LM 3697/D8 ORIGINAL Mobile Phone IC
Premium Quality and Reliability
The LM 3697/D8 ORIGINAL Mobile Phone IC is engineered to deliver exceptional performance and ensure your device operates smoothly. Crafted with precision, this IC offers unmatched quality you can rely on for optimal functionality in mobile devices. LM 3697/D8 ORIGINAL Mobile Phone IC
Designed for Compatibility
This mobile phone IC is specifically designed to fit seamlessly within a wide range of devices, ensuring compatibility and hassle-free integration. Perfect for repairs, replacements, or upgrades, the LM 3697/D8 is a trusted choice for professionals and DIY enthusiasts alike. LM 3697/D8 ORIGINAL Mobile Phone IC
Durable and Efficient
Built to last, the LM 3697/D8 ORIGINAL IC ensures durability and efficiency in every application. With its top-notch design and reliable technology, it prolongs the lifespan of your mobile phone and enhances performance effortlessly. LM 3697/D8 ORIGINAL Mobile Phone IC
The LM3697 (often marked with the code D8 in mobile repair circles) is a high-efficiency triple-string LED driver designed primarily for smartphone backlight units. Manufactured by Texas Instruments, it is a staple in the “Light IC” section of Android motherboards, particularly in devices from Oppo, Vivo, and Xiaomi. LM 3697/D8 ORIGINAL Mobile Phone IC
Below are the full technical specifications, pinout details, and functional overview. LM 3697/D8 ORIGINAL Mobile Phone IC
1. Technical Specifications Table
The LM3697 is a boost-converter-based driver that manages power for the display’s backlighting LEDs.
| Parameter | Specification Details |
| Part Number / Marking | LM3697 / D8 |
| Manufacturer | Texas Instruments |
| Topology | Inductive Boost (Step-Up) |
| Input Voltage Range ($V_{IN}$) | $2.7V$ to $5.5V$ |
| Output Voltage ($V_{OUT}$) | Up to $40V$ (Adaptive) |
| Number of Channels | 3 Parallel High-Voltage LED Strings |
| Max Current per Channel | $30mA$ |
| Peak Efficiency | Up to $90\%$ |
| Switching Frequency | Selectable $500kHz$ or $1MHz$ |
| Dimming Resolution | 11-Bit (2048 steps) Exponential or Linear |
| Interface | $I^2C$ Compatible |
| Protection Features | OVP (16V, 24V, 32V, 40V), OCP, Thermal Shutdown |
| Operating Temperature | $-40°C$ to $+85°C$ (Ambient) |
| Package Type | 12-pin DSBGA (1.64 mm x 1.29 mm) |
2. Pin Configuration (12-Pin DSBGA)
Understanding the pinout is critical for motherboard-level troubleshooting and “reballing” the IC.
| Pin Number | Name | Function |
| A1 | VIN | Power Supply Input |
| A2 | SW | Drain of the internal MOSFET (Switching Node) |
| A3 | HVLED1 | Current Sink Input for LED String 1 |
| B1 | SCL | $I^2C$ Serial Clock Input |
| B2 | PGND | Power Ground |
| B3 | HVLED2 | Current Sink Input for LED String 2 |
| C1 | SDA | $I^2C$ Serial Data Input/Output |
| C2 | HWEN | Hardware Enable (Active High) |
| C3 | HVLED3 | Current Sink Input for LED String 3 |
| D1 | PWM | PWM Input for CABC (Content Adjustable Backlight Control) |
| D2 | OVP | Over-Voltage Protection Sense Pin |
| D3 | GND | Analog Ground |
3. Key Functional Features
High-Resolution Dimming
The LM3697 stands out due to its 11-bit dimming resolution. This allows for extremely smooth transitions in screen brightness, eliminating the “flicker” or “stepping” effect seen in lower-quality drivers. It supports both exponential dimming (which matches the human eye’s perception of light) and linear dimming. LM 3697/D8 ORIGINAL Mobile Phone IC
Integrated 1-A/40-V MOSFET
By integrating a powerful MOSFET, the IC minimizes the number of external components needed on the crowded mobile motherboard. It only requires an external inductor, a Schottky diode, and a few capacitors to function as a full boost converter. LM 3697/D8 ORIGINAL Mobile Phone IC
Adaptive Boost Control
The IC “senses” the forward voltage of the LED strings and automatically adjusts its boost output to provide just enough headroom. This prevents power wastage, which is why it can reach 90% efficiency, directly contributing to longer battery life in smartphones. LM 3697/D8 ORIGINAL Mobile Phone IC
4. Common Repair Symptoms (Mobile Repair Context)
In the mobile repair industry, the D8 IC is frequently replaced when a phone has “no light” but still shows a “graphic” (visible under a bright torch).
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No Backlight: The most common failure. Often caused by water damage near the HVLED pins or a shorted boost capacitor.
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Flickering Screen: Indicates unstable current regulation or a failing internal MOSFET.
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Half-Dark Screen: Since the IC has 3 channels, a failure in one channel (e.g., HVLED1) can result in one-third of the screen remaining dark.
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Overheating: If the IC or the surrounding area (especially the boost coil) gets extremely hot, it usually indicates a short circuit in the output line ($V_{OUT}$).
Replacement Pro-Tip
The LM3697 is a BGA (Ball Grid Array) chip. When replacing it:
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Air Temperature: Use approximately $330°C – 350°C$ for removal.
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Directionality: Note the “dot” on the chip corner for correct orientation; installing it backwards will cause a short and potentially damage the CPU’s $I^2C$ lines.
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