AAT3689 データシートの表示（PDF） - Advanced Analogic Technologies

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AAT3689

0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger

Advanced Analogic Technologies 

AAT3689

0.5A/1.0A USB Port/Adapter

Lithium-Ion/Polymer Battery Charger

Application Information

AC Adapter / USB System Power Charging

Adapter Mode

In the adapter mode, constant current charge lev-

els up to 1.0A may be programmed by the user.

The AAT3689 system control will always select the

adapter input over the USB supply input whenever

adapter voltage is present on the ADP pin. The

AAT3689 will operate from the adapter input over a

4.0V to 5.5V range.

The constant current fast charge current for the

adapter input mode is set by the RSETADP resistor

connected between the ADPSET pin and ground.

Refer to Table 1 for recommended RSETADP values

for a desired constant current charge level. The

precise charging function in the adapter mode may

be read from the status LEDs. Please refer to the

Battery Charge Status Indication discussion in this

datasheet for further details.

Adapter Input Charge Inhibit and Resume

The AAT3689 has an under-voltage lockout and

power on reset feature so that if the input supply to

the adapter pin drops below the UVLO threshold

the charger will suspend charging and shut down.

When power is re-applied to the adapter pin or the

UVLO condition recovers and VADP > VBAT, the sys-

tem charge control will assess the state of charge

on the battery cell and will automatically resume

charging in the appropriate mode for the condition

of the battery.

USB Mode

The AAT3689 provides an input for intelligent USB

charging. When no voltage is present on the

adapter input pin, the charge controller will auto-

matically switch to accepting power from the USB

input. The USB charge may be user programmed

to any level between 50mA and 500mA by select-

ing the appropriate resistor values for RSETUSB.

Refer to Table 1 for recommended RSETUSB values

for the desired USB input constant current charge

levels.

3689.2006.11.1.0

ICC

50

75

100

200

300

400

500

600

700

800

900

1000

ADP

RSET (kΩ)

N/A

N/A

84.5

43.2

28.0

21.0

16.9

13.3

11.5

10.2

9.09

8.06

USB

RSET (kΩ)

86.6

57.6

42.2

21.0

13.7

10.2

8.06

N/A

N/A

N/A

N/A

N/A

Table 1: Resistor Values.

USB Input Charge Inhibit and Resume

The AAT3689 UVLO and power on reset feature

will function when the USB input pin voltage level

drops below the UVLO threshold. At this point, the

charger will suspend charging and shut down.

When power is re-applied to the USB pin or the

UVLO condition recovers, the system charge con-

trol will assess the state of charge on the battery

cell and will automatically resume charging in the

appropriate mode for the condition of the battery.

Enable / Disable

The AAT3689 provides an enable function to con-

trol the charger IC on and off. The enable (EN) pin

is active high. When pulled to a logic low level, the

AAT3689 will be shut down and forced into the

sleep state. Charging will be halted regardless of

the battery voltage or charging state. When the

device is re-enabled, the charge control circuit will

automatically reset and resume charging functions

with the appropriate charging mode based on the

battery charge state and measured cell voltage.

Programming Charge Current

The fast charge constant current charge level for

both Adapter and USB input modes are pro-

grammed with set resistors placed between the

ADPSET and USBSET pins and ground. The accu-

racy of the fast charge is dominated by the toler-

ance of the set resistor used. For this reason, 1%

13

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