AAT1401 Datasheet, PDF (14/19 Pages) List of Unclassifed Manufacturers – FOUR-CHANNEL DIGITAL STILL CAMERA POWER SUPPLY

DATA SHEET
AAT1401
Serial LED Driver with Filtered PWM and 32-Step S2C Dimming Control
Rectifier Diode Selection
An external rectifier diode is required for the non-syn-
chronous step-up converter. A low V_F Schottky diode is
recommended. The diode voltage rating should be higher
than the OVP voltage. For an AAT1401 driving 6 white
LEDs with up to 4V forward voltage, the diode voltage
rating should be higher than 24V. Select a diode with DC
rated current equal to the input current to allow an ade-
quate margin for safe use.
Printed Circuit Board
Layout Recommendations
For best performance of the AAT1401, the following
guidelines should be followed when designing the PCB
layout:
1. Make the power trace as short and wide as possible,
including the input/output power lines and switching
node, etc.
2. Make sure the ground bump connected to the print-
ed circuit board with large copper area for better
thermal dissipation.
3. Put the input and output capacitor close to the IC as
close as possible to get the best filter result.
Manufacturer
Diodes
Central
TSC
Part
Number
SDM20U40
SD103BW
CMDSH2-3
SS13L
SS14L
Maximum
DC Blocking
Voltage V_R
(V)
40
30
30
30
40
Maximum
DC Forward
Current I_F
(mA)
250
350
200
1100
1100
Non-repetitive
Peak Forward
Surge Current
I_FSM (A)
1.0
1.5
1.0
30
30
Forward
Voltage
V_F (V)
0.37@20mA
0.37@20mA
0.32@15mA
0.51@0.5A
0.51@0.5A
Case
SOD523
SOD123
SDD323
Sub SMA
Sub SMA
Size WxLxH
(mm)
0.9x1.7x0.65
1.7x3.85x1.35
1.35x2.6x1.0
1.9x3.8x1.43
1.9x3.8x1.43
Table 6: Example of Typical Rectifier Diode.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012