TPSM843521 datasheet(4/41 Pages) TI2

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4 Pin Configuration and Functions

GND

VOUT

VIN

MODE

SS/PG

Figure 4-1. 9-Pin RCJ QFN-FCMOD, 3.3mm × 4.5mm Package (Top View)

Table 4-1. Pin Functions

TYPE(1)

DESCRIPTION

NAME

NO.

Enable input to the converter. Driving EN high or leaving this pin floating enables the

converter. An external resistor divider can be used to implement an adjustable VIN UVLO

function.

Output feedback input. Connect FB to the tap of an external resistor divider from the output

to GND to set output voltage.

GND

Ground pin. Connected to the source of the low-side FET as well as the ground pin for the

controller circuit. Connect to system ground and the ground side of CIN and COUT. The path

to CIN must be as short as possible.

VOUT

Output voltage. This pin is connected to the internal buck inductor. Connect the pin to the

output load and connect external output capacitors between this pin and GND.

Switching node. Do not place any external component on this pin or connect to any signal.

The amount of copper placed on this pin must be kept to a minimum to prevent issues with

noise and EMI.

VIN

Supply input pin to internal LDO and high-side FET. Input bypass capacitors must be directly

connected to this pin and GND.

MODE

Mode selection pin in light load condition and Power-Good / Soft-Start function. See Mode

Selection for details.

SS/PG

This pin can be a soft-start function or Power-Good function depending on the mode pin

configuration. If the soft-start function is selected, an external capacitor connected from

this pin to GND defines the rise time for the internal reference voltage. If the Power-Good

function is selected, this pin is an open drain power-good indicator, which is asserted low

if output voltage is out of PG threshold, overvoltage, or if the device is under thermal

shutdown, EN shutdown, or during soft start.

RT/SYNC

Frequency select and external clock synchronization. A resistor to ground sets the switching

frequency of the device. An external clock can also be applied to this pin to synchronize the

switching frequency. See Switching Frequency Selection, Synchronization for details.

(1)

A = Analog, P = Power, G = Ground

TPSM843521

SLUSG64 – APRIL 2025

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