77645-21 Mobile Phone IC
Performance Optimized for Mobile Devices
The 77645-21 Mobile Phone IC is engineered to deliver exceptional performance, ensuring seamless operation for your mobile devices. It is designed with precision to maintain efficiency and reliability, making it an ideal solution for modern smartphones and electronic devices. 77645-21 Mobile Phone IC
Compact Design with Maximum Efficiency
This IC boasts a space-saving design that supports streamlined integration into compact devices. The advanced technology behind its design ensures low power consumption without compromising on processing capabilities, perfect for high-demand applications. 77645-21 Mobile Phone IC
Highly Reliable and Durable
Built for longevity, the 77645-21 Mobile Phone IC ensures constant stability and consistent performance under varying conditions. It meets rigorous quality standards, making it a trusted component in the fast-paced world of mobile technology. 77645-21 Mobile Phone IC
The SKY77645-21, part of the SkyLiTE™ family by Skyworks Solutions, is a highly integrated Multimode Multiband (MMMB) Power Amplifier Module (PAM). Designed specifically for 3G and 4G (LTE) mobile handsets, it serves as the critical “muscle” of the radio frequency (RF) front end, amplifying signals for transmission while maintaining high efficiency to preserve battery life. 77645-21 Mobile Phone IC
Below are the comprehensive technical specifications and operational details for the 77645-21 IC.
Technical Specifications Table
| Feature | Specification Details |
| Manufacturer | Skyworks Solutions, Inc. |
| Part Number | SKY77645-21 |
| Device Category | Multimode Multiband Power Amplifier Module (MMMB PAM) |
| Supported Modes | CDMA, WCDMA, TD-SCDMA, FDD-LTE, TDD-LTE |
| Interface Control | MIPI® RFFE (Mobile Industry Processor Interface) |
| Input/Output Impedance | Internally matched to 50 $\Omega$ |
| Supply Voltage ($V_{CC}$) | Typically 3.0V to 4.6V (Adjustable via DC-DC Converter) |
| Operating Frequency | Multiband (Low, Mid, and High Band support) |
| Package Type | 42-pad MCM (Multi-Chip Module) |
| Dimensions | 4.0 mm x 6.8 mm x 0.75 mm |
| Operating Temp | -30°C to +85°C (Standard Industrial/Mobile range) |
Detailed Frequency Band Support
The 77645-21 is engineered to support a global array of frequency bands, making it a “world-phone” component.
1. 3G / WCDMA & TD-SCDMA Bands
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WCDMA Bands: I, II, III, IV, V, VIII, IX
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TD-SCDMA Bands: 34, 39
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CDMA Bands: BC0, BC1, BC4, BC6, BC10, BC15
2. 4G / LTE Bands
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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
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Carrier Aggregation: Supports Uplink CA for Band 39 (up to 35 MHz) and Bands 40/41 (up to 40 MHz).
Key Functional Features
Power Management and Efficiency
One of the standout features of the SKY77645-21 is its optimization for Average Power Tracking (APT). By working in tandem with an external DC-DC converter, the IC adjusts its supply voltage ($V_{CC}$) based on the required output power. This prevents energy waste during low-power transmissions, significantly extending the smartphone’s battery life.
Integrated Architecture
The module includes:
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WCDMA/LTE Blocks: Separate paths for Low, Mid, and High frequency bands to ensure signal purity.
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Multi-Function Control (MFC): A CMOS-based block that handles the logic and MIPI interface.
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Internal Matching: All RF ports are matched to 50 $\Omega$, which eliminates the need for bulky external capacitors and inductors, saving valuable PCB space.
MIPI® RFFE Control
The IC utilizes the MIPI RFFE (Radio Frequency Front End) serial interface. This allows the phone’s primary processor (Modem) to send high-speed commands to the PA to switch bands, adjust bias, or enter low-power modes within microseconds.
Physical and Mechanical Data
The SKY77645-21 uses a Multi-Chip Module (MCM) design, where the InGaP (Indium Gallium Phosphide) amplifier die and the Silicon control die are mounted on a single laminate substrate.
| Parameter | Value |
| Package Layout | 42-pad Land Grid Array (LGA) |
| Thickness | 0.75 mm (Ultra-thin for modern slim phones) |
| Moisture Sensitivity | MSL3 (Standard for reflow soldering) |
| Lead Finish | NiPdAu (Gold-based for high reliability) |
Application and Usage Note
This IC is commonly found in flagship and mid-range devices from 2018–2022, including certain models of the Samsung Galaxy series and Xiaomi devices. When repairing or replacing this chip, technicians must use a high-precision hot air rework station. Because of the 42-pad configuration, ensuring perfect alignment with the PCB’s fiducial marks is essential to avoid “shorts” between the small solder balls.
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