LM 36272 Mobile Phone IC
Exceptional Power Management for Modern Devices
The LM 36272 Mobile Phone IC is designed to deliver superior power regulation for smartphones and other mobile devices. Engineered with cutting-edge technology, this IC ensures your mobile electronics function optimally while maintaining energy efficiency. LM 36272 Mobile Phone IC
Compact, Reliable, and Versatile
With its compact size and multi-functional design, the LM 36272 IC is ideal for manufacturers seeking reliable components to enhance mobile phone performance. Its versatile application makes it suitable for various device configurations. LM 36272 Mobile Phone IC
Precision Engineering for Enhanced Performance
Optimize your device capabilities with the LM 36272 Mobile Phone IC. Its robust architecture and precision engineering guarantee seamless operation, improved energy savings, and longevity, setting the benchmark for mobile IC components. LM 36272 Mobile Phone IC
The LM36272 is a highly integrated power management solution manufactured by Texas Instruments. Specifically designed for mobile devices like smartphones and tablets, it functions as a two-channel White LED (WLED) driver combined with an LCD bias supply. LM 36272 Mobile Phone IC
In the world of mobile repair and hardware design, it is frequently referred to as a “backlight IC” or “light control IC.” It is the component responsible for ensuring your screen is bright, evenly lit, and capable of dimming smoothly without flickering. LM 36272 Mobile Phone IC
LM36272 Technical Specifications
The following table outlines the core electrical and physical parameters of the LM36272.
| Feature | Specification Details |
| Manufacturer | Texas Instruments (TI) |
| Function | 2-Channel WLED Driver + LCD Bias Supply |
| Input Voltage Range | 2.7 V to 5.0 V |
| Max Output Voltage (Backlight) | 29 V |
| LED Current per Channel | 60 µA to 30 mA |
| Dimming Resolution | 11-Bit (Exponential and Linear) |
| LCD Bias Voltage (Positive) | +4 V to +6.5 V (50-mV steps) |
| LCD Bias Voltage (Negative) | -4 V to -6.5 V (50-mV steps) |
| LCD Bias Current | Up to 80 mA per output |
| Peak Efficiency | Up to 92% |
| Switching Frequency | 1.05 MHz (Adjustable) |
| Control Interface | $I^2C$ and PWM (Pulse Width Modulation) |
| Package Type | DSBGA-24 (24-pin Die-Size Ball Grid Array) |
| Dimensions | Approx. 1.8 mm x 2.6 mm |
| Operating Temperature | -40°C to +85°C |
Key Functional Components
To understand how the LM36272 operates within a mobile phone, it is helpful to look at its three primary “blocks”:
1. The Backlight Boost Converter
This section takes the low voltage from the phone’s battery (usually around 3.7 V) and “boosts” it up to as much as 29 V. This high voltage is necessary to drive strings of LEDs connected in series behind the LCD panel.
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Zone Dimming: Since it has two channels, it can control two separate strings of LEDs, allowing for more uniform brightness across larger screens.
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Precision: It features a 0.2% current matching between strings, which prevents one side of your screen from appearing brighter than the other.
2. LCD Bias Supply (Positive & Negative)
LCD pixels require specific bias voltages to “twist” and allow light to pass through. The LM36272 generates both:
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Positive Bias (Vpos): Handled by a positive LDO.
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Negative Bias (Vneg): Handled by an inverting charge pump. The IC includes Auto-Sequencing, which ensures the positive voltage turns on before the negative voltage (or vice-versa, depending on settings) to prevent “ghosting” or damage to the LCD panel during power-up.
3. Advanced Dimming Control
Instead of simple “On/Off” dimming, the LM36272 uses 11-bit resolution. This provides 2,048 levels of brightness, making transitions (like when your phone screen slowly fades to sleep) look perfectly smooth to the human eye. It also supports CABC (Content Adaptive Backlight Control), which reduces backlight power based on the image being displayed to save battery life.
Common Applications and Repair Context
The LM36272 is found in a wide variety of mid-range and flagship Android smartphones, including models from Samsung (e.g., Galaxy A21s), Huawei/Honor (e.g., Honor 20i), and Xiaomi (e.g., Redmi Note 8 Pro).
Signs of a Failing LM36272:
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No Backlight: The phone turns on and vibrates, and you can see a faint image with a flashlight, but the screen remains dark.
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Flickering: The screen brightness fluctuates rapidly.
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Half-Dark Screen: One LED string has failed or the IC is not providing power to one of its two channels.
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Overheating: The area near the display connector on the motherboard becomes extremely hot.
Note for Technicians: Because this is a BGA (Ball Grid Array) chip, replacement requires a hot air rework station and precision soldering skills. The chip is sensitive to electrostatic discharge (ESD) and excessive heat during the “reballing” or installation process.
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