Overview
The NCP1854FCCT1G is a fully programmable single-cell Lithium-ion switching battery charger developed by onsemi. This device is optimized for charging from a USB compliant input supply and AC adapter power source. It integrates a synchronous PWM controller, power MOSFETs, and comprehensive charge cycle monitoring with safety features under software supervision. The NCP1854 also supports USB On-The-Go (OTG) functionality and includes an optional battery FET for weak battery operation and system isolation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | -0.3 to +28 | V |
| Output Current Capability | 2.5 A | A |
| Boost Converter Input Operating Range | 3.1 to 4.6 | V |
| Boost Output Voltage | 5.00 to 5.15 | V |
| Switching Frequency | 1.35 to 1.65 MHz | MHz |
| I2C Clock Frequency | 3.4 MHz | MHz |
| Operating Temperature Range | -40°C to +85°C | °C |
| Package Type | 2.2 x 2.55 mm CSP | - |
Key Features
- 2.5 A Buck Converter with Integrated Pass Devices
- Input Current Limiting to Comply with USB Standard
- Automatic Charge Current for AC Adaptor Charging
- High Accuracy Voltage and Current Regulation
- Input Overvoltage Protection up to +28 V
- 1000 mA Boosted Supply for USB OTG Peripherals
- Reverse Leakage Protection to Prevent Battery Discharge
- Protected USB Transceiver Supply Switch
- Dynamic Power Path with Optional Battery FET
- Silicon Temperature Supervision for Optimized Charge Cycle
- Safety Timers and Flag Output for Charge Status and Interrupts
- I2C Control Bus up to 3.4 MHz
- Pb-Free and RoHS Compliant
Applications
- Smartphones
- Handheld Devices
- Tablets
- PDAs (Personal Digital Assistants)
Q & A
- What is the maximum input voltage for the NCP1854?
The maximum input voltage for the NCP1854 is +28 V.
- What is the output current capability of the NCP1854?
The output current capability of the NCP1854 is 2.5 A.
- Does the NCP1854 support USB OTG?
Yes, the NCP1854 provides USB OTG support by boosting the battery voltage and offering an overvoltage protected power supply for USB transceivers.
- How is the charge cycle monitored and controlled in the NCP1854?
The charge cycle is monitored and controlled through software supervision using an I2C interface. The device integrates a synchronous PWM controller and power MOSFETs.
- What safety features are included in the NCP1854?
The NCP1854 includes input overvoltage protection, safety timers, and silicon temperature supervision for optimized charge cycles.
- Can the NCP1854 handle weak battery conditions?
Yes, the NCP1854 supports weak battery operation with an optional battery FET that can isolate the battery from the system and pre-charge it to a sufficient level.
- What is the operating temperature range of the NCP1854?
The operating temperature range of the NCP1854 is -40°C to +85°C.
- What is the package type of the NCP1854?
The NCP1854 comes in a 2.2 x 2.55 mm CSP package.
- Is the NCP1854 Pb-Free and RoHS compliant?
Yes, the NCP1854 is Pb-Free and RoHS compliant.
- How is the I2C interface used in the NCP1854?
The I2C interface is used for programming various parameters such as charge current, charge voltage, and input current limits. It operates up to 3.4 MHz.
