AAT3169 datasheet(10/14 Pages) AAT

10 / 14 page

AAT3169

High Efficiency 1X/1.5X/2X Charge

Pump for White LED Applications

3169.2006.08.1.2

The maximum current level is determined by the

value set in Register 3, the Max Current register.

Three scales are available for high operating cur-

rents with maximum current levels of 30mA, 20mA,

or 15mA.

Each scale maintains approximately

1.8dB steps between settings. A separate mode is

available for ultra-low LED current operation.

When the Max Current register (Register 3) is set

to the Low Current setting, the Low Current regis-

ter (Register 4) must be programmed. The two

most significant bits of the Low Current register

control whether or not a given bank of current sinks

is enabled. The least two significant bits of the Low

Current register sets the current level for both

banks. For low current settings, the charge pump

may be enabled if required by the battery voltage

and LED forward voltage conditions, and 1X mode

quiescent current is approximately 130µA for multi-

ple channels or 65µA for Channel 6 operation only.

Both banks of current sinks must be in the same

high or low current mode of operation.

When EN/SET is held low for an amount of time

greater than TOFF, the AAT3169 enters shutdown

mode and draws less than 1µA from the input.

Data and Address registers are reset to 0 during

shutdown.

AS2Cwire Serial Interface Addressing

Low Current Register (Address 4)

Auto-Disable Feature

AAT3169 is equipped with an auto-disable feature

for each LED channel. After the IC is enabled and

started up, a test current of 120µA (typical) is

forced through each sink channel. The channel will

be disabled if the voltage of that particular SINK pin

does not drop to a certain threshold. This feature is

very convenient for disabling an unused channel or

during an LED fail-short event.

Thermal Protection

The AAT3169 has a built-in thermal protection cir-

cuit that will shut down the charge pump if the die

temperature rises above the thermal limit, as would

be the case during a short circuit of the OUTCP pin.

Main Low

Sub Low

Data

Current On

Current

1No

2No

3No

4No

Yes

115µA

Yes

175µA

Yes

280µA

Yes

400µA

Yes

115µA

Yes

175µA

Yes

280µA

Yes

400µA

Yes

115µA

Yes

175µA

Yes

280µA

Yes

400µA

Data

Max Current

20mA

30mA

15mA

Low Current

(see Low Current Register for values)

EN/SET

Data Register

Address

Rising Edges

AAT3169

1&2: D1~D6 Current

1: D1~D5 Current

2: D6 Current

3: Max Current

4: Low Current

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