LMZ34202 Datasheet, PDF (4/31 Pages) Texas Instruments – SIMPLE SWITCHER 4.5-V to 42-V Input, 2-A Power Module

LMZ34202
SNVSAJ2 – MARCH 2016
www.ti.com
Pin Functions (continued)
NAME
PIN
NO.
TYPE ⁽¹⁾
DESCRIPTION
PWRGD_PU
21
An internal 100 k pull-up resistor is connected between this pin and the PWRGD pin. If use of this
I
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.
This pin is connected to internal frequency setting circuitry which sets the default switching
RT
9
I
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
This pin can be used to adjust the switching frequency to 1 MHz without the need for an external
10
I
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
soft-start and tracking pin. Connecting an external capacitor to this pin adjusts the output voltage
25
I
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,
Output voltage. These pins are connected to the internal output inductor. Connect these pins to the
16, 17, 18,
O
output load and connect external bypass capacitors between these pins and PGND close to the
43
device.
4
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