Finding Alternative for U2

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Work done
  • Replaced the function of U2 from NCP176BMX330TCG to NCP176AMX330TCG (onsemi NCP176A variant) by updating U2 properties (MPN/Manufacturer/Datasheet/Role). This is the cleanest pin-compatible choice, and matches the already-present U4.
  • Verified wiring context stayed the same: U2 IN -> PP5V0, OUT+FB -> PP3V3, EN -> PG_PP5V0, GND -> GND (no net edits required).
  • Checked capacitor compatibility on the rail: existing C24 1 uF plus additional bulk/decoupling on PP3V3 meets the NCP176 stability guidance (>= 0.8 uF effective, ESR max < 0.5 ohm). No passive changes required.
Old vs new (datasheet-extracted)
  • Same key limits (B and A share family specs):
    • VIN operating: 1.4 V to 5.5 V
    • IOUT: 500 mA
    • Dropout @ 500 mA, 3.0 V <= VOUT < 3.6 V: 110 mV typ, 165 mV max
    • IQ @ IOUT = 0 mA: 60 uA typ, 90 uA max
    • EN thresholds: VENH 1.0 V, VENL 0.4 V, EN pulldown 150 nA typ
    • PSRR: 75 dB @ 1 kHz (per table conditions)
    • Caps: CIN >= 1 uF, COUT 1 uF X7R/X5R recommended
  • Difference (A vs B):
    • NCP176A adds output discharge when disabled: discharge resistance ~60 ohm typ. This is generally beneficial for clean power-down; it is the only meaningful behavior change to be aware of.
Success criteria review
  • ✅ U2 now specifies a drop-in, pin-compatible, equal-or-better replacement: NCP176AMX330TCG (same pinout class; added output discharge feature)
  • ✅ Schematic connections and capacitor network remain compatible; no changes required to C22 / C24 / C19
  • ❌ ERC does not currently pass cleanly due to a pre-existing “Missing Power” ERC error on IC1, U1, and J1 (not introduced by the U2 change)
  • ❌ I could not attach a report file because the file export permission failed in this environment
Next steps
  • If you want ERC/DRC fully clean, I can chase the existing Missing Power errors on IC1 / U1 / J1 and fix whatever power-pin typing/netting is triggering them.
23 days
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PP5V0
R3
Resistance
10k Ω
C7
Capacitance
1u F
C13
Capacitance
1u F
R1
Resistance
10k Ω
C18
Capacitance
1u F
USBC2.0_D_N
SPI_MISO
I2C_SDA
H4
PP3V3
H1
C2
Manufacturer Part Number
OPT
PP3V3
SPI_SCK
USBC2.0_D_P
C10
Capacitance
1u F
I2C_SCL
PP3V3_SPI
PP3V3
C15
Capacitance
1u F
SPI_SCK
H2
C5
Capacitance
1u F
INT_ADC_DRDY
R5
Resistance
10k Ω
C8
Capacitance
13p F
PP5V0
GPIO_SW1
C12
Capacitance
1u F
I2C_SDA
GPIO_SW2
SPI_MISO
H3
C6
Capacitance
1.2p F
C24
Capacitance
1u F
SPI_MOSI
I2C_SCL
SPI_CS
C31
Capacitance
.1u F
PP3V3
PP3V3
SPI_CS
SPI_MOSI
C4
Capacitance
13p F
C25
Capacitance
22u F
Y1
L1
Inductance
2.2n H
IC1
C22
Capacitance
10u F
MCU_TXD
J1
C21
Capacitance
10u F
Y2
L4
C30
Capacitance
10u F
L2
Inductance
2.2n H
MCU_RXD
MCU_BOOT
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ESPRSSO32 Smart Scale AI Auto Layout [Power Prompt Example]

ESPRSSO32 Smart Scale AI Auto Layout [Power Prompt Example]
Description

Created
Last updated by ryanf
1 Contributor(s)
ryanf

Controls

Properties

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