AAT2846 Datasheet, PDF (20/25 Pages) Advanced Analogic Technologies – High Current Charge Pump with Dual LDO for Backlight and Flash Applications

Evaluation Board Layout
AAT2846
High Current Charge Pump with Dual LDO
for Backlight and Flash Applications
Figure 6: AAT2846 Evaluation Board
Layout Top Side.
Evaluation Board User Interface
The user interface for the AAT2846 evaluation
board is provided through 4 buttons and a number
of connection terminals. The board is operated by
supplying external power and pressing individual
buttons or button combinations. The table below
indicates the function of each button or button
combination.
To power-on the board, connect a power supply or
battery to the DC- and DC+ terminals. Make the
board's supply connection by positioning the J1
jumper to the ON position. A red LED indicates that
power is applied.
Figure 7: AAT2846 Evaluation Board
Layout Bottom Side.
The evaluation board is made flexible so that the
user can disconnect the enable lines from the
microcontroller and apply external enable signals.
By removing the jumpers from J2, J3, J4 and/or J5,
external enable signals can be applied to the
board. External enable signals must be applied to
pin 1 of each J2, J3, J4 or J5 terminal.
When applying external enable signals, considera-
tion must be given to the voltage levels. The exter-
nally applied voltages cannot exceed the supply volt-
age that is applied to the IN pins of the device (DC+).
The LDO loads can be connected directly to the
evaluation board. For adequate performance, be
sure to connect the load between OUTA/OUTB and
DC- as opposed to some other GND in the system.
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2846.2007.08.1.0