Diodes AUR9807 User Manual download pdf

Data Sheet

Single-cell Li-Ion Charger IC with System Power Management AUR9807

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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

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)

• 40m 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-4.5×3.5-20

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