AAT3167IFO-T1 Advanced Analog Technology, Inc., AAT3167IFO-T1 Datasheet - Page 10

• Manufacturer Part Number: AAT3167IFO-T1
• Description: High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications
• Manufacturer: Advanced Analog Technology, Inc.

the Max Current register (Register 3) is set to the
Low Current setting, the Low Current register
(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 set 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 100µA for multi-
ple channels or 50µA for Channel 5 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 T
mode and draws less than 1µA from V
Address registers are reset to 0 during shutdown.
AS
10
Address
2
Data
Cwire Serial Interface Addressing
1
2
3
4
0
1
2
3
4
Rising Edges
(see Low Current Register for values)
OFF
EN/SET
, the AAT3167 enters shutdown
17
18
19
20
21
Max Current
Low Current
18mA
27mA
14mA
1&2: D1~D5 Current
1: D1~D4 Current
Data Register
3: Max Current
4: Low Current
2: D5 Current
AAT3167
IN
. Data and
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Low Current Register (Address 4)
Auto-Disable Feature
The AAT3167 is equipped with an auto-disable fea-
ture 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 AAT3167 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.
Data
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
Current On
Main Low
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Current On
Sub Low
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
3167.2007.03.1.4
Current
175µA
280µA
400µA
175µA
280µA
400µA
175µA
280µA
400µA
115µA
115µA
115µA