BQ 24296M Mobile Phone IC

Optimized Power Management

The BQ 24296M Mobile Phone IC offers an advanced power management solution for mobile devices, designed to allow seamless charging and battery optimization. This integrated circuit ensures high efficiency, providing longer battery life and balanced performance. BQ 24296M Mobile Phone IC

Versatile Compatibility

Engineered for compatibility with a wide range of mobile devices, the BQ 24296M helps maintain steady power performance, making it an ideal component for smartphones, tablets, and other portable electronics.

Compact and Reliable Design

With its compact form factor, the BQ 24296M is easy to integrate into various device designs. Its durable and reliable construction ensures consistent performance under various operational conditions, meeting the needs of modern mobile technology. BQ 24296M Mobile Phone IC

The BQ24296M is a highly integrated 3-A switch-mode battery charge management and system power path management device. It is specifically designed for single-cell Li-ion and Li-polymer batteries used in smartphones and tablets. BQ 24296M Mobile Phone IC

Here are the full specifications and technical details for the BQ24296M in a detailed format. BQ 24296M Mobile Phone IC

Technical Specifications Table

Feature	Detailed Specifications
Manufacturer	Texas Instruments (TI)
Function	$I^2C$ Controlled Single-Cell USB Charger
Input Voltage Range	3.9 V to 6.2 V (Standard Operating)
Max Input Voltage	17 V (Absolute Maximum), 6.4 V Over-Voltage Protection
Charge Current	Up to 3.0 A (Fast Charging)
Efficiency	90% High-Efficiency Switch Mode
USB Support	Supports USB 2.0, USB 3.0, and high-voltage adapters
OTG Output	Adjustable 4.55 V to 5.5 V @ 1 A or 1.5 A
Switching Frequency	1.5 MHz
Quiescent Current	20 µA (Battery Leakage) / Supports Shipping Mode
Operating Temperature	$-40^\circ\text{C}$ to $85^\circ\text{C}$
Package Type	24-Pin VQFN ( $4.0 \text{ mm} \times 4.0 \text{ mm}$ )

Functional Pin Layout

The BQ24296M uses a 24-pin VQFN configuration designed for efficient heat dissipation and low profile.

VBUS (Pin 24): Power supply input from the charger or USB.
SW (Pins 20, 21): Switching node connected to the output inductor. BQ 24296M Mobile Phone IC
SYS (Pins 15, 16): System output voltage rail for the device. BQ 24296M Mobile Phone IC
BAT (Pins 13, 14): Connected to the positive terminal of the battery.BQ 24296M Mobile Phone IC
SCL/SDA (Pins 5, 6): $I^2C$ clock and data lines for host communication. BQ 24296M Mobile Phone IC
OTG (Pin 7): Active high enable for USB On-The-Go boost mode.
TS (Pin 10): Temperature sense input for battery thermistor monitoring.
REGN (Pin 22): Internal LDO output (typically $6\text{V}$ ) for gate driving.

Detailed Operation and Features

1. Narrow VDC (NVDC) Power Path

The BQ24296M utilizes the NVDC power path management architecture. This system allows the smartphone to turn on immediately upon plugging in a charger, even if the battery is fully discharged or missing. The IC regulates the system voltage slightly above the battery voltage but keeps it within a safe operating range for the phone’s main processor.

2. $I^2C$ Serial Interface

Total control of the charging process is managed through the $I^2C$ interface. The host processor (the phone’s CPU) can program parameters such as:

Charge Voltage: Adjustable up to $4.4\text{V}$ for high-capacity cells.
Termination Current: Sets when the charger should stop pumping current.
Safety Timers: Prevents the battery from being charged indefinitely if a fault occurs.

3. High-Performance OTG Boost Mode

In USB OTG mode, the BQ24296M reverses its operation. Instead of stepping down voltage to charge the battery, it steps up the battery voltage to provide $5\text{V}$ at the VBUS pin. This allows the phone to power accessories like USB flash drives, keyboards, or mice. It features a fast OTG startup of approximately $22\text{ms}$ .

4. Comprehensive Safety Protections

Battery Temperature Sensing: Uses the TS pin to monitor battery heat. If the battery is too cold ( $<0^\circ\text{C}$ ) or too hot ( $>45^\circ\text{C}$ ), charging is suspended.
Input Over-Voltage Protection: If the charger input exceeds $6.4\text{V}$ , the IC instantly disconnects the internal path to prevent damage.
Thermal Shutdown: If the silicon die temperature reaches $160^\circ\text{C}$ , the IC enters a safe state to prevent physical damage to the motherboard.

Repair and Troubleshooting Symptoms

In mobile repair (Commonly found in Xiaomi, Vivo, Huawei, and Oppo), this IC is often replaced when:

Phone is not charging: Voltage is present at VBUS but absent at the battery connector.
Fake Charging: The lightning icon appears, but the battery percentage does not increase.
Low REGN Voltage: If the REGN pin measures below $5.5\text{V}-6\text{V}$ when plugged in, the IC is usually faulty.
Heating Issue: The IC gets burning hot immediately upon plugging in a charging cable.

BQ24296M vs. BQ25601

While both are 3A chargers, the BQ24296M is an earlier generation compared to the BQ25601. The BQ24296M has a slightly lower input voltage limit ( $6.2\text{V}$ vs $13.5\text{V}$ for the 25601) and different $I^2C$ register maps. They are generally not directly interchangeable without modifying the phone’s firmware or PCB.

BQ 24296M Mobile Phone IC