LM2596S-ADJ
Adjustable buck/inverting DC-DC converter IC, intermediate-rail generation — UMW — C347423 — board-b U3 (fitted), U4 (fitted) — rec-lm2596s-adj-c347423
Generated from the component evidence records — edit the records, not this page.
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: LM2596S-ADJ
Identity
| Field | Recorded value |
|---|---|
| Record ID | rec-lm2596s-adj-c347423 |
| Record kind | standalone |
| Manufacturer part number | LM2596S-ADJ |
| Manufacturer | UMW |
| Function | Adjustable buck/inverting DC-DC converter IC, intermediate-rail generation |
| LCSC ID | C347423 |
| Package | TO-263-5_L10.2-W8.9-P1.70-BR |
| Inventory line | line-c347423 |
| Also known as | adjustable step-down buck converter, inverting buck-boost converter |
Fit: Fitted
Identity state: VERIFIED
Source state: AVAILABLE
Coverage: 3 open of 8 published
Documents and package
Datasheet PDF
Footprint preview
TO-263-5_L10.2-W8.9-P1.70-BR. 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.
Datasheet PDF — UMW LM2596/LM2596HV 3A Step-Down Voltage Regulator
Selected source ID: src-lm2596-umw-ds
Authority: MANUFACTURER_PRIMARY
Availability: AVAILABLE
Package footprint: TO-263-5_L10.2-W8.9-P1.70-BR
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-b | U3 |
| board-b | 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.
identity-package-pinout
Coverage ID: cov-lm2596-identity · Status: COVERED
Reason: fact-lm2596-manufacturer, fact-lm2596-ordering-package, and fact-lm2596-pinout are primary-source confirmed from the manufacturer datasheet
Facts in this domain:
input-voltage-envelope
Coverage ID: cov-lm2596-input-envelope · Status: COVERED
Reason: 45 V absolute maximum and 4.75-40 V operating supply range are primary-source confirmed
Facts in this domain:
feedback-reference
Coverage ID: cov-lm2596-feedback-reference · Status: COVERED
Reason: 1.23 V typical feedback reference with guaranteed 1.193/1.267 V limits (1.180/1.280 over temperature), the +/-4% line/load tolerance, and the 1.2-37 V adjustable range are primary-source confirmed
Facts in this domain:
on-off-control
Coverage ID: cov-lm2596-onoff · Status: COVERED
Reason: ON/OFF thresholds, the -0.3 to +25 V pin limit, and the inverting-configuration ground-pin reference behavior are primary-source confirmed
Facts in this domain:
switch-power-stage
Coverage ID: cov-lm2596-power-stage · Status: COVERED
Reason: 4.5 A typical / 3.6 A minimum switch current limit, the 150 kHz oscillator, and the switch saturation voltage (1.16 V typ, 1.4 V max at 25 C / 1.5 V max over temperature) are primary-source confirmed; the Vsat rows close the omission issue #171 raised in the -13.5V output-cap ripple model
Facts in this domain:
converter-setpoints
Coverage ID: cov-lm2596-setpoints · Status: OPEN
Reason: the +13.53 / +7.503 / -13.53 V setpoints are nominal calculations from the typical reference and nominal divider values; no board has ever regulated (v4 never negotiated input power), so the rails carry NEEDS BENCH until measured on board-b
Facts in this domain:
Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.
u4-inverting-stress
Coverage ID: cov-lm2596-u4-stress · Status: OPEN
Reason: the 28.5 V effective-input chain and its 16.5 V / 11.5 V margins are arithmetic on design targets; actual VBUS, the inverting startup inrush against the current-limited USB-PD source, and switch-node transients need bench confirmation on the dead-v4 diagnosis and board-b bring-up
Facts in this domain:
Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.
thermal-on-project-pcb
Coverage ID: cov-lm2596-thermal · Status: OPEN
Reason: datasheet thetaJA values assume specific 1 oz copper test areas; the board-b layout does not exist yet, so the real dissipation envelope for U2/U3/U4 needs layout data and bench thermals
Facts in this domain:
Blocked by: these facts must be resolved before the domain can close. Each is listed in full under Facts.
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: fact-lm2596-vin-absmax
Value: 45 · Unit: V
Conditions: LM2596 (non-HV) Maximum Supply Voltage; damage limit per Note 1, not an operating rating
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Evidence: src-lm2596-umw-ds: Absolute Maximum Ratings table row Maximum Supply Voltage LM2596 (printed page 4)
Fact: fact-lm2596-onoff-absmax
Value: -0.3 to +25 · Unit: V
Conditions: ON/OFF pin input voltage limit relative to the device GND pin; Feedback pin carries the same -0.3 to +25 V limit
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
RECOMMENDED_OPERATION
The range the manufacturer intends the part to be used in. Always narrower than the absolute maximum.
Fact: fact-lm2596-vin-operating-max
Value: 40 · Unit: V
Conditions: operating supply range 4.75 V to 40 V for LM2596 (non-HV); -40C<=TJ<=+125C
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Evidence: src-lm2596-umw-ds: Operating Conditions table row Supply Voltage LM2596 (printed page 4)
Fact: fact-lm2596-vout-adjust-range
Value: 1.2 to 37 · Unit: V
Conditions: adjustable version output voltage range (57 V for the HV version); +13.53/-13.53 setpoint magnitudes fall inside this range
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-inverting-topology-support
Value: manufacturer-documented inverting application: positive input to negative output with common ground by bootstrapping the regulator GND pin to the negative output and grounding the feedback divider return; usable with the adjustable version · Unit: NONE
Conditions: Application Information Inverting Regulator section; output current capability depends on both input and output voltage (Figure 26 guide)
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
GUARANTEED_ELECTRICAL
A parameter the manufacturer guarantees over the stated conditions, usually with minimum, typical and maximum values.
Fact: fact-lm2596-fb-vref
Value: 1.23 · Unit: V
Conditions: ADJ version feedback voltage, typical; 4.5V<=VIN<=40V, 0.2A<=ILOAD<=3A, VOUT programmed for 3 V, Circuit of Figure 1, TJ=25C
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-fb-vref-min
Value: 1.193 · Unit: V
Conditions: ADJ feedback voltage guaranteed minimum at TJ=25C; 1.180 V bold limit over full operating temperature range; same line/load conditions as the typical
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-fb-vref-max
Value: 1.267 · Unit: V
Conditions: ADJ feedback voltage guaranteed maximum at TJ=25C; 1.280 V bold limit over full operating temperature range; same line/load conditions as the typical
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-output-tolerance
Value: 0.04 · Unit: ratio
Conditions: output voltage tolerance, maximum over line and load conditions (Features list)
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Evidence: src-lm2596-umw-ds: Features section row '+/-4% max over line and load conditions' (printed page 1)
Fact: fact-lm2596-onoff-thresholds
Value: threshold typ 1.3 V; regulator ON guaranteed at <=0.6 V (low), OFF guaranteed at >=2 V (high); input current 5 uA typ at VLOGIC=2.5V, 0.02 uA typ at VLOGIC=0.5V; low or floating = ON · Unit: NONE
Conditions: measured relative to the device GND pin; TJ=25C typicals, bold limits over full temperature range; VIN=12V, ILOAD=500mA test conditions
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-current-limit
Value: 4.5 · Unit: A
Conditions: switch peak current limit, typical; guaranteed 3.6 A min at TJ=25C (3.4 A over temp), 6.9 A max (7.5 A over temp); Notes 7/8 test conditions (output forced, switch ON)
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-oscillator-frequency
Value: 150 · Unit: kHz
Conditions: fixed internal oscillator, typical; guaranteed 117 kHz min / 183 kHz max including temperature extremes
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-vsat
Value: 1.16 · Unit: V
Conditions: internal output-switch saturation voltage, typical at TJ=25C; test condition IOUT=3A with Note 7 (no diode, inductor or capacitor connected to the output pin) and Note 8 (feedback pin removed from output and tied to 0V to force the output transistor ON); the same 1.16 V typical is restated as the VSAT term of the datasheet's own buck E*T inductor-selection formula
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-vsat-max
Value: 1.4 · Unit: V
Conditions: guaranteed maximum output-switch saturation voltage at TJ=25C (standard-typeface limit, matching the bundle's min/max convention set by fact-lm2596-fb-vref-max/-min); the boldface full-operating-temperature-range limit is 1.5 V; same IOUT=3A Notes 7/8 test conditions as the typical (fact-lm2596-vsat)
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-fb-vref-min-full-temp
Value: 1.18 · Unit: V
Conditions: ADJ feedback voltage minimum, boldface full operating temperature range limit; 4.5V<=VIN<=40V, 0.2A<=ILOAD<=3A, VOUT programmed for3V. The application converter still needs line/load/ripple validation.
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-fb-vref-max-full-temp
Value: 1.28 · Unit: V
Conditions: ADJ feedback voltage maximum, boldface full operating temperature range limit; 4.5V<=VIN<=40V, 0.2A<=ILOAD<=3A, VOUT programmed for3V. The application converter still needs line/load/ripple validation.
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
TRANSIENT
Behaviour during a short event — startup, a switching edge, a fault or a surge.
Fact: fact-lm2596-inverting-startup-current
Value: inverting startup can draw input current up to the current limit (approx 4.5 A) for 2 ms or more until the output reaches nominal; current-limited input sources may not start correctly; delayed-startup circuit and enlarged CIN recommended · Unit: NONE
Conditions: inverting configuration startup; directly relevant to the current-limited USB-PD 15 V input feeding board-b
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
THERMAL_SOA
Thermal and safe-operating-area behaviour: how much the part may dissipate, and under what mounting and ambient conditions.
Fact: fact-lm2596-thermal
Value: thetaJC 2 C/W; TO-263 thetaJA 50 C/W with tab on 0.5 in2, 30 C/W on 2.5 in2, 20 C/W on 3 in2 plus approx 16 in2 backside (all 1 oz copper); TJ operating -40 to +125 C, abs max +150 C · Unit: NONE
Conditions: TO-263 tab soldered to PCB per notes 12-14 test boards; board-b layout does not exist yet so the actual copper area and dissipation are undetermined
Verdict: NEEDS BENCH · Provenance: PRIMARY-SPEC
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: fact-lm2596-manufacturer
Value: UMW · Unit: NONE
Conditions: exact orderable identity; title block names UTD Semiconductor Co.,Limited with UMW branding and www.umw-ic.com
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-ordering-package
Value: LM2596S-ADJ = adjustable-output orderable in TO-263, -40C<=TA<=125C · Unit: NONE
Conditions: ordering matrix for the ADJ output voltage row
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Evidence: src-lm2596-umw-ds: Ordering information table row ADJ / LM2596S-ADJ, TO-263 column (printed page 3)
Fact: fact-lm2596-pinout
Value: TO-263: 1=VIN, 2=Output, 3=GND, 4=Feedback, 5=ON/OFF (active low or floating) · Unit: NONE
Conditions: 5-lead TO-263; the package tab is referenced only thermally (notes 12-14), its electrical net is a project mapping
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-onoff-inverting-note
Value: in the inverting configuration the GND pin sits at the negative output, so ON/OFF is referenced to that rail; shutdown from system logic needs level shifting, while tying ON/OFF to the device GND pin keeps the regulator ON · Unit: NONE
Conditions: Inverting Regulator Shutdown Methods; buck-mode rule 'pull below 1.3 V referenced to ground pin to turn ON' restated for the bootstrapped ground
Verdict: PASS - primary-source confirmed · Provenance: PRIMARY-SPEC
Fact: fact-lm2596-project-placements
Value: U2: +15V to +13.5V buck; U3: +15V to +7.5V buck; U4: +15V to -13.5V inverting buck-boost; all board-b, all fitted · Unit: NONE
Conditions: board-b netlist baseline placements of line-c347423
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Fact: fact-lm2596-u4-inverting-nets
Value: U4.3 (GND), U4.5 (ON/OFF), U4.6 (TAB) all tied to the -13.5V output rail; U4.1=+15V; U4.2 switches to D3/L3 with L3.2 on system GND; U4.4 is the FB divider tap; topology is inverting buck-boost, not SEPIC · Unit: NONE
Conditions: resolves the issue-46 topology label question at fact level: the schematic part and netlist are authoritative; ON/OFF at 0 V relative to the device GND pin = regulator ON
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Fact: fact-lm2596-u2-r1
Value: 10000 · Unit: ohm
Conditions: U2 feedback divider upper resistor R1, nominal value from the schematic
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Evidence: src-lm2596-schematic-dcdc: symbol instance property row R1 value 10k
Fact: fact-lm2596-u2-r2
Value: 1000 · Unit: ohm
Conditions: U2 feedback divider lower resistor R2, nominal value from the schematic
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Evidence: src-lm2596-schematic-dcdc: symbol instance property row R2 value 1k
Fact: fact-lm2596-u3-r3
Value: 5100 · Unit: ohm
Conditions: U3 feedback divider upper resistor R3, nominal value from the schematic
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Evidence: src-lm2596-schematic-dcdc: symbol instance property row R3 value 5.1k
Fact: fact-lm2596-u3-r4
Value: 1000 · Unit: ohm
Conditions: U3 feedback divider lower resistor R4, nominal value from the schematic
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Evidence: src-lm2596-schematic-dcdc: symbol instance property row R4 value 1k
Fact: fact-lm2596-u4-r5
Value: 10000 · Unit: ohm
Conditions: U4 feedback divider upper resistor R5, nominal value from the schematic
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Evidence: src-lm2596-schematic-dcdc: symbol instance property row R5 value 10k
Fact: fact-lm2596-u4-r6
Value: 1000 · Unit: ohm
Conditions: U4 feedback divider lower resistor R6, nominal value from the schematic
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Evidence: src-lm2596-schematic-dcdc: symbol instance property row R6 value 1k
Fact: fact-lm2596-vin-project
Value: 15 · Unit: V
Conditions: board A USB-PD 15 V contract feeding the board-b +15V rail into U2.1/U3.1/U4.1; nominal contract value, not a measured rail
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Evidence: src-lm2596-board-b-baseline: nets table row '+15V -> +13.5V gen' (U2.1, U3.1, U4.1)
Fact: fact-lm2596-u4-vout-target
Value: 13.5 · Unit: V
Conditions: magnitude of the U4 design rail target, -13.5 V (feeds the LM7912 -12 V LDO)
Verdict: NOT APPLICABLE · Provenance: PROJECT-CHOICE
Evidence: src-
Fact: fact-lm2596-u2-vout-setpoint
Value: 13.53 · Unit: V
Conditions: U2 nominal output setpoint from typical VFB and nominal R1/R2 (10k/1k) -> 13.53 V for the +13.5V rail; tolerance stack excluded; actual rail never measured (v4 never negotiated input power), bench measurement on board-b required
Verdict: NEEDS BENCH · Provenance: CALCULATED
Evidence: src-lm2596-umw-ds — CALCULATED: fact-lm2596-fb-vref times one plus R1/R2 ratio
Fact: fact-lm2596-u3-vout-setpoint
Value: 7.502999999999999 · Unit: V
Conditions: U3 nominal output setpoint from typical VFB and nominal R3/R4 (5.1k/1k) -> 7.503 V for the +7.5V rail; tolerance stack excluded; actual rail requires bench measurement
Verdict: NEEDS BENCH · Provenance: CALCULATED
Evidence: src-lm2596-umw-ds — CALCULATED: fact-lm2596-fb-vref times one plus R3/R4 ratio
Fact: fact-lm2596-u4-vout-setpoint-magnitude
Value: 13.53 · Unit: V
Conditions: magnitude of the U4 output setpoint from typical VFB and nominal R5/R6 (10k/1k); regulation acts between system GND (divider return) and the device GND pin riding at the negative output; actual rail requires bench measurement
Verdict: NEEDS BENCH · Provenance: CALCULATED
Evidence: src-lm2596-umw-ds — CALCULATED: fact-lm2596-fb-vref times one plus R5/R6 ratio
Fact: fact-lm2596-u4-vout-setpoint
Value: -13.53 · Unit: V
Conditions: U4 output setpoint mirrored below system ground: -13.53 V nominal for the -13.5V rail; actual rail requires bench measurement
Verdict: NEEDS BENCH · Provenance: CALCULATED
Evidence: src-lm2596-umw-ds — CALCULATED: negated fact-lm2596-u4-vout-setpoint-magnitude
Fact: fact-lm2596-u4-effective-input
Value: 28.5 · Unit: V
Conditions: U4 effective device input: VIN-pin-to-GND-pin differential in the inverting buck-boost configuration equals VIN + |VOUT| because the GND pin is bootstrapped to the negative output (datasheet Inverting Regulator section); 15 + 13.5 = 28.5 V on design targets; actual VBUS and rail need bench confirmation
Verdict: NEEDS BENCH · Provenance: CALCULATED
Evidence: src-lm2596-board-b-baseline — CALCULATED: fact-lm2596-vin-project plus fact-lm2596-u4-vout-target
Fact: fact-lm2596-u4-effective-input-setpoint
Value: 28.53 · Unit: V
Conditions: divider-nominal refinement of fact-lm2596-u4-effective-input: 15 + 13.53 = 28.53 V; still below both the 40 V operating maximum and the 45 V absolute maximum; bench confirmation required
Verdict: NEEDS BENCH · Provenance: CALCULATED
Evidence: src-lm2596-board-b-baseline — CALCULATED: fact-lm2596-vin-project plus fact-lm2596-u4-vout-setpoint-magnitude
Fact: fact-lm2596-u4-absmax-margin
Value: 16.5 · Unit: V
Conditions: headroom of the 45 V absolute-maximum supply rating over the 28.5 V effective input; positive 16.5 V margin, no deterministic violation; excludes input transients/ringing, which the board-b bench scope must cover
Verdict: NEEDS BENCH · Provenance: CALCULATED
Evidence: src-lm2596-umw-ds — CALCULATED: fact-lm2596-vin-absmax minus fact-lm2596-u4-effective-input
Fact: fact-lm2596-u4-operating-margin
Value: 11.5 · Unit: V
Conditions: headroom of the 40 V recommended operating maximum over the 28.5 V effective input; positive 11.5 V margin (11.47 V against the divider-nominal 28.53 V); bench confirmation required
Verdict: NEEDS BENCH · Provenance: CALCULATED
Evidence: src-lm2596-umw-ds — CALCULATED: fact-lm2596-vin-operating-max minus fact-lm2596-u4-effective-input
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: fact-lm2596-u2-vout-setpoint
Expression: fact_lm2596_fb_vref * (1 + fact_lm2596_u2_r1 / fact_lm2596_u2_r2)
Depends on:
Fact: fact-lm2596-u3-vout-setpoint
Expression: fact_lm2596_fb_vref * (1 + fact_lm2596_u3_r3 / fact_lm2596_u3_r4)
Depends on:
Fact: fact-lm2596-u4-vout-setpoint-magnitude
Expression: fact_lm2596_fb_vref * (1 + fact_lm2596_u4_r5 / fact_lm2596_u4_r6)
Depends on:
Fact: fact-lm2596-u4-vout-setpoint
Expression: -fact_lm2596_u4_vout_setpoint_magnitude
Depends on:
Fact: fact-lm2596-u4-effective-input
Expression: fact_lm2596_vin_project + fact_lm2596_u4_vout_target
Depends on:
Fact: fact-lm2596-u4-effective-input-setpoint
Expression: fact_lm2596_vin_project + fact_lm2596_u4_vout_setpoint_magnitude
Depends on:
Fact: fact-lm2596-u4-absmax-margin
Expression: fact_lm2596_vin_absmax - fact_lm2596_u4_effective_input
Depends on:
Fact: fact-lm2596-u4-operating-margin
Expression: fact_lm2596_vin_operating_max - fact_lm2596_u4_effective_input
Depends on:
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-lm2596s-adj
Symbol:
LM2596S-ADJFootprint:
TO-263-5_L10.2-W8.9-P1.70-BRPins: 6
Pin assignments
| Symbol pin | Name | Footprint pad | Function |
|---|---|---|---|
1 | VIN | 1 | input supply; +15V rail on U2/U3/U4 |
2 | Output | 2 | switching output; U4 drives the D3/L3 switch node |
3 | GND | 3 | device ground; system GND on U2/U3, -13.5V rail on U4 (inverting) |
4 | Feedback | 4 | output voltage feedback divider tap |
5 | ON/OFF | 5 | shutdown input, ON when low or floating; tied to the device GND node on all three placements |
6 | TAB | 6 | package tab, thermally specified only; project nets tie it to the device GND node (system GND on U2/U3, -13.5V rail on U4) |
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-lm2596-u4-inverting-stress
Records involved:
rec-lm2596s-adj-c347423(this record)Conditions: actual negotiated VBUS, inverting startup inrush against the current-limited USB-PD source, and switch-node ringing across the full load range
Verdict: NEEDS BENCH
Facts this rests on:
int-lm2596-rail-setpoints
Records involved:
rec-lm2596s-adj-c347423(this record)Conditions: divider tolerance stack, feedback reference spread over temperature, and downstream LDO dropout requirements on the +13.5/+7.5/-13.5 rails
Verdict: NEEDS BENCH
Facts this rests on:
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: NEEDS BENCH — 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-tvs-clamp-vs-absmax— tvs-clamp-vs-absmax — rule verdict: UNSOURCEDrule-u4-inverting-stress— u4-inverting-stress — rule verdict: NEEDS BENCHrule-ldo-dropout-chain— ldo-dropout-chain — rule verdict: UNSOURCEDrule-inverting-startup-vs-pd-source— inverting-startup-vs-pd-source — rule verdict: NEEDS BENCHrule-evidence-chain— source-to-bench-chain — rule verdict: UNSOURCED — How far each claim has travelled from a manufacturer document towards a measurement on real hardware, stage by stage.
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.
UMW LM2596/LM2596HV 3A Step-Down Voltage Regulator
Source ID: src-lm2596-umw-ds · Authority: MANUFACTURER_PRIMARY
| Field | Recorded value |
|---|---|
| Document number | not stated |
| Revision | Jun.2025 |
| Document date | 2025-06 |
| Retrieved | 2026-08-14 |
| Printed page | 4 of 28 |
Locator: Pin Descriptions and Ordering information tables (printed page 3); Absolute Maximum Ratings and Operating Conditions tables (printed page 4); Electrical Characteristics 10.1/10.2 tables (printed pages 5-7) with thermal notes 11-14 (printed page 8); Application Information Inverting Regulator sections (printed pages 20-23)
Availability: AVAILABLE
Document URL: https:
zudo-pd KiCad schematic, DC-DC conversion sheet
Source ID: src-lm2596-schematic-dcdc · Authority: PROJECT_GENERATOR
| Field | Recorded value |
|---|---|
| Document number | dc-dc-conversion.kicad_sch |
| Revision | 1e053e1ae1b943ac9539e0d5f79a180e4dceabe1 |
| Document date | 2026-07-05 |
| Retrieved | 2026-08-14 |
| Printed page | source file |
Locator: symbol instance property rows Reference/Value for U2/U3/U4 (LM2596S-ADJ) and R1=10k R2=1k R3=5.1k R4=1k R5=10k R6=1k
Availability: AVAILABLE
Document URL: https:
board-b netlist baseline (schgen)
Source ID: src-lm2596-board-b-baseline · Authority: PROJECT_GENERATOR
| Field | Recorded value |
|---|---|
| Document number | scripts/schgen/baselines/board-b.json |
| Revision | c89c1541fbd6315c9d41fd4f55737368ebcb7bbf |
| Document date | 2026-08-14 |
| Retrieved | 2026-08-14 |
| Printed page | source file |
Locator: nets table rows '+15V -> +13.5V gen', 'Net-(D1-K)', 'Net-(D2-K)', 'Net-(D3-K)', '/DC-DC Conversion/+13.5V OUT', '/DC-DC Conversion/+7.5V OUT', '/DC-DC Conversion/-13.5V OUT', 'Net-(U2-Feedback)', 'Net-(U3-Feedback)', 'Net-(U4-Feedback)', 'GND'
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. |
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. |
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 |
|---|---|
VERIFIED | The exact orderable part has been confirmed against a source. |
Source state
| Recorded term | What it means |
|---|---|
AVAILABLE | At least one document backing this line was 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.
No owning bundle is identified in the published model.