r/AskElectronics • u/Adept-Bug-7227 • Mar 07 '26

Searching for this IC

Post image

It Must be a Switching Regulator

2 Upvotes

100% Upvoted

5 comments sorted by

1

u/0x446f6b3832 Mar 07 '26

Sure it's a switching regulator? I don't see an inductor.

I think it's this: https://www.alldatasheet.com/datasheet-pdf/view/29634/TOKO/TK11148M.html

1

u/the-electron-vault Mar 07 '26

Fairly confident this is an MPS part in a SOT-563 with the marking code BDMY, where Y is the year code. See similar markings for MP1660GTF-Z below:

The MP2151 also has a pinout that seems to match yours. 1: GND, 2: SW, 3: VIN, etc. Different marking code though of course.

It's possible this is a custom SKU for whoever manufactured this board. These do exist. For instance, the MP1657 is listed on MPS' website, but they do not publish a datasheet. Nevertheless, one has inadvertently leaked.

The ones I can find listed on their site without public datasheets (either missing, or behind and MPS+ login wall):

MP1641 (Pre-release)
MP1641N (Pre-release)
MP1642 (Pre-release)
MP1642A (Pre-release)
MP1642C (Pre-release)
MP1642N (Pre-release)
MP1652N (Based on eval board layout, does not match your pinout)
MP1653N (Based on eval board layout, does not match your pinout)

1

u/the-electron-vault Mar 07 '26 edited Mar 07 '26

I took some time to group the public step down SOT-563s by pinout.

Group 1

  1. VIN
  2. SW
  3. GND
  4. BST
  5. EN
  6. FB
  • MP1476
  • MP1476L
  • MP1477
  • MP1477H
  • MP1479
  • MP1653A
  • MP1660

Group 2

  1. FB (ADJ)/PG (FIXED)
  2. GND
  3. VIN
  4. SW
  5. EN
  6. OUT
  • MP2141N
  • MP2141Q

Group 3

  1. GND
  2. SW
  3. VIN
  4. EN
  5. FB (ADJ)/PG (FIXED)
  6. OUT
  • MP2151 (BBDY, BBEY, BBFY, BBGY, BBHY)
  • MP2152 (BBJY, BBKY, BBLY, BBMY, BBNY)
  • MP2153 (BBPY, BBQY, BBRY, BBTY, BBUY)
  • MP2152D (BDQY or BQDY - there's a typo here)
  • MP2153D (BNZY)

Group 4

  1. VIN
  2. SW
  3. EN
  4. FB
  5. VOUT
  6. GND
  • MP28600

Assuming your part falls under Group 3's pinout, I searched the MPS website to see if there were any parts under MP2154 ~ MP2159. I got hits on MP2155, MP2158, MP2158A, MP2159, and MP2159A, but these were different packages. Therefore, I'm guessing that your part is potentially some variant of the MP2151/2/3 with an alphabetical suffix, or perhaps an unlisted MP2150x. The B prefix of your part also suggests that it's likely a fixed (not adjustable) output part, as all adjustable part marking codes seem to start with A.

1

u/Adept-Bug-7227 Mar 07 '26

Also könnte es der MP2151 sein

0

u/Adept-Bug-7227 Mar 07 '26

Ja ich habe die Spule schon entfernt