4

LMZ34202

SNVSAJ2 – MARCH 2016

www.ti.com

Product Folder Links: LMZ34202

Submit Documentation Feedback

Copyright © 2016, Texas Instruments Incorporated

Pin Functions (continued)

PIN

DESCRIPTION

NAME

NO.

PWRGD_PU

21

I

An internal 100 k pull-up resistor is connected between this pin and the PWRGD pin. If use of this

internal pull-up resistor is desired, connect this pin to an appropriate voltage source that is less than

or equal to 12 V. If unused, leave this pin floating.

RT

9

I

This pin is connected to internal frequency setting circuitry which sets the default switching

frequency to 500 kHz. An external resistor can be connected from this pin to AGND to adjust the

switching frequency. Refer to application section in datasheet.

RTSEL

10

I

This pin can be used to adjust the switching frequency to 1 MHz without the need for an external

resistor. Connect this pin to AGND to adjust the frequency to 1 MHz. Otherwise, leave this pin

floating.

SENSE+

22

I

Remote sense connection. This pin must be connected to VOUT at the load or at the device pins.

Connect the pin to VOUT at the load for improved regulation.

SS/TR

25

I

soft-start and tracking pin. Connecting an external capacitor to this pin adjusts the output voltage

soft-start ramp above its 4.1 ms default setting. A voltage applied to this pin allows for tracking and

sequencing control.

VADJ

24

I

Connecting a resistor between this pin and AGND adjusts the output voltage.

VBSEL

7

I

Selectable internal bias supply. For output voltages

≥ 4.5 V, connect this pin to VOUT. For output

voltages < 4.5 V, connect this pin to AGND.

VERSA-

COMP

23

I

Connects to internal compensation network. This pin can be left floating or connected to the VADJ

pin to select the proper compensation depending on the output voltage.

VOUT

13, 14, 15,

16, 17, 18,

43

O

Output voltage. These pins are connected to the internal output inductor. Connect these pins to the

output load and connect external bypass capacitors between these pins and PGND close to the

device.