Counterfeit and defect prevention
Visual and packaging inspection
Electrical performance verification
Service Email:
[email protected]
>
LM5146QRGYTQ1
Texas Instruments
IC REG BUCK ADJ 3.5A 20VQFN
2468 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 20-VQFN (4.5x3.5)
Request Quote
(Ships tomorrow)
*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (475 Ratings)
LM5146QRGYTQ1
Product Overview
1331824
DiGi Electronics Part Number
LM5146QRGYTQ1-DGManufacturer
Texas Instruments
LM5146QRGYTQ1
Description
IC REG BUCK ADJ 3.5A 20VQFNInventory
2468 Pcs New Original In Stock
Buck Regulator Positive Output Step-Down DC-DC Controller IC 20-VQFN (4.5x3.5)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
How to Order
Shipping & Delivery
Quality Assurance
365 - Day Quality Guarantee - Every part fully backed.
90 - Day Refund or Exchange - Defective parts? No hassle.
Limited Stock, Order Now - Get reliable parts without worry.
Global Shipping & Secure Packaging
Worldwide Delivery in 3-5 Business Days
100% ESD Anti-Static Packaging
Real-Time Tracking for Every Order
Secure & Flexible Payment
Credit Card, VISA, MasterCard, PayPal, Western Union, Telegraphic Transfer(T/T) and more
All payments encrypted for security
LM5146QRGYTQ1 Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Output Type
Adjustable
Function
Step-Down
Output Configuration
Positive
Topology
Buck
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
5.5V ~ 100V
Frequency - Switching
100kHz ~ 1MHz
Duty Cycle (Max)
99%
Synchronous Rectifier
Yes
Clock Sync
Yes
Serial Interfaces
-
Control Features
Enable, Frequency Control, Power Good, Soft Start
Operating Temperature
-40°C ~ 125°C (TA)
Grade
Automotive
Qualification
AEC-Q100
Mounting Type
Surface Mount, Wettable Flank
Package / Case
20-VFQFN Exposed Pad
Supplier Device Package
20-VQFN (4.5x3.5)
Base Product Number
LM5146
Datasheet & Documents
Manufacturer Product Page
LM5146QRGYTQ1 Specifications
HTML Datasheet
LM5146QRGYTQ1-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-53380-1
2156-LM5146QRGYTQ1
296-53380-2
296-53380-6
Standard Package
250
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
Their packaging quality is consistent, and their prices help me save significantly.
de desembre 02, 2025
Fast shipping that exceeded my expectations, with safety in packaging.
de desembre 02, 2025
DiGi Electronics has a proven track record of delivering dependable products that perform under demanding conditions.
de desembre 02, 2025
Their clear pricing structure makes shopping straightforward and risk-free.
Publish Evalution
Evalution Message
Please enter your review message.
Please post honest comments and do not post ilegal comments.
Frequently Asked Questions (FAQ)
When replacing an LM76003 in a 24 V truck application, what hidden thermal issue could make LM5146QRGYTQ1 a risky choice at 3.3 V/3 A even though both are 100-V buck controllers?
LM5146QRGYTQ1 is a controller, not a monolithic switcher: the 3.5 A rating refers to external MOSFET current, not package dissipation. At 24 V→3.3 V the external high-side FET will see ≈1.4 W switching loss with typical 10 nC gate charge and 400 kHz. Use dual square 5 mm×6 mm FETs with θJA <40 °C/W and add a 4 cm² copper pour on the top layer, or the FET junction will exceed 125 °C under automotive hood limits. A drop-in module such as LM76003 integrates the FETs and spreads heat internally; going controller-style moves the thermal bottleneck to your layout—assume 30 % more area and vias under the FETs when you swap to LM5146QRGYTQ1.
I’m synchronising LM5146QRGYTQ1 to the 2 MHz FSW of an ADP5070 in the same 12 V rail; what unexpected beat-tone could appear and how do I guarantee <1 mV residual ripple?
LM5146QRGYTQ1 sync pin accepts 100 kHz–1 MHz only; 2 MHz is outside spec. Divide the ADP5070 clock by two (flip-flop or LMK1C1102) to create 1 MHz, then set LM5146QRGYTQ1 RT pin to 1.05 MHz so the PLL pulls it exactly. Place the clock trace on L2 between grounds and add 22 pF//1 kΩ RC at the SYNC pin to kill 400 ps jitter; otherwise sideband spurs at (2 MHz – 1 MHz) = 1 MHz will alias into the audio band and give 20 mV pk-pk beat on the 3.3 V rail. Validate with zero-span EMI receiver on 5 kHz RBW.
If I swap a LM5145 controller (no sync) for LM5146QRGYTQ1 in a 48 V → 5 V/3 A telecom design, what duty-cycle headroom risk appears at cold-start (−40 °C) and how do I guarantee 4.5 V output?
LM5146QRGYTQ1 spec max duty 99 %, but the 200 ns guaranteed off-time forces a minimum step-down ratio. At 100 kHz the theoretical duty is 89 %, leaving 110 ns off-time—below the 200 ns minimum. Choose 220 kHz (RT = 81 kΩ) to give 455 ns off-time and 89 % duty; verify the high-side driver bootstrap re-charges by adding a 0.1 µF/100 V ceramic from BST to SW within 5 mm of the IC. At −40 °C the BST diode Vf rises 0.2 V; compensate by lowering the 0.1 Ω gate resistor to 0 Ω and pick 40 V logic-level FETs with Vth <2 V to keep 5 V regulation when battery sags to 6 V during crank.
Can LM5146QRGYTQ1 survive an abrupt 150 V load-dump jump in 24 V vehicle supply, and what front-end network prevents false power-good latch-off?
LM5146QRGYTQ1 absolute max VIN is 100 V; 150 V will breach the device. Clamp with the TI reference design TVS: SMAJ58A (58 V breakdown) plus 10 Ω/2 W series resistance to limit surge current to <1 A. Add 100 µF/100 V low-ESR aluminium across VIN to hold supply below 75 V for 200 ms load-dump profile. Route the PWRGD pull-up to an ADC pin instead of direct logic; a 10 ms RC (10 kΩ/1 µF) masks the 50 µs TVS overshoot so the MCU does not shut the rail on transients. Verify by ISO 16750-2 pulse #2a test; this keeps LM5146QRGYTQ1 below 90 V and PWRGD valid.
I want to parallel two LM5146QRGYTQ1 phases for 7 A on a 48 V forklift rail; what current-sharing mismatch can I expect and which cheaper alternate single-chip solution removes the risk?
LM5146QRGYTQ1 has no phase-shift or current-share pin; paralleling forces independent voltage loops. With 1 % FB resistors expect ±5 % current imbalance (0.35 A) and hot-spot one FET at 4 A. Add 10 mΩ ballast resistors in series with each output; loss rises 0.5 W (1 % efficiency hit). Safer: replace both ICs with one LM5119QRGYTQ1 dual-phase controller—integrated 180° phase interleave and current-share control achieves <3 % mismatch, cuts input capacitance in half, and saves 20 mm² board area for the same 7 A at only $0.60 extra compared to two LM5146QRGYTQ1 devices plus MOSFETs.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM5146QRGYTQ1 CAD Models
Texas Instruments LM5146QRGYTQ1 PCB symbols & footprints
productDetail
