AAT2491 Datasheet, PDF (1/12 Pages) Skyworks Solutions Inc. – Dual N-Channel HV Cascode-Clamp, Lateral TrenchDMOS Array

DATA SHEET
AAT2491
Dual N-Channel HV Cascode-Clamp, Lateral TrenchDMOS Array
General Description
The AAT2491 is a monolithically integrated dual N-channel
high-voltage cascode-clamp lateral TrenchDMOS array.
The dual-channel AAT2491 monolithically integrates
both current-sink (CS) and high-voltage cascode-clamp
(CC) power MOSFETs required for reliably driving a large
series string of LEDs as used in a variety of lighting and
display backlight applications.
The AAT2491’s low-voltage current-sink (CS) device,
required for closed-loop current control in large panel
LED driver applications, is constructed using Skyworks'
robust lateral TrenchDMOS process featuring superior
hot carrier performance needed for reliable constant-
current operation. It has a low on resistance, typically
1.5Ω, facilitating constant current operation over a wide
dynamic range. The low-voltage current-sink Lateral
TrenchDMOS process features a low threshold voltage
(V_GS(ON)) and can be driven directly from a 5V supply.
The high-voltage cascode-clamp TrenchDMOS device has
a drain-to-source voltage rating of 150V. With a 12V gate
drive, it exhibits a typical on-resistance of 5Ω.
In high-voltage LED backlighting applications for TVs and
large-screen LCD panels, the AAT2491 TrenchDMOS
array allows control of two series strings of LEDs with up
to 40 LEDs per string. Each series connected TrenchDMOS
pair comprises a current sink device with its gate active-
ly driven by a backlight driver IC (such as the AAT2430A-1
or the AAT2405).
To facilitate direct temperature measurement of the
AAT2491 in a system, a series connected string of P-N
junction diodes is included with both anode and cathode
connections available separate from the supply.
The AAT2491 is available in a Pb-free, 16-pin SOP-EP
package with 1.27mm pin pitch.
Features
• Low-Voltage Current Sink TrenchDMOS
▪ Low RDS(ON) for Low Dropout Operation
•1.5Ω @ V_{GS = 5V (typical)}
• High-Voltage Cascode-Clamp TrenchDMOS
▪ BVDSS(MAX) = 150V
▪ Low RDS(ON)
•5Ω @ V_GS = 12V (typical)
• Up to 240mA per channel at TA = 25°C
• 16-pin SOP-EP, 1.27mm Pitch Package
• -40°C to +85°C Temperature Range
Applications
 LCD TV Panels
 LCD Monitors
 White LED Backlighting
 High-Voltage LED Lighting
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201934A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 7, 2012
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