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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
Fully Integrated, High-Efficiency Charger for Single-
Cell Li-Ion and Li-Polymer Battery Packs
Faster Charging / Less Dissipation than Linear
Charger
Charge Voltage Accuracy:
Description
The FAN54020 combines a highly integrated switch-mode
charger, to minimize single-cell Li-Ion 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. The charger and
boost regulator switch at 3 MHz and utilize the same
external components to minimize size.
The FAN54020 supports battery charging in three modes:
pre-charge, constant current fast charger, and constant
voltage float charge.
To ensure USB compliance and minimize charging time,
the input current limit can be changed via I2C by the host
processor. Charge termination is determined by a
programmable minimum current level. A safety timer with
reset control provides a safety back-up for the I2C host.
Charge status is reported to the host using the I2C port.
The FAN54020 automatically restarts the charge cycle
when the battery falls below an internal threshold. Charge
current is reduced when die temperature reaches a
programmable level, preventing damage.
The FAN54020 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 FAN54020 includes Dead Battery Provision (DBP)
from the BC1.2 specification, including a 30 minute timer.
The FAN54020 is available in a 25-bump, 0.4 mm pitch,
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