1 Features
1• –40°C to +125°C Ambient Operating Temperature
Range
• An AEC-Q100 Qualified Device is Available
• VIN 3.8 V to 45 V (47 V Absolute Maximum)
• Output: Fixed 3.3 V, 5 V, or Adjustable From
1.5 V - 15 V with ±0.8% Accuracy
• Fixed 2.2 MHz or 440 kHz Switching Frequency
with ±5% Accuracy
• High-Side and Low-Side Gate Drive With Slew
Rate Control
• Optional Frequency Shift by Varying an Analog
Voltage or RT Resistor
• Optional Synchronization to an External Clock
• Optional Spread Spectrum
• Shutdown Mode IQ: 10 μA Typical
• Low Standby Mode IQ: 35 μA Typical
• 75 mV Current Limit Threshold with ±0.9%
Accuracy
• External Resistor or DCR Current Sensing
• Output Enable Logic Input
• Hiccup Mode for Sustained Overload
• Power Good Indication Output
• Selectable Diode Emulation or Forced Pulse
Width Modulation
• QFN-24 Package with Wettable Flanks
• Create a Custom Design Using the LM25141 With
the WEBENCH® Power Designer

2 Applications
• Medical Equipment
• Industrial Programmable Logic Controller
• Industrial PC
• Embedded PC

3 Description
The LM25141 is a synchronous buck controller,
intended for high voltage wide VIN step-down
converter applications. The control method is peak
current mode control. Current mode control provides
inherent line feed-forward, cycle-by-cycle current
limiting, and ease of loop compensation. The
LM25141 features slew rate control to simplify the
compliance with EMI requirements.
The LM25141 has two selectable switching
frequencies: 2.2 MHz and 440 kHz. Gate Drivers with
slew rate control that can be adjusted to reduce EMI.
In light or no-load conditions, the LM25141 operates
in skip cycle mode for improved low power efficiency.
The LM25141 has a high voltage bias regulator with
automatic switch-over to an external bias to reduce
the IQ current from VIN. Additional features include
frequency synchronization, cycle-by-cycle current
limit, hiccup mode fault protection for sustained
overload, and power good output.