LM5165DRCT

The LM5165 device is an easy-to-use, compact 3V to 65V, ultra-low IQ synchronous buck converter that provides high efficiency over a wide input voltage and load current range. The device features integrated high-side and low-side power MOSFETs and can deliver up to 150mA of output current at a fixed output voltage of 3.3V or 5V or an adjustable output voltage. The converter is designed to simplify implementation while optimizing the performance of target applications. Pulse Frequency Modulation (PFM) mode ensures optimal efficiency under light load conditions, and Constant On-Time (COT) control enables an approximately constant operating frequency. Neither control scheme requires loop compensation and can achieve excellent line and load transient response and short Pulse Width Modulation (PWM) on-time for high step-down conversion ratios. The high-side P-channel MOSFET can operate at a 100% duty cycle to ensure the lowest dropout voltage and does not require a bootstrap capacitor for gate drive. Additionally, the current limit setting can be adjusted to optimize inductor selection to meet specific output current requirements. Optional and adjustable start-up timing options include the shortest delay (no soft-start), an internal fixed value (900µs), and soft-start that can be externally programmed using a capacitor. An open-drain PGOOD indicator can be used for sequencing, fault reporting, and output voltage monitoring. The LM5165 buck converter is available in a 10-pin, 3mm × 3mm thermally enhanced VSON-10 package (0.5mm pin pitch). The LM5165 and LM5165X are also available in a VSSOP-10 package.

Applications

• 4–20mA loop-powered sensors
• Automotive and battery-powered equipment
• High-voltage LDO replacement
• Industrial control systems
• General-purpose bias supply

Key features

• Wide input voltage range: 3V to 65V
• 10.5μA no-load quiescent current
• Junction temperature range: -40°C to 150°C
• Fixed (3.3V and 5V) or adjustable output voltage
• Compliant with EN55022/CISPR 22 EMI standards
• Integrated 2Ω PMOS buck switch with 100% duty cycle support for low dropout
• Integrated 1Ω NMOS synchronous rectifier — no external rectifier diode required
• Programmable current limit setpoint (four levels)
• Selectable PFM or COT mode operation
• 1.223V ±1% internal voltage reference
• 900μs internal or programmable soft-start
• Active slew rate control for low EMI
• Diode emulation mode and pulse-skip mode for ultra-high efficiency at light load
• Monotonic startup into pre-biased output
• No loop compensation or bootstrap components required
• Precision enable and input UVLO with hysteresis
• Pin-to-pin compatible with LM5166
• Thermal shutdown protection with hysteresis
• 10-pin 3mm × 3mm VSON package
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