AAT2491 Datasheet, PDF (9/12 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
Functional Block Diagram
CD1
CD2
OT _B
Temp
Sensor
OT _E
CG1,2
●
●
●
CS_D1
●
CS_D2
●
CS_G1
●
CS_S1
CS_G2
●
CS_S2
GND
Functional Description
The AAT2491 is a dual cascode-clamp current sink
MOSFET used to both protect and control the current in
a series string of LEDs used in LCD backlighting applica-
tions. Replacing four discrete transistors, the AAT2491
comprises four lateral TrenchDMOS transistors in a popu-
lar SOP-EP-16 package with 1.27mm pin pitch.
The AAT2491 utilizes lateral TrenchDMOS transistors,
which are avalanche-rugged, robust power devices, fab-
ricated using Skyworks' patented ModularBCD process
technology to integrate the transistor array. Lateral
TrenchDMOS transistors exhibit hot carrier reliability
superior to conventional surface MOSFET devices. All
gate pins include ESD protection diodes but to avoid pos-
sible damage by a surge voltage on the high voltage
cascode-clamp MOSFET gate, it is recommended to put
a 1kΩ, or greater, series resistor between the power sup-
ply and the gate pin. (In case of using resistor divider to
supply the voltage for the gate bias, the upper resistance
will work as a series resistance.) The CG pin is also
required to have a bypass capacitor (greater than or
equal to 1nF) to the ground.
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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