Step-Down Regulator delivers 4 A with voltage tracking.
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Press Release Summary:
Housed in 20-lead, thermally enhanced TSSOP package, LTC3416 synchronous buck regulator uses constant frequency, current mode architecture. It offers voltage tracking for supply sequencing and delivers up to 4 A continuous output current at voltages down to 0.8 V. It operates from 2.25-5.5 V input voltage and has programmable switching frequency from 300 kHz to 4 MHz. Utilizing internal switches with RDS(ON) of 0.067 ohms, product delivers efficiencies to 95%.
Original Press Release:
4MHz Synchronous Step-Down Regulator Delivers 4A with Tracking in Less than 300mm²
MILPITAS, CA - April 22, 2004 - Linear Technology Corporation announces the LTC3416, a 95% efficient synchronous buck regulator, which uses a constant frequency, current mode architecture. The LTC3416 also offers voltage tracking for easy supply sequencing. It can deliver up to 4A of continuous output current at voltages as low as 0.8V from a thermally enhanced TSSOP-20 package. It operates from an input voltage of 2.25V to 5.5V, making it ideal for both single cell Li-Ion, or NiMH applications, as well as more general purpose fixed rail systems. Its switching frequency is programmable from 300kHz to 4MHz via a single resistor, ensuring optimal efficiency and allowing the use of tiny low cost capacitors and inductors with less than 1.5mm profile. Constant frequency operation also keeps switching noise out of critical wireless and xDSL frequency ranges, making it ideal for xDSL modem, cellular basestation and automotive applications.
The LTC3416 uses internal switches with an RDS(ON) of only 0.067 Ohms to deliver efficiencies as high as 95%. It also utilizes low dropout 100% duty cycle operation to allow output voltages up to VIN. The LTC3416 operates in forced continuous mode and provides tracking of another power supply rail, yet minimizes no load quiescent current to only 300uA, and less than1uA in shutdown. Furthermore, forced continuous operation reduces noise and RF interference while providing excellent transient response. Fault protection is provided by an overcurrent comparator and adjustable loop compensation allows the transient response to be optimized over a wide range of loads and output capacitance.
The LTC3416 is available from stock in a 20-lead, thermally enhanced TSSOP package. Pricing starts at $5.20 each in 1,000-piece quantities.
Summary of Features: LTC3416
High Efficiency: Up to 95%
IOUT up to 4A
Programmable Output Voltage Tracking
VIN Range of 2.25V to 5.5V
VOUT Range of 0.8V- VIN
Low Quiescent Current: 300uA with No Load, <1uA in Shutdown
4MHz Constant Frequency Operation with Burst Mode®
+2% Output Voltage Accuracy
20-Lead, Thermally Enhanced TSSOP Package
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 frequencydevices. 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.
Note: LT, AND LTC are registered trademarks of Linear Technology Corp.
