L6740L
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L6741
Product Page
L6743
Product Page
L6743Q
Product Page
The L6740L dual PWM multi-phase controller, together with the Power
MOSFET driver L6741, L6743 or L6743Q, realizes the first “hybrid”
solution on the market for the power management of the new AMD desktop
and server processors.
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Compliant with dual-plane supply and serial communication
interface (SVI) of next platforms, the controller is also compatible
with actual CPUs using single-plane supply and parallel interface
(PVI), allowing the design of hybrid motherboards. The drivers are
compatible with the existing standard controllers, allowing them
to be used in a wider range of applications.
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Advanced Features
And High Flexibility |
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L6740L embeds two independent controllers for the CPU core and the
integrated North-Bridge, each one with its own set of protection.
The device performs singlephase control for the NB section and up
to 4 phase control for the core section. Its architecture allows
a fast load-transient response, reducing the output filter, and
consequently minimizing the total cost. New patent pending PWM techniques,
together with a full set of features covering the CPU specifications
and fulfilling the new trend in power saving, make this device ideal
for computing, datacom, telecom and storage markets.
L6741, L6743 and L6743Q offer a selection of MOSFET drivers, in
SO-8 and DFN10 3x3 mm packages, suitable for use in desktop computers,
servers, low voltage power conversions, suitable for thermally enhanced
applications. Their high current driving capability allows applications
from just a few Amps to over 35 Amps per phase, from both 5 V and
12 V buses.
Since the bootstrap diode is embedded, the external part count is
lowered. The adaptive dead-time control minimizes the low-side body
diode conduction time, improving the system efficiency. The preliminary
OV protection saves the load in case of high-side Power MOSFET failures.
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Drivers’ Key
Characteristics |
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Part number
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Package
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Enable
pin
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SO-8 |
No (automatic) |
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Yes |
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DFN10 3x3 mm |
Yes |
Microprocessors and Digital Signal Processors
Memories and terminations
High density DC-DC converters
PVI and SVI automatic compatibility
2 to 4 phases for CPU core, 1 phase for NB
High current Power MOSFET drivers, with adaptive dead-time management
and preliminary OV protection
Dual-edge asynchronous architecture with Load Transient Boost TechnologyTM
PSI flag management to increase efficiency in light-load conditions
Dual over-current protection: Average and Per-phase
Load indicators
Load-line voltage positioning
Dual differential remote sense
Adjustable independent reference offset
Feedback disconnection protection
Programmable OV protection
Adjustable switching frequency, up to 1 MHz
Pre-biased load management
L674x simplified application schematic |
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