TPS 65634A Mobile Phone IC
Built for Cutting-Edge Mobile Performance
The TPS 65634A Mobile Phone IC is a powerful and robust solution designed to optimize the performance of today’s smartphones. It ensures seamless functionality across all essential components, driving efficiency and reliability for devices that must perform in demanding environments. TPS 65634A Mobile Phone IC
Compact Design with High Efficiency
This IC boasts a compact design, making it an ideal choice for modern slim smartphone designs. Despite its size, it delivers high performance with enhanced power management, ensuring energy efficiency while maintaining device longevity. TPS 65634A Mobile Phone IC
Reliable and Versatile Functionality
The TPS 65634A is engineered with versatility in mind, supporting a wide variety of applications in mobile devices. With its superior build quality and innovative technology, it is a trusted component by smartphone manufacturers worldwide, delivering consistent results with every use. TPS 65634A Mobile Phone IC
The TPS65634A is a highly specialized Power Management Integrated Circuit (PMIC), primarily designed as a Triple-Output AMOLED Display Power Supply. It is a critical component in high-end mobile devices—such as the Xiaomi Mi 9, Redmi K20, and BlackShark 2—where it manages the precise voltage requirements for vibrant, energy-efficient display panels. TPS 65634A Mobile Phone IC
Below is the comprehensive technical breakdown and specifications for the TPS65634A IC. TPS 65634A Mobile Phone IC
1. Product Overview
The TPS65634A (often interchangeable with or related to the TPS65632 series) belongs to Texas Instruments’ family of display power solutions. It integrates three separate power converters to provide the positive and negative rails required by AMOLED pixels, as well as the logic supply for the display driver. TPS 65634A Mobile Phone IC
Key Functionality:
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VPOS (Positive Rail): Drives the anode of the AMOLED pixels.
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VNEG (Negative Rail): Drives the cathode, allowing for true blacks by cutting off pixel current.
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AVDD (Auxiliary Rail): Provides the bias voltage for the display’s analog circuitry.
2. Full Technical Specifications
The following table details the electrical and thermal parameters essential for hardware engineers and repair technicians.
| Feature / Parameter | Specification Detail |
| Model Number | TPS65634A (often marked as “50375S” or “LK” in circuit diagrams) |
| Primary Function | Triple-Output AMOLED Power Supply / LCD Backlight Driver |
| Input Voltage Range ($V_I$) | 2.9 V to 4.5 V (Optimized for Single-cell Li-ion batteries) |
| Output Channel 1 (VPOS) | Boost Converter; 4.6 V Default; up to 300 mA |
| Output Channel 2 (VNEG) | Inverting Buck-Boost; -1.5 V to -5.4 V (Programmable) |
| Output Channel 3 (AVDD) | Boost Converter; 5.8 V to 7.7 V (Typical) |
| Voltage Accuracy | ±0.5% (at 25°C to 85°C) |
| Control Interface | Digital Control Pin (CTRL) via PWM or Single-Wire |
| Efficiency | Up to 90% (Load dependent) |
| Package Type | WQFN-16 (3.00 mm × 3.00 mm) |
| Operating Temperature ($T_J$) | -40°C to +125°C |
| Safety Features | Short-Circuit Protection (SCP), Thermal Shutdown, Over-Voltage |
| Pin Count | 16-Pin with Thermal Pad |
3. Pin Configuration & Functions
Understanding the pinout is vital for “dead phone” diagnostics and reballing procedures.
| Pin Number | Name | Description |
| 1 | PVIN | Power Input for VPOS/AVDD boost converters. |
| 2 | AVIN | Analog Input for internal control circuitry. |
| 3 | EN | Enable pin for the device logic. |
| 4 | CTRL | Programming pin for VNEG output and dimming control. |
| 5-7 | OUTP1/2 | Positive output sense and power pins (VPOS). |
| 8-10 | OUTN | Negative output pins (VNEG). |
| 11-13 | SWP/SWN | Switch nodes for internal MOSFETs and external inductors. |
| 14-16 | AGND/PGND | Analog and Power Ground connections. |
4. Application & Device Compatibility
The TPS65634A is the “heart” of the display power section. If this IC fails, the phone will typically vibrate and show signs of life (incoming calls, notifications) but the screen will remain completely black.
Common Compatible Models:
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Xiaomi: Mi 9, Mi 9T, Redmi K20, Redmi K20 Pro, Redmi 9. TPS 65634A Mobile Phone IC
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Huawei: Mate 20X, Nova 3e. TPS 65634A Mobile Phone IC
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Oppo/Vivo: R11S Plus and various X-series models. TPS 65634A Mobile Phone IC
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Gaming Phones: BlackShark 2. TPS 65634A Mobile Phone IC
Symptoms of a Failing TPS65634A:
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Black Screen (No Backlight): The phone turns on, but no image is visible even with a flashlight.
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Flickering Display: Unstable VNEG/VPOS rails cause the AMOLED pixels to shimmer or shift colors.
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Overheating near CPU: Since the PMIC handles high current, a shorted IC will generate localized heat on the motherboard.
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Boot Loops: A shorted AVDD rail can cause the main Power Management IC (PMIC) to trigger a safety shutdown.
5. Repair & Handling Guidelines
For technicians performing chip-level repair, the TPS65634A is sensitive to thermal stress.
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Micro-soldering Temperature: Recommended hot air station setting is 320°C – 350°C with low airflow to avoid “blowing” away surrounding 0201 resistors.
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Orientation: Always note the “dot” or “notch” on the corner of the IC. Installing it 90 or 180 degrees out of phase will result in a permanent short circuit.
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Cleaning: Use 99% Isopropyl Alcohol to clean the pads after desoldering to ensure the 16 balls of the new BGA seat perfectly.
Note: The TPS65634A is often listed by vendors as “Display IC” or “Light IC.” While AMOLEDs don’t have a traditional “backlight” (pixels are self-emissive), this IC provides the power they need to light up.
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