LM5117PMH/NOPB - 5.5-65V Sync Buck Controller | Texas Instruments
MPN: LM5117PMH/NOPB β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
Drop-in alternatives for LM5117PMH/NOPB β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LM5117MHX/NOPB
β Drop-Inβ In Stock
$2.2 / Unit
View Datasheet βLM5117PMHE/NOPB
β Drop-Inπ Reference alternative (not in catalog)
LM5117QMH/NOPB
β Drop-Inπ Reference alternative (not in catalog)
LM5117QMHX/NOPB
β Drop-Inπ Reference alternative (not in catalog)
LT3845EFE#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3891EFE#PBF
β Drop-Inπ Reference alternative (not in catalog)
LM5117PMH/NOPB Maximum Ratings & Electrical Characteristics
| Function | Step-Down (Buck) Controller |
| Output Type | Single |
| Input Voltage Range | 5.5 V to 65 V |
| Output Voltage Range | 1.5 V to 80 V (adjustable) |
| Maximum Duty Cycle | 95% |
| Switching Frequency | 50 kHz to 530 kHz (programmable) |
| Control Method | Current Mode (emulated ramp) |
| Number of Outputs | 1 |
| Package / Case | 20-HTSSOP (PWP) 4.40mm width, exposed pad |
| Operating Temperature Range | -40Β°C to +125Β°C |
| Supply Voltage (VCC) | 5.5 V to 14 V |
| Reference Voltage | 1.5 V Β±1.5% |
| Analog Current Monitor | Yes |
| Enable Pin | Yes |
| RoHS Status | Compliant |
LM5117PMH/NOPB Pin Configuration
| Pin 1 | VCC β Supply voltage for the controller, 5.5V to 14V |
| Pin 2 | VIN β Input voltage sense, connects to the input supply |
| Pin 3 | HO β High-side gate driver output |
| Pin 4 | SW β Switch node, connects to the high-side MOSFET source and low-side MOSFET drain |
| Pin 5 | LO β Low-side gate driver output |
| Pin 6 | PGND β Power ground for the gate drivers |
| Pin 7 | CS β Current sense input, connects to the current sense resistor |
| Pin 8 | COMP β Error amplifier output for loop compensation |
| Pin 9 | FB β Feedback input, connects to the output voltage divider |
| Pin 10 | SS β Soft-start programming pin |
| Pin 11 | RT β Switching frequency programming pin |
| Pin 12 | EN β Enable pin, active high |
| Pin 13 | AGND β Analog ground |
| Pin 14 | CM β Analog current monitor output |
| Pin 15 | VREF β 1.5V reference output |
| Pin 16 | NC β No connect |
| Pin 17 | NC β No connect |
| Pin 18 | NC β No connect |
| Pin 19 | NC β No connect |
| Pin 20 | NC β No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LM5117PMH/NOPB is suitable for 6 applications: Industrial Power Supplies, Automotive Infotainment and Body Electronics, Telecom and Networking Equipment, High-Voltage Battery-Powered Systems, Server and Datacenter Power, Reference Design PMP20808.
Industrial Power Supplies
The LM5117PMH/NOPB is ideal for industrial power supplies requiring a wide input voltage range (5.5V to 65V) and high efficiency. Its current-mode control provides excellent line and load transient response, making it suitable for factory automation, test equipment, and process control systems. The analog current monitor enables precise current sensing for system monitoring and protection, ensuring reliable operation in harsh industrial environments.
Recommended
Automotive Infotainment and Body Electronics
With a wide input range of 5.5V to 65V and an operating temperature range of -40Β°C to +125Β°C, the LM5117PMH/NOPB is well-suited for automotive infotainment systems, body control modules, and lighting. It can handle load-dump transients and cold-crank conditions, ensuring stable power delivery. The programmable switching frequency allows optimization for EMI and efficiency, critical for automotive EMC compliance.
Recommended
Telecom and Networking Equipment
The LM5117PMH/NOPB is used in telecom and networking equipment where input voltages range from 12V to 48V. Its high efficiency and current-mode control reduce power loss and improve thermal management in dense PCB layouts. The analog current monitor allows for accurate current sharing in parallel power modules, enhancing system reliability. The device's wide input range accommodates battery backup systems and voltage fluctuations.
Recommended
High-Voltage Battery-Powered Systems
For battery-powered systems with high voltage stacks, such as electric vehicles and energy storage, the LM5117PMH/NOPB provides efficient step-down conversion from 48V or higher. Its wide input range and programmable frequency allow designers to optimize for efficiency and component size. The device's robust protection features, including cycle-by-cycle current limiting and thermal shutdown, ensure safe operation under fault conditions.
Recommended
Server and Datacenter Power
In server and datacenter power supplies, the LM5117PMH/NOPB is used for intermediate bus conversion from 48V to 12V or lower. Its high efficiency reduces cooling requirements and operating costs. The current-mode control provides fast transient response to dynamic loads, ensuring stable output voltage. The analog current monitor enables precise power monitoring for energy management systems.
Recommended
Reference Design PMP20808
The LM5117PMH/NOPB is used in TI's PMP20808 reference design, which converts 36V-40V input to 25V output at 18A continuous current. This design demonstrates the controller's capability in high-power, high-voltage step-down applications. The reference design provides a tested layout and BOM, reducing development time for engineers. The LM5117's analog current monitor is used for output current sensing and protection.
Recommended
Recommended Products Summary
Engineering reference data for LM5117PMH/NOPB β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5117MHX/NOPB | LM5117PMHE/NOPB | LM5117QMH/NOPB | LT3845EFE#PBF | LTC3891EFE#PBF |
|---|---|---|---|---|---|---|
| Package | 20-HTSSOP (PWP) | 20-HTSSOP (PWP) | 20-HTSSOP (PWP) | 20-HTSSOP (PWP) | 20-TSSOP (EP) | 20-TSSOP (EP) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Input Voltage Range | 5.5V to 65V | 5.5V to 65V | 5.5V to 65V | 5.5V to 65V | 4V to 60V | 4.5V to 60V |
| Switching Frequency | 50kHz to 530kHz | 50kHz to 530kHz | 50kHz to 530kHz | 50kHz to 530kHz | 100kHz to 500kHz | 50kHz to 900kHz |
| Control Method | Current Mode | Current Mode | Current Mode | Current Mode | Current Mode | Current Mode |
| Analog Current Monitor | Yes | Yes | Yes | Yes | No | No |
| Automotive Grade | No | No | No | Yes (AEC-Q100) | No | No |
| Price (1pc) | $3.42 | $3.42 | $3.50 | $4.20 | $5.10 | $4.80 |
Key Differentiators
- Wide input voltage range up to 65V (vs LT3845EFE#PBF)
- Analog current monitor output (vs LTC3891EFE#PBF)
- Automotive grade variants available (vs LM5117MHX/NOPB)
Design Notes
For optimal performance, place the LM5117PMH/NOPB close to the power stage MOSFETs and keep the gate drive traces short and wide to minimize inductance. The bootstrap capacitor for the high-side driver should be placed as close as possible to the BOOT and SW pins. Use a solid ground plane for PGND and AGND, and connect them at a single point near the IC to avoid noise coupling.
The HTSSOP-20 package has an exposed pad that must be soldered to a copper area on the PCB for effective heat dissipation. The thermal resistance (theta_JA) is approximately 40Β°C/W with proper PCB layout. For high-power applications, ensure adequate copper area and consider adding thermal vias to the ground plane. Monitor the junction temperature to stay within the -40Β°C to +125Β°C operating range.
A common mistake is incorrect current sensing. The CS pin must be connected to the current sense resistor in the source of the low-side MOSFET. Use a Kelvin connection to avoid parasitic resistance errors. Also, ensure the VCC supply is properly decoupled with a 0.1uF ceramic capacitor close to the VCC pin. The RT pin resistor sets the switching frequency; verify it is within the recommended range to avoid instability.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified; use LM5117QMH/NOPB for automotive.
