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This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN54020 USB-Compliant Single-Cell Li-Ion Switching Charger with DBP and OTG Boost November 2014 FAN54020 USB-Compliant 1.5 A Single-Cell Li-Ion Switching Charger with DBP and OTG Boost Features Description Fully Integrated, High-Efficiency Charger for Single- The FAN54020 combines a highly integrated switch-mode Cell Li-Ion and Li-Polymer Battery Packs charger, to minimize single-cell Li-Ion charging time from a USB power source, and a boost regulator to power a USB Faster Charging / Less Dissipation than Linear peripheral from the battery. Charger The charging parameters and operating modes are Charge Voltage Accuracy: programmable through an I2C interface. The charger and - 0.5% at 25C boost regulator switch at 3 MHz and utilize the same external components to minimize size. - 1% from -30C to 125C The FAN54020 supports battery charging in three modes: 10% Charge Current Regulation Accuracy pre-charge, constant current fast charger, and constant 28 V Absolute Maximum Input Voltage voltage float charge. 1.5 A Maximum Charge Current To ensure USB compliance and minimize charging time, Support for Dead Battery Provision ( DBP ) of the input current limit can be changed via I2C by the host USB Battery Charging Specification 1.2 processor. Charge termination is determined by a 2 Programmable through I C Interface with Fast Mode programmable minimum current level. A safety timer with (400 kHz) Compatibility reset control provides a safety back-up for the I2C host. Charge status is reported to the host using the I2C port. - Input Current The FAN54020 automatically restarts the charge cycle - Fast-Charge / Termination Current when the battery falls below an internal threshold. Charge current is reduced when die temperature reaches a - Charger (Float) Voltage programmable level, preventing damage. Safety Timer with Reset Control The FAN54020 can operate as a boost regulator on Dynamic Input Voltage Control Automatically command from the system. The boost regulator includes a Reduces Charging Current with Weak Input Sources soft-start that limits inrush current from the battery. Low Reverse Leakage Prevents Battery Drain to The FAN54020 includes Dead Battery Provision (DBP) V BUS from the BC1.2 specification, including a 30 minute timer. Small Footprint 1 H External Inductor The FAN54020 is available in a 25-bump, 0.4 mm pitch, 3.3 V Regulated Output from V for Auxiliary BUS Wafer-Level Chip-Scale Package (WLCSP). Circuits L1 VBUS SW 5 V, 500 mA Boost Mode for USB OTG for 3.0 to 1 H 4.5 V Battery Input 1 F C C BUS OUT PGND 0.1 F Attachment Detect Protocol (ADP) Support per PMID RSENSE CSIN On-The-Go and Embedded Host Supplement to the 68m 4.7 F C MID USB Rev. 2.0 Specification VBAT SDA FAN54020 C BAT SCL LDO SYSTEM 10 F + Applications C LDO LOAD DIS 1F Battery ILIM Cell Phones, Smart Phones D+ DBP Tablet, Portable Media Players POK B STAT Gaming Device, Digital Cameras Figure 1. Typical Application 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN54020 Rev. 1.0.1