Dual Output DC/DC Controller boosts power and reliability.
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Press Release Summary:
Exhibiting up to 95% efficiency, LTC3869/-2 synchronous, step-down DC/DC controller can maintain better than ±4% current mismatch between channels during steady state and transient conditions when both outputs are paralleled. Onboard 1.1 ohm gate drivers minimize switching losses and allow use of external MOSFETs to produce output currents to 25 A per channel with output voltages from 0.6-12.5 V. Operating from 4-38 V, IC maintains jitter-free performance even when switching edges cross between phases.
Original Press Release:
Dual Output Synchronous Step-Down DC/DC Controller with Excellent Channel-to-Channel Current Sharing Boosting Power & Reliability
MILPITAS, CA - Linear Technology Corporation introduces the LTC3869/-2, a dual output high efficiency (up to 95%) synchronous step-down DC/DC controller with well balanced current sharing between channels when paralleled. This controller can maintain better than +/-4% current mismatch between channels during steady state and transient conditions when both outputs are paralleled due to its low 2mV sense voltage maximum mismatch. The device's 4V to 38V input range encompasses a wide variety of applications, including most intermediate bus voltages and battery chemistries. The powerful 1.1Ohm onboard gate drivers minimize switching losses and allow the use of high power external MOSFETs to produce output currents up to 25A per channel with output voltages ranging from 0.6V to 12.5V. This device maintains superior jitter-free performance even when the switching edges cross between phases, ideal for noise sensitive requirements. Applications include ASIC and FPGA supplies, power distribution, network servers and automotive power systems.
The LTC3869/-2's current-mode control and minimum on-time of just 90ns make it ideal for high frequency, high step-down ratio applications requiring a small solution size. Tracking and sequencing functions optimize power-up and power-down of multiple power rails. This device operates with all N-channel MOSFETs and produces ± 1% accurate output voltages over a wide -40°C to 125°C operating junction temperature range. The output current is sensed by monitoring the voltage drop across the output inductor (DCR) for highest efficiency or by using a sense resistor. A fixed operating frequency can be programmed from 250kHz to 780kHz or can be synchronized to an external clock with its internal phase-locked loop (PLL). Additional features include an onboard LDO for IC power, programmable soft start, a power good signal and external VCC control.
The LTC3869 is pin compatible to the LTC3850 in both package options. The LTC3869 is available in a 4mm x 5mm QFN package and the LTC3869-2 is offered in an SSOP-28. The 1000-piece price starts at $2.65 each. Both versions are available from stock. For more information, visit http://www.linear.com/product/LTC3869
Summary of Features: LTC3869/-2
About Linear Technology
Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for three decades. The Company's products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, and µModule® subsystems.
LT, LTC, LTM, µModule and are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.
Worldwide Contacts
North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
