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AP1538SG-13

Public Made by Adom

by adom

Diodes Incorporated DC-DC Converters, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs ap1538sg-13: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
ap1538sg-13-etched.fit.json ap1538sg-13: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
ap1538sg-13-etched.glb ap1538sg-13: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
ap1538sg-13-etched.step ap1538sg-13: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
ap1538sg-13.glb Publish 0.1.0 · Ray
ap1538sg-13.kicad_mod Publish 0.1.0 · Ray
ap1538sg-13.kicad_sym Publish 0.1.0 · Ray
ap1538sg-13.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
ap1538sg-13.step Publish 0.1.0 · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json ap1538sg-13: specified limits as data (metadata.characteristics, 20 rows from the datasheet) · Ray
README.md ap1538sg-13: specified limits as data (metadata.characteristics, 20 rows from the datasheet) · Ray

AP1538SG-13

Diodes Incorporated · DC-DC Converters · SOIC-8

AP1538SG-13 from Diodes Incorporated, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 FB input Feedback pin. Connect to the resistor divider from VOUT to set the regulated output voltage using VOUT = VFB x (1 + RA/RB), with VFB typically 0.8V.
2 EN input Enable (power-off) pin. Drive High (>=2.0V) for normal step-down operation; drive Low (<=0.8V) to stop step-down operation and deactivate all internal circuits.
3 OCSET input Over-current set pin. Connect an external resistor (typically ~3kΩ) to set the maximum output current limit; internal bias current ~90µA.
4 VCC power_in IC power supply input. Operating range 3.6V to 18V; bypass locally with a decoupling capacitor (0.1µF typ) plus bulk input cap (e.g. 470µF).
5 Output output Switch node output (drain of the internal P-channel power MOSFET). Connect the external inductor and freewheel Schottky diode here; minimize trace area to reduce EMI. Pin 5 is tied internally to pin 6.
6 Output output Switch node output (drain of the internal P-channel power MOSFET). Connect the external inductor and freewheel Schottky diode here; minimize trace area to reduce EMI. Pin 6 is tied internally to pin 5.
7 Vss power_in Ground return. Pin 7 is tied internally to pin 8 and should be connected to the system ground plane.
8 Vss power_in Ground return. Pin 8 is tied internally to pin 7 and should be connected to the system ground plane.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOIC-8
Category PMIC
Pins 8

Ordering variants

  • AP1538SG-13
  • AP1538SG-13SDPG-13

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Feedback Voltage VFB 0.784 0.8 0.816 V IOUT = 0.1A 4
Feedback Bias Current IFB 0.1 0.5 µA IOUT = 0.1A 4
Line Regulation ΔVOUT/ΔVIN 1 2 % VIN = 5V~18V 4
Load Regulation ΔVOUT/VOUT 0.2 0.5 % IOUT = 0.1 to 3A 4
Oscillation Frequency fOSC 240 300 400 KHz Measure waveform at SW pin 4
EN Pin Input Voltage (high) VIH 2 V Evaluate oscillation at SW pin 4
EN Pin Input Voltage (low) VIL 0.8 V Evaluate oscillation stop at SW pin 4
OCSET Pin Bias Current IOCSET 75 90 105 µA 4
Input Voltage VIN 3.6 18 V Note 5 3
Output Current IOUT 0 3 A 3
Operating Ambient Temperature TA -20 85 °C 3
Human Body Model ESD Protection ESD HBM 5.5 KV 3
Machine Model ESD Protection ESD MM 200 V 3
VCC Pin Voltage VCC -0.3 20 V Relative to VSS (printed as VSS - 0.3 to VSS + 20) 3
Feedback Pin Voltage VFB -0.3 V Relative to VSS; upper limit printed as VCC 3
EN Pin Voltage VEN -0.3 V Relative to VSS; upper limit printed as VCC 3
Switch Pin Voltage VOUT -0.3 V Relative to VSS; upper limit printed as VCC 3
Operating Junction Temperature Range TJ -40 125 °C 3
Storage Temperature Range TST -65 150 °C 3
Thermal Resistance Junction-to-Case, SOP-8L θJC 24 °C/W Note 6: 2oz copper, minimum recommended pad layout top & bottom, thermal vias, double-sided FR-4 PCB 4

CAD (KiCad official)

  • Symbol: AP1538SG-13
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: ap1538sg-13-etched.step / ap1538sg-13-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ap1538sg-13.step / ap1538sg-13.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ap1538sg-13.step 122 KB You want the bare part, or you mark your own boards.
ap1538sg-13-etched.step 2.5 MB You want the part with AP1538SG-13 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 598 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (12 pp, sha256 638a3ccf88cbfdca, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF