, a mis-contract, and a transient clamp event.rule-usb-pd-nvm-load-switch— usb-pd-nvm-load-switch — rule verdict: UNSOURCED — How the power-delivery controller's stored configuration and its enable output drive the load switch, through every state from detached to fault.rule-ap63203-logic-stage— ap63203-logic-stage — rule verdict: UNSOURCED — How the logic-rail converter, its inductor and its output capacitor behave together under the real load the microcontroller presents.rule-evidence-chain— source-to-bench-chain — rule verdict: NEEDS BENCH — How far each claim has travelled from a manufacturer document towards a measurement on real hardware, stage by stage.rule-c5446803-power-cut— board-mounted lamp power switching — rule verdict: NEEDS BENCH
Sources
Every document cited above, with its identification, when it was retrieved, and what kind of authority it carries. Sources that could not be retrieved are listed too, with their unavailability stated, so a gap in the evidence is visible rather than absent.
AP63200/AP63201/AP63203/AP63205 3.8V to 32V Input 2A Synchronous Buck
Source ID:
src-ap6320x-ds41326Document number: DS41326
Revision: Rev. 3-2
Document date: 2024-11
Retrieved: 2026-08-02
Authority: MANUFACTURER_PRIMARY
Locator: Pin Descriptions table; Absolute Maximum and Electrical Characteristics tables; Application Information sections 3-13; Tables 2 and Figures 21/25
Printed page: 2 of 18
Availability: AVAILABLE
Document URL: https:
/ / www. diodes. com/ datasheet/ download/ AP63200- AP63201- AP63203- AP63205. pdf
Board L generated schematic specification
Source ID:
src-ap63203-generatorDocument number: scripts/schgen/board_l_spec.py
Revision: 410bc1a342286dd6c205d6dcec0f248b8a963987
Document date: 2026-08-02
Retrieved: 2026-08-02
Authority: PROJECT_GENERATOR
Locator: COMPONENTS table row U4, NETS rows V15, V3P3, SW_LOGIC, BST, GND, and NO_CONNECT row U4.2
Printed page: source file
Availability: AVAILABLE
Legend
What the recorded terms on this page mean, in ordinary words. The exact terms above are the ones that count; these descriptions explain them and never replace them.
Verdict
| Recorded term | What it means |
|---|---|
NEEDS BENCH | Cannot be settled from documents. It needs measurement on real hardware before it can be relied on. |
NOT APPLICABLE | The parameter does not apply to this part as it is used here. |
PASS - primary-source confirmed | Confirmed against the manufacturer's own document for this exact part. |
UNSOURCED | No accepted source backs this value yet. Treat it as a claim, not a fact. |
Provenance
| Recorded term | What it means |
|---|---|
CALCULATED | Derived arithmetically from other facts listed here. The expression and every input are shown, so the number can be recomputed rather than trusted. |
PRIMARY-SPEC | Taken from the manufacturer's own specification document. |
PROJECT-CHOICE | A decision made by this project. No vendor asserts it. |
REFERENCE-DESIGN | Taken from a vendor reference design or application note rather than the device specification. |
UNVERIFIED | Recorded, but not yet backed by an accepted source. |
Fact class
| Recorded term | What it means |
|---|---|
ABSOLUTE_MAXIMUM | A never-exceed limit. Reaching it may damage the part; it is not an operating target and there is no margin implied by it. |
GUARANTEED_ELECTRICAL | A parameter the manufacturer guarantees over the stated conditions, usually with minimum, typical and maximum values. |
PROJECT_STATE | A value this project recorded about how the part is used here — a chosen operating point, a net assignment, or a derived figure. Not a manufacturer specification. |
RECOMMENDED_OPERATION | The range the manufacturer intends the part to be used in. Always narrower than the absolute maximum. |
THERMAL_SOA | Thermal and safe-operating-area behaviour: how much the part may dissipate, and under what mounting and ambient conditions. |
TRANSIENT | Behaviour during a short event — startup, a switching edge, a fault or a surge. |
Coverage status
| Recorded term | What it means |
|---|---|
COVERED | Every question this domain asks is answered by the facts listed against it. |
OPEN | Unresolved. Open means the question has not been answered, not that the part is unsafe — the reason states what is missing. |
Source availability
| Recorded term | What it means |
|---|---|
AVAILABLE | The document was retrieved and is on record. |
Source authority
| Recorded term | What it means |
|---|---|
MANUFACTURER_PRIMARY | The manufacturer's own document for this exact part. |
PROJECT_GENERATOR | A document this project generated, such as a schematic or netlist export. |
Identity state
| Recorded term | What it means |
|---|---|
UNRESOLVED | The exact orderable part is not yet confirmed. Substituting a same-name part from another vendor is not permitted on that basis. |
Source state
| Recorded term | What it means |
|---|---|
SOURCE UNAVAILABLE | No document backing this line could be retrieved. |
Unit
| Recorded term | What it means |
|---|---|
NONE | The value is not a physical quantity, so it carries no unit. Recorded as `NONE`. |
Raw agent resource
This page is generated from a stored evidence bundle and does not restate it. The bundle is the source of truth: where the two ever disagree, the bundle is right and this page is stale.
Open the owning bundle component-ap63203wu-7