LMZ23608 datasheet(3/37 Pages) TI2

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PGND/EP

Connect to AGND

AGND

SYNC

VIN

VOUT

LMZ23608

www.ti.com

SNVS708G – MARCH 2011 – REVISED AUGUST 2015

5 Pin Configuration and Functions

NDY Package

11-Pin

Top View

Pin Functions

I/O

DESCRIPTION

NAME

NO.

AGND

Ground

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

EP/PGND.

Analog

Enable — Input to the precision enable comparator. Rising threshold is 1.274 V typical. Once the

module is enabled, a 20-µA source current is internally activated to accommodate programmable

hysteresis.

Analog

Feedback — Internally connected to the regulation, overvoltage, and short circuit comparators. The

regulation reference point is 0.8 V at this input pin. Connect the feedback resistor divider between

the output and AGND to set the output voltage.

PGND

—

Ground

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.

Analog

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

devices. One device must be configured as the master by connecting the FB normally. All other

devices must be configured as slaves by leaving their respective FB pins floating. Leave this pin

floating if not used, do not ground. See Design Steps section.

Analog

Soft-Start/Track input — To extend the 1.6-ms 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 Design Steps section.

SYNC

Analog

Sync Input — Apply a CMOS logic level square wave whose frequency is between 350 kHz and

600 kHz to synchronize the PWM operating frequency to an external frequency source. When not

using synchronization this pin must be tied to ground. The module free running PWM frequency is

350 kHz.

VOUT

Power

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

and PGND.

VIN

Power

Supply input — Nominal operating range is 6 V to 36 V. A small amount of internal capacitance is

contained within the package assembly. Additional external input capacitance is required between

this pin and PGND.

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