PGND/EP

Connect to AGND

5

AGND

6

AGND

3

SYNC

1

VIN

2

VIN

4

EN

7

FB

SS

9

SH

10

VOUT

11

VOUT

8

LMZ23610

www.ti.com

SNVS707C – MARCH 2011 – REVISED MAY 2011

Connection Diagram

Figure 4. Top View

11-Lead PFM

PIN DESCRIPTIONS

Pin

Name

Description

1, 2

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 PGND.

3

SYNC

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.

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 Design Steps for the LMZ23610

Application section.

9

SH

Share pin. Connect this to the share pin of other LMZ23610 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 Design Steps for the

LMZ23610 Application 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.

Copyright © 2011, Texas Instruments Incorporated

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