77645-11 Mobile Phone IC
The 77645-11 Mobile Phone IC (specifically the Skyworks SKY77645-11) is a high-performance SkyLiTE™ Multimode Multiband (MMMB) Power Amplifier Module (PAM). It is a critical component in modern mobile devices, serving as the Radio Frequency (RF) front-end that enables seamless switching and signal boosting across 3G and 4G LTE networks. 77645-11 Mobile Phone IC
Below are the comprehensive specifications and technical details for this IC. 77645-11 Mobile Phone IC
1. Primary Product Overview
The SKY77645-11 is designed to support a wide array of frequency bands, making it a “global” chip used in smartphones from manufacturers like Samsung, Xiaomi, and various Qualcomm-based devices. Its primary job is to amplify the low-power signal from the transceiver to a level sufficient for transmission via the antenna. 77645-11 Mobile Phone IC
| Attribute | Specification |
| Manufacturer | Skyworks Solutions, Inc. |
| Part Number | SKY77645-11 |
| Product Family | SkyLiTE™ (Multimode Multiband PAM) |
| Technology | InGaP (Indium Gallium Phosphide) BiFET / Silicon CMOS |
| Primary Function | RF Power Amplification (3G/4G/LTE) |
| Control Interface | MIPI® RFFE (Radio Frequency Front End) |
2. Technical Specifications Table
The following table highlights the operational parameters and physical characteristics of the IC.
| Parameter | Technical Detail |
| Frequency Range | 700 MHz to 2.6 GHz |
| Input/Output Impedance | Internally matched to 50 $\Omega$ |
| Package Type | MCM (Multi-Chip Module), 42-pad |
| Package Dimensions | 4.0 mm x 6.8 mm x 0.75 mm |
| Mounting Type | Surface Mount (SMT) |
| Power Control | VCC adjusted via DC-DC converter (APT/ET support) |
| Leakage Current | Extremely low (optimized for standby time) |
| Operating Modes | CDMA, WCDMA, TD-SCDMA, FDD-LTE, TDD-LTE |
3. Supported Network Bands
One of the defining features of the 77645-11 is its massive band support, allowing it to function in multiple regions (North America, Europe, Asia). 77645-11 Mobile Phone IC
3G / WCDMA & TD-SCDMA
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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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Modulation Support: HSDPA, HSUPA, HSPA+, Release 99 Voice
4G / LTE (FDD & TDD)
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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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Channel Bandwidths: 1.4, 3, 5, 10, 15, 20, 30, 35, 40 MHz
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Carrier Aggregation (CA): Supports Uplink CA for Band 39 (up to 35 MHz) and Bands 40/41 (up to 40 MHz).
4. Key Functional Features
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High Power Added Efficiency (PAE): Optimized to ensure that the maximum amount of battery power is converted into RF signal, reducing heat generation. 77645-11 Mobile Phone IC
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MIPI RFFE Programmability: The chip’s bias modes are fully programmable through the MIPI interface, allowing the mobile processor to optimize efficiency vs. linearity in real-time based on signal conditions. 77645-11 Mobile Phone IC
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Average Power Tracking (APT): It is designed to work with DC-DC converters to vary the supply voltage ($V_{CC}$), which significantly saves battery life during low-power transmissions. 77645-11 Mobile Phone IC
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Integrated MFC: The Multi-Function Control block manages the internal switching and logic, reducing the need for external discrete components on the PCB. 77645-11 Mobile Phone IC
5. Physical Architecture & Pin Configuration
The IC is built on a multi-layer laminate substrate where the InGaP die (for amplification) and the Silicon die (for CMOS control) are co-packaged.
Pinout Summary (42-Pad Layout)
While specific pin-mapping is proprietary to the full datasheet, the layout generally follows this structure:
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RF Inputs: Dedicated ports for Low, Mid, and High band signals.
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RF Outputs: 10 output ports to route signals to different antenna filters/duplexers.
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Control Pins: VIO, SDATA, and SCLK for the MIPI RFFE digital interface.
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Power Pins: $V_{CC}$ (Main Power), $V_{BATT}$ (Battery Supply).
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Ground: Center pads are typically dedicated to Thermal Ground for heat dissipation.
6. Applications and Repair Context
This IC is frequently replaced in repair shops when a phone shows “No Service” or “Searching” despite a valid SIM card.
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Compatible Devices: Widely found in Samsung Galaxy “A” and “M” series, Xiaomi Mi/Redmi series, and various Motorola handsets.
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Handling: As a BGA (Ball Grid Array) component, it requires professional micro-soldering tools and a reballing stencil for installation.
Unleash the Power of Efficiency
The 77645-11 Mobile Phone IC is designed to elevate your mobile device’s performance while ensuring optimal power management. Built for modern-day smartphones, this cutting-edge integrated circuit offers excellent compatibility and reduces energy consumption without compromising functionality.
Compact and Reliable Design
Engineered with precision, the 77645-11 IC boasts a compact design that easily integrates into various smartphone architectures. Its durability ensures extended lifecycle efficiency, even under high-performance demands, making it a reliable choice for manufacturers and repair professionals.
Exceptional Performance Attributes
Equipped with advanced technology, the 77645-11 Mobile Phone IC delivers seamless performance with reduced interference issues. Its innovative structure enhances processing speed and guarantees smoother operations, adding value to any mobile device assembly or repair project.
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