TPS62902-Q1 datasheet(13/54 Pages) TI

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8.3 Feature Description

8.3.1 Mode Selection and Device Configuration MODE/S-CONF

With MODE/S-CONF (SmartConfig), this device features an input with two functions. This pin can be used to

customize the device behavior in two ways:

• Select the device mode (Forced PWM or Auto PFM /PWM with AEE operation) with a HIGH-level or LOW-

level.

• Select the device configuration (switching frequency, internal or external feedback, output discharge, and

auto PFM/PWM mode) by connecting a single resistor to the MODE/S-CONF pin.

The TPS62902-Q1 interprets this pin during the start-up sequence after the internal OTP readout and before

the device starts switching in soft start (see Figure 8-1). If the device reads a HIGH-level or LOW-level, the

dynamic mode change is active and auto PFM/PWM or FPWM mode can be changed during operation. If the

TPS62902-Q1 reads a resistor value, the device is configured according to the resistance value in Table 8-1 and

there is no further interpretation during operation and device mode or other configurations can only be changed

by power cycling or disabling the device.

Note

The MODE/S-CONF pin must not be left floating. Connect the pin high, low, or to a resistor to

configure the device according to Table 8-1.

EN and UVLO

VOUT

Precise

Enable

detec on

OTP

Readout

S-CONF

Readout

VSET

Readout

So start

PG -> High

Switching

Opera on

No interpreta on of

MODE/S-CONF or VSET

Resistor-to-Digi al

readout and

interpreta on

MODE-Pin toggling detec on

Figure 8-1. Interpretation of S-CONF and VSET Flow

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TPS62902-Q1

SLVSG70 – APRIL 2023

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