Data Sheet

4

Rev. 1.1, 2011-07-08

IFX91041

Pin Configuration

3

Pin Configuration

3.1

Pin Assignment

Figure 2

Pin Configuration

3.2

Pin Definitions and Functions

Pin

Symbol Function

1SYNC

Synchronization Input.

Connect to an external clock signal in order to synchronize/adjust the switching frequency.

If not used connect to GND.

2GND

Ground.

3

Frequency compensation for regulation loop stability.

Connect to compensation RC-network.

4FB

Feedback Input.

For the adjustable output voltage versions (IFX91041EJV) connect via voltage divider to output

capacitor.

For the fixed voltage version (IFX91041EJV50, IFX91041EJV33) connect this pin directly to the

output capacitor.

5BDS

Buck Driver Supply Input.

Connect the bootstrap capacitor between this pin and pin BUO.

6BUO

Buck Switch Output.

Source of the integrated power-DMOS transistor. Connect directly to the cathode of the catch

diode and the buck circuit inductance.

7EN

Enable Input.

Active-high enable input with integrated pull down resistor.

8VS

Supply Voltage Input.

Connect to supply voltage source.

Exposed Pad

Connect to heatsink area and GND by low inductance wiring.

GND

EN

COMP

BUO

VS

5

6

4

3

2

7

1

8

FB

IFX91041

SYNC

BDS

S08_PIN.vsd