FAN5403 USB-Compliant Single Cell Li-Ion Switching Charger with USB-OTG Boost Regulator0 pages

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)
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