Linear unveils 1.2A step-down switching regulator
Linear Technology has introduced a 1.2A, 37VIN step-down switching regulator.
The LT3686 operates within a VIN range of 3.6V to 37V with overvoltage lockout, protecting the regulator and load from transients as high as 55V, making it suitable for the load-dump and cold-crank conditions found in automotive applications and 24V industrial supplies.
Linear Technology has announced the LT3686, a 1.2A, 37VIN step-down switching regulator
Its internal 1.85A switch can deliver up to 1.2A of continuous output current at voltages as low as 0.8V.
Its low minimum on-time enables it to offer high switching frequencies, even with high step-down ratios.
For example, with an input as high as 16V, it can deliver a 3.3V output using a 2MHz switching frequency.
The LT3686's switching frequency is user programmable from 300kHz to 2.5MHz, enabling designers to maximise efficiency while avoiding critical noise-sensitive frequency bands.
The regulator maintains constant frequency switching, even in very light-load conditions.
The device's 3 x 3mm DFN-10 package and high switching frequency, which keeps the external inductor and capacitors small, provides a compact, thermally efficient footprint.
The LT3686 utilises a 1.85A, 680mV switch with the necessary boost diode, oscillator, control and logic circuitry integrated into a single chip.
Its catch diode current sense (DA pin) protects the circuit during input-voltage transients, even at high switching frequencies.
Special design techniques used in the LT3686 enable high efficiency over a wide input-voltage range and the device's current-mode topology enables fast transient response and excellent loop stability, according to the company.
Other features include a tracking capability, internal compensation and a soft-start capability.
Pricing for the LT3686EDD starts at USD2.50 (GBP1.60) each for 1,000-piece quantities.
An industrial-grade version, the LT3686IDD, is guaranteed to operate from a -40C to +125C operating junction temperature and is priced at USD2.78.
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