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MAX15041 低成本、3A、4.5V至28V输入、350

2009-08-22 00:00:00

MAX15041 低成本、3A、4.5V至28V输入、350kHz PWM降压型DC-DC调节器

The MAX15041 low-cost, synchronous DC-DC converter with internal switches delivers an output current up to 3A. The MAX15041 operates from an input voltage of 4.5V to 28V and provides an adjustable output voltage from 0.6V to 90% of V_IN, set with two external resistors. The MAX15041 is ideal for distributed power systems, preregulation, set-top box, television, and other consumer applications.

The MAX15041 features a peak-current-mode PWM controller with internally fixed 350kHz switching frequency and a 90% maximum duty cycle. The current-mode control architecture simplifies compensation design, and ensures a cycle-by-cycle current limit and fast response to line and load transients. A high-gain transconductance error amplifier allows flexibility in setting the external compensation by using a type III compensation scheme, thereby allowing the use of all ceramic capacitors.

This synchronous buck regulator features internal MOSFETs that provide better efficiency than asynchronous solutions, while simplifying the design relative to discrete controller solutions. In addition to simplifying the design, the integrated MOSFETs minimize EMI, reduce board space, and provide higher reliability by minimizing the number of external components.

The MAX15041 also features thermal shutdown and overcurrent protection (high-side sourcing and low-side sinking), and an internal 5V, LDO with undervoltage lockout. In addition, this device ensures safe startup when powering into a prebiased output.

Other features include an externally adjustable soft-start that gradually ramps up the output voltage and reduces inrush current. Independent enable control and power-good signals allow for flexible power sequencing.

The MAX15041 is available in a space-saving, high-power, 3mm x 3mm, 16-pin TQFN-EP package and is fully specified from -40°C to +85°C.

Up to 3A of Continuous Output Current

±1% Output Accuracy Over Temperature

4.5V to 28V Input Voltage Range

Adjustable Output Voltage Range from 0.606V to 0.9 x V_IN

Internal 170mΩ R_DS-ON High-Side and 105mΩ R_DS-ON Low-Side Power Switches

Fixed 350kHz Switching Frequency

Up to 93% Efficiency

Cycle-By-Cycle Overcurrent Protection

Programmable Soft-Start

Stable with Low-ESR Ceramic Output Capacitors

Safe Startup into Prebiased Output

Enable Input and Power-Good Output