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The LT8609AEMSE is a compact, efficient and high-speed synchronous monolithic step-down switching regulator that consumes only 1.7µV of non-switching quiescent current when the output is stabilised at 5V.The LT8609AEMSE can deliver 3A continuous current. Burst mode operation enables high efficiency, very low output current while maintaining output ripple below 10mVP-P. The SYNC pin allows synchronisation with an external clock or the use of spread spectrum modulation in EMI reduction operation. Internal compensation with peak current mode topology allows the use of smaller inductors for fast transient response and good loop stability. the EN/UV pin has an accurate 1V threshold that can be used to program the VIN UVLO or to turn the part off. a capacitor on the TR/SS pin sets the slope of the output voltage during startup, and the output voltage can be set when VOUT is within ±8.5% of the adjustable output part, or when programmable output voltage is within ±8.5% of the VOUT, or when VOUT is within ±8.5% of the programmable output part, or when VOUT is within ±2.5% of the programmable output part. A capacitor on the TR/SS pin sets the slope of the output voltage during startup, and the PG signals when VOUT is within ±8.5% on an adjustable output part, or within ±7.5% on a fixed output part with a programmable output voltage and a fault condition. The LT8609AEMSE has slower switching chip termination to reduce EMI emissions.

LT8609AEMSE Product Features

Wide input voltage range: 3.0V to 42V

Ultra-low quiescent current Burst Mode® operation:

IQ of 2.5µA with 12VIN regulated to 3.3VOUT

Output ripple < 10mVP-P

Efficient 2MHz synchronous operation:

93% efficiency at 1A, 12VIN for 5VOUT

Maximum continuous output is 3A

Fast minimum switch-on time: 45ns

LT8609A offers fixed 3.3V and 5V outputs

Adjustable and synchronisable: 200kHz to 2.2MHz

Spread Spectrum Frequency (SSFM) for Low EMI

Allows use of small inductors

Low dropout voltage

Peak current mode operation

Precise 1V enable pin thresholds

Internal compensation

Output soft-start and tracking

Certified to AEC-Q100 for automotive applications

LT8609AEMSE Product Applications

GSM transceivers

General Purpose Buck Converter

Low EMI Buck

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