August 2013
FAN54300 — USB-Compliant, Dual-Power Input, Single-Cell,
Li-Ion Switching Charger with USB-OTG Boost Regulator
Description
Features
The FAN54300 combines two highly integrated switch-mode
chargers and a boost regulator to minimize single-cell Li-Ion
charging time from a USB and/or auxiliary power source.
. Fully Integrated, High-Efficiency Charger for Single-Cell
Li-Ion and Li-Polymer Battery Packs
. Accepts USB or Dedicated Power Input Source
Charging parameters and operating modes are programmable
through an I2C Bus® interface that operates up to 3.4 Mbps.
The charger and boost regulator circuits switch at 3 MHz to
minimize the size of the external passive components.
. 5 V, 300 mA Boost Mode for USB OTG from 2.5 to 4.5 V
Battery Input
. Charge Voltage Accuracy: 0.5% at TA=25°C
1% from TA=0 to 125°C
The FAN54300 provides battery charging in three phases:
conditioning, constant current, and constant voltage.
. 5% USB Input Current Regulation Accuracy
. 5% Charge Current Regulation Accuracy
. 20 V Absolute Maximum Input Voltage
To ensure USB compliance and minimize charging time, the
USB 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.
. 9.5 V Maximum Input Operating Voltage on VIN Pin,
6.5 V Maximum on VBUS Pin
The 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.
. Up to 1.5 A Maximum Charge Rate
. Programmable Charge and Mode through High-Speed I2C
Interface (3.4 Mb/s) with Fast Mode Plus Compatibility
– Input Current
– Fast-Charge / Termination Current
– Charger Voltage
The FAN54300 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.
– Safety Timer
– Termination Enable
The FAN54300 is available in a 30-bump, 0.4 mm pitch,
wafer-level, chip-scale package (WLCSP).
. 3 MHz Synchronous Buck PWM Controller with Wide Duty
Cycle Range
Applications
. Small Footprint, 1 H, External Inductors
. Safety Timer with Reset Control
. Cell Phones, Smart Phones, PDAs
. Digital Cameras
. Weak Input Sources Accommodated by Reducing
Charging Current to Maintain Minimum VBUS Voltage
. Portable Media Players
. Low Reverse Leakage from Battery Drain to VBUS or VIN
. Programmable LED Drive for Charge Indication
. Register and Slave Addresses Compatible with FAN540X
and FAN542X Families
Ordering Information
Part Number
Temperature Range
Package
Packing
30-Ball, WLCSP, 5x6 Array, 0.4mm Pitch,
586 µm Package Height
FAN54300UCX
-40 to 85°C
Tape and Reel
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN54300 • Rev. 1.0.4