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LM5117QPSQ/NOPB
Texas Instruments
IC REG CTRLR BUCK 24WQFN
34964 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 24-WQFN (4x4)
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5.0 / 5.0
- (391 Ratings)
LM5117QPSQ/NOPB
Product Overview
1365762
DiGi Electronics Part Number
LM5117QPSQ/NOPB-DGManufacturer
Texas Instruments
LM5117QPSQ/NOPB
Description
IC REG CTRLR BUCK 24WQFNInventory
34964 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 24-WQFN (4x4)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM5117QPSQ/NOPB Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
-
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)
Grade
Automotive
Qualification
AEC-Q100
Mounting Type
Surface Mount
Package / Case
24-WFQFN Exposed Pad
Supplier Device Package
24-WQFN (4x4)
Base Product Number
LM5117
Datasheet & Documents
Manufacturer Product Page
LM5117QPSQ/NOPB Specifications
HTML Datasheet
LM5117QPSQ/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-51313-6
TEXTISLM5117QPSQ/NOPB
296-51313-2
LM5117QPSQ/NOPB-DG
296-51313-1
2156-LM5117QPSQ/NOPB
Standard Package
1,000
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
상담과 포장 모두 기대 이상이었어요. 매우 만족합니다.
de desembre 02, 2025
이용하는 내내 편안했고, 고객 서비스가 너무 좋아서 추천하고 싶어요.
de desembre 02, 2025
Shipping reliability from DiGi Electronics helps me manage my inventory efficiently.
de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LM5117QPSQ/NOPB in a high-temperature automotive environment, and how can thermal performance be optimized on a 4-layer PCB?
When designing in the LM5117QPSQ/NOPB for automotive applications, the primary risk lies in maintaining junction temperature below 125°C under continuous load, especially given its 5.5V to 65V input range and synchronous buck topology. Since the device uses a 24-WQFN (4x4) package with an exposed pad, insufficient PCB thermal vias or poor copper layout can lead to thermal runaway. To mitigate this, use at least 4–6 thermal vias under the exposed pad connected to a solid ground plane, increase copper area for VIN, SW, and PGND connections, and consider a 4-layer stack-up with internal planes dedicated to heat dissipation. Avoid routing sensitive small-signal traces (e.g., feedback or soft-start) near high dV/dt SW nodes to prevent noise coupling, which is critical in noisy vehicle electrical environments.
How does the LM5117QPSQ/NOPB compare to the LM5116 or LT3762 when replacing legacy controllers in industrial step-down designs with input voltages above 50V?
The LM5117QPSQ/NOPB offers a better balance of simplicity and robustness for 50V+ industrial designs compared to the LM5116 and LT3762. Unlike the LM5116, which has a lower max input voltage (100V but often derated), the LM5117QPSQ/NOPB’s 65V max is conservatively specified with integrated bias regulation, reducing external component count. Compared to the LT3762, which supports higher currents and spread-spectrum, the LM5117QPSQ/NOPB lacks clock synchronization but provides superior EMI performance due to controlled gate drive ramping and lower quiescent current. For designs prioritizing cost, AEC-Q100 Grade 1 qualification, and thermal stability over sync capability, the LM5117QPSQ/NOPB is a safer drop-in for mid-power (up to 15A) replacements where external MOSFET selection can scale performance without changing controller.
Can the LM5117QPSQ/NOPB reliably drive both high-side and low-side MOSFETs in a synchronous buck configuration, and what gate driver strength should be expected in fast-switching applications?
Yes, the LM5117QPSQ/NOPB is designed specifically to drive external high-side and low-side N-channel MOSFETs in a synchronous buck topology, with integrated 1.2A peak source and 1.5A peak sink gate drivers. In fast-switching applications at 480kHz, ensure low gate loop inductance by minimizing trace length between the LM5117QPSQ/NOPB’s HO/LO pins and MOSFET gates. Use 0-ohm resistors or ferrite beads near gate drivers only if ringing is observed. For high VIN applications (e.g., 60V), select MOSFETs with low Q_g (<30nC) to avoid shoot-through due to propagation delays. Poor gate drive strength matching between FETs can cause overheating—verify timing margins using an oscilloscope on ISNS and SW signals during prototyping.
What are the implications of the lack of clock synchronization in the LM5117QPSQ/NOPB when integrating into multi-rail power systems with noise-sensitive analog loads?
The absence of clock synchronization in the LM5117QPSQ/NOPB means the switching frequency (selectable 200kHz or 480kHz via resistor) floats independently, which can cause beat frequencies when multiple converters operate in close proximity. In multi-rail systems feeding noise-sensitive analog loads (e.g., ADC references or sensor interfaces), this increases the risk of interference at sum-and-difference frequencies. To mitigate, physically separate the LM5117QPSQ/NOPB-based stage from sensitive circuits, use differential filtering (LC + common-mode choke) on output rails, and stagger switching frequencies across other regulators (e.g., 300kHz for another rail). Alternatively, consider the LM5117QPSQE/NOPB if phase spread or sync is later required, though routing complexity increases.
What are the reliability concerns when using the LM5117QPSQ/NOPB in stop-start automotive systems, and how should soft-start and UVLO be configured for repeat power cycling?
In stop-start automotive systems, the LM5117QPSQ/NOPB faces repeated inrush and brown-out events, increasing stress on external components. To enhance reliability, properly configure the soft-start pin with a 10nF–22nF capacitor to limit inrush current during each restart, preventing output voltage overshoot and MOSFET thermal cycling. Set the undervoltage lockout (UVLO) via the resistor divider on VIN to 7V turn-on and 6V hysteresis to avoid erratic operation during cranking dips. Additionally, ensure the bootstrap capacitor (0.1μF ceramic, X7R) is placed close to the HO and ISNS pins and rated for 25V to maintain high-side drive integrity over 100,000+ cycles. The AEC-Q100 qualification of the LM5117QPSQ/NOPB supports this durability, but lifetime depends heavily on external component derating.
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LM5117QPSQ/NOPB CAD Models
Texas Instruments LM5117QPSQ/NOPB PCB symbols & footprints
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