Diodes AUR9807 - Manual

Data Sheet
Single-cell Li-Ion Charger IC with System Power Management AUR9807
Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
1
General Description
The AUR9807 is a single-cell Li-ion charger IC with
system power management feature. It charges the
battery and power the system simultaneously. The
maximum charging current (up to 1.5A) is set by
external resistor for fast charging. The output
voltage for the system is regulated to a nominal
value (three different versions available: 4.4V, 5V or
6V); the actual value of the output voltage depends
on the input voltage from the adapter, the charging
current and the system loading. With the decrease of
the input voltage or the increase of the system
loading current, the output voltage drops. When the
output voltage drops to a predetermined value
(V
APM-REG
), the Active Power Management function
is activated and tries to maintain the output voltage
at V
APM-REG
; the AUR9807 will suffice the system
loading with first priority and reduce the charging
current temporarily, i.e. under heavy load condition,
the AUR9807 charges the battery with the remaining
available current to keep the output voltage at V
APM
.
In this manner, the charge and discharge cycle of the
battery can be reduced.
It is possible that the AUR9807 fails to maintain the
output voltage at V
APM-REG
; for example, when the
system loading current exceeds the capability of the
current-limiting AC adapter. In this scenario, the
output voltage drops to the battery voltage, and the
system is allowed to draw current from the battery.
The AUR9807 is available in QFN-4.5×3.5-20
package.
Features
• QFN Package
• Active Power Management (APM) for
Simultaneously Powering the System and
Charging the Battery
• Total Current Supported Up to 2 Amperes
(System Loading Having Higher Priority on the
Budget)
• Automatic Power Source Selection (AC Adapter
or Battery)
• 40mΩ Power Path for the Battery to Supply the
System Power Efficiently
• Junction Temperature Detection and Thermal
Regulation During Charging Process
• External LED Indicating Charger and Power
Good Status as Well as Fault Condition
• Thermal, Short-Circuit, and Reverse Current
Protection
• Short-Circuit Protection in the Low Power
Consumption Sleep Mode
• SYSOFF Function to Cut Off the Path Between
the System and the Battery
• Built-in Over Voltage Protection up to 18V
Applications
• Battery-Powered Devices or Equipment
• Mobile Phones, Digital Cameras and MP3
Players
• Radios, Other Hand-Held Games and Instruments
• Solar Power System
Figure 1. Package Type of AUR9807
QFN-4.5Ч3.5-20