Overview
The LM5117PMHX/NOPB, produced by Texas Instruments, is a high-voltage synchronous buck controller designed to operate over a wide input voltage range from 5.5 V to 65 V. This controller integrates high-side and low-side NMOS drivers and employs peak current mode control with an emulated current ramp, which reduces noise sensitivity and allows reliable operation in high input voltage applications. The device features a programmable switching frequency up to 750 kHz, adaptive dead-time output driver control, and various protection mechanisms including cycle-by-cycle and hiccup mode current limiting, thermal shutdown, and remote shutdown capability.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VIN to AGND | -0.3 | 75 | V | |
| Switching Frequency | 50 kHz | 750 kHz | ||
| Peak HO Source Current | 2.2 A | |||
| Peak HO Sink Current | 3.3 A | |||
| Thermal Shutdown Temperature | 165 °C | |||
| Output Voltage Range | 0.8 V | |||
| Package Type | HTSSOP-20, WQFN-24 |
Key Features
- Wide operating range from 5.5 V to 65 V
- Robust 3.3-A peak gate drives
- Adaptive dead-time output driver control
- Free-run or synchronizable clock up to 750 kHz
- Optional diode emulation mode for discontinuous mode operation
- Programmable output from 0.8 V with precision 1.5% voltage reference
- Analog current monitor and programmable current limit
- Hiccup mode overcurrent protection and thermal shutdown
- Programmable soft-start and tracking
- Programmable line undervoltage lockout and switchover to external bias supply
Applications
- Automotive Infotainment
- Industrial DC-DC Motor Drivers
- Automotive USB Power
- Telecom Server
Q & A
- What is the input voltage range of the LM5117? The LM5117 operates over an input voltage range from 5.5 V to 65 V.
- What is the maximum switching frequency of the LM5117? The maximum switching frequency is up to 750 kHz.
- What protection mechanisms does the LM5117 include? The LM5117 includes cycle-by-cycle and hiccup mode current limiting, thermal shutdown, and remote shutdown capability.
- Can the LM5117 operate in diode emulation mode? Yes, the LM5117 can operate in diode emulation mode for discontinuous mode operation.
- What is the precision of the voltage reference in the LM5117? The voltage reference has a precision of 1.5%.
- Does the LM5117 support external bias supply? Yes, the LM5117 supports switchover to an external bias supply.
- What are the typical applications of the LM5117? Typical applications include automotive infotainment, industrial DC-DC motor drivers, automotive USB power, and telecom servers.
- What are the package options for the LM5117? The LM5117 is available in HTSSOP-20 and WQFN-24 packages.
- How does the soft-start feature work in the LM5117? The soft-start feature allows the regulator to gradually reach the steady state operating point by using an internal 10-µA current source to charge an external soft-start capacitor.
- Does the LM5117 provide any current monitoring features? Yes, the LM5117 includes an analog current monitor that provides averaged output current information.
