AAT4900_06 ANALOGICTECH [Advanced Analogic Technologies], AAT4900_06 Datasheet - Page 7

• Manufacturer Part Number: AAT4900_06
• Description: Buffered Power Half-Bridge
• Manufacturer: ANALOGICTECH [Advanced Analogic Technologies]

Functional Block Diagram
Typical Applications
DC/DC Converter
The most common AAT4900 applications include a
DC/DC converter output power stage and a MOS-
FET gate drive buffer.
Figure 1 shows a common configuration when used
as a DC/DC converter power stage with synchro-
nous rectification. The enable pin can be used to
4900.2006.05.1.3
GND
V
IN
= 2.0 to 5.5V
Controller
DC / DC
CLK
EN
Figure 1: AAT4900 DC/DC Converter Power Stage.
Shoot-Through
Control Logic
Protection
EN
CLK
AAT4900
GND
and
IN
LX
force the LX output to a high impedance state under
light load conditions. This enables the output induc-
tor to operate in discontinuous conduction mode
(DCM), improving efficiency under light load condi-
tions. The body diode associated with the low side
switching device gives the AAT4900 inductive
switching capability, clamping the LX node at a
diode drop below GND during the break-before-
make time.
Buffered Power Half-Bridge
GND
IN
V
I
OUT
OUT
= 0 to 1A
= 0 to V
+
LX
-
IN
AAT4900
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