FAN5403 USB-Compliant Single Cell Li-Ion Switching Charger with USB-OTG Boost Regulator - Fairchild Semiconductor - #1

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November 2010 © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5400 Family • Rev. 1.0.2 FAN5400 Family— USB-Compliant Single-Cell Li-Ion Switching Charger with USB-OTG Boost Regulator FAN5400 Family USB-Compliant Single-Cell Li-Ion Switching Charger with USB-OTG Boost Regulator Features .. Fully Integrated, High-Efficiency Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs .. Faster Charging than Linear .. Charge Voltage Accuracy: ±0.5% at 25°C ±1% from 0 to 125°C .. ±5% Input Current Regulation Accuracy .. ±5% Charge Current Regulation Accuracy .. 20V Absolute Maximum Input Voltage .. 6V Maximum Input Operating Voltage .. 1.25A Maximum Charge Rate .. Programmable through High-Speed I2C Interface (3.4Mb/s) with Fast Mode Plus Compatibility – Input Current – Fast-Charge / Termination Current – Charger Voltage – Termination Enable .. 3MHz Synchronous Buck PWM Controller with Wide Duty Cycle Range .. Small Footprint 1ìH External Inductor .. Safety Timer with Reset Control .. 1.8V Regulated Output from VBUS for Auxiliary Circuits .. Weak Input Sources Accommodated by Reducing Charging Current to Maintain Minimum VBUS Voltage .. Low Reverse Leakage to Prevent Battery Drain to VBUS .. 5V, 300mA Boost Mode for USB OTG for 2.5 to 4.5V Battery Input Applications .. Cell Phones, Smart Phones, PDAs .. Tablet, Portable Media Players .. Gaming Device, Digital Cameras Description The FAN5400 family (FAN540X) combines a highly integrated switch-mode charger, to minimize single-cell Lithium-ion (Liion) charging time from a USB power source, and a boost regulator to power a USB peripheral from the battery. The charging parameters and operating modes are programmable through an I2C Interface that operates up to 3.4Mbps. The charger and boost regulator circuits switch at 3MHz to minimize the size of external passive components. The FAN540X provides battery charging in three phases: conditioning, constant current, and constant voltage. To ensure USB compliance and minimize charging time, the input current is limited to the value set through the I2C host. Charge termination is determined by a programmable minimum current level. A safety timer with reset control provides a safety backup for the I2C host. The integrated circuit (IC) automatically restarts the charge cycle when the battery falls below an internal threshold. If the input source is removed, the IC enters a high-impedance mode with leakage from the battery to the input prevented. Charge status is reported back to the host through the I2C port. Charge current is reduced when the die temperature reaches 120°C. The FAN540X can operate as a boost regulator on command from the system. The boost regulator includes a soft-start that limits inrush current from the battery. The FAN540X is available in a 1.96 x 1.87mm, 20-bump, 0.4mm pitch WLCSP package. FAN540X SW PGND COUT L1 VBAT CSIN + Battery RSENSE 68mÙ 1ìH CSYSTEM BAT LOAD 0.1ìF VBUS 1ìF PMID 4.7ìF SDA SCL OTG/USB# CREG 1ìF VREG STAT DISABLE 10ìF CBUS CMID Figure 1. Typical Application (FAN5403-05 Pinout) All trademarks are the property of their respective owners.