7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator
Product details
Parameters
Package | Pins | Size
Features
- Wide 7.5-V to 100-V Input Range
- Integrated 100-V High-Side,
and Low-Side Switches - No Schottky Required
- Constant On-Time Control
- 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 to 1 MHz
- Adjustable Undervoltage Lockout (UVLO)
- Remote Shutdown
- Thermal Shutdown
- Packages:
- WSON-8
- SO PowerPAD™-8
- Create a Custom Design with WEBENCH Tools
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Description
The LM5017 is a 100-V, 600-mA synchronous step-down regulator with integrated high side and low side MOSFETs. The constant on-time (COT) control scheme employed in the LM5017 requires no loop compensation, provides excellent transient response, and enables very high step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high voltage startup regulator provides bias power for internal operation of the IC and for integrated gate drivers.
A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout (VCC UVLO).
The LM5017 device is available in WSON-8 and HSOP PowerPAD-8 plastic packages.
Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The LM5017 evaluation board provides the design engineer with a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 10V output over an input range of 12.5V to 100V.
Description
An isolated bias supply is implemented in this evaluation board with LM5017 Constant-On-Time regulator. LM5017 regulator integrates both the high and low side power switches essential for creating isolated buck converter.
Features
- Input Range: 20V to 100V
- Primary Output Voltage: 10V
- Secondary (Isolated) Output Voltage: 9.5V
- Maximum Load Current (Primary + Secondary): 300 mA
- Maximum Power Output: 3W
- Nominal Switching Frequency: 750 kHz
- Efficiency (FIN = 48V, IOUT2 = 300 mA): 76 percent
- Board size: 2 inch x 2 inch
Design tools & simulation
Features
- Features isolated topologies like Fly-Buck™, Fly-Buck-Boost, DCM and CCM Flyback
- Capability to design up to 6 isolated outputs
- Recommends ICs for desired application design
- Incorporates loop compensation in designs
- Compares efficiency, external component count and transformer currents for every topology (...)
Reference designs
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| SO PowerPAD (DDA) | 8 | View options |
| WSON (NGU) | 8 | View options |
Ordering & quality
Support & training
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