BQ 24296M Original Mobile Phone IC

High-Quality Solution for Mobile Devices

The BQ 24296M Original Mobile Phone IC is the ideal choice for those seeking a reliable power management solution. Designed with precision and efficiency, this IC ensures optimal performance for a wide range of mobile devices, making it an essential component for device repair or customization needs. BQ 24296M Original Mobile Phone IC

Exceptional Performance and Compatibility

Featuring advanced engineering, the BQ 24296M integrates seamlessly into a variety of smartphone models. Its optimized design supports fast and stable power delivery, boosting device longevity and efficiency. Whether you’re a hobbyist or a professional technician, this IC is catered to meet your specific requirements. BQ 24296M Original Mobile Phone IC

Why Choose the BQ 24296M?

By selecting the BQ 24296M, you secure a dependable and high-performance IC that adheres to strict quality standards. Its original design guarantees excellent functionality and ensures your mobile devices maintain their peak performance. Upgrade your repair toolkit or inventory today with this versatile and reliable component. BQ 24296M Original Mobile Phone IC

The BQ24296M is a highly versatile, $I^2C$ controlled 3-Ampere switch-mode battery charge management and power path management IC. Specifically engineered for single-cell Li-ion and Li-polymer batteries, it is widely utilized in smartphones from manufacturers like Xiaomi (Mi/Redmi), Vivo, and Oppo. BQ 24296M Original Mobile Phone IC

The following guide provides a comprehensive technical breakdown of the BQ24296M in the requested detail. BQ 24296M Original Mobile Phone IC

1. Technical Specifications Overview

The BQ24296M stands out due to its Narrow VDC (NVDC) power path management, which allows the system to remain powered even when the battery is absent or deeply discharged. BQ 24296M Original Mobile Phone IC

Parameter	Detailed Specification
Manufacturer	Texas Instruments (TI)
IC Topology	Synchronous Buck (Charging) / Boost (OTG)
Input Voltage (Operating)	$3.9\text{V}$ to $6.2\text{V}$
Absolute Max Input	$15\text{V}$
Max Charge Current	$3.0\text{A}$ (Programmable via $I^2C$ )
Efficiency	$90\%$ at $2\text{A}$ charging
USB Support	BC1.2 compliant, USB 2.0/3.0 current limits
Boost Mode (OTG)	$4.55\text{V}$ to $5.5\text{V}$ adjustable at $1.0\text{A}$ / $1.5\text{A}$
Switching Frequency	$1.5\text{MHz}$
Quiescent Current	$20\text{\mu A}$ (Low battery leakage/Shipping mode)
Charge Voltage Accuracy	$\pm 0.5\%$
Package Type	24-Pin VQFN ( $4.0\text{mm} \times 4.0\text{mm}$ )

2. Pinout Configuration and Functional Logic

The IC utilizes a 24-pin architecture. For technicians and engineers, understanding these specific pins is vital for circuit design and troubleshooting:

VBUS (Pin 24): Input power pin. It features a $6.4\text{V}$ Over-Voltage Protection (OVP) threshold to prevent damage from faulty high-voltage adapters.
SW (Pins 20, 21): The switching node connected to the inductor. This is the heart of the buck-boost conversion process. BQ 24296M Original Mobile Phone IC
SYS (Pins 15, 16): System voltage output. This pin supplies power to the phone’s internal components while simultaneously charging the battery. BQ 24296M Original Mobile Phone IC
BAT (Pins 13, 14): Connection to the Battery positive terminal. BQ 24296M Original Mobile Phone IC
REGN (Pin 22): Internal LDO output. Typically measures around $6\text{V}$ when a charger is connected; if this voltage is missing, the IC is likely defective. BQ 24296M Original Mobile Phone IC
SCL/SDA (Pins 5, 6): $I^2C$ clock and data lines. The phone’s CPU uses these to tell the IC exactly how much current to draw.
TS (Pin 10): Temperature sense pin. Connects to the battery’s thermistor to monitor for overheating.

3. Core Operational Features

Power Path Management (NVDC)

The BQ24296M manages the power flow between the charger, the battery, and the system. If the system requires more power than the charger can provide, the IC enters Battery Supplement Mode, where the battery and charger work together to power the device. This prevents the phone from shutting down during high-performance tasks (like gaming) while charging.

High-Efficiency Charging

With a $90\%$ efficiency rating, the IC minimizes heat generation. This is critical in modern thin smartphones where thermal dissipation is a challenge. The 1.5 MHz frequency allows for the use of very small inductors ( $1.0\mu\text{H}$ ), saving valuable motherboard space.

USB OTG Support

The IC is capable of reversing its operation. When a user plugs in a USB drive or mouse (OTG), the BQ24296M acts as a Boost Converter, taking the battery’s $3.7\text{V}$ and stepping it up to a stable $5\text{V}$ to power the external accessory.

4. Safety and Protection Mechanisms

Designed for high reliability, the BQ24296M includes multiple layers of protection:

Thermal Throttling: If the IC die temperature hits $120^\circ\text{C}$ , it automatically reduces the charging current to prevent hardware failure.
Input OVP: If a voltage higher than $6.4\text{V}$ is detected on VBUS, the IC disconnects the internal circuit to prevent a “blown” board.
Safety Timer: It includes a programmable timer that stops charging if the battery does not reach a certain voltage within a specific time, protecting against faulty battery cells.
Hiccup Mode: In OTG mode, if there is a short circuit in the USB accessory, the IC enters a “hiccup” state to prevent current spikes from damaging the phone.

5. Typical Repair Symptoms

In the mobile repair industry, the BQ24296M is often replaced when the following issues occur:

Slow Charging: The phone draws only $0.4\text{A}$ or $0.5\text{A}$ despite using a fast charger.
Fake Charging: The lightning bolt icon appears, but the battery percentage never increases.
Overheating: The area around the charging IC becomes burning hot immediately upon plugging in a cable.
Dead Phone (VBUS Short): A short inside the BQ24296M can ground the primary power line, preventing the phone from turning on entirely.

6. Comparison: BQ24296M vs BQ25601

While both are common, the BQ25601 is a newer generation often seen as an upgrade. The BQ25601 generally handles higher input voltages (up to $13.5\text{V}$ operational) compared to the BQ24296M’s $6.2\text{V}$ limit, making the BQ25601 more suitable for “Quick Charge” (9V/12V) standards.

BQ 24296M Original Mobile Phone IC