LMZ23608

SNVS708D – MARCH 2011 – REVISED OCTOBER 2011

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Pin Descriptions (continued)

Pin

Name

Description

4

EN

Enable — Input to the precision enable comparator. Rising threshold is 1.274V typical. Once the module is enabled, a 20

uA source current is internally activated to accommodate programmable hysteresis.

5, 6

AGND

Analog Ground — Reference point for all stated voltages. Must be externally connected to EP/PGND.

7

FB

Feedback — Internally connected to the regulation, over-voltage, and short-circuit comparators. The regulation reference

point is 0.8V at this input pin. Connect the feedback resistor divider between the output and AGND to set the output

voltage.

8

SS

Soft-Start/Track input — To extend the 1.6 mSec internal soft-start connect an external soft start capacitor. For tracking

connect to an external resistive divider connected to a higher priority supply rail. See applications section.

9

SH

Share pin. Connect this to the share pin of other LMZ23608 modules to share the load between the devices. One device

should be configured as the master by connecting the FB normally. All other devices should be configured as slaves by

leaving their respective FB pins floating. Leave this pin floating if not used, do not ground. See applications section.

10,

VOUT

Output Voltage — Output from the internal inductor. Connect the output capacitor between this pin and PGND.

11

EP

PGND

Exposed Pad / Power Ground Electrical path for the power circuits within the module. — NOT Internally connected to

AGND / pin 5. Used to dissipate heat from the package during operation. Must be electrically connected to pin 5 external

to the package.

Absolute Maximum Ratings

(1)

VIN to PGND

-0.3V to 40V

EN, SYNC to AGND

-0.3V to 5.5V

SS, FB, SH to AGND

-0.3V to 2.5V

AGND to PGND

-0.3V to 0.3V

Junction Temperature

150°C

Storage Temperature Range

-65°C to 150°C

± 2 kV

For soldering specifications:

see product folder at www.national.com andwww.national.com/ms/MS/MS-SOLDERING.pdf

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

(2)

The human body model is a 100pF capacitor discharged through a 1.5 k

Ω resistor into each pin. Test method is per JESD-22-114.

Operating Ratings

(1)

VIN

6V to 36V

EN, SYNC

0V to 5.0V

Operation Junction Temperature

−40°C to 125°C

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

4

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