Analog Devices Inc. LT8644S DC-DC Converters

Analog Devices Inc. LT8644S DC-DC Converters are monolithic, constant frequency, and current-mode step-down converters. These converters feature second-generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. The LT8644S DC-DC converters operate at the 1.5V to 8V PV_IN range and 0.6V to VIN V_OUT range. These converters provide 300kHz to 3.5MHz adjustable/synchronizable frequency range and 20ns fast minimum switch on-time.

The LT8644S DC-DC converters operate in the Forced Continuous Mode (FCM) for fast transient response and full frequency operation over a wide load range. These converters operate in the burst mode for low standby current consumption. The LT8644S DC-DC converters can be used in the applications such as automotive and industrial supplies and general-purpose step-down conversion.

Features

Silent Switcher 2 architecture
Ultralow EMI emissions on any PCB
Internal bypass capacitors reduce radiated EMI
Optional spread spectrum modulation
High efficiency at high frequency
Up to 12 phases polyphase operation
Fast transient response with external compensation
Up to 94% efficiency at 2MHz, 3.3V_IN to 1.2V_OUT

Up to 93% efficiency at 2MHz, 5V_IN to 1.2V_OUT
Forced Continuous Mode (FCM) operation
Low quiescent current burst mode operation
Output soft-start and power good
Small 24-lead 4mm × 4mm LQFN package
AEC-Q100 qualified for automotive applications

Specifications

1.5V to 8V PV_IN range
2.7V to 8V SV_IN range
0.6V to V_IN V_OUT range
300kHz to 3.5MHz adjustable and synchronizable frequency range

Low quiescent current burst mode operation:
- <10mVoutput ripple
- 180µA IQ regulating 5V_IN to 1.2V_OUT
20ns fast minimum switch on-time

Applications

Automotive and industrial supplies
General-purpose step-down conversion

Analog Devices Inc. LT8644S DC-DC Converters

Features

Specifications

Applications

Block Diagram

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