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.
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J1
Datasheet URL
[object Object]
J2
J3
SW5
SW8
SW10
SW4
SW3
SW9
SW17
SW7
SW16
SW12
SW13
SW15
SW18
SW6
SW14
SW11
U6 SW - L2 P1
SW10 1 - SW10 2
SW8 1 - SW8 2
L1 P2 - U4 FB
SW8 3 - SW8 4
U5 IN - C1 P1
J1 CC1 - D1 I/O3
U5 BAT - C2 P1
SW3 3 - SW3 4
U5 ISET - R13 P1
L1 P2 - U4 FB
U5 IN - C1 P1
SW13 1 - SW13 2
U1 GPIO0 - R2 P2
SW3 3 - SW3 4
U5 IN - C1 P1
L1 P2 - U4 FB
J2 CD/DAT3(~CS~) - R7 P2
L1 P2 - U4 FB
U5 ~{PGOOD} - R15 P1
U6 EN - C14 P1
SW3 3 - SW3 4
U1 MTDI - R12 P1
L1 P2 - U4 FB
SW8 1 - SW8 2
U1 CHIP_PU - R1 P2
L1 P2 - U4 FB
U5 IN - C1 P1
U5 ~{CHG} - R16 P1
SW8 3 - SW8 4
SW10 1 - SW10 2
R8 P2 - J3 3
J1 DN1 - J1 DN2
SW4 3 - SW4 4
L1 P2 - U4 FB
U5 BAT - C2 P1
Net 1
U1 GPIO37 - R9 P1
L1 P2 - U4 FB
SW3 1 - SW3 2
MIC1 SCK - U1 IO1
SW16 1 - SW16 2
J1 CC2 - D1 I/O4
SW13 1 - SW13 2
SW13 1 - SW13 2
R10 P2 - J3 5
SW8 1 - SW8 2
SW5 1 - SW5 2
SW3 3 - SW3 4
U1 MTDO - J2 DAT0(DO)
SW8 3 - SW8 4
J2 CD/DAT3(~CS~) - R7 P2
SW3 3 - SW3 4
SW5 1 - SW5 2
SW8 3 - SW8 4
SW3 3 - SW3 4
SW3 3 - SW3 4
SW16 1 - SW16 2
L1 P2 - U4 FB
SW4 3 - SW4 4
J1 CC2 - D1 I/O4
J1 DN1 - J1 DN2
L1 P2 - U4 FB
U1 MTCK - J2 CLK(SCK)
SW4 3 - SW4 4
SW8 3 - SW8 4
SW8 1 - SW8 2
U1 CHIP_PU - R1 P2
SW16 1 - SW16 2
SW5 1 - SW5 2
U5 TMR - R18 P1
SW5 1 - SW5 2
Net 2
SW4 3 - SW4 4
SW3 3 - SW3 4
U1 U0TXD - TP7
U1 U0RXD - TP8
J1 CC1 - D1 I/O3
MIC1 SCK - U1 IO1
SW8 3 - SW8 4
U5 OUT - U6 VIN
U1 GPIO0 - R2 P2
U5 IN - C1 P1
SW10 1 - SW10 2
R8 P2 - J3 3
R9 P2 - J3 4
U1 GPIO33 - J4 11
J1 CC1 - D1 I/O3
U5 BAT - C2 P1
U1 GPIO21 - R8 P1
SW3 1 - SW3 2
U1 GPIO37 - R9 P1
U1 CHIP_PU - R1 P2
SW8 1 - SW8 2
L1 P2 - U4 FB
U5 ISET - R13 P1
SW4 3 - SW4 4
SW3 3 - SW3 4
U5 TS - R17 P1
U1 MTMS - J3 8
SW5 1 - SW5 2
U1 GPIO38 - J2 CMD(DI)
SW3 1 - SW3 2
U1 MTMS - J3 8
U6 EN - C14 P1
U1 GPIO14 - J4 10
SW8 3 - SW8 4
U5 ~{PGOOD} - R15 P1
SW10 1 - SW10 2
U1 GPIO17 - R11 P1
R12 P2 - J3 7
SW16 1 - SW16 2
J1 CC2 - D1 I/O4
U1 CHIP_PU - R1 P2
U1 GPIO34 - J4 12
SW8 3 - SW8 4
U5 OUT - U6 VIN
U1 GPIO33 - J4 11
U5 IN - C1 P1
U5 IN - C1 P1
U1 GPIO45 - R10 P1
SW4 3 - SW4 4
SW5 1 - SW5 2
U6 SW - L2 P1
U6 EN - C14 P1
SW10 1 - SW10 2
U1 GPIO21 - R8 P1
SW8 1 - SW8 2
SW4 3 - SW4 4
SW13 1 - SW13 2
U5 ILIM - R14 P1
U5 IN - C1 P1
U1 GPIO38 - J2 CMD(DI)
SW8 3 - SW8 4
SW16 1 - SW16 2
U1 MTDI - R12 P1
SW3 1 - SW3 2
MIC1 SD - U1 IO3
L1 P2 - U4 FB
U1 GPIO14 - J4 10
R11 P2 - J3 6
U1 GPIO34 - J4 12
L1 P2 - U4 FB
L1 P2 - U4 FB
J1 DP1 - J1 DP2
SW4 3 - SW4 4
SW3 1 - SW3 2
U5 TS - R17 P1
U1 GPIO0 - R2 P2
SW4 3 - SW4 4
J1 DN1 - J1 DN2
SW4 3 - SW4 4
U1 GPIO38 - J2 CMD(DI)
SW13 1 - SW13 2
SW3 3 - SW3 4
SW3 3 - SW3 4
U5 ~{CHG} - R16 P1
SW16 1 - SW16 2
R10 P2 - J3 5
U1 MTDO - J2 DAT0(DO)
J1 DN1 - J1 DN2
SW13 1 - SW13 2
U1 CHIP_PU - R1 P2
SW8 3 - SW8 4
U1 GPIO0 - R2 P2
SW4 3 - SW4 4
U1 GPIO45 - R10 P1
SW8 1 - SW8 2
U1 MTDO - J2 DAT0(DO)
L1 P2 - U4 FB
U1 MTCK - J2 CLK(SCK)
J1 DP1 - J1 DP2
SW3 3 - SW3 4
J1 DP1 - J1 DP2
R9 P2 - J3 4
SW3 3 - SW3 4
L1 P2 - U4 FB
SW13 1 - SW13 2
SW10 1 - SW10 2
SW4 3 - SW4 4
MIC1 SD - U1 IO3
J1 DP1 - J1 DP2
R12 P2 - J3 7
R11 P2 - J3 6
U5 TMR - R18 P1
U1 GPIO17 - R11 P1
SW16 1 - SW16 2
SW10 1 - SW10 2
SW3 1 - SW3 2
L1 P2 - U4 FB
L1 P2 - U4 FB
U5 ILIM - R14 P1
SW4 3 - SW4 4
J1 SHIELD - D1 GND
J4 MP2 - SW1 3
J4 MP2 - SW1 3
J4 MP2 - SW1 3
GND
R14 P2 - R17 P2
J2_NEW VSS - J2_NEW 9
J2_NEW VSS - J2_NEW 9
U1 GND - U1 GND
J1 SHIELD - D1 GND
U1 GND - U1 GND
SW1 3 - SW1 4
D2 2 - C1 P2
J2_NEW VSS - J2_NEW 9
J2_NEW VSS - J2_NEW 9
J4 MP2 - SW1 3
GND
D2 2 - C1 P2
R14 P2 - R17 P2
J2_NEW VSS - J2_NEW 9
D2 2 - C1 P2
J3 1 - J3 9
J1 GND_A - J1 GND_B
D2 2 - C1 P2
J2_NEW VSS - J2_NEW 9
J1 SHIELD - D1 GND
SW1 3 - SW1 4
J1 GND_A - J1 GND_B
SW1 3 - SW1 4
SW1 3 - SW1 4
J4 MP2 - SW1 3
GND
C15 P2 - C22 P2
D2 2 - C1 P2
C15 P2 - C22 P2
J3 1 - J3 9
R14 P2 - R17 P2
D2 2 - C1 P2
J1 GND_A - J1 GND_B
MK1_NEW GROUND - C_MK1 P2
D2 2 - C1 P2
J1 GND_A - J1 GND_B
J2_NEW VSS - J2_NEW 9
R20 P2 - R13 P2
MK1_NEW GROUND - C_MK1 P2
D2 2 - C1 P2
C15 P2 - C22 P2
J1 SHIELD - D1 GND
R15
Resistance
100kohm Ω
R9
Resistance
22 ohm
R17
Resistance
10kohm Ω
R2
Resistance
10kohm
C8
Capacitance
0.1 uF
C6
Capacitance
10 uF
U5
C24
Capacitance
0.1uF
C3
Capacitance
1.0 uF
R13
Resistance
1.8kohm Ω
C22
Capacitance
0.1uF
C_MK1
Capacitance
0.1uF
R16
Resistance
100kohm Ω
R6
Resistance
47kohm
R14
Resistance
1.6kohm Ω
R1
Resistance
10kohm
R4
Resistance
5.1kohm
R5
Resistance
47kohm
C2
Capacitance
10uF
R18
Resistance
18kohm Ω
C1
Capacitance
10uF
R12
Resistance
22 ohm
R3
Resistance
5.1kohm
R10
Resistance
22 ohm
R8
Resistance
22 ohm
C18
Capacitance
0.1uF
R11
Resistance
22 ohm
C15
Capacitance
22uF
R7
Resistance
47kohm
C14
Capacitance
4.7uF
L2
Inductance
470nH
5WAY
D1
SW2
U6
MK1
D2
U1
SW1
J5
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Tamagochi

Welcome to your new project. Imagine what you can build here.

Layout Rules

mm

Yes

10mm

Top

deg

Properties

Properties describe core aspects of the project.

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