LM5117QMHX/NOPBQ1 - 65V Sync Buck Controller AEC-Q100 | TI
MPN: LM5117QMHX/NOPBQ1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.58 | $55.80 |
| 100 | $4.8 | $480.00 |
| 500 | $4.15 | $2,075.00 |
| 1,000 | $3.72 | $3,720.00 |
Drop-in alternatives for LM5117QMHX/NOPBQ1 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:
LM5117QPMHX/NOPB
β Drop-Inπ Reference alternative (not in catalog)
LM5117QPMH/NOPB
β Drop-Inπ Reference alternative (not in catalog)
LM5117PMH/NOPB
β Drop-Inβ In Stock
$3.44 / Unit
View Datasheet βLM5117MHX/NOPB
β Drop-Inβ In Stock
$2.2 / Unit
View Datasheet βLM25116QMHX/NOPB
β‘ Same Packageπ Reference alternative (not in catalog)
LM5117QMHX/NOPBQ1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck Controller |
| Input Voltage Range | 5.5 V to 65 V |
| Control Method | Emulated Peak Current Mode |
| Peak Gate Drive Current | 3.3 A |
| Switching Frequency | Up to 750 kHz (free-run or synchronizable) |
| AEC-Q100 Qualification | Grade 1, -40C to +125C ambient |
| Analog Current Monitor | Yes (CM output) |
| Diode Emulation | Optional (light-load efficiency) |
| Dead-Time Control | Adaptive |
| Clock Synchronization | Yes, up to 750 kHz |
| Package | 20-HTSSOP (MH) with exposed pad |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 Qualified |
| Operating Temperature Range | -40C to +125C |
| RoHS Status | Compliant (NOPB - no Pb ball/plating) |
| Output Type | External MOSFET driven (controller) |
LM5117QMHX/NOPBQ1 Pin Configuration
| Pin 1 | SLOPE β Slope compensation setting pin |
| Pin 2 | COMP β Error amplifier output for loop compensation |
| Pin 3 | FB β Feedback voltage input (0.6V reference) |
| Pin 4 | CM β Analog current monitor output |
| Pin 5 | AGND β Analog ground |
| Pin 6 | SS β Soft-start programming pin |
| Pin 7 | RT β Frequency-setting resistor |
| Pin 8 | SYNC β Clock synchronization input/output |
| Pin 9 | HO β High-side gate drive output |
| Pin 10 | HS β High-side source / switch node sense |
| Pin 11 | HB β High-side driver bootstrap supply |
| Pin 12 | LO β Low-side gate drive output |
| Pin 13 | PGND β Power ground |
| Pin 14 | CS β Current sense input |
| Pin 15 | DE β Diode emulation enable |
| Pin 16 | RES β Restart / hiccup control pin |
| Pin 17 | UVLO β UVLO threshold adjustment input |
| Pin 18 | VCC β Internal LDO output / driver supply |
| Pin 19 | VIN β Input supply voltage (5.5V to 65V) |
| Pin 20 | EN β Enable input |
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
LM5117QMHX/NOPBQ1 is suitable for 6 applications: Automotive 48V / 24V Bus Step-Down, Industrial Automation 24V Power Supplies, Telecom Intermediate Bus Conversion, USB-C PD and Adapter Power, ADAS and Infotainment Power, High-Voltage Battery Test and Monitoring Systems.
Automotive 48V / 24V Bus Step-Down
The LM5117QMHX/NOPBQ1 converts 24V or 48V automotive rails (with surge tolerance up to 65V) to 5V or 3.3V system rails. Its emulated peak current-mode control provides inherent line feed-forward, so output regulation stays tight across wide battery-voltage swings, and cycle-by-cycle current limiting protects against shorts. AEC-Q100 Grade 1 qualification (-40C to +125C ambient) is mandatory for under-hood-adjacent ECUs. With 3.3A gate drives driving large external FETs, designs routinely exceed 10A output. Placed as the first stage after reverse-protection and transient clamping, it feeds downstream point-of-load converters with a clean intermediate rail; diode emulation cuts standby drain when the module sleeps.
Recommended
Industrial Automation 24V Power Supplies
Industrial PLC and factory-automation systems universally run 24V rails with wide tolerance; the LM5117QMHX/NOPBQ1 steps these down efficiently with a 65V absolute ceiling covering brownout and transient conditions. Current-mode control simplifies loop compensation, shortening design cycles for multi-output systems, and the analog current monitor (CM pin) feeds a system MCU for predictive maintenance and load telemetry without an extra current-sense amplifier. Free-run operation up to 750 kHz lets designers trade inductor size against efficiency; ~300 kHz is a common industrial choice. Adaptive dead-time and optional diode emulation keep efficiency high across the light-load-to-full-load range typical of I/O modules.
Recommended
Telecom Intermediate Bus Conversion
In -48V telecom power architectures and high-voltage distributed rails, the LM5117QMHX/NOPBQ1 serves as an intermediate-bus converter controller, stepping 48V-class inputs to 12V or 5V intermediate buses with high efficiency. Very small duty-cycle operation - a natural consequence of 65V-to-low-voltage conversion - is well handled by the emulated control ramp, which avoids the subharmonic instability of conventional current mode without heavy slope compensation. External MOSFET selection lets designers scale current from a few amps to tens of amps. Synchronization up to 750 kHz allows multiple converters to be frequency-aligned, simplifying EMI filter design for the system input.
Recommended
USB-C PD and Adapter Power
High-power USB-C PD adapters and chargers with universal AC inputs (rectified to 400V, then down to 20V-class) use a second stage where the LM5117QMHX/NOPBQ1 converts the intermediate 24-48V bus to 5V/9V/15V/20V programmable outputs. Its wide input range covers all PD voltage classes from one design, and cycle-by-cycle current limiting provides the fast overcurrent response PD contracts demand. The analog current monitor supports cable/load diagnostics and PD firmware current reporting. With 3.3A gate drives and adaptive dead-time, 90%+ stage efficiency is achievable at 300-400 kHz, keeping adapter thermal profiles within enclosed-plastic limits.
Recommended
ADAS and Infotainment Power
ADAS camera, radar, and infotainment modules require clean, sequenced low-voltage rails derived from automotive battery power. The LM5117QMHX/NOPBQ1 provides the front-end step-down from battery (with 65V surge headroom for load dump), and its precise current-mode loop delivers low output ripple that simplifies downstream filtering for noise-sensitive image and radar sensor supplies. Grade 1 temperature rating covers cabin-to-engine-bay mounting variety. Soft-start and enable control allow rail sequencing with the system power-management IC, while diode emulation minimizes key-off battery drain - a critical automotive quiescent-budget requirement for always-listening ADAS sensors.
Recommended
High-Voltage Battery Test and Monitoring Systems
Battery formation, test, and BMS auxiliary supplies operate from 48-60V stacks, squarely within the 65V input capability of the LM5117QMHX/NOPBQ1. The analog current monitor output gives a single-pin, amplifier-free measurement of converter current that test equipment MCUs can digitize, reducing BOM cost in multi-channel systems. Robust 3.3A gate drives drive large synchronous FETs for the high circulating currents typical of formation equipment, and cycle-by-cycle limiting safely survives repeated short-circuit events on fixture misconnection. Synchronizable switching up to 750 kHz allows several channels to interleave clocks, spreading EMI across the spectrum.
Recommended
Recommended Products Summary
Engineering reference data for LM5117QMHX/NOPBQ1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5117QPMHX/NOPB | LM5117PMH/NOPB | LM5117MHX/NOPB | LM25116QMHX/NOPB |
|---|---|---|---|---|---|
| Package | HTSSOP-20 (MH) | HTSSOP-20 (PWP, PowerPAD) | HTSSOP-20 (PWP, PowerPAD) | HTSSOP-20 (MH) | HTSSOP-20 (MH) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 5.5 V to 65 V | 5.5 V to 65 V | 5.5 V to 65 V | 5.5 V to 65 V | 5.5 V to 65 V |
| AEC-Q100 Qualification | Yes (Grade 1) | Yes (Grade 1) | No | No | Yes (Grade 1) |
| Peak Gate Drive | 3.3 A | 3.3 A | 3.3 A | 3.3 A | [DATA_NEEDED] |
| Max Switching Frequency | 750 kHz | 750 kHz | 750 kHz | 750 kHz | [DATA_NEEDED] |
| Analog Current Monitor | Yes (CM pin) | Yes (CM pin) | Yes (CM pin) | Yes (CM pin) | No |
| Control Topology | Emulated peak current mode | Emulated peak current mode | Emulated peak current mode | Emulated peak current mode | [DATA_NEEDED] |
| Relative Price (1k, as of 2026-08-29) | Baseline (Q1 premium) | Comparable | Lower (commercial grade) | Lower (commercial grade) | [DATA_NEEDED] |
Key Differentiators
- Automotive AEC-Q100 Grade 1 qualification (vs LM5117MHX/NOPB)
- Integrated analog current monitor (CM pin) (vs LM25116QMHX/NOPB)
- 65V input with emulated current-mode control (vs Generic 60V controllers)
Design Notes
Route the CS current-sense pair as a Kelvin connection directly across the current-sense element; the emulated current-mode loop accuracy and the CM analog current monitor output both depend on clean sense signals. Keep HO/HB and LO gate-drive loops under 1 cm with the driver return (PGND/HS) adjacent. Place VIN and VCC decoupling (0.1uF + 4.7uF) within 3 mm of their pins. Reference TI datasheet layout section and LM5117 EVM user guide for the recommended 4-layer stackup.
At 48V input converting to 5V, duty cycle is very small (~10%); the LM5117's emulated ramp is designed for this, but verify the minimum on-time at 750 kHz operation - if constrained, reduce frequency to 200-400 kHz. Size the bootstrap capacitor (0.1uF + diode) for the chosen FET gate charge, and confirm VCC LDO thermal margin when driving large MOSFETs at high frequency.
Do not exceed 65V on VIN - automotive load dump requires external TVS clamping upstream. The UVLO pin divider must be set so the part does not chatter during cranking transients. When using diode emulation (DE pin), be aware that synchronous rectification is disabled at light load, changing light-load output ripple behavior; validate both DE modes in your load profile before freezing the design.
Compliance Information
NOPB suffix denotes No Pb (lead-free). AEC-Q100 Grade 1 qualification confirmed by TI LM5117-Q1 product page. REACH/halogen status not stated in provided data.
