1 Features
• Input filter and output capacitor ripple-current
cancellation
– Reduced current ripple for higher system
reliability and smaller bulk capacitor
– Reduced EMI filter size
• Phase management capability
• Fail-safe OVP with dual paths prevents output
overvoltage conditions by voltage-sensing failures
• Sensorless current-shaping simplifies board layout
and improves efficiency
• Advanced audible noise performance
• Non-linear error-amplifier gain
• Soft recovery on overvoltage
• Integrated brownout and dropout handling
• Reduced bias currents
• Improved efficiency and design flexibility over
traditional single-phase continuous conduction
mode (CCM)
• Inrush-safe current limiting:
– Prevents MOSFET conduction during inrush
– Eliminates reverse recovery events in output
rectifiers
• Enables use of low-cost diodes without extensive
snubber circuitry
• Improved light-load efficiency
• Fast, smooth transient response
• Expanded system-level protections
• 1A Source/1.8A sink gate drivers
• –40°C to 125°C Operating Temperature Range in
a 16-Lead SOIC Package

2 Applications
• 100-W to 800-W power supplies
• Gaming
• D-to-A set-top boxes
• Adapters
• LCD, Plasma and DLP™ TVs
• Home audio systems

3 Description
Optimized for consumer applications concerned with
audible noise elimination, this solution extends the
advantages of transition mode – high efficiency
with low-cost components – to higher power ratings
than previously possible. By utilizing a Natural
Interleaving™ technique, both channels operate
as masters (that is, there is no slave channel)
synchronized to the same frequency. This approach
delivers inherently strong matching, faster responses,
and ensures that each channel operates in transition
mode.
Expanded system level protections feature input
brownout and dropout recovery, output over-voltage,
open-loop, overload, soft-start, phase-fail detection,
and thermal shutdown. The additional FailSafe
over-voltage protection (OVP) feature protects
against shorts to an intermediate voltage that,
if undetected, could lead to catastrophic device
failure. Advanced non-linear gain results in rapid,
yet smoother response to line and load transient
events. Reduced bias currents improve stand-by
power efficiency. Special line-dropout handling avoids
significant current disruption and minimizes audiblenoise
generation.