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FAN54013BUCX

USB-Compliant Single-Cell Li-Ion Switching Charger with USB-OTG Boost Regulator

Fairchild Semiconductor 

July 2012

FAN54010 / FAN54011 / FAN54012 / FAN54013 / FAN54014

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

 20 V Absolute Maximum Input Voltage

 6 V Maximum Input Operating Voltage

 1.45 A Maximum Charge Rate

 Programmable through High-Speed I2C Interface

(3.4 Mb/s) with Fast Mode Plus Compatibility

– Input Current

– Fast-Charge / Termination Current

– Charger Voltage

– Termination Enable

 3 MHz Synchronous Buck PWM Controller with Wide

Duty Cycle Range

 Small Footprint 1H External Inductor

 Safety Timer with Reset Control

 1.8 V 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

 5 V, 500 mA Boost Mode for USB OTG for 3.0 V to

4.5 V Battery Input

Description

The FAN54010 family (FAN5401X) combines a highly

integrated switch-mode charger, to minimize single-cell Lithium-

ion (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 that operates up to

3.4 Mbps. The charger and boost regulator circuits switch at

3MHz to minimize the size of external passive components.

The FAN5401X 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 FAN5401X 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 FAN5401X is available in a 1.96 x 1.87 mm, 20-bump,

0.4 mm pitch, WLCSP package.

Applications

 Cell Phones, Smart Phones, PDAs

 Tablet, Portable Media Players

 Gaming Device, Digital Cameras

All trademarks are the property of their respective owners.

Figure 1. Typical Application

© 2011 Fairchild Semiconductor Corporation

FAN5401X Family • Rev. 1.0.4

www.fairchildsemi.com

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