1 Features

• Input voltage range: 2.5V to 40V

• Available output voltage options:

– Fixed: 1.2V to 12V

– Adjustable: 1.205V to VIN − VDO

• Output current: 150mA

• Ultra-low IQ: 1.8μA at IOUT = 0mA

• Stable with output capacitors ≥ 1.0μF

• High PSRR:

– 70dB at 1kHz

– 43dB at 100kHz

• Fold-back current limiting

• Overtemperature protection

• Package:

– 5-pin SOT-23 (DBV)

• Operating junction temperature: –40°C to +125°C

2 Applications

• Appliances

• Home and building automation

• Retail automation and payment

• Grid infrastructure

• Medical applications

• Lighting applications

3 Description

The TPS7B91 low-dropout (LDO) linear voltage

regulator is a low quiescent current device. The

TPS7B91 offers a wide input voltage range (up to

40V), wide output range, and low-power operation in

miniaturized packaging. The wide output range is up

to VIN − VDO for the adjustable configuration or up to

12V for the fixed configuration.

The TPS7B91 is optimized to power microcontrollers

and other low power loads for battery-powered

applications. The TPS7B91 is stable with a output

capacitor range of 1.0μF to 47μF.

The TPS7B91 low quiescent current (1.8μA typically)

makes this device designed for battery-powered or

always-on systems that require very little idle-state

power dissipation.

The TPS7B91 LDO supports a low dropout of typically

900mV at 150mA of load current. The TPS7B91

also features an internal soft-start to lower the

inrush current during start-up. The built-in fold-back

overcurrent limit protection and thermal shutdown

helps protect the regulator in the event of a load short

or fault condition.

The TPS7B91 is available in a 2.9mm × 2.8mm, 5-

pin SOT-23 (DBV) package for fixed and adjustable

outputs.