Overview
The FAN54005UCX, produced by onsemi, is a highly integrated switch-mode charger designed for single-cell Li-ion and Li-polymer battery packs. This USB-compliant charger supports a wide range of charging currents from 200 mA to 1.45 A, configurable using a single external resistor. The device features a high-speed I2C interface for programming various charging parameters and operating modes. It includes a synchronous buck regulator for charging and a synchronous boost regulator for USB On-The-Go (OTG) applications, ensuring high efficiency across various battery voltages and charge states.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Current Limit (IINLIM) | - | - | 500 mA | - |
| Charge Current Regulation Accuracy | - | - | ±5% | - |
| Charge Voltage Accuracy | - | ±0.5% at 25°C | ±1% from 0 to 125°C | - |
| Maximum Input Operating Voltage | - | - | 6 V | - |
| Absolute Maximum Input Voltage | - | - | 20 V | - |
| Oscillator Frequency (fSW) | 2.7 MHz | 3.0 MHz | 3.3 MHz | - |
| Boost Output Voltage (VBOOST) | 4.77 V | 5.07 V | 5.17 V | - |
| Operating Temperature Range | -40°C | - | +85°C | - |
| Package Type | - | - | 20-bump, 0.4 mm Pitch WLCSP | - |
Key Features
- Fully integrated, high-efficiency charger for single-cell Li-ion and Li-polymer battery packs.
- Programmable charging parameters through a high-speed I2C interface (up to 3.4 Mbps).
- Supports 200 mA to 1.45 A charging systems with high efficiency (up to 95%).
- 3 MHz synchronous buck PWM controller with wide duty cycle range.
- Small footprint with a 1 μH external inductor.
- Safety timer with reset control and dynamic input voltage control.
- Low reverse leakage to prevent battery drain to VBUS.
- 5 V, 500 mA boost mode for USB OTG with 3.0 V to 4.5 V battery input.
- 1.8 V regulated output from VBUS for auxiliary circuits.
- Automatic restart of charge cycle when battery falls below an internal threshold.
- High-impedance mode to prevent leakage from the battery to the input when the input source is removed.
Applications
- Wireless speakers and headphones.
- Cell phones and gaming devices.
- Toys, drones, and digital cameras.
- IoT devices.
- E-cigarettes and vapes.
Q & A
- What is the FAN54005UCX used for?
The FAN54005UCX is a highly integrated switch-mode charger for single-cell Li-ion and Li-polymer battery packs.
- What are the configurable charging current ranges for the FAN54005UCX?
The charging current can be configured from 200 mA to 1.45 A using a single external resistor.
- How is the charging parameters programmed in the FAN54005UCX?
The charging parameters are programmable through a high-speed I2C interface (up to 3.4 Mbps).
- What is the efficiency of the FAN54005UCX charger?
The charger has an efficiency of up to 95% for 200 mA-hour batteries, 94% for 500 mA-hour batteries, and 90% for 1.0 A-hour batteries.
- What is the maximum input operating voltage for the FAN54005UCX?
The maximum input operating voltage is 6 V, with an absolute maximum input voltage of 20 V.
- What are the operating modes of the FAN54005UCX?
The device has three operating modes: Charge Mode, Boost Mode, and High-Impedance Mode.
- How does the FAN54005UCX protect against overheating?
The charge current is reduced when the die temperature reaches 120°C to protect the device and PCB from damage.
- What is the purpose of the safety timer in the FAN54005UCX?
The safety timer provides a safety backup for the I2C host and can be reset.
- How does the FAN54005UCX handle battery removal or insertion during charging?
The device can automatically restart the charge cycle when the battery is reinserted and falls below an internal threshold.
- What is the package type of the FAN54005UCX?
The device is available in a 20-bump, 0.4 mm Pitch WLCSP package.
