LM 36273 ORIGINAL Mobile Phone IC
Enhance Your Device’s Efficiency
The LM 36273 ORIGINAL Mobile Phone IC is built to deliver exceptional performance for your mobile devices. Designed to maintain optimal power management, this IC ensures your device operates smoothly and efficiently—perfect for professionals and tech enthusiasts alike. LM 36273 ORIGINAL Mobile Phone IC
Reliable and Durable Design
Manufactured to meet high-quality standards, the LM 36273 ORIGINAL IC boasts outstanding durability and reliability. Its advanced design ensures long-term functionality, making it a must-have component for any mobile device that demands dependability. LM 36273 ORIGINAL Mobile Phone IC
Perfect Compatibility for Tech Solutions
With a versatile design, the LM 36273 ORIGINAL Mobile Phone IC is compatible with a wide range of mobiles and devices. Whether you’re repairing or upgrading, this IC is a practical solution for enhancing the performance of modern mobile gadgets. LM 36273 ORIGINAL Mobile Phone IC
The LM36273 is a high-performance, integrated three-channel White LED (WLED) driver and LCD bias supply manufactured by Texas Instruments. Primarily found in modern smartphones like the Redmi Note 8, Honor 20i, and Nova 2, it is a critical “Graphics and Light Combo” IC responsible for both screen illumination and the voltages required for the display to render images. LM 36273 ORIGINAL Mobile Phone IC
Technical Overview
The LM36273 is designed to minimize board space in slim mobile architectures. It integrates a backlight boost converter capable of driving up to 24 LEDs (three parallel strings) and an LCD bias boost that provides the positive and negative rails ($\pm 4\text{V}$ to $\pm 6.5\text{V}$) necessary for LCD panels.
Detailed Specifications Table
| Feature / Parameter | Specification Details |
| Manufacturer | Texas Instruments (TI) |
| Model Number | LM36273 |
| Package Type | DSBGA (24-pin), Ultra-compact |
| Body Size | 2.44 mm × 1.67 mm |
| Input Voltage Range | 2.7V to 5V (Typical Li-ion Battery range) |
| Number of LED Channels | 3 Parallel White LED Strings |
| Max Output Voltage ($V_{OUT}$) | Up to 29V (Backlight Boost) |
| LED Current per Channel | 60 µA to 30 mA |
| Dimming Control | 11-Bit Exponential and Linear Dimming |
| Control Interfaces | $I^2C$ Bus and Logic Level PWM |
| LCD Bias Voltages | Programmable $\pm 4\text{V}$ to $\pm 6.5\text{V}$ |
| LCD Bias Resolution | 50-mV steps |
| Peak Efficiency | Up to 92% |
| Operating Temperature | -40°C to 85°C |
| External Components | Requires 4.7-µH to 15-µH Inductor |
Key Functions in Mobile Devices
1. Advanced Backlight Management
The IC utilizes a constant current regulation technique. This is vital for mobile phones because it prevents flicker and ensures uniform brightness across the display, even when the battery voltage drops. The 11-bit dimming allows for incredibly smooth transitions between brightness levels, which is what makes “Adaptive Brightness” feel seamless to the user.
2. Integrated LCD Bias Power
Most LCDs require two specific voltages to orient the liquid crystals: a positive voltage ($V_{POS}$) and a negative voltage ($V_{NEG}$).
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LM36273 generates both using a single boost converter and an inverting charge pump.
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It includes auto-sequencing, which ensures the positive rail turns on slightly before the negative rail (or vice-versa) to prevent damage to the display panel during boot-up.
3. Energy Efficiency
With a peak efficiency of 92%, this IC is designed to maximize battery life. It reduces power consumption by dynamically adjusting its switching frequency and output based on the display’s current needs.
Hardware Pin Configuration
The LM36273 uses a 24-ball BGA (Ball Grid Array) layout. Common pins include:
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VBATT: Main power input from the battery.
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SDA/SCL: $I^2C$ data and clock lines for communication with the phone’s CPU.
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LED1, LED2, LED3: Current sinks for the backlight strings.
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VPOS / VNEG: Outputs for the LCD display power.
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PWM: Input for hardware-level brightness control.
Repair & Compatibility Notes
In the mobile repair industry, the LM36273 is often referred to as the “Light IC” or “Graphics IC”.
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Common Symptoms of Failure: A phone that turns on (vibrates or makes sound) but has a completely black screen, or a screen that is visible only under a bright flashlight (indicating backlight failure).
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Replacement: Since this is a BGA chip, replacement requires professional SMD soldering tools, including a hot air station and high-quality flux. It is often cross-compatible with specific versions of the LM36272 (2-channel) or LM36274 (4-channel) depending on the circuit design, but using the original LM36273 is recommended for stability.
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