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LM5117PMHX/NOPB
Texas Instruments
IC REG CTRLR BUCK 20TSSOP
20395 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 20-HTSSOP
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Minimum 1
Minimum 1
5.0 / 5.0
- (112 Ratings)
LM5117PMHX/NOPB
Product Overview
1339470
DiGi Electronics Part Number
LM5117PMHX/NOPB-DGManufacturer
Texas Instruments
LM5117PMHX/NOPB
Description
IC REG CTRLR BUCK 20TSSOPInventory
20395 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 20-HTSSOP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM5117PMHX/NOPB Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Output Type
Transistor Driver
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
5.5V ~ 65V
Frequency - Switching
200kHz, 480kHz
Duty Cycle (Max)
-
Synchronous Rectifier
Yes
Clock Sync
No
Serial Interfaces
-
Control Features
Frequency Control, Ramp, Soft Start
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
20-PowerTSSOP (0.173", 4.40mm Width)
Supplier Device Package
20-HTSSOP
Base Product Number
LM5117
Datasheet & Documents
Manufacturer Product Page
LM5117PMHX/NOPB Specifications
HTML Datasheet
LM5117PMHX/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-41310-6
LM5117PMHX/NOPB-DG
296-41310-1
296-41310-2
Standard Package
2,500
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
商品到貨速度令人滿意，包裝做得非常扎實，讓我很放心購買。
de desembre 02, 2025
The professional packaging process ensures the products are delivered in pristine condition.
de desembre 02, 2025
Quick response times and speedy delivery make my experience outstanding.
de desembre 02, 2025
The company's commitment to quality assurance truly enhances customer trust.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LM5117PMHX/NOPB in a high-input-voltage industrial power supply, and how can they be mitigated?
When designing in the LM5117PMHX/NOPB for high-input-voltage applications (up to 65V), key risks include overvoltage transients on the VIN pin and improper gate drive strength for external MOSFETs. Since the LM5117PMHX/NOPB uses a bootstrap-based high-side driver, ensure the bootstrap capacitor is adequately rated for ripple current and placed close to the device to avoid turn-on delays. Use a transient voltage suppression (TVS) diode on the input rail to protect against load dump or line surges. Additionally, verify that the external high-side MOSFET's gate charge and threshold voltage are compatible with the LM5117PMHX/NOPB's 5.5V gate drive to prevent shoot-through and ensure reliable switching at 480kHz.
Can the LM5117PMHX/NOPB replace the LM5116 or RT7287APGQ in an existing buck converter design, and what board-level changes are required?
The LM5117PMHX/NOPB can replace the LM5116 in many step-down designs due to similar pinouts and functionality, but key differences exist. Unlike the LM5116, the LM5117PMHX/NOPB includes adjustable current-mode slope compensation, offering better stability under low-duty-cycle conditions. However, replacing an RT7287APGQQ requires evaluating operating frequency compatibility—one external resistor sets frequency for the LM5117PMHX/NOPB, while the Richtek part uses a different timing scheme. Board changes may include modifying the RT resistor, adjusting the soft-start capacitor value, and verifying feedback loop compensation due to differences in error amplifier characteristics. Always simulate loop response when swapping controllers like LM5117PMHX/NOPB for RT7287APGQ.
How does the LM5117PMHX/NOPB perform in high-temperature environments, and what PCB layout practices improve thermal reliability?
The LM5117PMHX/NOPB supports junction temperatures up to 125°C, making it suitable for harsh industrial environments, but thermal performance relies heavily on PCB design. The 20-HTSSOP package has an exposed thermal pad; to ensure effective heat dissipation, use a multi-layer PCB with a solid thermal via array under the pad connected to a ground plane. Avoid placing thermal vias near signal traces to prevent solder wicking. Keep switching nodes small to minimize EMI-induced heating and reduce copper pour asymmetry. Thermal resistance (θJA) can be reduced from ~45°C/W to under 30°C/W with proper layout, preventing premature thermal shutdown during continuous high-load operation.
What are the consequences of syncing the LM5117PMHX/NOPB with an external clock despite its 'No' clock sync specification, and are there safe workarounds?
The LM5117PMHX/NOPB lacks an internal sync circuit, so attempting to force synchronization via external injection into the RT pin or oscillator node can cause erratic switching, frequency drifting, or jitter, leading to unstable output or EMI failures. Instead of syncing directly, use the LM5117PMHX/NOPB in standalone mode with its factory-set frequency and isolate it from other switching supplies using input filtering. If system-wide sync is mandatory, consider pairing it with a synced controller (e.g., LM5143A) on the same board and stagger layouts to minimize coupling. Alternatively, select the LM5117E variant if available, which supports synchronization, or redesign with a pin-compatible synced controller like the TPS513630RHHR.
What are common pitfalls when setting the soft-start time on the LM5117PMHX/NOPB, and how does it affect inrush current in motor drive applications?
A poorly set soft-start time on the LM5117PMHX/NOPB can lead to inrush current surges, especially in motor drive or capacitive-loaded systems, risking MOSFET overstress or input rail collapse. The soft-start capacitor value directly controls ramp-up time—too small and inductors/motor windings see excessive di/dt; too large and startup becomes overly slow, triggering upstream fault protection. For motor drives, calculate soft-start duration to limit input surge below 120% of rated current. Use ceramic output capacitors with low ESL to reduce peaking during startup. Also, ensure the feedback loop has sufficient phase margin during soft-start by simulating startup transients in tools like TINA-TI, especially when driving dynamic loads with the LM5117PMHX/NOPB.
Quality Assurance (QC)
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LM5117PMHX/NOPB CAD Models
Texas Instruments LM5117PMHX/NOPB PCB symbols & footprints
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