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Transcript
Analog Solutions—Robust Reliable Performance BC3770 The most flexible battery charger in the industry Overview The growing demand for remote intelligence for end users is driving the adoption of products with higher autonomy and battery efficiency. Product manufacturers are placing more Target Applications • Internet of Things (IoT) importance on batteries to be easily and quickly charged without disturbing the end user • Handheld consumer devices experience. Supporting a dual power path, the Freescale’s BC3770 battery charger has been designed to • Wearable market operate while charging the battery. Combined with the adaptive input current limiting feature, • PoS terminals the BC3770 optimizes a dynamic share between the battery and the system. To optimize • Medical portable equipment battery lifetime and enable a full charge, the BC3770 features high voltage accuracy over the full temperature range due to the different charging process (constant current, constant voltage and trickle mode) controlled by the I2C bus. As safety is an important requirement for battery manufacturers, the BC3770 encompasses a set of protection such as thermal regulation and protection as prime examples to avoid damaging any downstream components. Supporting 1.5 MHz switching capabilities combined with a small component count make the BC3770 perfect for system cost optimizations. BC3770 Simplified BlockDrawing Diagram BC3770 Simplified Application BC3770 USB/TA VBUS DD+ ID GND Current Detect and Control VBUS MUIC PMID PGND BOOT VL PWM Driver GND System I/O VIO Push-Pull Block System LX 1.5 MHz Microprocessor VSYS AP_INT nINT AP_SDA SDA SCL AP_SCL GPIO GPIO ADC_INPUT I2C Interface Charger En Protection GPIO nCHGEN GPIO nSHDN Thermal Reg 100º 150º Thermal Shutdown Buck PWM CC, CV Register I2C Interface Control Block FET Bat Reg CHGOUT Bat Sense No Bat Weak Bat BATREG Optional Trickle Pre-Charge + BATSNSN NOBAT VF 1-Cell Li-Ion Battery • Consumer tablets Features: Benefits: • 20 V maximum protection input voltage • Programmable architecture to meet • Up to 2 A load current for the system or the battery • Single cell Li-ion and Li-polymer battery support • Dual output to both charge the battery and run the use case • +/- 1% voltage accuracy over full temperature range • +/- 0.5% voltage accuracy at 25º C • Programmable interface to monitor the different charging modes Freescale: A Leader in Analog Solutions different modes of operation (charging and power management) Expanding on more than 30 years of innovation, Freescale is a leading provider • Dual output solution to meet both the of high-performance products that use SMARTMOS technology combining digital, charging and use case • Dynamically share current between the application and battery upon current power and standard analog functions. Freescale supplies analog and power management ICs that are advancing the demand automotive, consumer, industrial and • Set of protection features to avoid networking markets. Analog solutions damaging the downstream components • Lower BOM cost to reduce PCB space, interface with real world signals to control and drive for complete embedded systems. board complexity and system cost Constant current charge Constant voltage charge Trickle mode • 1.5 MHz switching frequency • 400 kHz I2C interface • Boost mode operation for USB OTG Documentation Freescale Document Number Title Description BC3770 Battery Chargers Data Sheet SG1002 Analog Product Selector Guide Selector Guide SG200 Industrial Product Selector Guide Selector guide • Different types of protection (thermal protection, thermal regulation, etc.) • 25-bump 2.27 mm x 2.17 mm WLCSP package • -40º C to 85º C temperature range support Developments Tools Freescale Document Number Description FRDM-BC3770-EVB Evaluation board compatible with the Freescale Freedom Development Platform to demonstrate the key features of the BC3770 FRDM-KL25Z Freescale Freedom Development Platform for Kinetis MCUs used to enable the BC3770 evaluation board For more information about Freescale products, please visit freescale.com/analog Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. SMARTMOS is a trademark of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © 2015 Freescale Semiconductor, Inc. Document Number: BC3770FS REV 1