1 Features

1• Input Voltage Range: 1.5 V to 6.0 V

• Adjustable Output Voltage:

– 0.55 V to 5.5 V

• Very Low Dropout:

– 225 mV (max) at 1 A (3.3 VOUT)

• High Output Accuracy:

– 0.7%, Typical

– 1%, Maximum Over Temperature (85°C)

• Open-Drain Power-Good Output

• Power-Good Rising Delay:

– TPS746: 165 μs

– TPS746B: 5 ms

• IQ: 25 μA (Typical)

• Built-In Soft-Start With Monotonic VOUT Rise

• Package:

– 2-mm × 2-mm 6-Pin WSON (DRV)

• Active Output Discharge

2 Applications

• Set-Top Boxes, Gaming Consoles

• Home Theater and Entertainment

• Desktops, Notebooks, Ultrabooks

• Printers

• Servers

• Thermostat and Lighting Controls

• Electronic Point of Sale (EPOS)

3 Description

The TPS746 is an adjustable 1-A low-dropout (LDO)

regulator with power-good functionality. This device is

available in a small, 6-pin, 2-mm × 2-mm WSON

package and consumes very low quiescent current

and provides fast line and load transient performance.

The TPS746 features an ultra-low dropout of 225 mV

at 1 A that can help improve the power efficiency of

the system.

The TPS746 is optimized for a wide variety of

applications by supporting an input voltage range

from 1.5 V to 6.0 V and an externally adjustable

output range of 0.55 V to 5.5 V. The low output

voltage enables this LDO to power the modern

microcontrollers with lower core voltages.

Additionally, the TPS746 has a low IQ with enable

functionality to minimize standby power. This device

features an internal soft-start to lower the inrush

current, which provides a controlled voltage to the

load and minimizes the input voltage drop during start

up.

The TPS746 has a power-good (PG) output that

monitors the voltage at the feedback pin to indicate

the status of the output voltage. The EN input and PG

output can be used for sequencing multiple power

sources in the system.

The TPS746 is stable with small ceramic output

capacitors, allowing for a small overall solution size.

A precision band-gap and error amplifier provides a

high accuracy of 0.7% max at 25ºC and 1% max over

temperature (85ºC). This device includes integrated

thermal shutdown, current limit, and undervoltage

lockout (UVLO) features. The TPS746 has an internal

foldback current limit that helps reduce the thermal

dissipation during short-circuit events.