Does anyone know what this "burnt out" black 7201 chip on the right is? It looks like it could be a VF/RF amplifier for a PA (Power Amplifier XP TX1 and XP TX2) in an MSOP-10 package. Input on pin 8, ground on pins 6, 7, and 9, 10.
Sure—based on the layout (MSOP-10 package, serial shunt "E22" ≈0.22 Ω between the chip and the XP-TX block, bead + noise suppression C), it fits much better on the hot-swap/eFuse/power-limit circuit that powers the PA branch (5 V/5.2 V rail) than on the RF amplifier. Three suitable candidates in MSOP-10:
TI TPS2491 (MSOP-10) – Positive high-voltage hot-swap with adjustable current/power limit, SOA protection, and external sense resistor (exactly as shown in the photo). Input 2.5–18 V, controlled ramp-up, PG/FAULT. Datasheet
ADI (Linear) LTC4211 (MSOP-10) – 2.5–16.5 V hot-swap controller with electronic circuit breaker, external N-MOSFET, and sensing resistor; typical connection: VIN → bead → LTC4211 → Rsense → load (PA), lots of bypass C at the output. Datasheet
ADI (Linear) LTC4216 (MSOP-10) – Low-voltage hot-swap 0–6 V with adjustable soft-start, fast overload protection, and 25 mV threshold drop on the sense resistor; often used on 5V branches to PA. Datasheet
Why it fits your picture
MSOP-10 package: all three.
Serial shunt "E22" between chip and XP-TX = PA current measurement/limitation → typical for TPS2491/LTC4211/LTC4216.
Bead (blue) + C at the input = EMI/interference suppression of the 5V rail before hot-swap.
GCPW is at the PA output, not at "7201" → "7201" is not in the RF path, but in the power supply path.
Note: These circuits do not set exactly 5.2 V (which is the rail value/branch designation), but control/protect the PA power supply (inrush, current limit, SOA), which corresponds exactly to what you see on the board.
Maybe it is QFN-20 package e.g. Maxscend MXD7201 ?
Type: Power controller for RF PA modules
Package: QFN-20 (3×3 mm) without EP
Functions: IN, OUT (via Rsense), EN, PG/POK outputs for sequencing
Application: often used in smartphone TX branches (2× PA bias, as in your XP-TX1/2)
Note: There is practically no public datasheet, but it appears in Chinese forums as PA电源管理芯片.
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