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Step down regulator delivers 93% efficiency

Linear Technology has announced the LT8630 – a 600mA synchronous step-down switching regulator. Its 3 to 100V input voltage range is claimed to make it suitable for 48V automotive systems, dual battery transportation, industrial and 36 to 72V telecom applications.

Synchronous rectification is said to deliver up to 93% efficiency while Burst Mode operation keeps quiescent current under 7µA in no load standby conditions. Its internal switches can deliver up to 600mA of continuous output current to voltages as low as 0.8V.

The LT8630 maintains a minimum dropout voltage, enabling it to operate with duty cycles of up to 99%. Its variable frequency boundary mode switching topology is claimed to offer high efficiency over a range of input voltages.

The device uses internal top and bottom power switches with the 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 5mVP-P.

Other features include short-circuit protection, a power good flag, output voltage tracking and thermal protection.

The LT8630EFE is packaged in a thermally enhanced TSSOP-20 package with high voltage lead spacing. An industrial temperature version, the LT8630IFE, is tested and guaranteed to operate in temperatures from –40 to 125°C.

Additional features:

• Output voltage range: 0.8V to 60V

• Low ripple Burst Mode operation: 16µA IQ at 12VIN to 5VOUT and 7µA IQ at 48VIN to 5VOUT

• Peak current mode control

• Programmable undervoltage lockout

• Low shutdown current: 5µA

• Tolerates pin open/short faults

Peggy Lee

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