77645-11 Original Mobile Phone IC
Reliable and Efficient Design
The 77645-11 Original Mobile Phone IC is engineered to deliver optimal performance and reliability for your smartphone. Built with cutting-edge technology, this IC ensures seamless functionality of critical mobile components, making it an essential part for quality repairs and manufacturing. 77645-11 Original Mobile Phone IC
Top-Quality Original Component
Manufactured to meet industry standards, the 77645-11 IC is an original component crafted for durability and precision. Whether you’re a technician, a reseller, or a DIY enthusiast, this IC guarantees compatibility and performance for a wide range of mobile devices. 77645-11 Original Mobile Phone IC
Perfect for Repairs and Upgrades
This mobile phone IC is perfect for repairing damaged circuits or upgrading your current system for enhanced efficiency. Its compact design and high-performance capability make it an excellent choice for professionals and hobbyists alike. 77645-11 Original Mobile Phone IC
The 77645-11 (specifically the SKY77645-11) is a high-performance Multimode Multiband (MMMB) Power Amplifier Module (PAM) developed by Skyworks Solutions. Part of the SkyLiTE™ family, this IC is a critical component in the RF (Radio Frequency) front-end of 3G and 4G LTE smartphones. It serves as the “voice” of the phone, amplifying weak signals from the transceiver to the power levels required for transmission to cellular towers. 77645-11 Original Mobile Phone IC
Technical Specifications Table
| Feature | Specification |
| Manufacturer | Skyworks Solutions, Inc. |
| Part Number | SKY77645-11 |
| Function | Multimode Multiband Power Amplifier Module (PAM) |
| Supported Standards | CDMA, WCDMA, TD-SCDMA, FDD-LTE, TDD-LTE |
| Frequency Range | 700 MHz to 2.6 GHz |
| Output Ports | 10 Outputs |
| Input Ports | 2 T/R (Receive) Ports |
| Control Interface | MIPI® RFFE (Mobile Industry Processor Interface) |
| Supply Voltage ($V_{CC}$) | 2.8V to 3.3V (Optimized for APT DCDC operation) |
| Package Type | 42-pad MCM (Multi-Chip Module) |
| Physical Dimensions | 4.0 mm x 6.8 mm x 0.75 mm |
| Material Technology | InGaP (Indium Gallium Phosphide) Die & Silicon |
Core Functional Overview
The 77645-11 is designed to reduce the “footprint” on a mobile phone’s Printed Circuit Board (PCB). By integrating multiple frequency bands into a single 42-pad module, it allows manufacturers like Xiaomi (notably the Mi 5C) and Samsung to create slimmer devices without sacrificing global roaming capabilities.
1. Multimode Support
This IC is “multimode,” meaning it can handle different types of cellular modulation. It supports:
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3G Technologies: WCDMA, HSDPA, HSUPA, and HSPA+. 77645-11 Original Mobile Phone IC
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4G Technologies: FDD-LTE and TDD-LTE, including support for Uplink Carrier Aggregation (CA). 77645-11 Original Mobile Phone IC
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Legacy/Specific Modes: CDMA2000 and TD-SCDMA (common in Asian markets). 77645-11 Original Mobile Phone IC
2. Efficiency and Power Management
The module is optimized for Average Power Tracking (APT). In a mobile device, the Power Management IC (PMIC) adjusts the voltage supplied to the 77645-11 based on how much power the phone actually needs to transmit. By keeping $V_{CC}$ low when signal strength is good, the IC significantly reduces heat and extends battery life.
3. MIPI® RFFE Control
Rather than using dozens of individual wires to tell the IC which band to use, it uses a digital serial bus called MIPI RFFE. This allows the phone’s processor to program the amplifier’s bias modes and gain settings instantly, ensuring the best balance between signal linearity and power efficiency.
Frequency Band Coverage
The SKY77645-11 is a “world-phone” chip, covering a vast array of global bands:
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WCDMA Bands: I, II, III, IV, V, VIII, IX
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FDD-LTE Bands: 1, 2, 3, 4, 5, 7, 8, 9, 12, 13, 17, 20, 25, 26, 28, 30
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TDD-LTE Bands: 38, 39, 40, 41
Repair and Identification
In the mobile repair industry, the 77645-11 is often identified as the “PA IC” or “Signal IC.” If a phone shows “No Service” or has an extremely weak signal despite having a valid SIM card, this chip is frequently the culprit.
Note for Technicians: When replacing this IC, professional BGA (Ball Grid Array) soldering tools are required. Because the package is an MCM (Multi-Chip Module) measuring only 4.0 x 6.8 mm, it is highly sensitive to overheating. Using a stencil for “reballing” is recommended to ensure all 42 pads make a solid connection with the PCB.
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