Optimized for high-performance applications, the LMS3655NQRNLRQ1 synchronous buck regulator is available with an output voltage of 3.3V or 5V or an adjustable output from 1V to 20V. Seamless transitions between PWM and PFM modes and low quiescent current ensure high efficiency and excellent transient response at all loads.

The LMS3655NQRNLRQ1 advanced high-speed circuit allows the LMS3655-Q1 to regulate a 24V input to a 3.3V output (400kHz fixed frequency) while also supporting 5.5A of continuous load current. An innovative frequency foldback architecture allows the device to generate a 3.3V output with only 3.5V input voltage regulation. The input voltage range can be up to 36V, and the transient tolerance is up to 42V, making it easy to implement input surge protection designs.

The open-drain reset output has built-in filtering and delay to provide proper indication of system status. With this feature, the device eliminates the need for additional monitoring components, which saves cost and board space.

Features:

AEC-Q100 qualified for automotive applications

Device Temperature Grade 1: –40°C to +125°C operating ambient temperature range

Device HBM Classification Level 2

Device CDM Classification Level C6

96% peak efficiency when converting 12V to 5V

Low EMI and ultra-low switch node ringing

400kHz (±10%) fixed switching frequency

-40°C to +150°C Junction Temperature Range

External frequency synchronization

RESET output with internal filter and 3ms release timer

Automatic light load mode for increased efficiency

Pin-Selectable Forced PWM Mode

Built-in compensation, soft-start, current limit, thermal shutdown, and UVLO

0.35V Dropout (Typical) at 3.5A Load at 25°C

18µA IQ_VIN: Quiescent Current at 3.3 VOUT and No Load (typ)

Output Voltage: 5V, 3.3V and ADJ (1V to 20V)

±1.5% reference voltage tolerance