LM25149RGYR
Active42-V SYNCHRONOUS BUCK DC/DC CONTROLLER WITH ULTRA-LOW IQ AND INTEGRATED ACTIVE EMI FILTER
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LM25149RGYR
Active42-V SYNCHRONOUS BUCK DC/DC CONTROLLER WITH ULTRA-LOW IQ AND INTEGRATED ACTIVE EMI FILTER
Technical Specifications
Parameters and characteristics for this part
| Specification | LM25149RGYR |
|---|---|
| Clock Sync | True |
| Control Features | Enable, Power Good, Frequency Control, Current Limit, Sync, Ramp, Soft Start |
| Duty Cycle (Max) [Max] | 100 % |
| Frequency - Switching [Max] | 2.2 MHz |
| Frequency - Switching [Min] | 100 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 150 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package / Case | 24-VFQFN Exposed Pad |
| Supplier Device Package | 24-VQFN |
| Supplier Device Package [x] | 5.5 |
| Supplier Device Package [y] | 3.5 |
| Synchronous Rectifier | True |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 42 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 3.5 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 4.52 | |
| 10 | $ 3.00 | |||
| 25 | $ 2.60 | |||
| 100 | $ 2.16 | |||
| 250 | $ 1.94 | |||
| 500 | $ 1.81 | |||
| 1000 | $ 1.70 | |||
| Digi-Reel® | 1 | $ 4.52 | ||
| 10 | $ 3.00 | |||
| 25 | $ 2.60 | |||
| 100 | $ 2.16 | |||
| 250 | $ 1.94 | |||
| 500 | $ 1.81 | |||
| 1000 | $ 1.70 | |||
| Tape & Reel (TR) | 3000 | $ 1.56 | ||
| 6000 | $ 1.50 | |||
| Texas Instruments | LARGE T&R | 1 | $ 2.43 | |
| 100 | $ 2.13 | |||
| 250 | $ 1.49 | |||
| 1000 | $ 1.20 | |||
Description
General part information
LM25149 Series
The LM25149 is a 42-V, ultra-low IQsynchronous 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 LM25149 can be set up in interleaved dual-phase mode with accurate current sharing for high-current applications. It can operate with VINas low as 3.5 V, at nearly 100% duty cycle if needed.
The LM25149 has two unique EMI reduction features: active EMI filter and dual random spread spectrum (DRSS). The active EMI filter senses any noise or ripple voltage on the DC input bus and injects an out-of-phase cancellation signal to reduce the disturbance. DRSS combines low-frequency triangular and high-frequency randomized modulations to mitigate EMI across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.
Additional features of the LM25149 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator and bootstrap diode, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.
Documents
Technical documentation and resources
