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RVG sensor board

I need some help correctly identifying the U9 and U10 components on the PCB. I've tried some codebooks and I found several options.

For U9:

H1 - X6603 is a 300mA, low quiescent, high PSRR, low noise and low dropout linear regulator, but the model marked with "Lv" is a 4.7V and this board is a 3.3V

H2 - Toshiba 200 mA CMOS Low Drop-Out Regulator with Fast Load Transient Response TCR2EF series, but Pin 4 is connected to capacitor C46 and it should be NC...

For U10:

H1 - "4FD" - in the 2011 edition of the active smd components guide, it's a FT521FDa, LDO, Dual out, Vout1/Vout2=2.7V/1.8V±2%, 250mA, +CE, but again it should be 3.3V (4FJ).

Any help? Thanks.

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Your U10 is a Microchip 24FC256 - spot the logo in the pin-4 corner?

I suspect that your U9 might be a Linear technology LTC1663.
The pin connections for VCC(pin-4) and GND(pin-2) are almost certainly correct, making C46 its decoupling cap.

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  • \$\begingroup\$ Yes, you're right, measurements match! Thanks a lot! \$\endgroup\$ – Alex May 7 at 2:38
  • \$\begingroup\$ Yes, you are absolutly right, sometimes we miss out the obvious... Thank you very much for your effort and support. \$\endgroup\$ – Alex May 9 at 11:33

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