Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3709
Edited by the Electronicstalk Editorial Team on 17 March 2005
Controller boasts speedy transient
response
The LTC3709 is a two-phase step-down synchronous DC/DC controller with fast transient response which eliminates voltage errors introduced by PCB traces and high load currents.
Available now from Linear Technology, the LTC3709 is a two-phase step-down synchronous DC/DC controller with fast transient response which eliminates voltage errors introduced by PCB traces and high load currents An integrated differential amplifier measures the output voltage directly at the load and compensates for voltage drop error
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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It also rejects common mode signals that are capacitively or inductively coupled into the feedback pin through PC traces.
With a 100ns on-time, the LTC3709 responds very quickly to load transients and reduces the size of output capacitors.
The IC uses on-chip phase-lock loops to achieve phase separation between the two output channels and locking onto an external clock.
The LTC3709 can deliver up to 40A to loads as low as 0.6V with fewest input and output capacitors.
The LTC3709 is used in applications such as servers, large memory arrays, industrial single-board computers and control systems.
The LTC3709 is a current mode step-down synchronous controller that drives N-channel MOSFETs.
The user has the option of designing with sense resistors to optimise current balancing or without them to improve efficiency and reduce solution cost.
For proper startup of a system with multiple DC/DC regulators, a track input pin allows the output voltage of the LTC3709 to track the output of other regulators.
The LTC3709 operates from 4 to 30V input supplies and uses a constant on-time, valley current control architecture to deliver very low duty cycles.
For example, the LTC3709 can operate from 2 to 90% duty cycle at 200kHz in to convert input voltages ranging from 4.5 to 28V to low 2.5V output.
The IC offers fault protection against output overvoltage and short-circuit conditions.
The LTC3709 is housed in two packages of 5 x 5mm QFN and 36-lead SSOP.
The LTC3709 is rated for operation from -40 to +85C.
1000-piece price starts at $4.90. Request a free brochure from Linear Technology Corp ...
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