LM2734XQMK Texas Instruments In Stock
LM2734XQMK is a 42 V, 1.5 A step-down (buck) DC/DC regulator by Texas Instruments with a 3 MHz switching frequency. Key specs: 4.5 V to 42 V input, adjustable output down to 1.285 V, SOT-23-5 package with integrated high-side MOSFET. From competitive pricing, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM2734XQMK?
- Wide 4.5 V to 42 V input voltage range for industrial and automotive compatibility
- Up to 1.5 A continuous output current with integrated high-side MOSFET switch
- High 3 MHz switching frequency reduces external component size and BOM cost
- SOT-23-5 package enables ultra-compact PCB footprint for space-constrained designs
- Adjustable output voltage from 1.285 V with ±2% feedback voltage accuracy
What is LM2734XQMK used for?
LM2734XQMK is widely used in industrial power supplies and distributed point-of-load conversion systems where a wide input range of 4.5 V to 42 V is required. Its 3 MHz switching frequency and 1.5 A output make it suitable for powering FPGAs, microcontrollers, and analog ICs in automotive infotainment and telematics modules. The compact SOT-23-5 package also fits IoT sensor nodes and portable instrumentation requiring efficient 12 V or 24 V bus regulation in tight board spaces.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
What are equivalent replacements for LM2734XQMK?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the maximum input voltage the LM2734XQMK can handle in a 24 V industrial bus application?
The LM2734XQMK supports an input voltage range of 4.5 V to 42 V, making it suitable for 12 V, 24 V, and even 36 V industrial bus systems with adequate transient headroom. This wide range allows designers to accommodate input voltage spikes and load-dump events common in industrial and automotive environments without additional clamping components.
How does the 3 MHz switching frequency of LM2734XQMK affect inductor and capacitor selection?
Operating at 3 MHz allows the LM2734XQMK to use very small inductors — typically 2.2 µH to 10 µH — and low-capacitance output capacitors in the range of 10 µF to 22 µF. This reduces overall solution size significantly compared to 400 kHz regulators, enabling a tight PCB footprint in the SOT-23-5 package without sacrificing output ripple performance.
When is LM2734XQMK a better choice than a lower-frequency buck converter for a 5 V to 1.8 V conversion at 1 A?
At 1 A output and 1.8 V target from a 5 V rail, the LM2734XQMK's 3 MHz operation means you can use a 2.2 µH inductor versus a 22 µH part needed at 300 kHz, saving significant board area. It is preferred when PCB space is below 25 mm² or BOM passives cost must be minimized, trading slightly higher switching losses for smaller magnetics and filter capacitors.
What output voltage range can be programmed using the feedback resistor divider on LM2734XQMK?
The LM2734XQMK features an internal reference of 1.285 V, and the output voltage is set by an external resistor divider. The output can be adjusted from 1.285 V up to approximately 38 V, limited by the 42 V input maximum and switch duty-cycle constraints. This flexibility lets engineers target common rails such as 1.8 V, 2.5 V, 3.3 V, 5 V, and 12 V with simple resistor changes.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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