MAX17290 and MAX17292 PWM Controllers with Low Current of Shutdown (ART331E)

In critical applications such as regulation of distributed power supplies, offline, telecom applications and others, PWM boost controllers are vitally important in a project. MAXIM has two regulators for this purpose with low shutdown current and reduced EMI characteristics which must be analyzed when performing a project.

In this article we focus on two new Maxim components available by Mouser Electronics which are of great importance for projects that require boost converters with special features.

We are talking about MAX17290 and MAX17292 from Maxim which have a shutdown current of only 4 uA and can operate at 2.5 to 36 V voltages at 2.5 MHz.

The input voltage range of these integrated circuits ranges from 4.5 to 35 V and the transient protection voltage is 45 V.

The different versions of these components offer additional functions such as synchronization output for 180-phase out-of-phase operation, overvoltage protection using separate input (OVP), and a reference input pin to enable voltage adjustment features.

The new components are available in 12-pin TQFN (casing measuring 3 x 3 mm) and also in 10-pin uMAX housings.

In Figure 1 below we have a typical application circuit suggested by Maxim.

 

Figure 1 - Application circuit
Figure 1 - Application circuit

 

 

Highlights for this component are:

 

- All Capacitors used can be ceramic.

- Frequencies range from 100 kHz to 1 MHz for the MAX17290 and from 1 MHz to 2.5 MHz for the MAX17292 with external synchronization.

- Efficiency is greater than 90% reducing dissipation

- Reduction of EMI by scattered spectrum control

 

The current in normal operation is 0.75 mA (tip) and in the shutdown condition of 4 uA (tip).

In the graphs in Figure 2 we have some important features of these components obtained from Maxim's own datasheet.

 

Figure 2 - Typical operating characteristics
Figure 2 - Typical operating characteristics

 

 

The package is shown in Figure 3.

 

Figure 3 - Arrangements of pins

 


 

 

 

Finally, in Figure 4 we have the functional diagram of these components.

 

 

Figure 4
Figure 4

 

 

The detailed description of the component can be accessed at:

http://www.mouser.com/ds/2/256/MAX17290-MAX17292-1079790.pdf 

 

In the datasheet, information about the component calculation according to the application and, in addition, project suggestions are given.

To purchase from Mouser Electronics, go to the link:

http://www.mouser.com/Search/Refine.aspx?Keyword=MAX17290 

On this page you will also find a kit for the development and evaluation of these components.