Overview
The LM5017SDE/NOPB is a 100-V, 600-mA synchronous stepdown regulator produced by Texas Instruments. This device is designed to provide efficient and reliable step-down regulation from high input voltages. It features integrated 100-V high-side and low-side MOSFETs, eliminating the need for external Schottky diodes. The LM5017 employs a constant on-time (COT) control scheme, which requires no loop compensation and offers ultra-fast transient response and nearly constant operating frequency. This regulator is well-suited for various industrial and communications applications, including 24-V industrial systems and 48-V communications systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 7.5 to 100 | V |
| Output Current | 600 | mA |
| Output Voltage Adjustability | From 1.225 V | V |
| Feedback Reference Voltage | 1.225 V ± 2% | V |
| Switching Frequency Adjustability | Up to 1 MHz | Hz |
| Operating Junction Temperature Range | -40 to 125 | °C |
| Package Types | WSON-8, SO PowerPAD-8 | |
| Thermal Shutdown | Typically 145°C | °C |
Key Features
- Wide 7.5-V to 100-V input range
- Integrated 100-V high-side and low-side switches
- No Schottky diode required
- Constant on-time control with no loop compensation required
- Ultra-fast transient response
- Nearly constant operating frequency
- Intelligent peak current limit
- Adjustable output voltage from 1.225 V
- Precision 2% feedback reference
- Frequency adjustable up to 1 MHz
- Adjustable undervoltage lockout (UVLO)
- Remote shutdown and thermal shutdown
Applications
- Industrial programmable logic controllers (PLC)
- Smart power meters
- Telecom primary and secondary side bias
- Low-power isolated DC/DC (Fly-Buck™) applications
- 24-V industrial systems and 48-V communications systems
Q & A
- What is the input voltage range of the LM5017?
The input voltage range of the LM5017 is from 7.5 V to 100 V.
- What is the maximum output current of the LM5017?
The maximum output current of the LM5017 is 600 mA.
- Does the LM5017 require an external Schottky diode?
No, the LM5017 does not require an external Schottky diode as it has integrated high-side and low-side switches.
- What is the feedback reference voltage of the LM5017?
The feedback reference voltage of the LM5017 is 1.225 V with a precision of ±2%.
- Can the switching frequency of the LM5017 be adjusted?
Yes, the switching frequency of the LM5017 can be adjusted up to 1 MHz.
- What are the package options for the LM5017?
The LM5017 is available in WSON-8 and SO PowerPAD-8 packages.
- What is the thermal shutdown temperature of the LM5017?
The thermal shutdown temperature of the LM5017 is typically 145°C.
- Does the LM5017 have built-in protection features?
Yes, the LM5017 includes protection features such as intelligent peak current limit, undervoltage lockout (UVLO), and thermal shutdown.
- What are some typical applications of the LM5017?
The LM5017 is used in industrial programmable logic controllers (PLC), smart power meters, telecom primary and secondary side bias, and low-power isolated DC/DC (Fly-Buck™) applications.
- How does the constant on-time control scheme of the LM5017 work?
The constant on-time control scheme of the LM5017 ensures that the on-time is inversely proportional to the input voltage, maintaining a relatively constant operating frequency and eliminating the need for loop compensation.
