DC to DC Power Supplies (Converters)
DC/DC Controller eliminates need for transformer.
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Press Release Summary:
Model LTC3703 is a 100 V, 95% efficient, DC/DC step-down synchronous controller for high input voltage power supplies. Single-inductor design withstands input transients up to 100 V and includes line feed forward compensation. Switching frequency is resistor-adjustable from 100-600 kHz. Applications include conversion of 36-72 V backplane power to 12 or 5 V intermediate supplies in telecom and servers, as well as power supplies susceptible to 90 V surges.
Original Press Release:
100V DC/DC Controller Eliminates Transformer & RSENSE
MILPITAS, CA - February 2, 2004 - Linear Technology Corporation introduces the LTC3703, a 100V, 95% efficient DC/DC step-down synchronous controller for simpler, lower cost and more efficient high input voltage power supplies. The LTC3703 eliminates the need for a transformer and a current sense resistor. This single-inductor design not only withstands input transients up to 100V, but also reduces the effect of input supply transients on the output with its patented line feed forward compensation. The LTC3703's strong onboard 1 Ù gate drivers minimize switching transient losses associated with driving MOSFETs at high frequency. To optimize the size/cost ratio of inductors, MOSFETs and capacitors, the switching frequency is resistor-adjustable from 100kHz to 600kHz. The total solution cost of a LTC3703 power supply design is less than DC/DC bricks with comparable power levels. Applications include conversion of 36V-72V backplane power to 12V or 5V intermediate supplies in telecom and servers, as well as power supplies in automotive and industrial systems susceptible to 90V surges.
The LTC3703 drives N-channel MOSFETs synchronously to achieve high efficiency. Its 0.8V reference voltage is ±1% accurate. The adjustable soft-start guarantees safe start-up by eliminating overshoots. The LTC3703's high bandwidth (25MHz) error amplifier and patented loop compensation provide very fast line and load transient responses that are superior to flyback topologies and existing high voltage DC/DC regulators. Moreover, current limit is user programmable with an external resistor.
The LTC3703 is offered in two package options, 16-lead SSOP and 28-lead SSOP. The IC is rated for the -40°C to 85°C industrial grade temperature range. Pricing for 1,000-piece quantities begin at $3.10 each.
Summary of Features: LTC3703
100V Input Voltage Operation
Large 1 Ù Gate Drivers
No Current Sense Resistor Required
Excellent Transient Response and DC Line Regulation
100kHz to 600kHz Adjustable Frequency
±1% Reference Accuracy
Adjustable Current Limit
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators, power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequency devices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.
