Datasheet

PGND/EP

Connect to AGND

SS/TRK

VIN

SYNC

AGND

VOUT

LMZ23605

www.ti.com

SNVS659H –MARCH 2011–REVISED OCTOBER 2013

Connection Diagram

Figure 2. Top View – 7-Lead PFM

PIN DESCRIPTIONS

Pin Name Description

1 VIN Supply input — Nominal operating range is 6V to 36V . 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).

2 SYNC 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 (Typ).

3 EN Enable — Input to the precision enable comparator. Rising threshold is 1.279V typical. Once the module is enabled, a

21 uA source current is internally activated to facilitate programmable hysteresis.

4 AGND Analog Ground — Reference point for all stated voltages. Must be externally connected to PGND (EP).

5 FB Feedback — Internally connected to the regulation amplifier, over-voltage comparators. The regulation reference point is

0.796V at this input pin. Connect the feedback resistor divider between the output and AGND to set the output voltage.

6 SS/TRK Soft-Start/Track — 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 DESIGN STEPS FOR THE

LMZ23605 APPLICATION section

7 VOUT Output Voltage — Output from the internal inductor. Connect the output capacitor between this pin and exposed pad.

EP PGND 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.

Product Folder Links: LMZ23605