Overview
The LM5161PWPT is a high-performance, 100-V, 1-A synchronous step-down converter manufactured by Texas Instruments. This device is designed to operate over a wide input voltage range of 4.5-V to 100-V and is particularly suited for applications requiring efficient step-down regulation from higher input voltages. The LM5161 features integrated high-side and low-side MOSFETs, eliminating the need for an external Schottky diode. It employs a constant-ON-time control scheme that requires no external loop compensation, ensuring fast transient response and high step-down ratios. The device is available in a 14-pin HTSSOP package with an exposed pad, enhancing thermal performance.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN to AGND) | -0.3 | 100 | V | |
| Maximum Load Current | 1 | A | ||
| Operating Temperature Range | -40 | 125 | °C | |
| Maximum Junction Temperature | 150 | °C | ||
| Switching Frequency | Up to 1 MHz | |||
| Feedback Voltage Reference | 1.975 | 2 | 2.015 | V |
| Thermal Shutdown Threshold | 175 | °C | ||
| Package Type | HTSSOP (14 pins) |
Key Features
- Wide 4.5-V to 100-V Input Voltage Range
- Integrated High-Side and Low-Side Switches
- No Schottky Diode Required
- Constant ON-Time Control with No External Loop Compensation
- Fast Transient Response
- Selectable DCM Buck Operation at Light Load
- CCM Option Supports Multi-Output Fly-Buck™
- No External Ripple Circuit Needed (at FPWM = 0)
- Nearly Constant Switching Frequency
- Frequency Adjustable Up to 1 MHz
- Programmable Soft-Start Time
- Prebias Start-Up
- Peak Current Limiting Protection
- Adjustable Input UVLO and Hysteresis
- ±1% Feedback Voltage Reference
- Thermal Shutdown Protection
Applications
- Industrial Programmable Logic Controller
- IGBT Gate Drive Bias Supply
- Telecom DC-DC Primary and Secondary Side Bias
- E-Meter Power Line Communication
- Low-Power (<12W), Isolated DC-DC (Fly-Buck)
Q & A
- What is the input voltage range of the LM5161PWPT?
The input voltage range is 4.5-V to 100-V.
- What is the maximum load current of the LM5161PWPT?
The maximum load current is 1 A.
- What type of control scheme does the LM5161PWPT use?
The LM5161PWPT uses a constant-ON-time control scheme.
- Does the LM5161PWPT require external loop compensation?
No, it does not require external loop compensation.
- What are the operating temperature ranges for the LM5161PWPT?
The operating temperature range is -40°C to 125°C.
- What is the thermal shutdown threshold of the LM5161PWPT?
The thermal shutdown threshold is 175°C.
- Can the LM5161PWPT operate in both CCM and DCM modes?
- What is the feedback voltage reference accuracy of the LM5161PWPT?
The feedback voltage reference accuracy is ±1%.
- Does the LM5161PWPT support multi-output Fly-Buck applications?
- Is the switching frequency of the LM5161PWPT adjustable?
