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.