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LM5118Q1MHX/NOPB
Texas Instruments
IC REG CTRLR BCK/BCK-BST 20TSSOP
27894 Pcs New Original In Stock
Buck, Buck-Boost Regulator Positive Output Step-Down, Step-Up/Step-Down DC-DC Controller IC 20-HTSSOP
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5.0 / 5.0
- (251 Ratings)
LM5118Q1MHX/NOPB
Product Overview
1332187
DiGi Electronics Part Number
LM5118Q1MHX/NOPB-DGManufacturer
Texas Instruments
LM5118Q1MHX/NOPB
Description
IC REG CTRLR BCK/BCK-BST 20TSSOPInventory
27894 Pcs New Original In Stock
Buck, Buck-Boost Regulator Positive Output Step-Down, Step-Up/Step-Down DC-DC Controller IC 20-HTSSOP
Quantity
Minimum 1
Minimum 1
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LM5118Q1MHX/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, Step-Up/Step-Down
Output Configuration
Positive
Topology
Buck, Buck-Boost
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
3V ~ 75V
Frequency - Switching
200kHz, 515kHz
Duty Cycle (Max)
80%
Synchronous Rectifier
No
Clock Sync
Yes
Serial Interfaces
-
Control Features
Enable, Frequency Control, Ramp, Soft Start
Operating Temperature
-40°C ~ 125°C (TJ)
Grade
Automotive
Qualification
AEC-Q100
Mounting Type
Surface Mount
Package / Case
20-PowerTSSOP (0.173", 4.40mm Width)
Supplier Device Package
20-HTSSOP
Base Product Number
LM5118
Datasheet & Documents
Manufacturer Product Page
LM5118Q1MHX/NOPB Specifications
HTML Datasheet
LM5118Q1MHX/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
LM5118Q1MHX-DG
LM5118Q1MHX/NOPB-DG
296-43600-6
LM5118Q1MHX
296-43600-1
296-43600-2
-296-43600-1
-296-43600-1-DG
Standard Package
2,500
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
他們的售後服務讓我感到非常貼心，價格也非常合理，是我非常信賴的品牌之一。
de desembre 02, 2025
Leur système d’emballage garantit que les produits arrivent intacts, même pour les envois longue distance.
de desembre 02, 2025
Ich schätze die transparente Kommunikation und die zuverlässige Verpackung bei DiGi Electronics sehr.
de desembre 02, 2025
I highly recommend DiGi Electronics for their dependable after-sales service and shipping stability.
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Frequently Asked Questions (FAQ)
Can the LM5118Q1MHX/NOPB be used to replace an LM25118 in a 48V automotive power system, and what design changes are needed to ensure reliable operation?
Yes, the LM5118Q1MHX/NOPB can replace the LM25118 in a 48V automotive application, but key design adjustments are required. While both are buck-boost controllers, the LM5118Q1MHX/NOPB is AEC-Q100 qualified and rated for -40°C to 125°C junction temperature, making it better suited for harsh automotive environments. However, the LM5118Q1MHX/NOPB has a higher minimum Vcc of 3V (vs. 2.95V on LM25118), so ensure your startup circuit maintains sufficient bias voltage during cold-crank conditions. Additionally, the LM5118Q1MHX/NOPB supports frequency synchronization and programmable soft-start—leverage these to avoid beat frequencies with other systems and reduce inrush stress. Always revalidate gate drive timing and compensation networks due to differences in internal ramp and error amplifier characteristics.
What are the risks of using the LM5118Q1MHX/NOPB in a high-vibration automotive environment without additional PCB layout precautions?
The LM5118Q1MHX/NOPB is AEC-Q100 qualified, but mechanical reliability depends heavily on PCB layout and assembly. In high-vibration scenarios—common in engine compartments or heavy-duty vehicles—poor solder joints or long high-current loops can lead to intermittent failures or increased EMI. To mitigate risk, use a solid ground plane, minimize loop areas in the power stage (especially between input caps, MOSFETs, and inductor), and secure the 20-HTSSOP package with adequate solder fillets. Avoid placing the IC near board edges or unsupported spans. Also, consider conformal coating to prevent microcracking from thermal cycling, which can be exacerbated by vibration. Without these measures, long-term field reliability may degrade despite the part’s automotive grade.
How does the LM5118Q1MHX/NOPB compare to the LT8705 when designing a wide-input-range (9V to 60V) buck-boost converter for electric vehicle auxiliary systems?
The LM5118Q1MHX/NOPB and LT8705 both support buck-boost operation, but they serve different design priorities. The LM5118Q1MHX/NOPB is a controller (requiring external MOSFETs), offering flexibility in power stage design and lower BOM cost for high-current applications (>20A), while the LT8705 is a fully integrated regulator with built-in FETs, simplifying layout but limiting peak current (~8A). For EV auxiliary systems needing robust thermal performance and scalability, the LM5118Q1MHX/NOPB is preferable—especially since it supports frequency sync to avoid interference with sensitive analog circuits. However, the LT8705 includes features like input/output current limiting and bidirectional operation, which the LM5118Q1MHX/NOPB lacks. Choose the LM5118Q1MHX/NOPB when cost, power scalability, and automotive qualification outweigh integration benefits.
Is it safe to operate the LM5118Q1MHX/NOPB at its maximum duty cycle (80%) continuously in a 12V-to-24V buck-boost application under high ambient temperatures?
Operating the LM5118Q1MHX/NOPB near its 80% max duty cycle continuously in high ambient temperatures (e.g., >85°C) increases risk of thermal runaway and reduced lifetime, even though the junction rating goes up to 125°C. At high duty cycles, the high-side MOSFET conducts longer, increasing conduction losses and stress on the controller’s gate drivers. In a 12V-to-24V boost-dominated mode, ensure adequate heatsinking for both the IC and external FETs, and derate switching frequency if necessary to reduce switching losses. Monitor Vcc stability, as dropout conditions near max duty can cause UVLO resets. TI recommends keeping average junction temperature below 110°C for long-term reliability—use thermal vias under the HTSSOP pad and validate with infrared imaging under worst-case load and temperature.
Can the LM5118Q1MHX/NOPB be synchronized to an external clock in a multi-rail automotive power system to reduce EMI interference with ADAS sensors?
Yes, the LM5118Q1MHX/NOPB supports clock synchronization via its SYNC pin, which is critical in multi-rail automotive systems where EMI can disrupt ADAS sensors like radar or cameras. By synchronizing the LM5118Q1MHX/NOPB to a master clock (e.g., 400kHz), you eliminate beat frequencies and concentrate emissions at predictable harmonics, simplifying EMI filtering and CISPR 25 compliance. Ensure the external clock amplitude meets the 1.2V minimum threshold and has sharp edges to avoid false triggering. Avoid synchronizing multiple controllers with slightly different free-running frequencies, as this can cause subharmonic instability. Use a low-jitter clock source and route the SYNC signal away from high di/dt nodes to prevent coupling noise back into the control loop.
Quality Assurance (QC)
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LM5118Q1MHX/NOPB CAD Models
Texas Instruments LM5118Q1MHX/NOPB PCB symbols & footprints
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