Exposed Pad

Connect to GND

5

SS

6

FB

3

EN

1

VIN

2

RON

4

GND

7

VOUT

Enable

LMZ14203EXT

LMZ14203EXT

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SNVS666E – JUNE 2010 – REVISED APRIL 2013

Simplified Application Schematic

Connection Diagram

Figure 2. Top View

7-Lead PFM

PIN DESCRIPTIONS

Pin

Name

Description

1

VIN

Supply input — Nominal operating range is 6V to 42V . A small amount of internal capacitance is contained within the

package assembly. Additional external input capacitance is required between this pin and exposed pad.

2

RON

25k to 124k ohms.

3

EN

Enable — Input to the precision enable comparator. Rising threshold is 1.18V nominal; 90 mV hysteresis nominal.

Maximum recommended input level is 6.5V.

4

GND

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

5

SS

Soft-Start — An internal 8 µA current source charges an external capacitor to produce the soft-start function. This node is

discharged at 200 µA during disable, over-current, thermal shutdown and internal UVLO conditions.

6

FB

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

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

voltage.

7

VOUT

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

EP

EP

Exposed Pad — Internally connected to pin 4. Used to dissipate heat from the package during operation. Must be

electrically connected to pin 4 external to the package.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Copyright © 2010–2013, Texas Instruments Incorporated

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