Update PCB Stackup to 2 Layers

flux

Yes, Senhor Vasquez — it is possible, but you need two resistors and must break the existing direct FB-to-3.3 V connection. Adding only one resistor will not fix it.
For the adjustable TPS62827:
VOUT=0.6 V(1+RTOPRBOTTOM)V_{OUT}=0.6\text{ V}\left(1+\frac{R_{TOP}}{R_{BOTTOM}}\right)
A suitable 1% resistor pair is:
  • R_TOP = 453 kΩ: output to FB
  • R_BOTTOM = 100 kΩ: FB to GND
This produces approximately:
0.6(1+453/100)=3.318 V0.6(1+453/100)=3.318\text{ V}
That is suitable for a nominal 3.3 V rail.
Required modification 
Text
3.3 V output ── 453 kΩ ──┐
                          ├── TPS62827 FB
GND ────────── 100 kΩ ───┘
Procedure:
  1. Completely disconnect USB and the LiPo.
  2. Locate the PCB trace directly connecting U6 FB pin 3 to the 3.3 V output.
  3. Carefully cut that trace and confirm with a multimeter that FB is no longer shorted to the output.
  4. Solder 453 kΩ between the 3.3 V output and FB.
  5. Solder 100 kΩ between FB and GND.
  6. Keep both resistors and wires extremely close to U6; FB is sensitive to switching noise.
  7. Check for shorts under magnification.
  8. Initially power the board from a current-limited bench supply or USB current limiter, without the battery.
  9. Measure the output before allowing the ESP32-S3 and other loads to run. Expect approximately 3.3 V.
Important cautions
  • U6 is a tiny 1.5 mm VSON package, so soldering directly to FB pin 3 is difficult.
  • If the FB trace cannot be isolated cleanly, replacing the IC with TPS6282533DMQR may be safer.
  • Do not power the board until the modification is complete. With FB directly connected to the output, the adjustable part will attempt to regulate near 0.6 V, not 3.3 V.
  • Use 1% resistors. Avoid long jumper wires around the SW pin and inductor because those carry noisy switching signals.
Document and check mod
Show solder points
Calculate resistor options
Create rework guide
Check replacement option
SW8
SW10
SW9
SW7
SW12
SW6
SW11
U6 SW - L2 P1
U5 BAT - C2 P1
U5 ISET - R13 P1
U5 IN - C1 P1
U5 ~{PGOOD} - R15 P1
U6 EN - C14 P1
U5 ~{CHG} - R16 P1
SW10 1 - SW10 2
L1 P2 - U4 FB
U5 BAT - C2 P1
SW8 3 - SW8 4
SW3 3 - SW3 4
L1 P2 - U4 FB
U5 TMR - R18 P1
SW4 3 - SW4 4
U5 OUT - U6 VIN
SW10 1 - SW10 2
SW8 1 - SW8 2
U5 ISET - R13 P1
SW3 3 - SW3 4
U5 TS - R17 P1
U6 EN - C14 P1
SW8 3 - SW8 4
U5 ~{PGOOD} - R15 P1
U5 OUT - U6 VIN
U5 IN - C1 P1
U5 IN - C1 P1
SW5 1 - SW5 2
U6 SW - L2 P1
U6 EN - C14 P1
SW8 1 - SW8 2
U5 ILIM - R14 P1
U5 IN - C1 P1
U5 TS - R17 P1
SW4 3 - SW4 4
U5 ~{CHG} - R16 P1
SW4 3 - SW4 4
SW8 1 - SW8 2
L1 P2 - U4 FB
SW10 1 - SW10 2
U5 TMR - R18 P1
L1 P2 - U4 FB
U5 ILIM - R14 P1
R15
Resistance
100kohm Ω
R17
Resistance
10kohm Ω
R14 P2 - R17 P2
R13
Resistance
1.8kohm Ω
D2 2 - C1 P2
D2 2 - C1 P2
R14 P2 - R17 P2
D2 2 - C1 P2
D2 2 - C1 P2
R16
Resistance
100kohm Ω
R14
Resistance
1.6kohm Ω
GND
D2 2 - C1 P2
C15 P2 - C22 P2
R14 P2 - R17 P2
D2 2 - C1 P2
R18
Resistance
18kohm Ω
R20 P2 - R13 P2
D2 2 - C1 P2
U5
C24
Capacitance
0.1uF
L2
Inductance
470nH
U6
C2
Capacitance
10uF
C1
Capacitance
10uF
C18
Capacitance
0.1uF
C14
Capacitance
4.7uF
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Tamagochi

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