Hi davout,
We a component smart-tooltip which in in your case could be very useful.
Also I have created a little code snippet on how to use it with smart-button component:
//In your app.compoent.html:

<smart-button #button id="button"
              class="btn btn-1 btn-sep icon-info">
<smart-tooltip #tooltip id="tooltip"
                This is a tooltip for smartButton

And in your app.module.ts file:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ButtonModule } from 'smart-webcomponents-angular/button';
import { TooltipModule } from 'smart-webcomponents-angular/tooltip';
import { AppComponent } from './app.component';
    declarations: [ AppComponent ],
    imports: [ BrowserModule, ButtonModule, TooltipModule ],
    bootstrap: [ AppComponent ],
	entryComponents: [ AppComponent ]
export class AppModule { }

Also you can check the demos regarding the tooltip:
Let me know if that works for you!
Please, do not hesitate to contact us if you have any additional questions.
Best regards,
Yavor Dashev
Smart UI Team