EN5311 datasheet(2/16 Pages) ENPIRION

2 / 16 page

03799

11/24/2009

Rev:B

EN5311QI

www.enpirion.com

Pin Description

VIN

(Pin 1,2): Input voltage pin.

Supplies

power to the IC.

Input GND

: (Pin 3): Input power ground.

Connect this pin to the ground terminal of the

input

capacitor.

Refer

Layout

Recommendations for further details.

Output GND

: (Pin 4): Power ground.

The

output filter capacitor should be connected

between this pin and VOUT. Refer to Layout

recommendations for further detail.

VOUT

(Pin 5,6,7): Regulated output voltage.

(Pin 8,9,10,11,12,13,14): These pins

should not be electrically connected to each

other or to any external signal, voltage, or

ground. One or more of these pins may be

connected internally.

VSENSE

(Pin 15):

Sense pin for output

voltage regulation.

Connect VSENSE to the

output voltage rail as close to the terminal of

the output filter capacitor as possible.

VFB

(Pin 16): Feed back pin for external

divider option. When using the external divider

option (VS0=VS1=VS2= high) connect this pin

to the center of the external divider. Set the

divider such that VFB = 0.603V.

VS0,VS1,VS2

(Pin 17,18,19): Output voltage

select. VS0=pin19, VS1=pin18, VS2=pin17.

Selects one of seven preset output voltages or

choose external divider by connecting pins to

logic high or low. Logic low is defined as VLOW

≤ 0.4V. Logic high is defined as VHIGH ≥ 1.4V.

Any level between these two values is

indeterminate.

ENABLE

(Pin 20): Output enable. Enable =

logic high, disable = logic low. Logic low is

defined as VLOW ≤ 0.2V. Logic high is defined

as VHIGH ≥ 1.4V. Any level between these two

values is indeterminate.

Bottom Thermal Pad

: Device thermal pad to

remove heat from package. Connect to PCB

surface ground pad and PCB internal ground

plane (see layout recommendations).

Figure 2. Pin description, top view.

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