Calculation tool
Data sheet
LM25148
- Functional Safety-Capable
- Integrated EMI mitigation
- Selectable dual random spread spectrum (DRSS) feature for enhanced EMI performance across low and high-frequency bands
- Optimized for CISPR 32 Class B requirements
- Versatile synchronous buck DC/DC controller
- Wide input voltage range of 3.5 V to 42 V
- 1% accurate, fixed 3.3-V, 5-V, 12-V, or adjustable output from 0.8 V to 36 V
- 150°C maximum junction temperature
- Lossless DCR or shunt current sensing
- Shutdown mode current: 2.3 µA
- No-load sleep current: 9.5 µA
- Internal 3-ms soft-start ramp
- Stackable up to two phases
- Advanced dropout with frequency foldback
- Internal bootstrap diode
- Switching frequency from 100 kHz to 2.2 MHz
- SYNC in and SYNC out capability
- Selectable PFM or FPWM modes
- Inherent protection features for robust design
- Internal hiccup mode overcurrent protection
- ENABLE and PGOOD functions
- VCC, VDDA, and gate-drive UVLO protection
- Internal or external loop compensation
- Thermal shutdown protection with hysteresis
- Create a custom design using the LM25148 with WEBENCH Power Designer
The LM25148 is a 42-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM25148 can be set up in interleaved mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.
The LM25148 has a unique EMI reduction feature known as dual random spread spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.
Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM25148 42-V Synchronous Buck DC/DC Controller with Ultra-Low IQ and Dual Random Spread Spectrum datasheet | PDF | HTML | 15 Dec 2021 |
| Application note | Power Supply Design for AMD Versal™ AI Edge Series | PDF | HTML | 29 Jan 2024 | |
| Application note | How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck | PDF | HTML | 16 Aug 2023 | |
| User guide | LM25149-Q1 EVM User's Guide (Rev. A) | PDF | HTML | 29 Apr 2022 | |
| Functional safety information | LM25148 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 07 Dec 2021 | |
| E-book | An Engineer’s Guide to Low EMI in DC/DC Regulators | 21 Apr 2021 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM25149-Q1EVM-2100 — LM25149-Q1 5.5-V to 36-V, low IQ, synchronous buck DC/DC controller evaluation module
The LM25149-Q1EVM-2100 high-density evaluation module (EVM) is designed to showcase the performance of the LM25149-Q1 high-performance, automotive synchronous buck DC/DC buck controller. It operates over a wide input voltage range of 5.5 V to 36 V to deliver a fixed 5-V output with better than 1% (...)
Evaluation board
LM5149-Q1EVM-400 — LM5149-Q1 evaluation module, 72-V, low-IQ, synchronous buck DC/DC controller with active EMI filter
The LM5149-Q1EVM-400 high-density evaluation module (EVM) is designed to showcase the performance of the LM5149-Q1 high-performance, automotive, synchronous buck DC/DC buck controller. The EVM operates over a wide input voltage range of 15 V to 72 V to deliver a fixed 12-V output with better than (...)
Calculation tool
LM5148-LM25148DESIGN-CALC — LM5148 and LM25148 controller quickstart design tool
Welcome to the quickstart design tool for the LM5148, LM5148-Q1, LM25148 and LM25148-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the above controller family. As such, the user can expeditiously arrive at an (...)
Reference designs
PMP31252 — 150W dual phase synchronous buck converter reference design for automotive applications
This design showcases a low EMI, dual-phase buck converter that can be used as a dual-output converter. As a dual-phase converter, the circuit can provide a continuous output current of 22A with 30A peak in a 12V to 5V configuration.
Test report: PDF
| Package | Pins | Download |
|---|---|---|
| VQFN (RGY) | 24 | View options |
Ordering & quality
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