PGND/EP

Connect to AGND

5

FB

6

SS/TRK

3

EN

1

VIN

2

SYNC

4

AGND

7

VOUT

LMZ22005

www.ti.com

SNVS686J – MARCH 2011 – REVISED AUGUST 2015

5 Pin Configuration and Functions

NDW Package

7-Pin

Top View

Pin Functions

PIN

TYPE

DESCRIPTION

NAME

NO.

AGND

4

Ground

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

EP/PGND.

EN

3

Analog

Enable — Input to the precision enable comparator. Rising threshold is 1.279 V typical. Once

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

programmable hysteresis.

FB

5

Analog

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

The regulation reference point is 0.796 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 4. Used to dissipate heat from the package during

operation. Must be electrically connected to pin 4 external to the package.

SS/TRK

6

Analog

Soft-Start/Track — 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.

SYNC

2

Analog

Sync Input — Apply a CMOS logic level square wave whose frequency is between 650 kHz and

950 kHz to synchronize the PWM operating frequency to an external frequency source. When

not using synchronization connect to ground. The module free running PWM frequency is 812

kHz (typical)

VIN

1

Power

Supply input — Nominal operating range is 6 V to 20 V. A small amount of internal capacitance

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

between this pin and exposed pad (PGND).

VOUT

7

Power

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

pin and exposed pad.

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