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describe
The LMS3635-Q1 and LMS3655-Q1 synchronous buck regulators are optimized for high-performance applications and provide 3.3V, 5V, or adjustable output (1V to 20V) output voltages. Seamless transitions between PWM and PFM modes and low quiescent current ensure high efficiency and excellent transient response at all loads.
Advanced high-speed circuitry enables the LMS3655-Q1 to regulate a 24V input to a 3.3V output at 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 from an input voltage regulation of only 3.5V. Input voltage range up to 36V with transient tolerance up to 42V facilitates easy input surge protection design.
The open-drain reset output has built-in filtering and delay to provide a correct indication of system status. This feature eliminates the need for additional supervisory components, saving cost and board space.
The LMS3635-Q1 and LMS3655-Q1 synchronous buck regulators are optimized for high-performance applications and provide 3.3V, 5V, or adjustable output (1V to 20V) output voltages. Seamless transitions between PWM and PFM modes and low quiescent current ensure high efficiency and excellent transient response at all loads.
Advanced high-speed circuitry enables the LMS3655-Q1 to regulate a 24V input to a 3.3V output at 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 from an input voltage regulation of only 3.5V. Input voltage range up to 36V with transient tolerance up to 42V facilitates easy input surge protection design.
The open-drain reset output has built-in filtering and delay to provide a correct indication of system status. This feature eliminates the need for additional supervisory components, saving cost and board space.
characteristic
• Device Temperature Grade 1: Ambient Operating Temperature Range of –40°C to +125°C
• Human Body Model (HBM) Classification Level 2
• Charged Device Model (CDM) ) Class C6
• 96% Peak Efficiency Converting 12V to 5V
• Low EMI and Minimal 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 Efficiency Improvement
• 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 3.3VOUT with No Load (Typical)
• Output Voltages: 5V, 3.3V and ADJ (1V to 20V)
• ±1.5% Reference Voltage Tolerance
