Switching regulator has integrated boost diode
Linear Technology
LT3991 switching regulator
Linear Technology has announced the LT3991, a 1.2A, 55V step-down switching regulator with an integrated boost diode.
Its burst-mode operation keeps quiescent current under 2.8uA in no-load standby conditions and offers ultralow quiescent current, making it suited to applications such as automotive or industrial systems that demand always-on operation and optimum battery life.
The LT3991's 4.3 to 55V input-voltage range makes it suitable for automotive and industrial applications.
Its internal 1.7A switch can deliver up to 1.2A of continuous output current to voltages as low as 1.19V.
Switching frequency is user programmable from 200kHz to 2MHz, enabling the designer to optimise efficiency while avoiding critical noise-sensitive frequency bands.
The combination of its 10-lead 3 x 3mm DFN or thermally enhanced MSOP packages and high switching frequency keep external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT3991 utilises a high-efficiency 1.7A, 440mOhm switch, with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die.
Low-ripple burst-mode operation maintains high efficiency at low output currents while keeping output ripple below 15mVPK-PK.
Design techniques and a high-voltage process enable high efficiency over a wide input-voltage range and the LT3991's current-mode topology enables fast transient response and good loop stability.
Other features include a power good flag, soft-start capability, external clock synchronisation and internal compensation.
The LT3991EDD is packaged in a 3 x 3mm DFN-10, and the LT3991EMSE is packaged in a thermally enhanced MSOP-10.
The LT3991IDD and LT3991IMSE are tested and guaranteed to operate from a -40 to 125C operating junction temperature.
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